| Major element, trace element, and Sr, Nd and Pb isotope studies of Cenozoic basalts from the South China Sea | |
| Yan QuanShu1,2; Shi Xuefa1; Wang KunShan1; Bu WenRui1; Xiao Long3 | |
| 2008-04-01 | |
| 发表期刊 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| ISSN | 1006-9313 |
| 卷号 | 51期号:4页码:550-566 |
| 文章类型 | Article |
| 摘要 | The whole rock K-Ar ages of basalts from the South China Sea basin vary from 3.8 to 7.9 Ma, which suggest that intra-plate volcanism after the cessation of spreading of the South China Sea (SCS) is comparable to that in adjacent regions around the SCS, i.e., Leiqiong Peninsula, northern margin of the SCS, Indochina block, and so on. Based on detailed petrographic studies, we selected many fresh basaltic rocks and measured their major element, trace element, and Sr-Nd-Pb isotope compositions. Geochemical characteristics of major element and trace element show that these basaltic rocks belong to alkali basalt magma series, and are similar to OIB-type basalt. The extent of partial melting of mantle rock in source region is very low, and magma may experience crystallization differentiation and cumulation during the ascent to or storing in the high-level magma chamber. Sr-Nd-Pb isotopic data of these basaltic rocks imply an inhomogeneous mantle below the South China Sea. The nature of magma origin has a two end-member mixing model, one is EM2 (Enriched Mantle 2) which may be originated from mantle plume, the other is DMM (Depleted MORB Mantle). Pb isotopic characteristics show the Dupal anomaly in the South China Sea, and combined with newly found Dupal anomaly at Gakkel ridge in Arctic Ocean, this implies that Dupal anomaly is not only limited to South Hemisphere. In variation diagrams among Sr, Nd and Pb, the origin nature of mantle below the SCS is similar to those below Leiqiong peninsula, northern margin of the SCS and Indochina peninsula, and is different from those below north and northeast China. This study provides geochemical constraints on Hainan mantle plume.; The whole rock K-Ar ages of basalts from the South China Sea basin vary from 3.8 to 7.9 Ma, which suggest that intra-plate volcanism after the cessation of spreading of the South China Sea (SCS) is comparable to that in adjacent regions around the SCS, i.e., Leiqiong Peninsula, northern margin of the SCS, Indochina block, and so on. Based on detailed petrographic studies, we selected many fresh basaltic rocks and measured their major element, trace element, and Sr-Nd-Pb isotope compositions. Geochemical characteristics of major element and trace element show that these basaltic rocks belong to alkali basalt magma series, and are similar to OIB-type basalt. The extent of partial melting of mantle rock in source region is very low, and magma may experience crystallization differentiation and cumulation during the ascent to or storing in the high-level magma chamber. Sr-Nd-Pb isotopic data of these basaltic rocks imply an inhomogeneous mantle below the South China Sea. The nature of magma origin has a two end-member mixing model, one is EM2 (Enriched Mantle 2) which may be originated from mantle plume, the other is DMM (Depleted MORB Mantle). Pb isotopic characteristics show the Dupal anomaly in the South China Sea, and combined with newly found Dupal anomaly at Gakkel ridge in Arctic Ocean, this implies that Dupal anomaly is not only limited to South Hemisphere. In variation diagrams among Sr, Nd and Pb, the origin nature of mantle below the SCS is similar to those below Leiqiong peninsula, northern margin of the SCS and Indochina peninsula, and is different from those below north and northeast China. This study provides geochemical constraints on Hainan mantle plume. |
| 关键词 | Cenozoic Alkali Basalt Dupal Anomaly Hainan Mantle Plume The South China Sea Geochemistry |
| 学科领域 | Geosciences, Multidisciplinary |
| DOI | 10.1007/s11430-008-0026-3 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000254362400008 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/5084 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentary & Environm Geol, Qingdao 266061, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan QuanShu,Shi Xuefa,Wang KunShan,et al. Major element, trace element, and Sr, Nd and Pb isotope studies of Cenozoic basalts from the South China Sea[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2008,51(4):550-566. |
| APA | Yan QuanShu,Shi Xuefa,Wang KunShan,Bu WenRui,&Xiao Long.(2008).Major element, trace element, and Sr, Nd and Pb isotope studies of Cenozoic basalts from the South China Sea.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,51(4),550-566. |
| MLA | Yan QuanShu,et al."Major element, trace element, and Sr, Nd and Pb isotope studies of Cenozoic basalts from the South China Sea".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 51.4(2008):550-566. |
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