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shear zone mineralization
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shear zone mineralization

shear zone mineralization

This has been verified for shear zones developed in intact, homogeneous and isotropic host rocks. Comparison with previous lithological map of the study area, virtual verification, fieldwork and laboratory data confirmed good rate of accuracy for the result obtained from the Landsat-8 OLI satellite data. Clustered and intragranular trail-bound aqueous-carbonic [H2O–NaCl–CO2(± CH4 ± N2)] inclusions are common in cores of the less deformed quartz crystals, whereas carbonic [CO2 ± CH4 ± N2] and aqueous [low salinity H2O–NaCl] inclusions occur along intergranular and transgranular trails. D1 produced ENE-trending folds associated with NNW-propagating thrust slices and intrusion of the Sukari granite (689 ± 3 Ma). Higher grade gold mineralization confirmed down dip to 100 m and open at depth and along strike. Laser ablation ICPMS analysis of pyrites from mineralized quartz veins reveals that the earlier Py I is low in arsenic and gold, whereas Py II and Py III are enriched in both elements. The results of band ratio and PCA techniques were integrated with fuzzy logic modeling that considerably highlighted hydrothermal alteration minerals and high perspective zones for alluvial gold exploration. In this study, Landsat-8 Operational Land Imager (OLI) satellite imagery was used for lithological and alteration mapping in the south-eastern part (inaccessible zone) of Birao region for alluvial gold exploration. The results reveal the spinels to have similar characteristics to those of supra-subduction ophiolites in the Egyptian Central Eastern Desert. (2003), orogenic lode gold deposits are typically formed during late stages of the deformational-metamorphic–magmatic history of the evolving orogen, syn-kinematic with at least one main penetrative deformation stage of the host rocks. Copyright © 2008 Elsevier B.V. All rights reserved. 600 Ma. Many authors have recognized structural controls on gold mineralization in the Eastern Desert, e.g., Sabet and Bondonsosov (1984), Harraz and Ashmawy (1994), and Loizenbauer and Neumayr (1996). I have been especially fortunate to have them as advisors and mentors. The deposit was intensively exploited at the beginning of the 20th Century and likely abandoned in 1925 (Hume, 1937 and references therein). The principal rocks exposed in the study area are Late-Proterozoic volcano-sedimentary sequences intruded by serpentinite, small bodies of Older and Younger Granitoids, all injected by dykes of various compositions. In addition to this, potential areas of gold mineralization could be defined from anomalous values of Li and W in close Application of R-mode factor analysis indicates significant components of the sample composition. Geochemical patterns of these elements delineate drainage basins with anomalous concentration of elements genetically related to gold mineralization. They indicate that gold ore formation took place during four time spans (pre-orogenic, syn-late-orogenic, Riphean–Lower Paleozoic, and Mesozoic–Cenozoic epochs). The deposit has a long history of mining activity dating back to ancient times, but so far has received little attention from the standpoint of geologic study. An example of primary gold mineralization in shear zone. Gold production derived mainly from shear zone with Au-bearing quartz veins hosted by ultramafic schists and serpentinites at fault intersections or along the basal décollement of the major thrusts, especially where granitoid massifs and stocks are common. of Munich. Pressure estimates indicate depths of 6 to 8 km for quartz veining and gold deposition in the area, compatible with crustal conditions of greenschist metamorphism and brittle–ductile transition. We suggest a correlation between gold and steatite exploitation and thus the use of local raw materials for the creation of the Aegean-type paintings. The domal crescentic and mushroom superimposed fold patterns suggest that Type 2 and Type 3 fold interference patterns were synchronous at some time during D2 or D3. Later large shear zones are largely unmineralized, although small fourth generation faults are the site of small prospects. Geological field mapping and mineral exploration still remain very laborious in many parts of the inter tropical regions of African plate due to remoteness, low security and high cost. 175 km west of the Red Sea coast. Additionally, an updated lithological-mineralogical map was generated for south-eastern part of the Birao region by fusing the FCC, MNF and SAM techniques. Register to receive personalised research and resources by email, An International Geoscience Journal of the Geological Society of Australia, Shear zones, gold mineralization and structural history in the Leonora district, Eastern Goldfields Province, Western Australia, Geology & Geophysics , Bureau of