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Jilau |
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Tajikistan |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Jilau gold-quartz vein system in western Tajikistan falls within the southern Tien Shan metallogenic province of Central Asia, which hosts a number of important gold resources .
These gold deposits of the southern Tien Shan were formed during the late stages of continent-continent collision in association with subduction-related magmatism, metamorphism and continental margin deformation attributed to the Central Asian Hercynian Orogeny.
Jilau is hosted by a Hercynian syntectonic granitoid intrusive that was emplaced into bituminous dolomite country rocks. The economic mineralisation is associated with a dilational jog within a high-angle, oblique dextral-reverse slip shear zone that was undergoing brittle-ductile deformation.
The main orebody has the form of shear-zone subparallel quartz veins and lenses that emanate from a steeply plunging ore shoot of veins and stringers within a silicified and sulphidised granodiorite core. A second body comprises a reduced-style, auriferous scheelite skarn that developed adjacent to the stockwork in the contact aureole of the intrusion.
Gold occurs with scheelite and bismuth minerals, predominantly as inclusions in arsenopyrite in quartz veins and altered wall-rock. The gold is mainly associated with quartz containing fluid inclusions rich in methane. The correlation between high gold grades and high methane concentrations suggests that components of the mineralising fluids were derived from, or passed through, the reducing, carbonaceous rocks in the contact aureole of the intrusive. The occurrence of Au and W in an adjacent Hercynian skarn deposit and in the Jilau orebody, infers that the ore metals in both these systems were ultimately derived from a magmatic source.
Jilau contains approximately 100 tonnes of gold and has been dated at 299 Ma (Yakubchuk et al., 2002)
The most recent source geological information used to prepare this decription was dated: 2000.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Cole A, Wilkinson J J, Halls C and Serenko T J 2000 - Geological characteristics, tectonic setting and preliminary interpretations of the Jilau gold-quartz vein deposit, Tajikistan: in Mineralium Deposita v35 pp 600-618
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Yakubchuk, A.S., Cole, A., Seltmann, R. and Shatov, V., 2002 - Tectonic setting, characteristics and regional exploration criteria for gold mineralization in central Eurasia: The southern Tien Shan province as a key example: in Goldfarb, R. and Nielsen, R., (Eds.) Integrated Methods for Discovery: Global Exploration in Twenty-First Century; Econ. Geol. Special Publication No. 9 pp 177-201
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