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Provenance and tectonic setting of the Triassic clastic deposits in the Napo basin, South China: evidence from petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology

文献类型：期刊论文

作者Xia, Lei2,3; Yan, Quan-Ren3; Xiang, Zhong-Jin1,4; Zheng, Hong-Bo2; Hou, Quan-Lin3; Wei, Wei3,5; Xia, Wen-Jing6
刊名GEOLOGICAL MAGAZINE
出版日期2021-12-01
卷号158期号:12页码:2095-2114
关键词sedimentary facies detrital zircon U-Pb dating provenance Palaeo-Tethys South China Block
ISSN号0016-7568
DOI10.1017/S0016756821000558
英文摘要The provenance and tectonic setting of the Lower-Middle Triassic clastic sediments from the Napo basin, South China, have been examined here using detrital modes, whole-rock geochemistry and detrital zircon U-Pb ages. Field investigations indicate that these sediments consist of fan delta, slope and turbidity fan facies with dominantly southward palaeocurrent directions. Detrital modes and geochemical characteristics of the clastic rocks indicate that they were derived from mixed magmatic arc and Palaeozoic successions in a continental island arc setting, with no significant sediment recycling. The U-Pb age spectra of sandstone detrital zircons from different stratigraphic positions are similar, with one major group (300-230 Ma), two subordinate groups (400-320 Ma and 480-420 Ma, respectively) and two scattered groups (1200-800 Ma and 2000-1700 Ma, respectively). Thus, we consider that the north late Permian - Middle Triassic volcanic rocks and the uplifted Palaeozoic sedimentary/volcanic sequences constituted the predominant sources. The detritus derived from the late Permian Emeishan mafic rocks is subordinate and limited. The pre-Devonian zircons are likely sedimentary-recycled or magmatic-captured instead of directly derived from the early Palaeozoic orogen (e.g. Yunkai massif) and Neoproterozoic Jiangnan orogen because of the topographic barrier of a magmatic arc and carbonate platform. Considering the spatial and temporal distribution characteristics of the volcanic arc and ophiolite, we suggest that the Triassic Napo basin was a fore-arc basin within a continental island arc setting, which developed in response to the northward subduction of the Babu-Cao Bang branch ocean beneath the South China Block.
WOS关键词TRUONG SON BELT ; INDO-CHINA ; INDOSINIAN OROGENY ; NANPANJIANG BASIN ; NORTHERN VIETNAM ; YUNNAN PROVINCE ; SW CHINA ; NORTHEASTERN VIETNAM ; PERMIAN BASALTS ; VOLCANIC-ROCKS
资助项目National Natural Science Foundation of China[41602180] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0704] ; China Geological Survey[12120113067500] ; China Geological Survey[1212011085415] ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS[J1901-24]
WOS研究方向Geology
语种英语
WOS记录号WOS:000717139300003
出版者CAMBRIDGE UNIV PRESS
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Geological Survey ; China Geological Survey ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Geological Survey ; China Geological Survey ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Geological Survey ; China Geological Survey ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; China Geological Survey ; China Geological Survey ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS ; Foundation of Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, CAGS
源URL[http://ir.iggcas.ac.cn/handle/132A11/103829]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Xia, Lei
作者单位1.Minist Nat Resources, Key Lab Deep Earth Dynam, Beijing 100037, Peoples R China
2.Yunnan Univ, Yunnan Key Lab Earth Syst Sci, Kunming 650500, Yunnan, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
6.Beihang Univ, Dept Student Affairs, Beijing 100191, Peoples R China
推荐引用方式
GB/T 7714		 Xia, Lei,Yan, Quan-Ren,Xiang, Zhong-Jin,et al. Provenance and tectonic setting of the Triassic clastic deposits in the Napo basin, South China: evidence from petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology[J]. GEOLOGICAL MAGAZINE,2021,158(12):2095-2114.
APA Xia, Lei.,Yan, Quan-Ren.,Xiang, Zhong-Jin.,Zheng, Hong-Bo.,Hou, Quan-Lin.,...&Xia, Wen-Jing.(2021).Provenance and tectonic setting of the Triassic clastic deposits in the Napo basin, South China: evidence from petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology.GEOLOGICAL MAGAZINE,158(12),2095-2114.
MLA Xia, Lei,et al."Provenance and tectonic setting of the Triassic clastic deposits in the Napo basin, South China: evidence from petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology".GEOLOGICAL MAGAZINE 158.12(2021):2095-2114.

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来源：地质与地球物理研究所

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