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Multitaper spectral method to estimate the elastic thickness of South China: Implications for intracontinental deformation

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Geoscience Frontiers 2014年第2期5卷 193-203页

作者： Yangfan Deng Zhongjie Zhang Weiming Fan marta pérez-gussinyé State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Guangzhou Institute of Geochemistry Chinese Academy of Science Department of Earth Sciences Royal Holloway University of London

The effective elastic thickness （Te） represents the thickness of the elastic layer or the flexural rigidity of the lithosphere, the equivalent of which can be calculated from the spectral analysis of gravity and topographic data. Studies of Te have profound influence on intracontinental deformation, and coupling of the tectonic blocks. In this paper, we use the multitaper spectral estimation method to calculate the coherence between Bouguer gravity and topography data, and to obtain the Te map of South China. Through the process of correction, we discuss the relationships of Te versus heat flow, and Te versus seismicity. The results show that Te distribution of South China is affected by three factors：the original age, which controls the basic feature;the Mesozoic evolution, which affects the Te distribution;and the neotectonic movement, which shaped the final distribution. The crust age has a positive correlation with the first-order Te distribution;thus the Yangtze Craton has a relatively higher Te （about 50 km） whereas the Te in Cathaysia block is only 10e20 km. By analysis and comparison among the tectonic models of South China, the Te distribution can be well explained using the flat-subduction model. As is typical with neotectonics, the region with a higher heat flow is related with a lower Te. The seismicity does not have a clear relationship with Te, but the strong seismicity could cause a low Te. Seismogenic layer （Ts） has a similar trend as Te in the craton, whereas in other areas the relationship is complex.

关键词： South China Effective elastic thickness Spectrum estimation Heat flow Seismicity

南海共轭陆缘构造不对称性研究及其成因的数值模拟

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海洋科学 2014年第12期38卷 136-141页

作者：董冬冬钱进 marta pérez-gussinyé 卢志君栾奕中国科学院海洋研究所海洋地质与环境重点实验室山东青岛266071 Royal Holloway University of London 中国科学院大学北京100049

岩石圈在水平拉张力的作用下会发生伸展变形，以致形成裂陷盆地，但是在多因素的影响下，岩石圈的拉张形式会存在很大的差异，因此学者致力于提出不同模型解释不同的裂陷盆地结构。

关键词：数值模拟不对称性成因构造陆缘共轭南海裂陷盆地

相继断层作用解释共轭边缘的非对称性和伸展差异

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世界地震译丛 2017年第1期48卷 62-73页

作者： César R.Ranero marta pérez-gussinyé 刘见宝河南工程学院

早期伸展期间,冷的大陆岩石层变薄并发生沉降,形成裂谷盆地。如果继续拉伸并最终导致破裂,裂开的、大大减薄的板块便沉降至海平面以下深处,形成一对共轭的裂离边缘。尽管盆地和边缘是普遍存在的结构,但是从中等程度伸展的盆地到明显拉... 详细信息

早期伸展期间,冷的大陆岩石层变薄并发生沉降,形成裂谷盆地。如果继续拉伸并最终导致破裂,裂开的、大大减薄的板块便沉降至海平面以下深处,形成一对共轭的裂离边缘。尽管盆地和边缘是普遍存在的结构,但是从中等程度伸展的盆地到明显拉伸边缘的变形过程还不清楚,就像目前研究一致报道的那样,地壳减薄比由脆性断层作用引起的伸展要强烈1-4。该伸展差异可能起因于脆性地壳层和塑性地壳层的差异拉伸2,但是这不足以解释共轭边缘的典型非对称结构5,6——在剖面上,一侧边缘显示逐渐变薄,伴随着大断裂发育,而共轭的另一侧显示突然变薄,却伴随着小断裂发育5。裂陷早期开始活动的全地壳拆离,在理论上可以引起减薄和非对称1,但在机制上是有疑问的。此外,伸展差异在共轭边缘的两侧均有发生,导致外部形态的矛盾——两侧边缘均像拆离断层的上盘7,8。不同的模型认为,由于地震成像的限制,许多脆性伸展未被探测到,其原因或是地震分辨率难以识别的断裂9、基底顶部100km级别拆离面上不可见的变形8,或者是剖面上断裂组合的构造复杂性3。这里我们利用深度偏移地震成像准确地测量断层伸展,并将其与地壳减薄进行比较。利用观测资料建立了一种裂陷期运动学平衡模型,通过由裂陷盆地到非对称结构过程中断层控制的地壳减薄,和共轭裂离边缘的超级减薄解决了伸展差异。与现有的认识相比,观测资料支持这种观点:在地震资料上地壳减薄首先可由清晰可见的简单安德森断裂解释。

关键词：断层作用非对称性伸展共轭非对称结构地壳减薄裂谷盆地裂陷盆地

Multitaper spectral method to estimate the elastic thickness of South China: Implications for intracontinental deformation

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Multitaper spectral method to estimate the elastic thickness...

Multitaper spectral method to estimate the elastic thickness of South China: Implications for intracontinental deformation

中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Yangfan Deng Zhongjie Zhang Weiming Fan marta pérez-gussinyé State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Guangzhou Institute of Geochemistry Chinese Academy of Science Department of Earth Sciences Royal HollowayUniversity of London

The effective elastic thickness(Te) represents the thickness of the elastic layer or the flexural rigidity of the lithosphere, the equivalent of which can be calculated from the spectral analysis of gravity and topographic data. Studies of Te have profound in fluence on intracontinental deformation, and coupling of the tectonic blocks. In this paper, we use the multitaper spectral estimation method to calculate the coherence between Bouguer gravity and topography data, and to obtain the Te map of South China.Through the process of correction, we discuss the relationships of Te versus heat flow, and Te versus seismicity. The results show that Te distribution of South China is affected by three factors: the original age, which controls the basic feature;the Mesozoic evolution, which affects the Te distribution;and the neotectonic movement, which shaped the final distribution. The crust age has a positive correlation with the first-order Te distribution;thus the Yangtze Craton has a relatively higher Te(about 50 km) whereas the Te in Cathaysia block is only 10e20 km. By analysis and comparison among the tectonic models of South China, the Te distribution can be well explained using the flat-subduction model. As is typical with neotectonics, the region with a higher heat flow is related with a lower Te. The seismicity does not have a clear relationship with Te, but the strong seismicity could cause a low Te. Seismogenic layer(Ts) has a similar trend as Te in the craton, whereas in other areas the relationship is complex.

关键词： South China Effective elastic thickness Spectrum estimation Heat flow Seismicity

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Multitaper spectral method to estimate the elastic thickness...