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引用本文:徐峣,张永谦,严加永,徐志伍,陈昌昕. 华南东南部上地幔远震P波速度结构及意义[J]. 中国地质, 2019, 46(4): 737-749.
XU Yao,ZHANG Yongqian,YAN Jiayong,XU Zhiwu,CHEN Changxin. Teleseismic P-wave velocity structure of upper mantle beneath the southeastern part of South China and its implications[J]. Geology in China, 2019, 46(4): 737-749(in Chinese with English abstract).
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华南东南部上地幔远震P波速度结构及意义
徐峣1,2,3, 张永谦1,2,3, 严加永1,2,3, 徐志伍1,2, 陈昌昕1,2
1.中国地质科学院, 北京 100037;2.中国地质调查局-中国地质科学院地球深部探测中心, 北京 100037;3.中国地质科学院矿产资源研究所, 北京 100037
摘要:
本研究利用114个固定台站记录的121个远震事件,以钦杭结合带为中心,采用天然地震层析成像构建了华南东南部上地幔P波速度结构模型。研究结果表明:(1)钦杭结合带、武夷成矿带以及南岭成矿带的深部结构存在着差异,说明3个成矿带经历了不同的构造演化过程;(2)江绍断裂的上地幔中存在着低速异常,推测该低速异常为从地幔过渡带或者下地幔上涌的热物质,与钦杭结合带和武夷成矿带的成矿作用有着密切的关系;(3)下扬子地区上地幔底部的高速异常可能为拆沉的岩石圈,而华夏板块上地幔顶部的高速异常则有待进一步研究。本研究的结果为认识华南东南部的深部结构提供了新的证据。
关键词:  华南东南部  钦杭结合带  天然地震层析成像  上地幔速度结构  速度异常  深部资源工程
DOI:10.12029/gc20190405
分类号:P631.4
基金项目:中国地质调查局地质调查项目(DD20160082,DD20190012)、国家重点研发计划(2016YFC0600201)、国家自然科学基金(41574082)中国地质科学院基本科研业务费(K1609)联合资助。
Teleseismic P-wave velocity structure of upper mantle beneath the southeastern part of South China and its implications
XU Yao1,2,3, ZHANG Yongqian1,2,3, YAN Jiayong1,2,3, XU Zhiwu1,2, CHEN Changxin1,2
1.Chinese Academy of Geological Sciences, Beijing 100037, China;2.SinoProbe Center, Chinese Academy of Geological Sciences and China Geological Survey, Beijing 100037, China;3.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract:
This paper determined a P-wave velocity structure of upper mantle beneath the southeastern part of South China, with the emphasis placed on the Qinhang Joint Belt, by using 121 teleseismic events received by 114 permanent seismic stations. The results show that:(1) the deep structures of the Qinhang Joint Belt, the Wuyi Metallogenic Belt and the Nanling Metallogenic Belt are different, suggesting that the tectonic processes of the three metallogenic belts are also different; (2) there exists a low velocity anomaly in the upper mantle beneath the Jiangshao Fault, suggesting that the upwelling of thermal flow probably originated from mantle transition zone or lower mantle, and might have been closely related to the mineralization in the Qinhang Joint Belt and the Wuyi Metallogenic Belt; (3) the high velocity anomaly at the bottom of the upper mantle beneath the Yangtze Block is probably the detached lithosphere; however, the high velocity anomaly beneath the Cathaysia Block should be further studied. These results provide new evidence for understanding deep structure about the southeastern part South China.
Key words:  the southeastern part of South China  Qinhang Joint Belt  seismic tomography  velocity structure of upper mantle  velocity anomaly  deep resources engineering