地球物理学进展 ›› 2014, Vol. 29 ›› Issue (1): 102-109.doi: 10.6038/pg20140113

• 院士论坛 • 上一篇    下一篇

用深反射大炮对大巴山-秦岭结合部位的地壳下部和上地幔成像

李洪强1,2, 高锐1,2, 王海燕1,2, 李文辉1,2, 卢占武1,2, 侯贺晟1,2, 熊小松1,2   

  1. 1. 国土资源部深部探测与地球动力学重点实验室, 北京 100037;
    2. 中国地质科学院地质研究所, 北京 100037
  • 收稿日期:2013-10-10 修回日期:2014-01-04 出版日期:2014-02-20 发布日期:2014-02-20
  • 通讯作者: 高锐,男,研究员,长期从事深部地球物理探测与地球动力学研究.(E-mail:gaorui@cags.ac.cn) E-mail:gaorui@cags.ac.cn
  • 作者简介:李洪强,男,博士研究生,主要从事深地震反射资料处理解释研究.(E-mail:hongqiangli@126.com)
  • 基金资助:
    深地震反射剖面实验与地壳结构研究项目(201011040,201311154), 中国地质调查局地质调查工作项目(工作编码1212011220260).

Imaging the lower crust and upper mantle beneath between Qinling and Dabashan by big shots from deep seismic reflection in China

LI Hong-qiang1,2, GAO Rui1,2, WANG Hai-yan1,2, LI Wen-hui1,2, LU Zhan-wu1,2, HOU He-sheng1,2, Xiong Xiao-song1,2   

  1. 1. Key laboratory of Earthprobe and Geodynamics, CAGS, Beijing 100037, China;
    2. Lithosphere Research Center, Institute of Geology, CAGS, Beijing 100037, China
  • Received:2013-10-10 Revised:2014-01-04 Online:2014-02-20 Published:2014-02-20

摘要: 根据近垂直反射原理对秦岭和大巴山结合部位的深地震反射测线上的5个大药量的反射大炮进行静校正、去噪、速度求取、CDP分选等处理获得沿深地震反射测线的大炮单次覆盖剖面.单次剖面和原始单炮数据结果初步显示:深地震反射测线最南端TWT 16 s处存在地幔反射, 该地幔反射界面向北可以追踪到凤凰山下TWT 18.5 s.地幔反射在原始大炮数据表现为信噪比较高的连续震相. 莫霍面反射在凤凰山南10 km, TWT在 16 s, 从该处向南莫霍面震相难以识别, 不能追踪;从该处向北, 莫霍面反射可连续追踪, 界面变化平缓、南深北浅, 在测线最北端莫霍面反射TWT 14.2 s.初步认为测线最南端的地幔反射为扬子板块向北俯冲证据.

Abstract: Static、denoise、velocity analysis、CDP sorting and other techniques are applied to process five high S/N big shots from deep seismic reflection in Qinling to obtain a single fold profile. The Preliminary results reveal that the Mantle reflection of TWT appear at 16 s in the southernmost of deep seismic single fold profile. The Mantle reflection can track in succession and deepen gradually from south to Fenghuang mountain, the TWT of mantle reflection under Fenghuang mountain appear at 18.5 s. The Moho reflection located at TWT 16s and ten kilometers to Fenghuang, Although The Moho reflection is very ambiguity and hard to identify from Fenghuangshan to southernmost of deep seismic profile in Qinling,it can be tracked to the northernmost of deep seismic profile,the TWT at 14.2 s.

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