| 北山造山带古生代蛇绿混杂岩研究现状及进展 |
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| 引用本文： | 王国强,李向民,徐学义,余吉远,武鹏,计波.北山造山带古生代蛇绿混杂岩研究现状及进展[J].地质通报,2021(1). |
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| 作者姓名： | 王国强 李向民 徐学义 余吉远 武鹏 计波 |
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| 作者单位： | 中国地质调查局西安地质调查中心;中国地质调查局造山带地质研究中心;西北地质科技创新中心;中国地质调查局自然资源航空物探遥感中心 |
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| 基金项目： | 国家自然科学基金项目《甘肃北山泥盆纪高镁安山岩岩石成因及其地球动力学意义》(批准号:41703038);中国地质调查局项目《北山图拉尔根—辉铜山地区区域地质调查》(编号:DD20190812)。 |
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| 摘 要： | 蛇绿混杂岩带作为造山带最重要的组成部分之一,其形成和就位过程与区域造山事件密切相关。通过系统梳理北山造山带蛇绿混杂岩的研究现状及存在问题,认为在北山造山带内卷入的4条蛇绿混杂岩带中,红柳河-牛圈子-洗肠井蛇绿混杂岩带为形成时代最古老的蛇绿岩,代表了北山洋盆最早于早寒武世即已开启,北山地区发育的洋盆最晚可能于二叠纪闭合,构造属性研究表明,已发现的各蛇绿混杂岩带单独作为一级构造单元划分的证据依然不足。以客观表达目标地质体为主的北山各蛇绿岩带的地质调查程度制约了蛇绿岩的识别、形成、就位时代、各洋盆之间演化关系及构造属性等问题的研究,建议未来区内的深入研究及解决热点问题时应采取如下关键手段:开展各蛇绿混杂岩带大比例尺的精细基础地质调查工作。
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| 关 键 词： | 蛇绿岩 构造演化 形成时代 古生代 北山造山带 |
Research status and progress of Paleozoic ophiolites in Beishan orogenic belt |
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| WANG Guoqiang,LI Xiangmin,XU Xueyi,YU Jiyuan,WU Peng,JI Bo.Research status and progress of Paleozoic ophiolites in Beishan orogenic belt[J].Geologcal Bulletin OF China,2021(1). |
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| Authors: | WANG Guoqiang LI Xiangmin XU Xueyi YU Jiyuan WU Peng JI Bo |
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| Institution: | (Xi’an Center of China Geological Survey,Xi’an 710054,Shaanxi,China;Center for Orogenic Belt Geology,CGS,Xi’an 710054,Shaanxi,China;Northwest China Center for Geoscience Innovation,Xi’an 710054,Shaanxi,China;China Aero Geophysical Survey and Remote Sensing Center for Natural Resource,Beijing 100083,China) |
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| Abstract: | As one of the most important parts of orogenic belt,the formation and emplacement of the ophiolitic mélange belt is closely related to regional orogenic events.Four ophiolitic mélanges belts are involved in the Beishan orogenic belt,of which the Hongliuhe-Niujuanzi-Xichangjing ophiolitic mélange belt is the oldest one,indicating that the Bishan Ocean was opened as early as Early Cambrian,and might be closed in Permian at the latest.The study of tectonic affinity also shows that the evidence for the division of the discovered ophiolitic mélange zones as the first-scale tectonic unit is still insufficient.Because the identification,formation,emplacement age of ophiolites and evolution of various ocean basins,as well as their tectonic properties are restricted by objective expression about geological survey of Beishan ophiolite belts,it is suggested that one of the key means to further study and solve hot issue in the area in the future is to pay attention to the large scale fine basic geological survey of each ophiolite belt. |
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| Keywords: | ophiolite tectonic evolution formation age Paleozoic Beishan orogenic belt |
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