华北克拉通东北部及邻区地壳和地幔转换带厚度研究

王炳瑜, 陈凌, 艾印双, 何玉梅. 华北克拉通东北部及邻区地壳和地幔转换带厚度研究[J]. 地球物理学报, 2013, 56(1): 60-68, doi: 10.6038/cjg20130107
引用本文: 王炳瑜, 陈凌, 艾印双, 何玉梅. 华北克拉通东北部及邻区地壳和地幔转换带厚度研究[J]. 地球物理学报, 2013, 56(1): 60-68, doi: 10.6038/cjg20130107
WANG Bing-Yu, CHEN Ling, AI Yin-Shuang, HE Yu-Mei. Crustal structure and mantle transition zone thickness beneath the northeastern area of the North China Craton and adjacent region[J]. Chinese Journal of Geophysics (in Chinese), 2013, 56(1): 60-68, doi: 10.6038/cjg20130107
Citation: WANG Bing-Yu, CHEN Ling, AI Yin-Shuang, HE Yu-Mei. Crustal structure and mantle transition zone thickness beneath the northeastern area of the North China Craton and adjacent region[J]. Chinese Journal of Geophysics (in Chinese), 2013, 56(1): 60-68, doi: 10.6038/cjg20130107

华北克拉通东北部及邻区地壳和地幔转换带厚度研究

详细信息
    作者简介:

    王炳瑜,男,1987年出生,硕士生,主要从事地幔转换带结构研究.E-mail:bywang77@gmail.com

  • 中图分类号: P315

Crustal structure and mantle transition zone thickness beneath the northeastern area of the North China Craton and adjacent region

  • 本文利用宽频流动台阵记录的远震波形资料和接收函数波动方程叠后偏移方法,获得了华北克拉通东北部边界及其邻近地区的地壳和地幔转换带的间断面结构图像.结果显示研究区域的地壳厚度存在显著的横向变化:以南北重力梯度带为界,西北部的兴蒙造山带地壳较厚(~40 km),东南部的燕山带、松辽盆地和辽东台隆地壳明显较薄(30~35 km).这有可能反映,研究区南北重力梯度带两侧地壳在中-新生代区域构造伸展过程中经历了不同程度的改造和减薄.地幔转换带成像结果显示,研究区410 km和660 km间断面结构存在横向差异.经度121°E-122°E之间,上地幔底部出现双重间断面,深度分别为660 km和690 km.经度122.5°E以东(北黄海地区),410 km间断面有5~20 km幅度的下沉,660 km间断面有5~15 km幅度的抬升;该地区地幔转换带厚度相对全球平均偏薄10~20 km,指示着该地区较热的上地幔底部温度环境.我们认为太平洋俯冲板块可能停滞在研究区119°E-122°E经度范围的地幔转换带中,但未延伸至118°E以西;而俯冲板块在124°E以东可能局部穿透了上地幔底部而进入下地幔,同时引起小尺度的地幔对流,导致北黄海地区下地幔物质的上涌.
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出版历程
收稿日期:  2012-04-21
修回日期:  2012-12-25
上线日期:  2013-01-20

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