REE Geochemistry of Mayuan Pb-Zn Deposit on Northern Margin of Yangtze Plate
详细信息
- 责任者：Liu Shuwen (School of Earth Science and Resources ; Chang’an University ; Xi’an 710054 ; China) ; Shi Shun
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(5)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 稀土元素 ; rare earths ; 扬子板块 ; Yangtze Plate
- 页码：p.979-988
- 图表：4 illus., 2 tables, 32 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The newly-discovered Mayuan Pb-Zn deposit occurs in bedded and stratoid forms and lies in a structural zone of dolomite brecciasin the Sinian Dengying Formation on the northern margin of Yangtze craton.REE geochemistry of hydrothermal gangue minerals and sedimentary strata in the Mayuan Pb-Zn deposit was analyzed in this paper with the purpose of understanding comprehensively the source of ore materials.The North America shales-normalized REE patterns of hydrothermal gangue minerals and sedimentary strata are almost flat and assume linear distribution in Y-∑REE diagram,suggesting that ore-forming materials originated from sedimentary formations.The higher?REE and LREE-enriched REE patterns of the late-stage calcites relative to earlystage hydrothermal dolostone show that they were derived from fluids of different origins.The early-stage hydrothermal dolostone is similar to Sinian dolostone in?REE,REE patterns and the positions in Y-∑REE diagram,indicating that Dengying dolostone might have served as the main material source.The late-stage calcites have higher?REE values than Sinian dolomite and lower?REE values than basement and Paleozoic sedimentary strata,implying that the late-stage ore-forming fluid probably migrated through the basement and Paleozoic sedimentary strata.The positiveδEuNanomalies in hydrothermal gangue minerals show that the deposit was formed in a relatively high temperature(>200℃)and reductive environment.
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