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DOI | 10.1130/B35225.1 |
Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau | |
Tan, Jun1; Wei, Jun-Hao1; Zhao, Shao-Qing2; Li, Yan-Jun1; Liu, Yan1; Liu, Xiao-Yang1; Zhang, Fei3; Gan, Jin-Rong1; Wang, Zhi-Hua1 | |
2020-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:5-6页码:955-976 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; England |
英文摘要 | Recent research on Paleo-Tethys tectonics has identified a huge late Paleozoic to Mesozoic igneous belt that extends more than 2500 km in the northeast Tibetan Plateau. However, the magma genesis and evolution in this belt remains a subject of considerable debate. This paper presents a combination of zircon U-Pb ages, mineral compositions, major and trace element concentrations, and Sr-Nd-Hf isotopic data for the plutons across the Zhiduo arc belt that marks the site connecting different tectonic-magmatic units. The studied rocks from one quartz diorite, two granodiorite plutons, and their mafic enclaves define a continuous compositional evolution varying from high- to mediumK calc-alkaline gabbroic diorite to granodiorite. Laser ablation-inductively coupled plasma-mass spectroscopy U-Pb analyses of zircons from these three plutonic suites and one mafic enclave yield Late Triassic ages of 222-217 Ma, establishing that the mafic and felsic magmas were nearly coeval. All these rocks are featured by zoned hornblende and plagioclase with Mg- and Ca-rich mantles or oscillatory change in compositions. They exhibit high and variable MgO (up to 4.88-5.66 wt %), Cr, and Ni contents except that one granitoid pluton (Dangjiangrong) possesses high Co (up to 145.0 ppm). They are characterized by subduction-type trace element patterns, with prominent positive Rb, Th, Pb, and K anomalies and negative Ba, Nb, P, and Ti. Together with continu- ous and heterogeneous Sr-, Nd-, and zircon Hf-isotopic compositions, it suggests that these Late Triassic high-Mg diorites and associated granitoids were generated through magma mixing and fractional crystallization accompanied by chemical exchange. Taking into account the magmatic record from nearby regions, we suggest that double-sided subduction and rollback of the subducting Paleo-Tethys oceanic slab is the main mechanism to generate geochemically-varied magmatism in the northeast Tibetan Plateau, and eventually close the Paleo-Tethys Ocean during much of the Late Triassic. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530917400005 |
WOS关键词 | GARZE FOLD BELT ; ADAKITIC MAGMATISM ASSOCIATION ; SONGPAN-GANZI GRANITOIDS ; ARC/BACK-ARC ASSEMBLAGES ; SETOUCHI VOLCANIC BELT ; FELSIC IGNEOUS ROCKS ; SLAB-DERIVED MELTS ; PB ZIRCON AGES ; A-TYPE GRANITE ; SW CHINA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279471 |
专题 | 地球科学 |
作者单位 | 1.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China; 2.Yangtze Univ, Sch Geosci, Wuhan 430100, Peoples R China; 3.Univ Exeter, Camborne Sch Mines, Penryn TR10 9FE, Cornwall, England |
推荐引用方式 GB/T 7714 | Tan, Jun,Wei, Jun-Hao,Zhao, Shao-Qing,et al. Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):955-976. |
APA | Tan, Jun.,Wei, Jun-Hao.,Zhao, Shao-Qing.,Li, Yan-Jun.,Liu, Yan.,...&Wang, Zhi-Hua.(2020).Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),955-976. |
MLA | Tan, Jun,et al."Petrogenesis of Late Triassic high-Mg diorites and associated granitoids with implications for Paleo-Tethys evolution in the northeast Tibetan Plateau".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):955-976. |
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