Age and nature of the Jurassic-Early Cretaceous mafic and ultramafic rocks from the Yilashan area, Bangong-Nujiang suture zone, central Tibet: implications for petrogenesis and tectonic Evolution | |
Yun Zhong; Xi-Chong Hu; Wei-Liang Liu; Bin Xia; Xiao Zhang; Wei Huang; Yuan-Bin Fu; Yu-Guang Wang | |
2018 | |
Source Publication | International Geology Review
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Volume | 60Issue:10Pages:1244-1266 |
Abstract | The Jurassic-Early Cretaceous Yilashan mafic-ultramafic complex is located in the middle part of the Bangong-Nujiang suture zone, central Tibet. It features a mantle sequence composed of peridotites and a crustal sequence composed of cumulate peridotites and gabbros that are intruded by diabases with some basalts. This article presents new whole-rock geochemical and geochronological data for peridotites, gabbros, diabases and basalts to revisit the petrogenesis and tectonic setting of the Yilashan mafic-ultramafic complex. Zircon laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) U-Pb ages of three diabase samples are 169.6 +/- 3.3Ma, 132.5 +/- 2.5Ma, and 133.6 +/- 4.9Ma, respectively. These ages together with previous studies indicate that the Yilashan mafic-ultramafic complex probably formed during the Jurassic-Early Cretaceous. The peridotites exhibit nearly U-shaped REE patterns and are distinct from abyssal peridotites. The diabase and basalt samples show arc features with selective enrichment in light rare earth elements (LREE) and large ion lithophile elements (LILEs; e.g. Rb, U, and Sr) and depletion in high field strength elements (HFSEs; e.g. Nb, Ta, and Ti). The gabbro samples display cumulate features with selective enrichment in LILEs (e.g. Rb, Ba, and Sr) but depletion in LREEs and HFSEs (e.g. Nb, Zr, and Ti). Combing the positive epsilon(Nd)(t) values (+6.1 to +10.0) and negative zircon epsilon(Hf)(t) values (-16.5 to -11.7 and -13.6 to -0.4) with older Hf model ages for the mafic rocks, these signatures suggest that the Yilashan mafic and ultramafic rocks likely originated from an ancient lithospheric mantle source with the addition of asthenospheric mantle materials and subducted fluids coupled with limited crustal contamination in a continental arc setting as a result of the southward subduction of the Bangong-Nujiang Tethys Ocean beneath the Lhasa terrane during the Jurassic-Early Cretaceous. |
Keyword | Yilashan Mafic And ultraMafic Rocks Continental Arc La-icp-ms Dating Geochemistry |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/8778 |
Collection | 矿床地球化学国家重点实验室 |
Affiliation | 1.School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, China 2.Island Protection and Utilization Research Center, National Marine Environmental Monitoring Center, Dalian, China 3.School of Marine Sciences, Sun Yat-sen University, Guangzhou, China 4.Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Offshore Oil Exploration and Development Center, Sun Yat-sen University, Guangzhou, China 5.Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, Guangzhou, China 6.State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Guiyang, China 7.Xizang Geological Survey Institute, Tibet Autonomous Region Geological And Mineral Exploration And Development Bureau, Lhasa, China |
Recommended Citation GB/T 7714 | Yun Zhong;Xi-Chong Hu;Wei-Liang Liu;Bin Xia;Xiao Zhang;Wei Huang;Yuan-Bin Fu;Yu-Guang Wang. Age and nature of the Jurassic-Early Cretaceous mafic and ultramafic rocks from the Yilashan area, Bangong-Nujiang suture zone, central Tibet: implications for petrogenesis and tectonic Evolution[J]. International Geology Review,2018,60(10):1244-1266. |
APA | Yun Zhong;Xi-Chong Hu;Wei-Liang Liu;Bin Xia;Xiao Zhang;Wei Huang;Yuan-Bin Fu;Yu-Guang Wang.(2018).Age and nature of the Jurassic-Early Cretaceous mafic and ultramafic rocks from the Yilashan area, Bangong-Nujiang suture zone, central Tibet: implications for petrogenesis and tectonic Evolution.International Geology Review,60(10),1244-1266. |
MLA | Yun Zhong;Xi-Chong Hu;Wei-Liang Liu;Bin Xia;Xiao Zhang;Wei Huang;Yuan-Bin Fu;Yu-Guang Wang."Age and nature of the Jurassic-Early Cretaceous mafic and ultramafic rocks from the Yilashan area, Bangong-Nujiang suture zone, central Tibet: implications for petrogenesis and tectonic Evolution".International Geology Review 60.10(2018):1244-1266. |
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