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Crustal thickness and composition in the South China Block:Constraints from earthquake receiver function

Science China Earth Sciences 2022年第4期65卷 698-713页

作者： Changxin CHEN Qingtian LÜ Ling CHEN danian shi Jiayong YAN Yinshuang AI Chinese Academy of Geological Sciences Beijing 100037China Chinese MNR Laboratory of Deep Earth Sciences and Technology Beijing 100094China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

Crustal thickness and composition are closely related to geology and tectonic evolution of the *** the differences in the crustal thickness and composition of the South China Block(SCB)is important to gain a comprehensive understanding of multi-phase amalgamation,breakup,reworking,and regional geodynamic *** this study,teleseismic data from 135 high-density portable broadband stations from Sino Probe were processed using Common Conversion Point(CCP)stacking and H-κstacking *** Moho depth and P-wave and S-wave velocity ratio(V_(p)/V_(s))were *** results revealed several insights about the tectonic processes in the ***,the crustal structure and V_(p)/V_(s)ratios of the Cathaysia Block,Jiangnan Orogenic Belt,and Yangtze Block were significantly *** average depth of the Moho in the Cathaysia Block was approximately 31 km,and the V_(p)/V_(s)ratios increased from the inland area(1.66)to the coastal area(1.78),indicating the oceanward increase of mafic proportion in the lower crust,which is related to the influence of the Paleo-Pacific Plate westward ***,the crustal thickness of Jiangnan Orogenic Belt deepens from east ca.31 to the west ca.42 km and the V_(p)/V_(s)ratios varied from 1.75 to 1.64,illustrating a relatively felsic crust,which could have been related to the Mesozoic upper crustal thickening under compression followed by the lower crust removal under the extensional ***,the average crustal thickness of the Yangtze Block was 42 km,and the V_(p)/V_(s)ratios ranged from 1.64 to 1.84,presenting a positive correlation between the Moho depth and the V_(p)/V_(s)ratio,which is explained by the relatively thick mafic lower *** on the variations in the crustal structure and V_(p)/V_(s)ratios of the profile,we inferred that the central part of the Jiangnan Orogenic Belt was bounded by the Jiangshan-Shaoxing-Hengyang in the east and the Jiujiang-shitai-Jishou in the *** small-scale

关键词： P wave receiver function The South China Block Crustal thickness Crustal composition Block boundary

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Application of teleseismic tomography to the study of shallow structure beneath shizigou in the western Qaidam basin

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Earthquake Science 2009年第2期22卷 189-195页

作者： Xiaoming Xu Yinsheng Ma danian shi Xiaofeng Wang Chengming Yin Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China Research Institute of Petroleum Exploration andDevelopment Qinghai Oilfield Company PetroChina Dunhuang Gansu 736202 China

Teleseismic body wave traveltime tomography is used to inverse the three-dimensional seismic velocity structure beneath shizigou in the western Qaidam basin. The travel time are picked from the continuous observation data on a small seismic array of stations deployed during 2004-2007. The tomographic results obtained indicate that a NW-trending low velocity anomaly just beneath the target region insert northeastwards with a high dip angle. In the north, northeast and east of the low velocity anomaly, some high-velocity anomalies distribute with the same strike and coverage as those of shizigou anticline.

关键词： Qaidam basin velocity structure traveltime residuals teleseismic tomography

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New Insights into the Mesozoic Large-scale Intra-plate Magmatism and Mineralization in South China from Seismic Tomography

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1243-1251页

作者： shi danian LÜQingtian SHEN Yang XU Xiaoming ZHANG Yongqian XU Yao ZHAO Jinhua GU Yumin shi Jianyu CHEN Changxin SinoProbe Laboratory Chinese Academy of Geological SciencesBeijing 100037China University of Rhode Island KingstonRhode IslandUSA Institute of Geophysics China Earthquake AdministrationBeijing 100081China National Marine Environmental Forecasting Center Beijing 100081China

A great amount of new S-wave data has been combined to image the mantle structure down to lower mantle depth near the southeastern margin of Eurasia and understand the tectonics in South China since the *** results reveal a large-scale structure beneath the South China Sea,with a prominent,broad low-velocity feature of at least 1500-km wide in and below the mantle transition zone(MTZ)and a pronounced low-velocity feature of nearly 500-km wide in the lowermost *** these features may represent the head-and-tail of an upwelling mantle plume that has interacted with and deformed by the subducting plates in the *** Andaman-Sumatra plate is seen subducting steeply without stagnation in the MTZ over the large-scale low-velocity structure,suggesting that the upwelling mantle may have exerted significant influence on the overlying plate *** results suggest a long-term extensional regime near the southeastern margin of Eurasia,which may help to understand the formation of the large-scale intra-plate magmatism and mineralization with accumulation of huge amount of rare metal elements in South China during the Mesozoic,and the continental breakup,the southeastward extrusion of Indochina,and the opening of the South China Sea during the Cenozoic.

