| 藏北多龙矿集区尕尔勤枕状玄武岩地球化学及SHRIMP测年 |
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| 关键词:SHRIMP dating petrogeochemistry pllow basalt Duolong Tibet |
| 基金项目:国土资源部公益性行业科研专项(编号: 201511017);自然科学基金项目(编号: 41402178);中国地质科学院院基本科研业务费(编号: YYWF201608);中国地质调查局二级项目(编号: DD20160026);中国地质调查局中国矿产地质与成矿规律综合集成和服务(矿产地质志)项目(编号: DD20160346);国家留学基金委项目 |
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| 摘要: |
| Petrogeochemistry and SHRIMP Dating of Ga’erqin Pillow Basalt in Duolong, Northern Tibet |
| Duolong is one of the largest porphyry Cu (Au) ore concentration areas, its dynamic history always being the hot topic for study. Pillow basalt was discovered in Jurassic marine sedimentary strata of Ga’erqin area. Geochronological and geochemical study is helpful to revealing the evolution history of Bangong Co-Nujiang Ocean. Geochemical data show that basalt has low REE (∑REE 38.01×10–6~63.56×10–6) and no significant differentiation between LREE and HREE. The chondrite-normalized REE patterns are flat, similar to features of E-MORB. SHRIMP dating shows that the age of pillow basalt is (298±11) Ma, coinciding with ages of mafic dykes and basalt in Late Carboniferous to Early Permian strata. All of these phenomena may be the products of large-scale volcanic activity for the opening of Bannu Ocean in early Permian strata. |
| LIN Bin,TANG Ju-xing,SONG Yang,WANG Qin,CAO Hua-wen,Michael BAKER,ZHANG Le-jun,LI Yu-bin.2017.Petrogeochemistry and SHRIMP Dating of Ga’erqin Pillow Basalt in Duolong, Northern Tibet[J].Acta Geoscientica Sinica,38(5):702-710. |
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