Spatial distribution of the lithospheric density structure in three large cratons in China based on GOCE gravity gradient data

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Yu Tian , Huiyou He , Lei Shi , Qing Ye , Aizhi Guo , Yong Wang
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引用次数: 0

Abstract

The long-term stability of continental cratons can prevent them from being transformed by tectonic processes, such as late-stage plate subduction and convective erosion. This stability is closely related to their unique material composition and lithospheric root structure. The tectonics of China exhibit distinct features compared with those of other regions in the world. Studying the lithospheric density structure of the three large cratons offers an effective approach for understanding the dynamic mechanisms involved in the evolution of China continental cratons. Gravity observations are sensitive to density changes. In this study, after the GOCE satellite gravity gradient data in China and adjacent areas are processed, the methods of boundary identification and depth imaging are combined to effectively obtain the spatial distribution of the lithospheric density structure. The horizontal and vertical distributions of detailed structural lithospheric features in three large cratons in China are obtained. The results indicate that the North China Craton (NCC) has experienced destruction in both the north–south and east–west directions. The boundaries of the suture zone in the southern South China Craton (SCC) are consistent with the structural lines and are more oriented towards the eastern side of the Jiangshan Shaoxing Fault in the eastern SCC. At the southern edge of the Tarim Craton (TC), the features of the spatial distribution of density do not indicate southwards movement of material. With the features of the spatial distribution in three large cratons in China, the features of the distributions in three large cratons are compared, and the reasons for the dynamic mechanism are further analysed and summarized.
基于GOCE重力梯度数据的中国三大克拉通岩石圈密度结构空间分布
大陆克拉通的长期稳定性使其不受晚期板块俯冲和对流侵蚀等构造作用的影响。这种稳定性与其独特的物质组成和岩石圈根部结构密切相关。与世界其他地区的构造相比,中国的构造具有明显的特点。研究三大克拉通的岩石圈密度结构,为认识中国大陆克拉通演化的动力机制提供了有效途径。重力观测对密度变化很敏感。本研究在对中国及邻区GOCE卫星重力梯度数据进行处理后,结合边界识别和深度成像方法,有效获取岩石圈密度结构的空间分布。获得了中国三大克拉通岩石圈详细结构特征的水平和垂直分布。结果表明,华北克拉通经历了南北和东西两个方向的破坏。华南克拉通南部缝合带的边界与构造线一致,更偏向于东部的江山-绍兴断裂东侧。在塔里木克拉通南缘,密度空间分布特征不表明物质向南移动。结合中国三大克拉通的空间分布特征,比较了三大克拉通的空间分布特征,并进一步分析和总结了形成动力机制的原因。
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来源期刊
Precambrian Research
Precambrian Research 地学-地球科学综合
CiteScore
7.20
自引率
28.90%
发文量
325
审稿时长
12 months
期刊介绍: Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.
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