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引用本文:牛树银1,2 孙爱群1 马宝军1 张建珍1 毛景文3 李厚民3 王宝德1 陈 超1. 华北东部地幔热柱的特征与演化[J]. 中国地质, 2010, 37(4): 931-942.
NIU Shu-yin1,2, SUN Ai-qun1, MA Bao-jun1, ZHANG Jian-zhen1, MAO Jing-wen3, LI Hou-min3, WANG Bao-de1, CHEN Chao1. Characteristics and evolution of the mantle plume in eastern North China[J]. Geology in China, 2010, 37(4): 931-942(in Chinese with English abstract).
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华北东部地幔热柱的特征与演化
牛树银1,2 孙爱群1 马宝军1 张建珍1 毛景文3 李厚民3 王宝德1 陈 超11,2,3
1.石家庄经济学院, 河北 石家庄 050031;2.中国地质大学(北京),北京 100029;3.中国地质科学院矿产资源研究所,北京 100037
摘要:
提要:燕山运动以来,华北东部地区发生了翻天覆地之构造转变,构造体制从印支期末华北地块与扬子地块的拼贴-增生,转变为地幔热柱演化-区域伸展断陷。华北地幔热柱强烈上隆过程中,在岩石圈底部受阻并呈蘑菇状向外拆离流变,在使上部岩石圈发生热减薄-断陷的同时,向外拆离流变的地幔岩在盆地外围受到韧性剪切带的切割,导致深熔岩浆活动并带动围岩上隆,形成一系列次级隆起(幔枝构造)。地形地貌上亦从东部隆起的高原转变为一盆多山耦合格局——地幔热柱上部的热减薄断(拗)陷与外围的一系列幔枝构造的空间有机组合,即华北东部裂陷盆地西与太行造山带、北与燕山造山带、东与朝鲜半岛、南与大别造山带(即中心裂陷盆地与外围各幔枝构造)均为盆-山耦合关系。
关键词:  幔壳运动  地幔热柱  幔枝构造  伸展构造  构造演化
DOI:
分类号:
基金项目:国家自然科学基金(40872137 )、我国典型金属矿科学基地研究(200911007)、河北省自然科学基金(D2007000751、D2008000534)项目资助。
Characteristics and evolution of the mantle plume in eastern North China
NIU Shu-yin1,2, SUN Ai-qun1, MA Bao-jun1, ZHANG Jian-zhen1, MAO Jing-wen3, LI Hou-min3, WANG Bao-de1, CHEN Chao11,2,3
1.Shijiazhuang University of Economics, Shijiazhuang 050031, Hebei, China;2. China University of Geosciences, Beijing 100029, China;3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract:
Abstract:Since the Yanshanian movement, enormous tectonic transformation has taken place in eastern North China. The tectonic pattern transformed from the conjunction-enlargement between North China platform and Yangtze platform in the end of Indosinian movement to the evolution of mantle plume and regional extensional faulting. In the process of North China mantle plume uplifting, the plume was blocked by the bottom of the lithosphere and mushroomed outwards. With the thinning and faulting of the lithosphere, detached plastic mantle rocks were cut by the ductile shearing zone in the surrounding areas of the basin, which resulted in anatectic magmatism. The anatectic magmatism drove the uplifting of country rocks and formed a series of secondary uplifts (mantle branches). Then the landform in eastern North China transformed from high plateau into a coupling pattern of one basin with multiple mountains——a spatial pattern of heat thinning fault basin on the top of the mantle plume with a series of surrounding mantle branches. The faulting basin in eastern North China is coupled westward with Taihang orogenic belt, northward with Yanshan orogenic belt, eastward with Korean peninsula, and southward with Dabieshan orogenic belt (central fault basin with surrounding mantle branches).
Key words:  mantle-crust movement  mantle plume  mantle branch  extension structure  tectonic evolution