Ca-rich garnet-clinopyroxene rocks at hujialin in the Su-Lu terrane (Eastern China): Deeply subducted arc cumulates?
文献类型:期刊论文
作者 | Yang, JJ |
刊名 | JOURNAL OF PETROLOGY
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出版日期 | 2006-05-01 |
卷号 | 47期号:5页码:965-990 |
关键词 | arc cumulates Ca-rich garnet garnet-clinopyroxene rocks Su-Lu terrane UHP metamorphism |
ISSN号 | 0022-3530 |
DOI | 10.1093/petrology/egi102 |
英文摘要 | Layers of Ca-rich garnet-clinopyroxene rocks enclosed in a serpentinite body at Hujialin, in the Su-Lu terrane of eastern China, preserve igneous textures, relict spinel in garnet, and exsolution lamellae of Ca-rich garnet, ilmenite/magnetite, Fe-rich spinel, and also amphibole in clinopyroxene. In terms of their major and trace element compositions, the studied samples form a trend from arc cumulates towards Fe-Ti gabbros. Reconstructed augite compositions plot on the trend for clinopyroxene in arc cumulates. These data suggest that the rocks crystallized from mantle-derived magmas differentiated to various extents beneath an arc. The Ca-rich garnet + diopside assemblage is inferred to have formed by compressing Ca-rich augite, whereas the relatively Mg-rich cores of garnet porphyroblasts may have formed at the expense of spinel. The protolith cumulates were subducted from near the crust-mantle boundary (c. 1 GPa) deep into the upper mantle (4.8 +/- 0.6 GPa and 750 +/- 50 degrees C). Negatively sloped P-T paths for the garnet-clinopyroxene rocks and the corollary of corner flow induced subduction of mantle wedge peridotite are not supported by the available data. Cooling with, or without, decompression of the cumulates after the igneous stage probably occurred prior to deep subduction. |
语种 | 英语 |
WOS记录号 | WOS:000236432600005 |
出版者 | OXFORD UNIV PRESS |
源URL | [http://ir.iggcas.ac.cn/handle/132A11/66478] ![]() |
专题 | 中国科学院地质与地球物理研究所 |
通讯作者 | Yang, JJ |
作者单位 | 1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.NW Univ Xian, Key Lab Continental Dynam, Dept Geol, Xian 710069, Peoples R China |
推荐引用方式 GB/T 7714 | Yang, JJ. Ca-rich garnet-clinopyroxene rocks at hujialin in the Su-Lu terrane (Eastern China): Deeply subducted arc cumulates?[J]. JOURNAL OF PETROLOGY,2006,47(5):965-990. |
APA | Yang, JJ.(2006).Ca-rich garnet-clinopyroxene rocks at hujialin in the Su-Lu terrane (Eastern China): Deeply subducted arc cumulates?.JOURNAL OF PETROLOGY,47(5),965-990. |
MLA | Yang, JJ."Ca-rich garnet-clinopyroxene rocks at hujialin in the Su-Lu terrane (Eastern China): Deeply subducted arc cumulates?".JOURNAL OF PETROLOGY 47.5(2006):965-990. |
入库方式: OAI收割
来源:地质与地球物理研究所
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