LLHR-type chalcopyrite Re-Os geochronology and geochemistry of the Xiaotongchang Cu deposit in south Ailaoshan and its geological significances

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dc.contributor.authorLi, W.
dc.contributor.authorGao, B.
dc.contributor.authorZhang, L.
dc.contributor.authorJin, X.
dc.contributor.authorSakyi, P.A.
dc.date.accessioned2019-05-31T14:38:20Z
dc.date.available2019-05-31T14:38:20Z
dc.date.issued2019-03
dc.description.abstractThe Xiaotongchang Cu deposit is located in the south Ailaoshan and at the contact between Yunnan province of China and Vietnam. Four Cu ore bodies are distributed parallel to each other in an interlayer fracture zone in the Permian Emeishan basalt. The major ore mineral in the deposit is chalcopyrite, and the main gangue minerals are quartz and calcite. New Re-Os data for chalcopyrite from the Xiaotongchang Cu deposit show tens of ppb Re abundances (1–86 ppb) and contain essentially no common Os. All the samples have extremely high 187Re/188Os (up to 2.3 × 104), and the dominance of radiogenic Os and high 187Re/188Os are diagnostic features of “LLHR” (low-level, highly radiogenic) sulfides. The Re-Os isochrone age for the No. 1 and No. 3 Cu bodies show that the phase of Cu mineralization predominantly occurred in the Middle Triassic, with an age of 230.6 ± 1.1 Ma. Thus, the mineralization occurred much later than the periods of major eruption of the Emeishan large igneous provinces, indicating a closer relationship with the late collisional processes in the Ailaoshan orogenic belt. Combined with REEs patterns and consistently positive δ34S values (7.4–9.2‰), it can be concluded that the ore-forming materials of the Cu deposit are derived from a mixture of mantle and crust components.en_US
dc.identifier.otherhttps://doi.org/10.1016/j.gexplo.2018.11.011
dc.identifier.otherVolume 198, Pages 123-131
dc.identifier.urihttp://ugspace.ug.edu.gh/handle/123456789/30452
dc.language.isoenen_US
dc.publisherJournal of Geochemical Explorationen_US
dc.subjectXiaotongchang Cu depositen_US
dc.subjectLLHRen_US
dc.subjectChalcopyriteen_US
dc.subjectRe-Os isotopic ageen_US
dc.subjectAilaoshan orogenic belten_US
dc.titleLLHR-type chalcopyrite Re-Os geochronology and geochemistry of the Xiaotongchang Cu deposit in south Ailaoshan and its geological significancesen_US
dc.typeArticleen_US

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