摘要
南蒙古晚古生代华力西造山带在中亚造山带中有着极其重要的地位,但受各种因素制约,其碰撞形成时间问题一直存在较大争议。本文收集利用前人的有关岩石地球化学资料,初步总结了南蒙古地区晚古生代岩浆岩的地球化学特征,提出该区泥盆纪开始形成岛弧,早石炭世仍以岛弧为主,但出现了陆缘弧,而晚石炭世则更多的代表为板内岩浆作用,此时南蒙古地区与俯冲相关的岛弧岩浆作用基本停止并转入板内构造阶段,二叠纪时期板内特征更加明显,这时弧火山活动已经停止,这与中亚造山带进入拼合阶段相关,为板内构造环境。如此本文可为南蒙古地区晚古生代构造演化研究提供一些有意义的参考。
The late Paleozoic Variscan orogenic belt in southern Mongolia plays an important role in the Central Asia orogenic belt,but the formation time of the collision has been controversial due to various factors.In this paper,the geochemical characteristics of the late Paleozoic magmatic rocks in southern Mongolia are preliminarily summarized by collecting and using the previous geochemical data.It is suggested that island arc began to form in Devonian in this area,and island arc was still dominant in Early Carboniferous,but continental margin arc appeared,while intraplate magmatism was more typical in Late Carboniferous.At this time,island arc magmatism related to subduction in southern Mongolia basically stopped and turned into intraplate tectonic stage,and the intraplate characteristics were more obvious in Permian,at this time,volcanic activity had stopped,which was related to the formation of Central Asia.The mountain belt is related to the stage of amalgamation,which is the intraplate tectonic environment.So this paper can provide some meaningful references for the late Paleozoic tectonic evolution framework in southern Mongolia.
作者
席宏
李俊建
李华明
付超
党智财
唐文龙
XI Hong;LI Junjian;LI Huaming;FU Chao;DANG Zhicai;TANG Wenlong(CNNC Geologic Party No.208,Baotou,Inner Mongolia 014010,China;Tianjin Center,China Geological Survey(North China Center for Geoscience Innovation),Tianjin 300170,China)
出处
《华北地质》
2023年第4期10-21,共12页
North China Geology
基金
国家重点研发计划政府间国际科技创新合作重点专项“蒙古晚古生代岩浆活动与铜(金钼银)成矿作用”(2022YFE0119900)
中国地质调查局项目“中蒙边界重要成矿带1∶100万成矿规律图编制与研究”(1212010561510)
“中蒙边界地区重要成矿带成矿规律对比研究”(1212011120330)
“华北地区区域成矿规律研究与总结”(DD20221695-30)
科技部国际科技合作项目“蒙古东方省铅锌多金属资源潜力评价”(2012DFB20220)。
关键词
岩浆岩
地球化学
晚古生代
南蒙古地区
Magmatic rocks
geochemistry
Late Paleozoic
southern Mongolia
作者简介
席宏(1991-),男,工程师,硕士,主要从事铀矿地质学研究工作,E-mail:easilyxi@163.com;通信作者:李俊建(1962-),男,研究员,博士生导师,主要从事区域成矿学研究及矿产勘查工作,E-mail:tjlijunjian@163.com。