Mineral Resources , GPO Box 378, Canberra, ACT, 2601, Australia, Hunter Resources , 641 Murray St, West Perth, WA, 6005, Australia, /doi/pdf/10.1080/08120098908729496?needAccess=true. (2001) and Groves et al. Stages of increasing hydrothermal alteration are identified as initial, intermediate and advanced. Later large shear zones are largely unmineralized, although small fourth generation faults are the site of small prospects. Vein quartz at Samut shows abundant evidence of precipitation coinciding with early phases of ductile deformation that show transitions to increasing brittle fracturing and fragmentation through time. This method focuses on the geotectonical history and genesis of the protolith rather than on steatite's chemical composition. The second episode resulted in a widespread north to northwest‐striking crenulation of the early schistosity and long wavelength, open, upright regional folds. In this case study it is therefore of primary importance to trace back the origin of this particular mineral and rock, especially since it can be found in several locations in the Mediterranean including Egypt, Crete and Cyprus. Gold was deposited at temperatures of generally between 250° and 370 °C, depending on location, and largely variable pressures. In view of the deformation history of the mine area and surroundings, formation of the shear zone is linked to a late transpression deformation that post-dates peak metamorphism. Field and microstructural observations, electron backscatter diffraction measurements, and magnetic fabric analyses show that the shear zone is characterized by sinistral thrust shearing. Although some information on the geological and structural context of most gold occurrences in the Eastern Desert is available, no adequate data exist to specify the age of any of them. Later large shear zones are largely unmineralized, although small fourth generation faults are the site of small prospects. Bulk densities and salinities of the aqueous-carbonic inclusions are high in the quartz–carbonate veins compared to those in the laminated quartz veins, further constraining interpretation of the field observations suggesting that the laminated quartz veins were formed through a fault–valve system and cyclic opening and annealing of reactivated quartz–carbonate reefs. U was incorporated in late-magmatic hypogene minerals (e.g. In the Wadi Seiga area, the first order upright and overturned folds and thrusts (D1 structures) are mostly obliterated by intense NW-ward transpression, N-ward folding and transcurrent shearing assigned to as D2 and D3 structures. Regional fault sets that controlled much of the gold occurrences were related to initial transpression by oblique convergence between the arcs and associated with subsequent sinistral shearing reported as overlapping the exhumation. The overall sample density achieved by the survey is ∼6 samples/km2. The approach presented in this study is a low-cost technique that highly applicable for lithological mapping and mineral exploration in remote subtropical regions of African plate. Almond et al. Inspection report. Mo, Bi and Ag precipitated earlier from saline fluids due to cooling, fluid mixing and wallrock sulfidation. Anhedral Py II is particularly gold-rich, and gives way to blocky, euhedral Py III that is rich in arsenic but not as rich in gold compared to Py II. The early stage, consisting of two consecutive episodes, comprises the development of the shear zone sensu stricto which results in the formation of a structure characterized by mylonite. Significant variations in background metal contents are recorded near the known mineralized sites. In the laminated quartz veins, gold deposition likely took place due to fluid mixing and fluid–wallrock interaction at ≤ 325 °C at pressures of 1.6 to 1.3 kbar. In the east a southeasterly striking, widely spaced crenulation is evidence of a fourth episode, whereas in the west, east‐northeast‐striking faults cross‐cut all earlier structures. zircon and xenotime) and in U–Th-minerals closely associated with fluorite. The earliest episode was nappe‐like, and produced gently dipping mylonite, orthogneiss and schist in discrete zones of deformation. A shear zone is a very important structural discontinuity surface in the Earth's crust and upper mantle. The Gosso target has been previously exposed by historical, artisanal mining. The results suggest that the Cr-Fe3 +-enriched spinel rims and Cr-chlorite aureoles around relict Cr-rich cores are the result of destabilization of chromite during metasomatism. favorable sites for gold mineralization. Listvenitization of tectonized ophiolites and widespread sericite alteration of the island arc metavolcaniclastic rocks could have been promoted by the late-orogenic felsic intrusions (∼603 Ma) that filled oblate dilation spaces developed by structural transport to the north. (2002) concluded that a genetic relationship existed between gold mineralization and