globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2019.102954
论文题名:
Early Neoproterozoic magmatic imprints in the Altun-Qilian-Kunlun region of the Qinghai-Tibet Plateau: Response to the assembly and breakup of Rodinia supercontinent
作者: Peng Y.; Yu S.; Li S.; Zhang J.; Liu Y.; Li Y.; Santosh M.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 199
语种: 英语
中文关键词: Altun-Qilian-Kunlun Mountain ; Convergent margin ; Neoproterozoic magmatism ; Rodinia supercontinent ; Zircon Geochronology
英文关键词: continental breakup ; convergent margin ; geochronology ; granitoid ; hafnium ; igneous geochemistry ; mafic rock ; magmatism ; mountain region ; petrology ; Proterozoic ; Rodinia ; uranium-lead dating ; zircon ; Altun Mountains ; China ; Kunlun Mountains ; Qilian Mountains ; Qinghai-Xizang Plateau
英文摘要: The Altun-Qilian-Kunlun Mountain (AQK), located on the northeastern margin of the Qinghai-Tibet Plateau, experienced multiple Neoproterozoic magmatic and metamorphic events which are correlated to the Rodinia supercontinent history. Here we present results from a systematic petrologic, geochemical, and zircon U–Pb and Hf isotopic study on Neoproterozoic granitoids and mafic rocks from the AQK. In conjunction with a review of the available age data, we divide the early Neoproterozoic magmatism in AQK into two stages: the first stage at ca. 1030–846 Ma and the second stage at ca. 860–660 Ma. The new Lu–Hf isotopic data coupled with published Lu–Hf and Sm–Nd results indicate that the stage 1 mafic rocks were mainly derived from a depleted mantle source with minor contamination with crustal materials or subducted sediments. The stage 2 mafic rocks were mainly derived from the depleted mantle with limited crustal contamination. Combined with whole-rock geochemical compositions and Sr–Nd isotopic data, the stage 1 granitic magmas are inferred to have been derived from reworked Paleoproterozoic-Mesoproterozoic crust and the stage 2 granitoid magmas mainly came from reworked continental crust with minor mantle magma input. The AQK experienced arc magmatism in a compressional environment on an active continental margin during the late Mesoproterozoic-early Neoproterozoic (1030–846 Ma), followed by rift-related magmatism in an extensional setting in the middle to late Neoproterozoic (860–660 Ma). Similarities in basement compositions, magmatism and metamorphism between the Qilian block (QL) and surrounding blocks suggest that the AQK was with a composite block at early Neoproterozoic. The assembly of AQK started as early as 1030 Ma with peak convergence at ca. ∼918 Ma. The initial breakup might have started from 860 Ma and lasted until to 660 Ma with the peak at ca. ∼765 Ma. These timings correspond well with those of the assembly and breakup of the Neoproterozoic supercontinent Rodinia. The breakup of AQK from the South China Craton might have occurred in the late Neoproterozoic, not until the opening of the Qilian ocean at around 660 Ma. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165907
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Submarine Geosciences and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Geology, and Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China; Institute of Geology, Chinese Academy of Geological Science, Beijing, 10037, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China

Recommended Citation:
Peng Y.,Yu S.,Li S.,et al. Early Neoproterozoic magmatic imprints in the Altun-Qilian-Kunlun region of the Qinghai-Tibet Plateau: Response to the assembly and breakup of Rodinia supercontinent[J]. Earth Science Reviews,2019-01-01,199
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