Mesozoic-Cenozoic tectonic-paleogeographic evolution of Bayingobi basin: response to subduction and collision of the Mongol-Okhotsk Ocean plate

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of the Geological Society Pub Date : 2024-03-12 DOI:10.1144/jgs2023-109

Liu Bo, Peng Hao, Peng Li, Haiyun Zhang, Xujie Guo, Pengfei Zhang, Yanwei Qin

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Abstract

The structures, sedimentary fill, and magmatic rocks of sedimentary basins are the products of regional tectonic evolution and are crucial to studying the basin's tectonic-paleogeographic environment and regional tectonic evolution. The present study discussed the zircon U-Pb dating of volcanic rocks samples, in-situ Hf isotope, and whole rock geochemistry analysis of the Bayingobi basin, the paleogeographic, sedimentary filling, and tectonic background of the Bayinggobi basin through the outcrop and core description of Meso-Cenozoic strata, stratigraphic correlation and lithofacies analysis. The U-Pb age of the volcanic rocks is 132–102 Ma, and the in-situ Hf isotopic values range from -20.99 to +29.48. The 87 Sr/ 86 Sr and 143 Nd/ 144 Nd isotopic ratios of the volcanic rocks are 0.707049–0.879761 and 0.511846–0.512540, respectively, and the Nd isotopic values range from -0.62 to -6.83. The volcanic rocks in the basin have the characteristics of congenital margin island arc volcanic rocks (CAA) with loss of Nb, Ta, and enrichment of Pb, originating mainly from dehydration melting of the plate subduction. The lower Cretaceous Bayingobi, Suhongtu, and Yingen Formations developed specifically delta-lacustrine deposits. The lower and upper member of the Bayinggobi Formation was deposited at Berriasian to Valanginian and Valanginian to late Aptian, respectively. The Suhongtu Formation was deposited during the late Aptian to early Albian and controlled by the strike of Engeer Us fault. The Yingen Formation was deposited in the late faulted depression stage at late Albian. Because of the subduction of the Mongol-Okhotsk Ocean plate in the Early Cretaceous, several depressions (sags) were formed in the Bayingobi basin, accompanied by the eruption of continental plate margin island arc magmas. With the closure of the Mongol-Okhotsk Ocean in the late early Cretaceous, the basin uplifted as a whole and the Upper Cretaceous Ulansuhai Formation was deposited. Supplementary material: https://doi.org/10.6084/m9.figshare.c.7105807

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巴音戈壁盆地中生代-新生代构造-古地理演变：对蒙古-奥霍次克大洋板块俯冲和碰撞的响应

沉积盆地的构造、沉积充填物和岩浆岩是区域构造演化的产物，对研究盆地的构造-古地理环境和区域构造演化至关重要。本研究通过对巴音郭楞盆地中新生代地层的出露和岩芯描述、地层关联和岩相分析，探讨了巴音郭楞盆地火山岩样品的锆石U-Pb年代测定、原位Hf同位素和全岩地球化学分析，以及巴音郭楞盆地的古地理、沉积充填和构造背景。火山岩的 U-Pb 年龄为 132-102 Ma，原位 Hf 同位素值为 -20.99 至 +29.48。火山岩的87 Sr/ 86 Sr及143 Nd/ 144 Nd同位素比值分別為0.707049-0.879761及0.511846-0.512540，Nd同位素值介乎-0.62至-6.83。盆地内的火山岩具有先天边缘岛弧火山岩（CAA）的特征，Nb、Ta丢失，Pb富集，主要来源于板块俯冲的脱水熔融作用。下白垩统巴音郭楞地层、苏宏图地层和银根地层专门发育三角洲-湖相沉积。巴音郭楞地层的下部和上部分别沉积于白垩纪至瓦朗基年和瓦朗基年至晚古生代。苏宏图地层沉积于晚古生代至早白垩世，受恩格尔乌斯断层走向控制。银根地层沉积于白垩纪晚期的断陷晚期。由于早白垩世蒙古-奥霍次克洋板块的俯冲作用，巴音戈壁盆地形成了多个坳陷（下陷），并伴随着大陆板块边缘岛弧岩浆的喷发。随着早白垩世晚期蒙古-呼和浩特洋的关闭，盆地整体隆起，沉积了上白垩世的乌兰素海地层。补充材料：https://doi.org/10.6084/m9.figshare.c.7105807

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来源期刊

Journal of the Geological Society 地学-地球科学综合

CiteScore

6.00

自引率

3.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.