DOI: 10.1016/j.palaeo.2016.11.045
论文题名: What generated the Late Permian to Triassic unconformities in the southern Junggar Basin and western Turpan Basin; tectonic uplift, or increasing aridity?
作者: Liu D. ; Zhang C. ; Yao E. ; Song Y. ; Jiang Z. ; Luo Q.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 468 起始页码: 1
结束页码: 17
语种: 英语
英文关键词: Central Asian Orogenic Belt
; Detrital zircon
; Geochemistry
; Heavy minerals
; Paleoclimate
; Tian Shan
英文摘要: The Upper Permian to Triassic sedimentary successions of the southern Junggar Basin and western Turpan Basin are characterized by widespread unconformities. However, the origin of these unconformities remains highly controversial. Three sections, namely the Jimsar section in the southern Junggar Basin and the Aiweiergou and Yuergou sections in the western Turpan Basin, have been systematically studied using detrital zircon U-Pb geochronology, heavy mineral assemblages, and whole-rock geochemical analyses. Detrital zircon ages show that both Upper Permian and Triassic samples from each section have similar age distributions, with a major age group at 250–380 Ma, a subordinate age group at 380–540 Ma, and sporadic Precambrian ages, suggesting that the main provenance areas were the North Tian Shan and the northern margin of the Yili-Central Tian Shan, with a secondary source area in the Yili-Central Tian Shan. REE distributions and trace element crossplots also indicate that Upper Permian and Triassic samples display similar characteristics in both basins; all were sourced from felsic or mixed mafic/felsic rocks, with only a minor component of ancient or recycled sediments. Detrital provenance and geochemical analyses agree in showing no significant changes in the source-to-sink sediment transport system from the Late Permian to the Triassic. However, field observations, heavy minerals analysis, and geochemistry do suggest that both the southern Junggar Basin and western Turpan Basin experienced an arid climate during this interval. Both Upper Permian and Triassic sediments in the two basins contain abundant hematite, display low CIA values and Th/U ratios, and have mudcracks, redbeds, and other indicators of arid climate. Therefore, we suggest that the regional unconformities in the two basins were not generated by regional tectonic uplift, but most likely resulted from an increasingly arid climate. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67961
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China; Unconventional Natural Gas Institute, China University of Petroleum, Beijing, China; College of Geosciences, China University of Petroleum, Beijing, China
Recommended Citation:
Liu D.,Zhang C.,Yao E.,et al. What generated the Late Permian to Triassic unconformities in the southern Junggar Basin and western Turpan Basin; tectonic uplift, or increasing aridity?[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,468