First identification of Carboniferous mafic dikes during a period of arc magmatic quiescence in the Northern Qiangtang terrane, central Tibet: Back-arc extension and implications for opening of the Xijir Ulan Ocean
文献类型：期刊论文
| 作者 | Yu, Zhi-Wei1,2; Dan, Wei2,3 ; Wang, Qiang1,2,3; Zhang, Xiu-Zheng2; Wang, Jun2; Chen, Bing1,2; Gong, Lin2
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| 刊名 | LITHOS
 |
| 出版日期 | 2024-09-01 |
| 卷号 | 480-481页码:16 |
| 关键词 | Back -arc basin Arc magmatic quiescence Paleo-Tethys Northern Qiangtang terrane Carboniferous |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2024.107662 |
| 英文摘要 | Numerous studies have focused on the effects of subduction zones on the development of back-arc basins. However, few have considered whether or how back-arc extension affects subduction zones. Back-arc spreading is thought to have resulted in reduced arc magma production in many Cenozoic subduction systems, but there are no documented pre-Cenozoic examples of this process. This paper reports new geochronological, mineralogical, geochemical, whole-rock Nd, and zircon Hf -O isotope data for Carboniferous mafic dikes (diabase and gabbro) from the Tuotuo River area, Northern Qiangtang terrane (NQT), central Tibet. The dikes were intruded during the middle Carboniferous (330-325 Ma). The dikes are typical arc-like basalts with enrichments of large-ion lithophile elements and depletions of high-field-strength elements. Depleted mantle-like Nd - Hf - O isotopes indicate the mafic rocks were formed by partial melting of metasomatized asthenospheric mantle. Clinopyroxene compositions follow the trends of both back-arc basin basalts (BABBs) and rift cumulates, and the whole-rock compositions are also similar to BABBs. Based on the tectonic evolution of the Paleo-Tethys Ocean in the Tibet segment, we propose that this Carboniferous mafic magmatism was caused by back-arc extension during a period of magmatic quiescence of the main Paleo-Tethyan subduction system. This back-arc extension may have led to the opening of the Xijir Ulan Ocean. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001248194500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78414]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Dan, Wei; Wang, Qiang |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem GIG, State Key Lab Isotope Geochem SKLaBIG, Wushan St, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Zhi-Wei,Dan, Wei,Wang, Qiang,et al. First identification of Carboniferous mafic dikes during a period of arc magmatic quiescence in the Northern Qiangtang terrane, central Tibet: Back-arc extension and implications for opening of the Xijir Ulan Ocean[J]. LITHOS,2024,480-481:16. |
| APA | Yu, Zhi-Wei.,Dan, Wei.,Wang, Qiang.,Zhang, Xiu-Zheng.,Wang, Jun.,...&Gong, Lin.(2024).First identification of Carboniferous mafic dikes during a period of arc magmatic quiescence in the Northern Qiangtang terrane, central Tibet: Back-arc extension and implications for opening of the Xijir Ulan Ocean.LITHOS,480-481,16. |
| MLA | Yu, Zhi-Wei,et al."First identification of Carboniferous mafic dikes during a period of arc magmatic quiescence in the Northern Qiangtang terrane, central Tibet: Back-arc extension and implications for opening of the Xijir Ulan Ocean".LITHOS 480-481(2024):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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