Crustal structure and its tectonic implications in Sundaland and adjacent areas: Constraints from tele-seismic receiver functions
文献类型：期刊论文
| 作者 | Feng MingYe1,3; Chen Ling1,3; Wang Xu3; Wei ShengJi2; Wang Xin4 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 64期号:12页码:4364-4377 |
| 关键词 | Sundaland Receiver function Crustal thickness Crustal Vp/Vs ratio Continent-ocean transition |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg202100356 |
| 英文摘要 | The crustal structure in Sundaland, where the Eurasian, Indo-Australian and Pacific plates are converged, is of great importance to understanding the tectonic evolution of continent-ocean transitions and associated material recycling and energy exchange. In this study, we analyze the P-wave receiver function waveforms of 19 broadband seismic stations in Sundaland and apply the H-kappa stacking technique to estimate both crustal thickness and average V-p/V-s ratio. Different processing parameters are jointly employed to reduce the uncertainty of H-kappa estimation. We then combine previous results from 146 broadband stations to obtain the spatial variation of crustal thickness and V-P/V-s ratio, as well as their correlations. The results show that the average crustal thickness is about 32 km in Sundaland, obviously less than the global average beneath orogenic belts but close to that beneath extensional areas, suggesting that the crust in the region has been extended and thinned. A thicker crust with an average of 38 km, however, can be found beneath the Khorat plateau basin. In the volcanic arcs, the V-P/V-S ratio is significantly high (>1.81 and even >1. 87), spatially corresponding to the regions where low velocity layers appear within the crust, probably indicating the existence of partially molten materials. In non-volcanic areas, the crustal V-P/V-S ratios are generally less than 1.76, although relatively high V-P/V-S ratios (>1. 81 and even reach up to 1.99) appear in some local areas. Therefore, we infer that the crust is dominantly felsic in composition in Sundaland, but in some local areas, the crust is dominated by mafic composition or partial melting due to the underplating and upwelling of basaltic magma. P-wave receiver function waveforms present double or multiple peaks at the arrivals around the Ps and PPPS phases in midwestern Indochina, northwestern Borneo and middle Malay peninsula, where we speculate that the crust and mantle have interacted strongly with each other. We do not observe a clear correlation between the crustal thickness and V-P/V-S ratio for the whole Sundaland region, suggesting a complex regional variation in the crustal structures and composition. However, the negative correlations can be clearly found in both the Khorat plateau basin and volcanic areas in southeastern Indochina. According to the regional tectonics and various geophysical observations, we infer that the crust in Khorat plateau basin and its adjacent areas might be thickened during the extrusion of the Indochina terrane, and mantle upwelling may exist in southeastern Indochina, accounting for both the crustal extension and magmatic underplating. |
| WOS关键词 | H-KAPPA STACKING ; STRUCTURE BENEATH ; VELOCITY STRUCTURE ; CONTINENTAL-CRUST ; EVOLUTION ; THICKNESS ; STATIONS ; ASIA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000751863800011 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/104942]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Chen Ling |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Nanyang Technol Univ, Earth Observ Singapore, Singapore 639798, Singapore 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Feng MingYe,Chen Ling,Wang Xu,et al. Crustal structure and its tectonic implications in Sundaland and adjacent areas: Constraints from tele-seismic receiver functions[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2021,64(12):4364-4377. |
| APA | Feng MingYe,Chen Ling,Wang Xu,Wei ShengJi,&Wang Xin.(2021).Crustal structure and its tectonic implications in Sundaland and adjacent areas: Constraints from tele-seismic receiver functions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,64(12),4364-4377. |
| MLA | Feng MingYe,et al."Crustal structure and its tectonic implications in Sundaland and adjacent areas: Constraints from tele-seismic receiver functions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 64.12(2021):4364-4377. |
入库方式： OAI收割
来源：地质与地球物理研究所
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