关键词： seismic tomography intra-plate tectonics mantle dynamics South China

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The Lithosphere Structure and its Implication for Different Metallogenic Belts beneath the Eastern South China Block

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Acta Geologica Sinica(English Edition) 2024年第S01期98卷 2-5页

作者： CHEN Changxin LÜQingtian CHEN Ling shi danian YAN Jiayong AI Yinshuang Chinese Academy of Geological Sciences Beijing 100037China SinoProbe Center Chinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China China MNR Lab of Deep Earth Science and Technology Beijing 100094China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The South China Block(SCB)was formed through the Neoproterozoic amalgamation of the Yangtze Block(YB),the Cathaysia Block(CB),and the accreted components of the Jiangnan orogenic belt(JNO),it is bounded by the Jiangshan–Shaoxing–Pingxiang fault(JSPF)and the Jiujiang–shitai–Jishou fault(JSJF)(Yao et al.,2019).The SCB has undergone a series of complex geological events,including Paleozoic orogeny,Mesozoic collisions with the North China Craton(NCC)and the Indochina Block,as well as the intracontinental orogeny,leading to extensive lithospheric modifications and magmatic activities(Zhang H J et al.,2023;Fig.1).

关键词： lithosphere structure receiver function mineral system South China Block

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The Lithospheric Structure in the South China Block from Receiver Function: Implications for the Source of Mineral System

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Acta Geologica Sinica(English Edition) 2021年第S01期95卷 28-30页

作者： CHEN Changxin LV Qingtian CHEN Ling shi danian YAN Jiayong AI Yinshuang Chinese Academy of Geological Sciences Beijing 100037China SinoProbe Center Chinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The South China block(SC),composed of Cathaysia(CA),Jiangnan Orogenic belt(JNB),and Yangtze block(YB),is one of the most important poly-metallic metallogenic provinces in the world(Zhang et al.,2013),containing of fou... 详细信息

关键词： receiver function South China block lithosphere structure mineral system sources material

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A Gravity Forward Modeling Method based on Multiquadric Radial Basis Function

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Acta Geologica Sinica(English Edition) 2021年第S01期95卷 62-64页

作者： LIU Yan LV Qingtian HUANG Yao shi danian MENG Guixiang YAN Jiayong ZHANG Yongqian China Deep Exploration Center-SinoProbe Center Chinese Academy of Geological SciencesBeijing 100037China China University of Geosciences Wuhan 430074China

It is one of the most important part to build an accurate gravity model in geophysical *** gravity modelling is usually based on grid method,such as difference method and finite element method widely *** to self-adapt... 详细信息

关键词： geophysical exploration gravity forward modeling mesh-free method radial basis function

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Underplating in the middle-lower Yangtze Valley and model of geodynamic evolution:Constraints from geophysical data

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Science China Earth Sciences 2005年第7期48卷 985-999页

作者： Lü Qingtian, HOU Zengqian, YANG Zhusen & shi danian Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China Institute of Mineral Resources Chinese Academy of Geoloqical Sciences Beijina 100037 China

The lower crust and Moho are the most active boundary layers in the process of continental evolution, in which marks left by tectonic and magmatic activities during the process are preserved. The evolutionary process of the continental lithosphere may be reconstructed by exploring the structures of the lower crust and Moho. According to a study of the deep seismic reflection data obtained from the middle-lower Yangtze Valley, the authors find bright layered reflections ubiquitous in the lower crust and think that the bright reflections are caused by un-derplating of basic or ultrabasic magmas, which might be related to delamination of the lithosphere. On the basis of an integrated analysis of the geophysical and geological data of the region, the authors propose a model for geodynamic evolution of the middle-lower Yangtze Valley. This model suggests that the middle-lower Yangtze Valley had undergone such geodynamic processes as collision-compression, delamination-extension and underplating-melting since the end of the Permian, finally forming the gigantic middle-lower Yangtze Valley metallogenic belt.

关键词： lower crust deep seismic reflection underplating tectonic evolution.

