Remnants of the amalgamation of the east and west Cathaysia blocks revealed by a short-period dense nodal array
作者机构：Guangdong Provincial Key Laboratory of Geodynamics and GeohazardsSchool of Earth Sciences and EngineeringSun Yat-Sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China
出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)
年 卷 期：2023年第14卷第1期
页 面：207-214页
核心收录：
学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学]
基 金：the National Natural Science Foun-dation of China(Grant Nos.41874052 and 41730212) the Guangdong Province Introduced Innovative R&D Team(Grant No.2017ZT072066) the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2019QZKK0701) the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant No.311021002) the Guangdong Collaborative Innovation Center for Earthquake Prevention and Mitigation(Grant No.2018B020207011)
主 题：Dense short-period nodal array Teleseismic receiver function Cathaysia block Offset Moho High V_(p)/V_(s)ratio
摘 要：The Cathaysia block located at the southeast South China block(SCB)is considered formed by the amalgamation of the east and west Cathaysia blocks along the Gaoyao-Huilai and Zhenghe-Dapu deep faults(here referred as GHF and ZDF,respectively).Although the extension of the ZDF to the northeast,which represents the amalgamation of the two sub-blocks has been confirmed,the development of the GHF to the southwest remains to be *** better constrain the detailed deep structure beneath the southwest Cathaysia,which hold great significance for revealing the evolution of the SCB,a linear seismic array with 331 nodal geophones was deployed across the Sanshui basin(SSB).Combining with the regional 10 permanent stations(PA),we obtained two profiles with teleseismic P-wave receiver function *** most obvious feature in our results is the ascending Moho towards the coastal area,which is consistent with the passive margin continental and extensional tectonic *** stacking profile from the dense nodal array(DNA)shows that the Moho is offset beneath the transition zone of the Nanling orogeny and *** deduce that this offset may be casued by the deep extension of the GHF,which represents the remnants of the amalgamation of the Cathaysia *** the other evidences,we infer that the widespread and early erupted felsic magmas in the SSB may have resulted from lithospheric materials that were squeezed out to the *** relative higher Bouguer gravity and heat flow support the consolidation of magmas and the residual warm state in the shallow crustal scale beneath the *** sporadic basaltic magmas in the middle SSB may have a close relation to deep extension of the GHF,which serves as a channel for upwelling hot materials.
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