Mineralogical and geochemical study of a newly discovered mafic granulite, northwest China: Implications for tectonic evolution of the Altay Orogenic Belt
文献类型：期刊论文
| 作者 | Chen, HL; Li, ZL; Yang, SF; Dong, CW; Xiao, WJ; Tainosho, Y |
| 刊名 | ISLAND ARC
 |
| 出版日期 | 2006-03-01 |
| 卷号 | 15期号:1页码:210-222 |
| 关键词 | Altay Orogenic Belt Geochemistry Mafic Granulite Mineralogy Tectonic Evolution |
| ISSN号 | 1038-4871 |
| DOI | 10.1111/j.1440-1738.2006.00510.x |
| 文献子类 | Article |
| 英文摘要 | A mafic granulite body was newly discovered in the Altay Orogenic Belt, northwest China. The rocks comprise a suite of coarse-grained and fine-grained granulites. Orthopyroxenes (hypersthenes) in the rocks have high X-Mg and low Al2O3 contents, whereas clinopyroxenes have low TiO2 and Al2O3 contents. Amphiboles and biotites have a high Mg/(Mg + Fe2+) ratio and low contents of F and Cl. The peak metamorphic pressure-temperature (P-T) conditions are estimated as 750-780 degrees C and 6-7 kbar, and retrograde P-T conditions are in the range of 590-620 degrees C and 2.3-3.7 kbar, indicating significant decompression. Metamorphic reactions and P-T estimates define a clockwise P-T path. Geochemically, the rocks are high in Mg/(Mg + Fe) and Al2O3, depleted in U, Th, K and Rb, and characterized by light rare earth element enrichment and a weak positive Eu anomaly. The Altay mafic granulite shows depleted Nb, P and Ti contents in the mid-oceanic ridge basalt normalized spider diagram. The geochemical characteristics suggest that the protolith of the Altay mafic granulite was calc-alkaline basalt and andesite with an island-arc affinity. The rock has a high Nd-143/Nd-144 ratio with epsilon Nd(0) > 0, indicating derivation from a mantle-depleted source. In the present study, a two-stage model for the evolution of the Altay mafic granulite is proposed: an early stage in which calc-alkaline basalt and andesite with island-arc affinity were subducted into a deeper level of the crust and subjected to granulite-facies metamorphism generating the mafic granulite, followed by the later stage exhumation of the system into the upper crust by the late Paleozoic thrusting. |
| WOS关键词 | SOR-RONDANE MOUNTAINS ; PHANEROZOIC CRUSTAL GROWTH ; EAST ANTARCTICA ; VOLCANIC-ROCKS ; SOUTHERN INDIA ; TEMPERATURE GRANULITES ; ISOTOPIC EVIDENCE ; FLUID INCLUSIONS ; COMPLEX SYSTEMS ; PLUTONIC ROCKS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000235841300017 |
| 出版者 | BLACKWELL PUBLISHING |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66070]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, ZL |
| 作者单位 | 1.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Kobe Univ, Fac Human Dev, Kobe, Hyogo 6578507, Japan |
| 推荐引用方式 GB/T 7714 | Chen, HL,Li, ZL,Yang, SF,et al. Mineralogical and geochemical study of a newly discovered mafic granulite, northwest China: Implications for tectonic evolution of the Altay Orogenic Belt[J]. ISLAND ARC,2006,15(1):210-222. |
| APA | Chen, HL,Li, ZL,Yang, SF,Dong, CW,Xiao, WJ,&Tainosho, Y.(2006).Mineralogical and geochemical study of a newly discovered mafic granulite, northwest China: Implications for tectonic evolution of the Altay Orogenic Belt.ISLAND ARC,15(1),210-222. |
| MLA | Chen, HL,et al."Mineralogical and geochemical study of a newly discovered mafic granulite, northwest China: Implications for tectonic evolution of the Altay Orogenic Belt".ISLAND ARC 15.1(2006):210-222. |
入库方式： OAI收割
来源：地质与地球物理研究所
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