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| (40)~Ar/(39)~Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin, Tibet | |
| 作者姓名： | ZHANG Huihua HE Huaiyu WANG Jianghai & XIE Guanghong Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China College of Life Sciences Sun Yat-Sen University Guangzhou China |
| 作者单位： | ZHANG Huihua，HE Huaiyu，WANG Jianghai & XIE Guanghong Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China; Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China; College of Life Sciences，Sun Yat-Sen University，Guangzhou 510275，China |
| 基金项目： | 国家自然科学基金，广东省自然科学基金，中国科学院资助项目，国家重点基础研究发展计划(973计划)，US NSF |
| 摘 要： | Our two newly obtained high-quality 40Ar/39Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5±0.2 Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2 enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5±0.2 Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. et al., implying that they were formed in the same tectonic setting. |
40Ar/39Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin,Tibet |
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| ZHANG Huihua,HE Huaiyu,WANG Jianghai & XIE Guanghong Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China, College of Life Sciences,Sun Yat-Sen University,Guangzhou ,China.(40)~Ar/(39)~Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin, Tibet[J].Science in China(Earth Sciences),2005,48(1). | |
| Authors: | Zhang Huihua HE HuaiYu Wang Jianghai Xie Guanghong |
| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 3. College of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
| Abstract: | Our two newly obtained high-quality 40Ar/39Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5 ( 0.2 Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2 enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5 ( 0.2 Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. Et al., implying that they were formed in the same tectonic setting. |
| Keywords: | Cenozoic high-K volcanic rocks 40Ar/39Ar chronology Mangkang basin Tibet |
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