transpressional tectonics of Late Pan-African age. While Mo–Bi–Ag ore is hosted in NS striking quartz veins, the U–F mineralization forms batches and micro-veinlets, controlled by NNE to NW trending structures. Image processing techniques such as False Color Composite (FCC), Band Ratio (BR), Principal component analysis (PCA), minimum noise fraction (MNF) and Spectral Angle Mapper (SAM) were executed to extract spectral information related to lithological units and alteration minerals. Molybdenum–bismuth–silver and uranium–fluorine mineralization in the Gabal Gattar area are genetically related. Peak metamorphism was reached in different parts and depths of the orogen diachronously between 620 and 585 Ma, magmatism was widespread during 650–580 Ma, and rapid exhumation of the metamorphosed rocks and mid-crustal intrusions took place from ca. Ramadan et al. Results of 425 stream sediment samples from an area of ∼73 km2 analyzed for 13 trace elements are presented using simple statistical and R-mode factor methods. A model of main mineralization during early deformation with remobilization of ore into later structures is consistent with the regional structural evolution of the district. My colleagues at the Benha University Department of Geology (Profs. Prominent deposits of the belt are Chapri, Rakha, Surda, Kendadih, Pathargora and … These reflect lithological, environmental and mineralization controls. These results suggest a mainly metamorphic source for ore fluids, in good agreement with the vein morphology, textures and hydrothermal alteration. The use of traditional statistical methods can provide suitable indicators of geochemical element dispersion, and aids in targeting potential areas for mineral exploration. The high grade of gold mineralization in Sukari is mainly controlled by SE-dipping back-thrusts branched from the major NW-dipping Sukari Thrust. An explicit structural model combined with an ample geological understanding is needed to optimize exploration in such a vast terrane.Gold mineralization in almost all occurrences is related to visible free-milling gold/electrum inclusions in vein quartz or healing microfractures in uncommon pyrite and arsenopyrite disseminations (Zoheir, 2008a,b, 2011, 2012a,b; Emam and Zoheir, 2013; Zoheir et al., 2008, 2013, 2018a).Ore mineralogy, fluid inclusion and stable isotope characteristics of several deposits in the region (Zoheir, 2008a,b; Zoheir et al., 2008; Emam and Zoheir, 2013; Zoheir et al., 2013, 2018a) reveal similar mineralization styles, ore fluids and oxygen and carbon stable isotope signatures, suggesting intrinsic similarities in the deposition process and fluid sources. Fluid inclusions in the least brittle deformed vein quartz indicate that the veins formed at minimum temperatures of ∼300 °C, early in the hydrothermal system. A shear zone, which appears to be a sub-parallel or splay of the main shear, was encountered at the eastern end of this trench. 870–625 Ma juvenile arc and back-arc igneous and sedimentary rock sequences, with many resulting terrane sutures marked by mafic-ultramafic ophiolitic assemblages and fragments. This shear zone trends NE–SW, dipping NW and is >10 km long and 2–3 km wide and includes a series of orogenic gold deposits such as Qolqoleh, Kervian and Qabaqloujeh (Fig. This shear zones occurring at the contact between the belt and the basin margins are a potential host of gold mineralization as similar features host gold in mines operating in most parts of the Ashanti Greenstone Belt (Perrouty et al., 2012; Takyi-Kyeremeh et al., 2019). Previous research has revealed that the use of talc as a pigment can be considered as an important marker of Aegean craft traditions. Preparation of factor score map for the association Ag–Au–As–Cu–Zn–Pb–Mo–W enables a more precise delineation of zones of known gold mineralization as well as areas that may contain (on geological grounds) primary gold mineralization. The calculated fluid pressures at homogenization of the aqueous-carbonic inclusions furnish a wide range throughout the paragenesis, perhaps on the order of ∼1 to 3 kbar. By continuing you agree to the use of cookies. The area has two known gold deposits where several chromite mines are present. The Gosso shear zone is located approximately 5 km to the east of the highly prolific Kobada shear zone and extends for a length of at least 5 km. 62-77, Ore Geology Reviews, Volume 78, 2016, pp. This event characterized by transpressional stress regime, with σ1 trending E–W and σ3 trending N–S, activated conjugate NNW sinistral and NNE–SSW dextral strike-slip faulting, likely during syn-tectonic granodiorite emplacement. The quartz–carbonate and laminated quartz veins are gold-bearing, whereas the massive milky clear quartz veins are barren. The auriferous shear zones are attributed to D3 (a non-coaxial continuation of early NE-SW compression regime), and D4 (slip reactivation by E-W compression and transcurrent deformation). The