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Shear Wave Anisotropy of the Upper Mantle Beneath the Region from Tingri of Tibet to Golmud of Qinghai

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Acta Geologica Sinica(English Edition) 1997年第2期71卷 144-151页

作者： shi danian Dong Yingun Jiang Mei Zhao Hong Georges Poupinet Alfred Hirn and Alexandre Nercessian Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing China Laboratoire de Geophysique Interne et Tectonophysique, Grenoble, France Laboratoire de Seismologie Experimentale, IPG, CNRS, Paris, France

Measurements of shear wave splitting at 43 three-component seismic stationsshow very big difference in anisotropy on both sides of the Indus-Yarlung Zangbo suture(ITS), but little difference on both sides of the older Bangong-Nujiang suture (BNS) and theJinsha River suture (JS) to its north. Obvious discrepancy exists between the anisotropy direc-tion and the superficial tectonic trends, which is not explicable directly by the coherent uppermantle deformation usually supposed to occur in consistency with the trend of a collisional *** the other hand, strong spatial relationships are observed from the anisotropy results, such asthe orthogonal directions of anisotropy on both sides of ITS and the good correlation betweenthe region of larger magnitude of anisotropy and the zone of inefficient Sn propagation ofQiangtang as well as the systematic rotation of the directions of anisotropy, which should testifysome much more complicated aspects of the continental convergence mechanism. To the best ofour data, we tend to suppose that the Qinghai-Tibet plateau might result from a mechanismcomplicated by the coexistence of Argand's underthrusting and Dewey's diffuse deformation.

关键词： Qinghai-Tibet plateau continental evolution seismology shear wave splitting anisotropy

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东昆仑造山带中地壳存在古洋壳俯冲的深反射地震证据

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地质学报 2016年第8期90卷 1692-1702页

作者：刘志伟赵文津吴珍汉史大年中国地质科学院北京100037 中国地质科学院矿产资源研究所北京100037

INDEPTH Ⅳ深反射地震测线横跨可可西里-巴颜喀拉地块和东昆仑-柴达木地块,为揭示青藏高原东昆仑造山带深部构造提供了直接地球物理证据。针对地表和地下"双复杂"地质构造条件,地震数据处理中通过剩余折射波静校正技术、异常振幅噪声衰... 详细信息

INDEPTH Ⅳ深反射地震测线横跨可可西里-巴颜喀拉地块和东昆仑-柴达木地块,为揭示青藏高原东昆仑造山带深部构造提供了直接地球物理证据。针对地表和地下"双复杂"地质构造条件,地震数据处理中通过剩余折射波静校正技术、异常振幅噪声衰减技术和CRS优化叠加技术,获得了较高信噪比的地震反射叠加剖面。INDEPTH Ⅳ深反射地震剖面揭示,在东昆仑造山带岩石圈上、下地壳之间存在不连续的古洋壳反射同相轴,该反射界面应属古特提斯域松潘-甘孜洋壳向北俯冲遗迹,不连续特征反映中生代东昆仑-柴达木地块南缘属于被动大陆边缘碰撞带。利用INDEPTH Ⅳ深反射地震单炮、速度和叠加剖面等成果,综合解译数据,提出东昆仑造山带隆升过程的另一种模式,以助于深化东昆仑造山模式认识。

关键词：深反射地震东昆仑造山带松潘-甘孜洋壳 INDEPTH IV

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可可西里岩石圈向北俯冲到柴达木地幔的地震学证据

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地球物理学报 2020年第8期63卷 2940-2953页

作者：赵荣涛赵文津史大年刘志伟杨艳中国地质科学院北京100037

利用中美德INDEPTH IV合作项目2007—2009年间布置于青藏高原中、北部140个宽频地震台站记录到的天然地震数据,经过接收函数成像处理,获得了3条穿过昆仑—阿尼玛卿缝合带清晰的壳幔结构图像.结果显示柴达木南缘莫霍面位于约50 km深度,... 详细信息

利用中美德INDEPTH IV合作项目2007—2009年间布置于青藏高原中、北部140个宽频地震台站记录到的天然地震数据,经过接收函数成像处理,获得了3条穿过昆仑—阿尼玛卿缝合带清晰的壳幔结构图像.结果显示柴达木南缘莫霍面位于约50 km深度,羌塘地块、可可西里地块、东昆仑造山带莫霍面位于约65 km深度,昆仑—阿尼玛卿缝合带以北约50 km存在莫霍面深度突变.在可可西里和柴达木岩石圈地幔之间观测到北倾界面,这可能是可可西里岩石圈向北俯冲到柴达木地幔之下的证据.可可西里地块地壳内宽缓的负转换震相带是低速带的反映,其向北挤入到东昆仑山下发生挤压增厚,可能是东昆仑山隆升的原因;由于刚性柴达木岩石圈的阻挡,物质向东改向,则可能是该地区向东旋转的构造应力场产生的原因.本文研究结果不支持亚洲岩石圈地幔在东昆仑—柴达木交界处向南俯冲,据此,我们提出了新的东昆仑造山模式.

关键词：东昆仑山 P波接收函数成像可可西里地块地幔岩石圈造山模式

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