The Zhaotong Native Copper Deposit Associated with the Permian Emeishan Flood Basalts, Yunnan, Southwest China

Autor:	John Malpas, Zhengwei Zhang, Hongguang Gao, Christina Yan Wang, Liang Qi, Shuguang Hou, Mie-Fu Zhou
Rok vydání:	2006
Předmět:	Basalt Native copper chemistry Permian Lava Subaerial Breccia Geochemistry Flood basalt chemistry.chemical_element Geology Copper
Zdroj:	International Geology Review. 48:742-753
ISSN:	1938-2839 0020-6814
DOI:	10.2747/0020-6814.48.8.742
Popis:	The Zhaotong native copper deposit in Yunnan, Southwest China, is associated with the upper Middle Permian Emeishan flood basalts and is mainly hosted in the upper part of the Emeishan volcanic succession. Native copper mainly appears as disseminations in basaltic tuffs, and vesicular and brecciated tops of subaerial lava flows. Sheets of native copper up to 30 x 10 x 0.2 cm have also been found along fractures within the volcanic breccias. The native copper is associated with bitumen, zeolite, quartz, and calcite, typical of a low-temperature (100-150°C) hydrothermal alteration assemblage. The ore grades vary from ~0.1 to 20 wt% Cu. Copper was likely a result of organicinorganic interactions under conditions of the paucity of reduced S.
Databáze:	OpenAIRE
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