Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes
文献类型：期刊论文
| 作者 | Liu, Fang1,2; Li, Xin1 ; Wang, Guiqin1; Liu, Yufei1,2; Zhu, Hongli1,2; Kang, Jinting1,3; Huang, Fang3; Sun, Weidong4,5; Xia, Xiaoping1; Zhang, Zhaofeng1
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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| 出版日期 | 2017-12-01 |
| 卷号 | 122期号:12页码:9729-9744 |
| 关键词 | carbonate recycling Mg and Ca isotopes trachy-basalt trachy-andesite southeastern Tibet |
| ISSN号 | 2169-9313 |
| DOI | 10.1002/2017JB014206 |
| 通讯作者 | Zhang, Zhaofeng(zfzhang@gig.ac.cn) |
| 英文摘要 | Tracing and identifying recycled carbonates is a key issue to reconstruct the deep carbon cycle. To better understand carbonate subduction and recycling beneath the southeastern Tibetan Plateau, high-K cal-alkaline volcanic rocks including trachy-basalts and trachy-andesites from Tengchong were studied using Mg and Ca isotopes. The low Mg-26 (-0.310.03 to -0.380.03) and Ca-44/40 (0.67 +/- 0.07 parts per thousand to 0.80 +/- 0.04 parts per thousand) values of these volcanic rocks compared to those of the mantle (-0.25 +/- 0.07 parts per thousand and 0.94 +/- 0.05 parts per thousand, respectively) indicate the incorporation of isotopically light materials into the mantle source, which may be carbonate-bearing sediments with low Mg-26 and Ca-44/40 values. In addition, no correlations of Mg-26 and Ca-44/40 with either SiO2 contents or trace element abundance ratios (e.g., Sm/Yb and Ba/Y) were observed, suggesting that limited Mg and Ca isotopic fractionation occurred during cal-alkaline magmatic differentiation. A binary mixing model using Mg-Ca isotopes shows that 5-8% carbonates dominated primarily by dolostone were recycled back into the mantle. Since Tengchong volcanism is still active and probably related to ongoing plate tectonic movement, we propose that the recycled carbonates are derived from oceanic crust related to the ongoing subduction of the Indian plate. |
| 资助项目 | Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41373007] ; National Natural Science Foundation of China[91328204] ; State Key Laboratory of Geological Processes and Mineral Resources[GPMR201708] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000423129200046 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/157801]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Zhaofeng |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Univ Sci & Technol China, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei, Anhui, Peoples R China 4.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao, Peoples R China 5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Fang,Li, Xin,Wang, Guiqin,et al. Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(12):9729-9744. |
| APA | Liu, Fang.,Li, Xin.,Wang, Guiqin.,Liu, Yufei.,Zhu, Hongli.,...&Zhang, Zhaofeng.(2017).Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(12),9729-9744. |
| MLA | Liu, Fang,et al."Marine Carbonate Component in the Mantle Beneath the Southeastern Tibetan Plateau: Evidence From Magnesium and Calcium Isotopes".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.12(2017):9729-9744. |
入库方式： OAI收割
来源：海洋研究所
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