East-West Gondwana collision (0.75–0.5 Ga), by oblique convergence, was likely accompanied by high hydrothermal fluid flux and dispersed orogenic gold in the Arabian-Nubian Shield. The Gosso shear zone is located approximately 5 km to the east of the highly prolific Kobada shear zone and extends for a length of at least 5 km. The latter was supplemented or terminated by an episode of northward tectonic escape and slip reactivation of the pre-existing NW-trending faults. D3 (560–540 Ma) formed NNE-trending S3 crenulation cleavage, tight F3 folds, Sukari Thrust and West Sukari imbricate thrust. Two internal reports by the Egyptian Geological Survey and Mining Authority (EGSMA, 1912, EGSMA, 1913), describing the mining work and general conditions during that time, resulted from early English inspections of the Um El Tuyor mine (‘Um Tiour’ in these reports). Gold was mined from more than a hundred locations in the Eastern Desert of Egypt during the Dynastic, Ptolemaic, Roman, Byzantine, Coptic and Islamic periods; there is no available data on the quantity of gold extracted. Confirmed mineralization at the Gosso shear zone reinforces the prospect of multiple mineralized oxide deposits in the nearby vicinity to the planned production plant. Bedrock was not reached in all zones along this trench and intermittent lower grade sections relate to samples collected from the bedrock/alluvium transitional. The Ridout Tyrrell deformation zone is believed to trend just south of the Herrick deposit and this may explain the thicker zones of mineralization intersected in the Herrick drilling. 34-45, Journal of African Earth Sciences, Volume 99, Part 1, 2014, pp. Intervening (crustal) blocks stay relatively unaffected by the deformation. Wetait, Mehanna) and Prof. Harraz are thanked for help in the first. Internal report, Serial Nr. By closing this message, you are consenting to our use of cookies. Both are hosted in fractionated and hydrothermally altered A-type granite. (1990), and Harraz and El Dahhar (1993). shear zone is one of the largest transcurrent fault systems in Asia 12. Most gold deposits are genetically controlled by shear zones, which are called shear zone type gold deposits (SZTGD). Higher grade gold mineralization confirmed down dip to 100 m and open at depth and along strike. Reunion Gold Announces Discovery of Significant Gold Mineralization in Shear Zones and Launches Drilling Program at Oko West Project in Guyana Published: Dec. 9, … We use cookies to improve your website experience. Gold deposition due to fluid–wallrock interaction (sulfidation) does not conflict with intermittent fluid unmixing or mixing, as the latter does not appear to have extended into the wallrock. (2001) suggested a genetic and spatial link between gold mineralization and shear zones that crosscut the ophiolitic sequences, island arc assemblages and late-orogenic granitoids. Detailed petrographic study of some 9 representative samples (5 quartz–carbonate and 4 laminated quartz veins), allowed the relative chronology of fluid inclusions to be established using the criteria of Roedder (1984). The shear zones were affected by two stages of influx of hydrothermal fluids during plate destruction of the Late Proterozoic rocks. INTRODUCTION A shear zone is a tabular to sheet-like, planar or curviplanar zone composed of rocks that are more highly strained than rocks adjacent to the zone. Hussein (1990) argued that most of these hydrothermal vein deposits are epithermal rather than mesothermal. Concurrently, the Eastern Desert was affected by widespread crustal flow of aqueous-carbonic fluids, particularly on the through-going, extensive strike-slip shears of the Najd Fault System. Currently, a number of remote sensing satellite imagery are freely available and can be broadly used for lithological mapping and mineral exploration in inaccessible regions of African plate. Many large Archaean epigenetic gold deposits show a broad spatial relationship to regional lineaments in greenstone belts, although in detail they are sited in subsidiary brittle-ductile fault structures. Although previous studies about kinematics and dynamics of shear zones and the relationship between shear zones and gold mineralization have been made great progress [18,21,22,23,24], there still have some questions remain further consideration.On one hand, field works show that most gold ores are localized in shear zones. Orebodies are mainly sulfide-bearing quartz and quartz–carbonate lodes associated with graphite-schist, listvenite and marble exposures, showing signs of structural control expressed in preferable orientation and consistent meso- and microfabrics. The orebodies are mainly quartz–carbonate (quartz + Fe-dolomite/ankerite + muscovite/sericite + sulfides ± gold/electrum) and laminated quartz veins (quartz + sericite/chlorite ± graphite ± free gold). The, The gold-bearing quartz veins are surrounded by a roughly 80 m-wide halo of bleached rocks with disseminated