Nature and processes of the lithospheric mantle beneath the western Qinling: Evidence from deformed peridotitic xenoliths in Cenozoic kamafugite from Haoti, Gansu Province, China
文献类型：期刊论文
| 作者 | Su, Ben-Xun; Zhang, Hong-Fu; Ying, Ji-Feng; Xiao, Yan; Zhao, Xin-Miao |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2009-03-31 |
| 卷号 | 34期号:3页码:258-274 |
| 关键词 | Cenozoic kamafugite Deformed peridotite Lithospheric mantle Melt pocket Western Qinling |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2008.05.009 |
| 文献子类 | Article |
| 英文摘要 | The Cenozoic Haoti kamafugite field (23 Ma) is situated at the western Qinling Orogen, Gansu Province in China, which is a conjunction region of the North China Craton, the Yangtze Craton and the Tibetan Plateau. Fresh peridotitic xenoliths entrained in these volcanic rocks provide an opportunity to study the nature and processes of the lithospheric mantle beneath the western Qinling. These xenoliths can be divided into two groups based on the petrological features and mineral compositions, type I and type 2. Type I xenoliths with strongly deformed texture have higher Fo (90-92.5) contents in olivines, Mg# (91-94) and Cr# (15-35) of clinopyroxenes, and Cr# (36-67) of spinels than the weakly deformed type 2 xenoliths, which have the corresponding values of 89-90, 89-91.5,10-15 and 5-15 in minerals, respectively. CaO contents in fine-grained olivines are slightly higher than 0.10 wt% compared with coarse-grained ones (less than 0.10 wt%). Fine-grained clinopyroxenes have low Al(2)O(3) + CaO contents (generally <23 wt%) relative to coarse-grained ones (>23 wt%). Fo contents in fine-grained olivines mainly in the melt pocket of the type I xenoliths are higher than those in coarse-grained ones, which is somewhat contrary to the type 2 xenoliths without melt pocket. Clinopyroxenes of the type 2 display higher Na(2)O contents (1.7-1.9 wt%) than those of the type 1 (<1.4 wt%). P-T estimations reveal that the type I xenoliths give temperature in range of 1106-1187 degrees C and pressure of 21-26 kbar and that relatively low temperature (907 and 1022 degrees C) and pressure (19.0 and 18.5 kbar) for the type 2 xenoliths. The type I xenoliths are characterized by depletion due to high degree of partial melting (>10%), modal metasomatic and deformed characteristics, and may represent the old refractory lithospheric mantle. In contrast, the type 2 peridotites show fertile features with low degree of partial melting (<5%) and may represent the newly-accreted lithospheric mantle. The lithospheric mantle beneath the western Qinling underwent partial melting, recrystallization, deformation and metasomatism due to asthenospheric upwelling and the latest decompression responding to the Cenozoic extensive tectonic environment. These processes perhaps are closely related to the evolution of Tibetan Plateau caused by the India-Asian collision. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved. |
| WOS关键词 | NORTH CHINA ; ORTHO-PYROXENE ; ULTRAMAFIC XENOLITHS ; GEOCHEMICAL EVIDENCE ; COMPLEX SYSTEMS ; VOLCANIC-ROCKS ; EASTERN CHINA ; MELT REACTION ; GARNET ; OLIVINE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000261710500003 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; 90714008 ; 90714008 ; 90714008 ; 90714008 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; 90714008 ; 90714008 ; 90714008 ; 90714008 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; 90714008 ; 90714008 ; 90714008 ; 90714008 ; 40721062) ; 40721062) ; 40721062) ; 40721062) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; Chinese Academy of Sciences(KZCX2YW-103) ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; National Science Foundation of China(40534022 ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; Univeristy of Hong Kong ; 90714008 ; 90714008 ; 90714008 ; 90714008 ; 40721062) ; 40721062) ; 40721062) ; 40721062) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/71466]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Su, Ben-Xun |
| 作者单位 | 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 | Su, Ben-Xun,Zhang, Hong-Fu,Ying, Ji-Feng,et al. Nature and processes of the lithospheric mantle beneath the western Qinling: Evidence from deformed peridotitic xenoliths in Cenozoic kamafugite from Haoti, Gansu Province, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2009,34(3):258-274. |
| APA | Su, Ben-Xun,Zhang, Hong-Fu,Ying, Ji-Feng,Xiao, Yan,&Zhao, Xin-Miao.(2009).Nature and processes of the lithospheric mantle beneath the western Qinling: Evidence from deformed peridotitic xenoliths in Cenozoic kamafugite from Haoti, Gansu Province, China.JOURNAL OF ASIAN EARTH SCIENCES,34(3),258-274. |
| MLA | Su, Ben-Xun,et al."Nature and processes of the lithospheric mantle beneath the western Qinling: Evidence from deformed peridotitic xenoliths in Cenozoic kamafugite from Haoti, Gansu Province, China".JOURNAL OF ASIAN EARTH SCIENCES 34.3(2009):258-274. |
入库方式： OAI收割
来源：地质与地球物理研究所
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