Recycled noble gases preserved in podiform chromitites from Luobusa, Tibet
文献类型：期刊论文
| 作者 | Guo, Wei1,2; He, Huaiyu1,2; Hilton, David R.3; Zheng, Yongfei4; Su, Fei1; Liu, Yan5; Zhu, Rixiang6 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2017-10-10 |
| 卷号 | 469页码:97-109 |
| 关键词 | Noble gas Podiform chromitite Ophiolite Subduction zone Luobusa Tibet |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2017.03.026 |
| 文献子类 | Article |
| 英文摘要 | We report noble gas (He, Ne, Ar) signatures of chromite and olivine separates from the Luobusa chromitites in Tibet to better understand the volatile compositions trapped in the minerals, and further to trace the origin of melts responsible for formation of the chromite deposits. The studied samples can be divided into two groups based on petrography and distinct noble gas signatures. Group I samples are free of carbonates and have He-3/He-4 ratios from 0.81 to 2.36 Ra (where Ra is the He-3/He-4 ratio of air = 1.4 x 10(-6)) and air-like Ne and Ar isotopic compositions irrespective of chromitite structure types. Most He-3/He-4 ratios of Group I samples are higher than air, suggesting apparent presence of mantle volatiles. Given the He-4/Ne-20 and He-3/Ar-36 several orders of magnitude higher than air, negligible contributions are from the atmospheric helium. The observed He isotope compositions thus can be regarded as a two-component mixture of mantle-derived and radiogenic He. A broadly positive correlation between He-3 and Ar-36 in nodular chromitite samples indicates a source mixing between mantle and recycled noble gases but not due to shallow air contamination. In addition, the wide distribution range of Ne-20/Ar-36 also supports a subduction-related origin of neon and argon. Combined with major element data, the most appropriate tectonic setting to generate such noble gas signatures in Group I samples is subduction zone (probably forearc) where favorable conditions are present for the formation of the chromitites. In contrast, Group II samples containing carbonates have much more radiogenic He-3/He-4 ratios of 0.03 to 0.3 Ra but much less radiogenic Ar-40/Ar-36 ratios of 344 to 420. In combination with the occurrence of carbonate veins it is suggested that Group II samples are predominated by supracrustal components that may be imparted during or after the emplacement stage. A comparison of these two group samples indicates that the primary noble gas signatures reflecting the characteristics of ore-forming melts can be preserved in chromite and olivine grains (Group I samples) and thus used to trace the origin of podiform chromitites. |
| WOS关键词 | BENEATH MIDOCEAN RIDGES ; MELT-ROCK INTERACTION ; SOUTHERN TIBET ; UPPER-MANTLE ; GEOCHEMICAL CONSTRAINTS ; ISOTOPE CHARACTERISTICS ; EQUATORIAL PACIFIC ; CONTINENTAL-CRUST ; OCEANIC-CRUST ; POPPING ROCK |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000412553200009 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China(41425031) ; National Natural Science Foundation of China(41425031) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Chinese Academy of Sciences(XDB18030505) ; Chinese Academy of Sciences(XDB18030505) ; National Natural Science Foundation of China(41425031) ; National Natural Science Foundation of China(41425031) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Chinese Academy of Sciences(XDB18030505) ; Chinese Academy of Sciences(XDB18030505) ; National Natural Science Foundation of China(41425031) ; National Natural Science Foundation of China(41425031) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Chinese Academy of Sciences(XDB18030505) ; Chinese Academy of Sciences(XDB18030505) ; National Natural Science Foundation of China(41425031) ; National Natural Science Foundation of China(41425031) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Ministry of Science and Technology of People's Republic of China(2016YFC0600105) ; Chinese Academy of Sciences(XDB18030505) ; Chinese Academy of Sciences(XDB18030505) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61987]  |
| 专题 | 地质与地球物理研究所_地球深部结构与过程研究室 |
| 通讯作者 | He, Huaiyu |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, CAS Key Lab Earths Deep Interior, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 3.UCSD, Scripps Inst Oceanog, Geosci Res Div, Fluids & Volatiles Lab, La Jolla, CA 92093 USA 4.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 5.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Wei,He, Huaiyu,Hilton, David R.,et al. Recycled noble gases preserved in podiform chromitites from Luobusa, Tibet[J]. CHEMICAL GEOLOGY,2017,469:97-109. |
| APA | Guo, Wei.,He, Huaiyu.,Hilton, David R..,Zheng, Yongfei.,Su, Fei.,...&Zhu, Rixiang.(2017).Recycled noble gases preserved in podiform chromitites from Luobusa, Tibet.CHEMICAL GEOLOGY,469,97-109. |
| MLA | Guo, Wei,et al."Recycled noble gases preserved in podiform chromitites from Luobusa, Tibet".CHEMICAL GEOLOGY 469(2017):97-109. |
入库方式： OAI收割
来源：地质与地球物理研究所
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