| Geochemical constraints on a mixed pyroxenite-peridotite source for East Pacific Rise basalts | |
| Zhang, Guo-Liang1; Zong, Chun-Lei2; Yin, Xue-Bo1; Li, He3; Zhang, GL (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China. | |
| 2012-11-10 | |
| 发表期刊 | CHEMICAL GEOLOGY
 |
| ISSN | 0009-2541 |
| 卷号 | 330页码:176-187 |
| 文章类型 | Article |
| 摘要 | The extent to which the lithological heterogeneity of the mantle source controls mid-oceanic ridge basalt (MORB) compositions remains largely debated. The recycling of oceanic crust into the mantle is widely considered to be an important cause of mantle source heterogeneity. We provide data for major and trace elements and Sr-Nd-Pb isotopes of thirteen mid-ocean ridge basalt (MORB) samples from the East Pacific Rise (EPR) to investigate the mantle source heterogeneity introduced by recycled oceanic crust (ROC). Relationships of Sr-Nd-Pb isotopes and incompatible trace element ratios, such as Sm/Yb and Hf/Zr, and ratios Zn/Fe, Co/Fe and (Pb/Pb*)(N) indicate a geochemically and lithologically heterogeneous mantle source. Mixing between components from depleted mantle (DMM) and enriched ROC-derived pyroxenite is required to explain these relationships. The relatively high Sm/Yb and the good correlation of Sr-87/Sr-86 vs. Sr/Nd are in concert with variable contributions from a pyroxenite component derived from recycled plagioclase-fractionated E-MORB. The narrow range of MgO contents (7.49 wt.% to 8.58 wt.%) and the correlations of major contents with Sr-87/Sr-86 and Zn/Fe ratios indicate the control of a mixed pyroxenite-peridotite source on the major element compositions of these lavas. To further investigate the major element contribution from the lithologically heterogeneous mantle source (peridotite/pyroxenite), major element compositions were corrected for fractional crystallization both to a given MgO wt.% and a given liquidus temperature. After correction for fractional crystallization, the Fear and Na2O increase and CaO decreases with increasing melt proportion from the enriched end-member. Based on the observations of this study and the results from partial melting experiments on pyroxenite and peridotite, a melting model, in which magma forms by mixing a deep and enriched melt (pyroxenite melt) with a shallow and depleted DMM melt (peridotite melt), provides a likely mechanism that can produce the major element systematics. (C) 2012 Elsevier B.V. All rights reserved. |
| 关键词 | Mid-ocean Ridge Basalt Major Element Heterogeneity Recycled Oceanic Crust Pyroxenite East Pacific Rise |
| 学科领域 | Geochemistry & Geophysics |
| DOI | 10.1016/j.chemgeo.2012.08.033 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000311241000014 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/12503 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, GL (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Western Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Zhang, Guo-Liang,Zong, Chun-Lei,Yin, Xue-Bo,et al. Geochemical constraints on a mixed pyroxenite-peridotite source for East Pacific Rise basalts[J]. CHEMICAL GEOLOGY,2012,330:176-187. |
| APA | Zhang, Guo-Liang,Zong, Chun-Lei,Yin, Xue-Bo,Li, He,&Zhang, GL .(2012).Geochemical constraints on a mixed pyroxenite-peridotite source for East Pacific Rise basalts.CHEMICAL GEOLOGY,330,176-187. |
| MLA | Zhang, Guo-Liang,et al."Geochemical constraints on a mixed pyroxenite-peridotite source for East Pacific Rise basalts".CHEMICAL GEOLOGY 330(2012):176-187. |
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