Geochemistry Characteristics and Geological Significance of the Himalayan Period Granit-Porphyry in the Zaduo Region
详细信息
- 责任者：Fu Jun (Qinghai Institute of Geological Survey ; Key Laboratory of Geological Processes and Mineral Resources ; The North of Qinghai-Tibet Platean ; Xining 810012 ; China) ; Bao Guangpu
- 刊名：Northwestern Geology
- 出版年：2012
- 卷期：45(2)
- 关键词：花岗斑岩 ; granite porphyry ; 斑岩矿床 ; porphyry deposit ; 多金属矿 ; polymetallic ores ; 青海 ; Qinghai Province
- 页码：p.81-87
- 图表：illus., 1 table, 14 refs.
- 分类号：1001
- issnNo：ISSN1009-6248
- isbnNo：CN61-1149/P
摘要
The age of Maiduola granit-porphyry and Narigongma lithsomes , is the value of ( 40.86±0.4 ) Ma ,( 43.3±0.5 ) Ma , and they are the product of the early Stage of Yanshan , through the LAICP-M S zircon U-Pb isotopic dating , which indicate that many parts of the complex product of the times is the same lithsomes , the multi-metallic deposits of Cu , Mo , Pb , Zn , Au and Ag etc.of the porphyry types and trace elements ( include REE ) are found from narigongma , maiduola , yucongcongchabie , dilayi and hengsaiqing copper ore belt in the Eastern Tibet.The analytical results show that the ore-bearing porphyry and coexisting potassic plutons rocks , volcanic rocks and plutons have the same temporal-spatial distribution , uniform in the petrochemical compositions with alkali-rich ( w ( K 2 O+Na 2 O ) >5% ), high potassium and w ( K 2 O )/ w ( Na 2 O ) >1 , and a strong enrichment in LILE of Sr , Ba etc and LREE.This shows the characteristics of the shoshonitic series rocks , indicating the ore-bearing porphyry of the Zaduo copper ore belt in Eastern Zaduo belongs to the typical porphyry of the shoshonitic series.
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