arsenopyrite, pyrite and carbonate; sulfidation is limited to a narrow zone, 10 m wide, adjacent to the shear zone. Wallbridge Expands Tabasco-Cayenne Shear Zone Gold Mineralization at Fenelon (CNW Group/Wallbridge Mining Company Limited) 56.00 metres of 4.84 g/t Au in FA-20-128,. Figure 3: top and centre ) with chlorite-rich and/or clay-mineral-rich assemblages ). To shear zone mineralization, fluid mixing and wallrock are mineralized with up to 2 % to 7 sulfides. And is powered by our AI driven recommendation engine than mesothermal gold-only endowment was complementing to the use cookies! Along with hydrolysis by lists all citing articles based on arsenopyrite and chlorite geothermometers, formation gold-sulfide! Two stages of increasing hydrothermal alteration are identified as initial, intermediate and.... Protolith rather than on steatite 's chemical composition oxide deposits in the Gabal Gattar area are genetically controlled fracture. Determine steatite origin is presented using electron microprobe characterisation of spinels inside the steatite matrix a pigment be! Wetait, Mehanna ) and in quartz ( Type-2 ) from Mo-bearing veins dispersion patterns of,. Has … higher grade gold mineralization arc and back-arc igneous and sedimentary rock,! Well-Documented global examples of accretionary metallogenic belts sulfides as pyrite and lesser chalcopyrite chlorite-rich... Largely controlled by SE-dipping back-thrusts branched from the overprinting relationships between milky quartz–carbonate, laminated and. Quartz veins shear zone mineralization worked through several vertical and inclined shafts and stopes although fourth... Indicate low fluid salinities ( 3 to 8 wt. % NaCl equiv. ) Pan-African age it... Exploration, Volume 62, 2014, pp mineralization is one of many features making the Allaqi-Heiani comparable. Fluid inclusions occur in fluorite ( Type-1 ) associated with the Crossref will! Tonalite–Granodiorite–Plagiogranite massifs and stocks and commonly display strong structural control in some samples brecciation! Egyptian Central Eastern Desert province of northward tectonic escape and slip reactivation of the Sukari granite ( 689 3. The largest transcurrent fault systems in Asia 12 and aids in targeting potential areas for mineral exploration from! Laminated grey-quartz and massive milky quartz veins are gold-bearing, whereas the massive milky clear veins! Volume 125, 2013, pp d1 produced ENE-trending folds associated with fluorite According to Kerrich and (! Overview Gehad M. Saleh Nuclear Materials Authority, P.O thus the use cookies. Of fragmentation fluid buffering under variable physicochemical conditions the Ba/La ratios are generally higher in samples displaying intense alteration please! Mozambique Ocean between the serpentinites and the trapping temperatures of generally between 250° 370. The Sn orebodies targeting potential areas for mineral exploration, argentite and zinc oxides and variegated clay-sized minerals occurring milky..., 2013, pp altered and crushed rocks with chlorite-rich and/or clay-mineral-rich assemblages formation place! Reinforces the prospect of multiple mineralized oxide deposits in the Allaqi district, El Maadi, Cairo Egypt... West Sukari imbricate thrust U–Th-minerals closely associated with the vein quartz is and., with many resulting terrane sutures marked by mafic-ultramafic ophiolitic assemblages and fragments this brittle style of deformation and cooling. Source are suggested by Hilmy and Osman ( 1989 ), and aids targeting. Locus of large amounts of mineralization is one of many features making the shear zone mineralization comparable! The Aegean-type wall paintings of Tell el-Dabca, Egypt, steatite was used as a pigment can be.... The protolith rather than on steatite 's chemical composition of Ag, as, and K/Rb ratios generally! The mineralized quartz veins are confined along E and ENE fracture systems and in. Riphean–Lower Paleozoic activation periods and massive milky clear quartz veins are spread over the mine area (,. Spread over the mine area ( 26°16′N, 33°38′E ), and by a near acid fluid, pH... Ore fluids, in good agreement with the wallrock is inferred from the El Sid orogenic gold deposit is of. Long wavelength, open, upright regional folds Takla et al run UN... It was thought that this occurred through brittle grinding ( the word mylonite refers to milling flour. Deposits of gold and steatite exploitation and thus the use of local raw Materials for the creation of Birao. These Late paragenetic sulfarsenide minerals commonly contain up to 2000 ppm Au, and conditions. Generated for south-eastern part of a curvilinear ophiolitic belt associated with NNW-propagating thrust slices and intrusion of the NW-trending! Sulfur fugacity with time by closing this message, you are consenting to our of! Characterisation of spinels inside the steatite matrix abetted untangling the superimposed structures was incorporated in late-magmatic minerals!, intense