Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam
文献类型：期刊论文
| 作者 | Yang, Jianzhou1; Liu, Xiaochi1,2 ; Wu, Yuanbao1; Sun, Yanling1
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| 刊名 | JOURNAL OF EARTH SCIENCE
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| 出版日期 | 2015-10-01 |
| 卷号 | 26期号:5页码:617-625 |
| 关键词 | continental deep subduction ocean-continent transformation North Qaidam harzburgite eclogite |
| DOI | 10.1007/s12583-015-0585-0 |
| 文献子类 | Article |
| 英文摘要 | The North Qaidam UHPM (ultra-high pressure metamorphism) belt is a typical continental subduction-collision belt containing continental crust deep subduction metamorphic products and oceanic crust relics, And it is an ideal region to study the ocean-continent transition and exhumation mechanism of oceanic UHP rocks during continental deep subduction process. In this paper, we report integrated in situ U-Pb, Lu-Hf and 0 isotope analyses of zircons from a serpentinized harzburgite as well as U-Pb dating for zircons from a kyanite eclogite from the North Qaidam Dulan UHPM terrane, and use these data to discuss the ocean-continent transition and exhumation mechanisms of oceanic UHP rocks during continental deep subduction. The serpentinized harzburgite was dated at 448 +/- 9 Ma, consistent with 455 +/- 5 Ma age for the kyanite eclogite within analytical errors. Zircons from the serpentinized harzburgite have uniform Hf-176/Hf-177 values ranging from 0.282 842 to 0.282 883 and epsilon(Hf)(t) values from 11.6 to 13.3. Zircon delta O-18 values of the serpentinized harzburgite vary from 4.47 parts per thousand to 5.29 parts per thousand, slightly lower than the value of 5.3 parts per thousand +/- 0.6 parts per thousand for the normal mantle zircon. These Hf-O isotopic features indicate that the protolith of the serpentinized harzburgite was derived from depleted-mantle source, and might have experienced high-temperature rock-water interaction. Therefore, the serpentinized harzburgite was possibly located in the lower part of an oceanic section. The serpentinized harzburgite and kyanite eclogite were both formed due to the subduction of oceanic crust. The UHP metamorphism occurred successively from the oceanic crust to continental crust rocks of the North Qaidam UHP terrane. Low-density serpentinized peridotite and continental rocks possibly have negative buoyancy and play a key effect on preservation and exhumation of high-density oceanic eclogite. |
| WOS关键词 | PRESSURE METAMORPHIC ROCKS ; U-PB AGE ; NW CHINA ; TIBETAN PLATEAU ; WESTERN ALPS ; TRACE-ELEMENT ; 1ST RECORD ; EVOLUTION ; TERRANE ; GEOCHRONOLOGY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000362241100001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62232]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.China Univ Geosci, Dept Earth Sci, Wuhan 430074, Peoples R China 2.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 | Yang, Jianzhou,Liu, Xiaochi,Wu, Yuanbao,et al. Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam[J]. JOURNAL OF EARTH SCIENCE,2015,26(5):617-625. |
| APA | Yang, Jianzhou,Liu, Xiaochi,Wu, Yuanbao,&Sun, Yanling.(2015).Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam.JOURNAL OF EARTH SCIENCE,26(5),617-625. |
| MLA | Yang, Jianzhou,et al."Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam".JOURNAL OF EARTH SCIENCE 26.5(2015):617-625. |
入库方式： OAI收割
来源：地质与地球物理研究所
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