Distribution of the crustal magnetic anomaly and geological structure in Xinjiang, China
Distribution of the crustal magnetic anomaly and geological structure in Xinjiang, China
复制标题
中国新疆地壳磁异常分布及地质结构
DOI：
10.1016/j.jseaes.2013.08.014
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发表时间：
2013-11-15
影响因子：
3
通讯作者：
Li, Guangquan
中科院分区：
文献类型：
--
作者：
Gao, Guoming;Kang, Guofa;Li, Guangquan
基于NGDC-720-V3高阶地壳磁场模型，研究了新疆地区地壳磁异常的分布、衰减特征及其与地质构造的关系。通过居里等温面，用功率谱方法研究了磁性层基底的形貌。结果表明，塔里木盆地南部、准噶尔盆地、吐哈盆地具有较强的正磁异常，西昆仑山、阿尔金山、天山、阿尔泰山具有较弱或负磁异常。磁异常较好地反映了区域构造结构，三座交替的山脉，中间夹着两个盆地。塔里木盆地地表磁异常与基性岩墙有较好的对应关系。磁异常随海拔高度的衰减表明，新疆是一个由多个大小不等、方向不同的磁块体组成的大磁区。居里面呈现出山下浅、盆下深的特征，与莫霍面深度大致呈反镜像对应关系。(C)2013爱思唯尔有限公司保留所有权利。
Based on the high-order crustal magnetic field model NGDC-720-V3, we investigate the distribution of crustal magnetic anomaly, the decay characteristics of the anomaly, and the relationship between the magnetic anomaly and geological structure in Xinjiang, China. Topography of the magnetic layer basement is studied through Curie isothermal surface using the power spectrum method. It is found that south Tarim Basin, Junggar Basin, and Turpan-Hami Basin have strong positive magnetic anomaly, whereas west Kunlun Mountain, Altun Mountain, Tianshan Mountain, and Altai Mountain have weak or negative anomaly. The magnetic anomaly well reflects the regional tectonic structure, i.e., three alternating mountains intervened by two basins. The magnetic anomaly on the ground surface in Tarim Basin is well corresponding to the mafic dykes. The decay of the magnetic anomaly with altitude indicates that Xinjiang is a large massif composed of several magnetic blocks with different sizes in different directions. The Curie surface presents a feature of being shallow under mountains whereas being deep under basins, roughly having an anti-mirror correspondence with the Moho depth. (C) 2013 Elsevier Ltd. All rights reserved.