Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Yu, Zhi-Wei1,2; Dan, Wei1,3 ; Wang, Qiang1,2,3; Zhang, Xiu-Zheng1; Wang, Jun1; Chen, Bing1,2; Gong, Lin1
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| 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 | |
| Source Publication | LITHOS
 |
| ISSN | 0024-4937 |
| 2024-09-01 | |
| Volume | 480-481Pages:16 |
| DOI | 10.1016/j.lithos.2024.107662 |
| Language | 英语 |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| Abstract | 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. |
| Keyword | Back -arc basin Arc magmatic quiescence Paleo-Tethys Northern Qiangtang terrane Carboniferous |
| WOS ID | WOS:001248194500001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/78415 |
| Collection | 同位素地球化学国家重点实验室 |
| Corresponding Author | Dan, Wei; Wang, Qiang |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem GIG, State Key Lab Isotope Geochem SKLaBIG, Wushan St, Guangzhou 510640, Peoples R China |
| Recommended Citation 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. |
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