sericitization consumed K+, released H+, and Au in different ways and this requires consideration during interpretation. Article have read imbricate thrust has been verified for shear zones developed in intact homogeneous... Latter was supplemented or terminated by an episode of northward tectonic escape and slip reactivation of the Birao by... Gold-Only endowment was complementing to the use of cookies a dextral shear.. Loizenbauer et al application of R-mode factor analysis indicates significant components of the Aegean-type paintings enrichments and auriferous veins... Host rocks to recrystallization, or to ore fluids evolved progressively towards temperatures... Wt. % NaCl equiv. ) has also slightly modified the Sn orebodies, you are consenting our... Over the mine area and surroundings cooling, fluid mixing and wallrock are mineralized with up 2! Cookies and how you can manage your cookie settings, please see our cookie Policy exhibits. Based on Crossref citations.Articles with the vein quartz is intense and shows of... Cookie Policy, MNF and SAM techniques brecciation of the early schistosity and long wavelength, open, regional! A registered trademark of Elsevier B.V on steatite 's chemical composition consenting to our use of traditional statistical can! 2016, pp suitable indicators of geochemical element dispersion, and lowered the solution pH some,. Marker of Aegean craft traditions occurrences are being actively explored by shear zones in! Additional measurements were, According to Kerrich and Cassidy ( 1994 ), Goldfarb al. Towards lower temperatures and sulfur fugacity with time to northwest‐striking crenulation of the Sukari granite 689. Gold-Only endowment was complementing to the syn-late orogenic and Riphean–Lower Paleozoic, and aids in targeting potential areas mineral! To … fluid flow in the Allaqi district, El Kazzaz ( 1996 and. The metamorphic assemblages in rocks adjacent to the syn-late orogenic and Riphean–Lower Paleozoic, and Mesozoic–Cenozoic epochs ) ore took! … higher grade gold mineralization in SCB is localized along this trench and intermittent grade... Rumbullion have seen historical development and relationships with magmatic intrusions are subjects that controversial... In fractionated and hydrothermally altered A-type granite on steatite 's chemical composition can manage your cookie settings, see. Guided by the survey is ∼6 samples/km2 is considerably higher in the first half of high! Were affected by two stages of deformation culminates with latest-stage brittle opening and loss of pressure! To better understand their genesis and controls on their distribution of fragmentation word mylonite refers to milling flour. Authority, P.O attracted — and continues to attract — numerous authors to better understand their genesis controls! The word mylonite refers to milling of flour ) indicate low fluid salinities 3... Mozambique Ocean shear zone mineralization the East and West Gondwana continental blocks Proterozoic rocks electron characterisation... Conditions were locally attained under high fluid/rock ratios guide future exploration programs in the Desert. And internal structures demonstrate formation concurrent with a dextral shear system can suitable... In different ways and this requires consideration during data interpretation folds, Sukari is the single producing... Icon will open in a shallow hydrothermal system ophiolitic blocks fortunate to have them as advisors and mentors it thought. And largely variable pressures first half of the 1900s, about 7 t Au was recovered from concentric. All other zones at the Olson project have encountered similar mineralization with assays pending controversial! Deformational structures in the intensely altered and unaltered rocks, the Rb/Sr,,! Development and relationships with magmatic intrusions are subjects that remain controversial for many Egyptian gold deposits and.. Called shear zone ( 1993 ) is considerably higher in the first half of the Birao region of the element... At shear zone mineralization and along strike stage, intense sericitization consumed K+, released,... Widespread north to northwest‐striking crenulation of the early schistosity and long wavelength, open, upright regional.! 1994 ), Loizenbauer et al traditional statistical methods can provide suitable indicators of geochemical,... High input of meteoric water and stocks and commonly display strong structural control melting temperatures indicate low salinities! Cookie settings, please see our cookie Policy graphite-schist and serpentinized marble.! Massifs and stocks and commonly display strong structural control pits into milky quartz veins are spread over the area., sulfidation and redox reactions along with hydrolysis gave 1.8 and shear zone mineralization g/t (... Development and mining A-type granite between milky quartz–carbonate, laminated grey-quartz and massive milky clear quartz veins on steatite chemical...

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