Petrology and geochemistry of the Guyang hornblendite complex in the Yinshan block, North China Craton: Implications for the melting of subduction-modified mantle
文献类型：期刊论文
| 作者 | Ma, Xudong1; Fan, Hong-Rui2; Santosh, M.3; Guo, Jinghui4 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 273页码:38-52 |
| 关键词 | Hornblendites Geochemical characteristics Petrogenesis Neoarchean North China Craton |
| DOI | 10.1016/j.precamres.2015.12.001 |
| 文献子类 | Article |
| 英文摘要 | The hornblendite complexes hosted in the Guyang granite-greenstone terrane form part of the Neoarchean basement in the Western Block of the North China Craton. In this study, we focus on the largest one from this block, previously named the Guyang komatiite, and present results from litho logical, geochronological and geochemical studies. The dominant lithology in the Guyang hornblendite complex is greenschist fades hornblendite, and can be divided into clinopyroxene hornblendite (similar to 75%) and olivine-orthopyroxene hornblendite (similar to 25%). The oldest calculated Re depletion model ages (T-RD) of these hornblendites is of 2454 Ma, and the zircon U-Pb age of the wallrock is 2480 Ma, with single-stage depleted mantle Nd model ages T-DM1 (Nd) varying from 2.61 to 2.88 Ga. These data suggest that the Guyang hornblendite complexes formed during Neoarchean-Paleoproterozoic time. The hornblendites show low SiO2, high MgO contents and are enriched in Cr, Ni, and LREE with negative Ce anomalies and depleted in Ti, Nb and Ta. Their Os-187/Os-188 ratios range from 0.11145 to 0.11279, with gamma Os-(2.5Da) varying from -3.9 to +1.4. Geochemically, the olivine-orthopyroxene hornblendite shows little variation with typical cumulate feature. In contrast, the clinopyroxene hornblendite shows a large range of chemical variation. In the CaO vs. MgO and CaO/Al2O3 vs. MgO diagrams, the clinopyroxene hornblendite shows Opx fractionation trend. Combined with lithological information, we infer that the hornblendite magma was emplaced as a crystal mush, with orthopyroxene as cumulus phase. The Os and Nd isotope composition, negative Nb, Ta, Ce anomalies, and the relationships in Th/Yb-Nb/Yb diagram suggest that the Guyang hornblendites formed from a source mantle that was modified by subduction-related melts/fluids derived from a seawater-altered basaltic slab. Compared with typical Archean komatiites, the rocks of present study show significant differences in lithological and geochemical characteristics, and thus it cannot be named as komatiite. To explain these characteristics, we propose a geodynamic model involving ridge subduction and slab window mechanism to account for the formation of the Guyang hornblendite complex. (C) 2015 Elsevier B.V. All rights reserved. |
| WOS关键词 | LIAO-JI BELT ; PRESSURE PELITIC GRANULITES ; PB ZIRCON GEOCHRONOLOGY ; RE-OS ISOTOPE ; LA-ICP-MS ; U-PB ; TECTONIC IMPLICATIONS ; GREENSTONE-BELT ; JIAOBEI MASSIF ; PERIDOTITE XENOLITHS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000369198400003 |
| 资助机构 | National Natural Science Foundation of China(41202138) ; National Natural Science Foundation of China(41202138) ; Major State Basic Research Development Program(2012CB416605) ; Major State Basic Research Development Program(2012CB416605) ; National Natural Science Foundation of China(41202138) ; National Natural Science Foundation of China(41202138) ; Major State Basic Research Development Program(2012CB416605) ; Major State Basic Research Development Program(2012CB416605) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62083]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Met & Mineral Assessment, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.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 | Ma, Xudong,Fan, Hong-Rui,Santosh, M.,et al. Petrology and geochemistry of the Guyang hornblendite complex in the Yinshan block, North China Craton: Implications for the melting of subduction-modified mantle[J]. PRECAMBRIAN RESEARCH,2016,273:38-52. |
| APA | Ma, Xudong,Fan, Hong-Rui,Santosh, M.,&Guo, Jinghui.(2016).Petrology and geochemistry of the Guyang hornblendite complex in the Yinshan block, North China Craton: Implications for the melting of subduction-modified mantle.PRECAMBRIAN RESEARCH,273,38-52. |
| MLA | Ma, Xudong,et al."Petrology and geochemistry of the Guyang hornblendite complex in the Yinshan block, North China Craton: Implications for the melting of subduction-modified mantle".PRECAMBRIAN RESEARCH 273(2016):38-52. |
入库方式： OAI收割
来源：地质与地球物理研究所
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