• 责任者：Chen Ninghua (Department of Earth Sciences ; Zhejiang University ; Hangzhou 310027 ; China) ; Dong Jinjin
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：岩墙群 ; dyke swarms ; 伸展构造 ; extension tectonics ; 新疆 ; Xinjiang
• 页码：p.3540-3546
• 图表：3 illus., 2 tables, 47 refs.
• 分类号：0300
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The geology of Beishan area in Xinjiang, Northwest China is characterized by numerous Late Paleozoic intrusive rocks, and widespread mafic dyke swarms, which indicate continental lithospheric extensional events. This work focused on using multisouree high-resolution remote sensing images （ETM ＋ , SPOT, CORONA KH4B, Geoeyel and Quickbird2） to extract the geometric features of mafic dykes and estimate the Permian crustal extension of this area. 1375 dykes were extracted from the area about 26880km2. The spatial distribution of the dyke density and crustal extension are obtained based on the statistics of 1375 extracted marie dykes. The results show that NNW-NNE-trending dykes dominate. The length and thickness distributions of dykes follow statistical laws with negative exponent. The maximum length of individual dyke is about 34km, the mean length is about 5km, and the maximum and mean dyke thicknesses are 31m and 7.9m, respectively. The crustal extension of the area ranges from 0. 59% ～ 2. 01%. From south to north, the dilation decreases gradually. The crustal extension in the intrusive rock is as high as 8.32%0. In sedimentary and metamorphic rock areas, the crustal extension only ranges from 0. 05% ～0. 3%. The Permian mafic dyke swarms have a close spatial relationshin with intrusive rocks, meanwhile, are controlled and transformed by regional faults.