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阿拉善地块西南缘的早前寒武纪变质基底主要分布在内蒙古阿拉善右旗与甘肃河西走廊相交界的龙首山—北大山地区,在大地构造上该区是华北克拉通、塔里木克拉通和祁连造山带3个地体的交汇处,因此长期以来备受关注。笔者综合了近十年来中外地质学家对阿拉善地块早前寒武纪地质的研究成果,对已取得的资料成果进行分析整理,从岩石单元划分、年代学、构造边界及大地构造归属4个方面进行论述,总结了近年来对以龙首山岩群为代表的阿拉善地块西南缘早前寒武纪变质基底的研究进展,提出目前争议性较大的问题,并探讨今后进一步研究的方向。
The Early Precambrian metamorphic basement in the southwestern margin of the Alxa Block is mainly located in the Longsashan-Beidashan area, where the Alxa Right Banner of Inner Mongolia and Gansu Hexi Corridor intersect with each other. In the tectonic framework, the area is the north China’s craton, Tong and the Qilian orogenic belt at the intersection of three terrain, it has long been a concern. Based on the research results of geologists in the past ten years in the Alxa block, the author summarizes the results of the data obtained from the early Precambrian geology, from the division of rock units, chronology, tectonic boundaries and tectonic belts 4 This paper summarizes the research progress of the Early Precambrian metamorphic basement on the southwestern margin of the Alxa Block represented by the Longsoshoushan Group in recent years, puts forward the current controversial issues and discusses further research in the future The direction of