Petrogenesis and magma residence time of lavas from Tengchong volcanic field (China): Evidence from U series disequilibria and Ar-40/Ar-39 dating
文献类型：期刊论文
| 作者 | Wang, F; Peng, ZC; Zhu, RX; He, HY; Yang, LK |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2006-01-24 |
| 卷号 | 7 |
| 关键词 | Tengchong Volcanoes Th-230-u-238 Disequilibria Petrogenesis Ar-40/ar-39 Dating Geochronology : Radioisotope Geochronology Geochronology : Isotopic Disequilibrium Dating |
| ISSN号 | 1525-2027 |
| DOI | 10.1029/2005GC001023 |
| 文献子类 | Article |
| 英文摘要 | [1] We present U-Th disequilibria measurements as well as radiogenic and trace element data for volcanic rocks erupted over the past similar to 200,000 years at Tengchong volcano field (TVF), near the collisional belt of India-Asia, southwestern China. Mineral separates, matrix, and whole rock were analyzed separately by mass spectrometry for Th-230-U-238 disequilibria. Whole rocks are characterized by either Th-230 enrichment or depletion relative to U-238. Three mineral internal Th-230 age isochrons and a CO2 laser Ar-40/Ar-39 age were determined. A difference of similar to 40 ka between the Th-230 age and the Ar-40/Ar-39 age can be interpreted as the residence time of the associated magma. Large variations in Sr, Nd, and Pb isotopic compositions and trace element ratios suggest more than one source for the TVF lavas. High Th contents, Th/U ratios and LILE element abundances, as well as their large variations can be attributed to partial melting of mantle previously metasomatized by subduction-derived components. Excesses of U-238 in some lavas could be the feature of another end-member, an arc-type melt, in the source. Fast extraction of the melts may result in the observed chemical disequilibrium. |
| WOS关键词 | ISOTOPE EVIDENCE ; MANTLE STRUCTURE ; TH ISOTOPES ; BASALTS ; ROCKS ; GEOCHEMISTRY ; CONSTRAINTS ; ORIGIN ; ISLAND ; AREA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000235025100001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65904]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wang, F |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 2.Univ Sci & Technol China, Dept Earth & Space Sci, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, F,Peng, ZC,Zhu, RX,et al. Petrogenesis and magma residence time of lavas from Tengchong volcanic field (China): Evidence from U series disequilibria and Ar-40/Ar-39 dating[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2006,7. |
| APA | Wang, F,Peng, ZC,Zhu, RX,He, HY,&Yang, LK.(2006).Petrogenesis and magma residence time of lavas from Tengchong volcanic field (China): Evidence from U series disequilibria and Ar-40/Ar-39 dating.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,7. |
| MLA | Wang, F,et al."Petrogenesis and magma residence time of lavas from Tengchong volcanic field (China): Evidence from U series disequilibria and Ar-40/Ar-39 dating".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 7(2006). |
入库方式： OAI收割
来源：地质与地球物理研究所
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