首页 | 本学科首页   官方微博 | 高级检索  
     检索      

甘肃北山地区古亚洲南缘古生代岛弧带位置的讨论
引用本文:谢春林,杨建国,王立社,王育习,王静平.甘肃北山地区古亚洲南缘古生代岛弧带位置的讨论[J].地质学报,2009,83(11):1584-1600.
作者姓名:谢春林  杨建国  王立社  王育习  王静平
作者单位:1. 中国地质大学地球科学与资源学院,北京,100083;西安地质矿产研究所,西安,710054
2. 西安地质矿产研究所,西安,710054
基金项目:"十一五"国家科技支撑计划课题,国土资源大调查项目"甘肃营毛沱地区矿产远景调查"(矿调[2004]8-2号)资助的成果 
摘    要:综合研究得出结论:"甘肃北山红石山断裂带以北的雀儿山-英安山地区为一种与俯冲洋壳板块相关的岛弧带,它记录了古亚洲大洋向南缘东天山古陆系统下俯冲消减的整个地史过程".主要依据:①该地区缺少古老基底陆壳;②发育于区内的中奥陶世-泥盆纪不同时代地层中的火山岩和石炭-三叠纪的中酸性侵入岩,主要以钙碱性或TTG或埃达克成分系列为主要标志,揭示深部有消减洋壳板片或岩源的存在;③从中奥陶世和志留纪火山岩的玄武岩、安山岩和英安岩组合,到泥盆纪以安山岩、英安岩为主的流纹岩、玄武岩组合,至三叠纪马鞍山、小草湖中酸性侵入岩序列的部分高钾钙碱性岩石类型组合,反映古亚洲大洋在南侧消减带之上从一种不成熟岛弧到成熟岛弧和大陆边缘弧发育演化的过程;文章提出代表古亚洲大洋南缘消减带的实际位置应在雀儿山-英安山一线以北的蒙古境内,而北山岛弧带实属南侧东天山古陆陆缘增生地体的一部分.

关 键 词:甘肃北山  雀儿山-英安山地区  北山岛弧带  陆缘增生地体
收稿时间:2009/2/16 0:00:00
修稿时间:2009/9/21 0:00:00

Disscussion on the Location of Paleozoic Island Arc Zone on the South Margin of Paleo Asian Ocean in the Beishan Area of Gansu Province
XIE Chunlin,YANG Jianguo,WANG Lishe,WANG Yuxi,and WANG Jingping.Disscussion on the Location of Paleozoic Island Arc Zone on the South Margin of Paleo Asian Ocean in the Beishan Area of Gansu Province[J].Acta Geologica Sinica,2009,83(11):1584-1600.
Authors:XIE Chunlin  YANG Jianguo  WANG Lishe  WANG Yuxi  and WANG Jingping
Abstract:Based on the comprehesvie analysis of previsou research results, the study concludes that the Que'ershan-Yinganshan area, which is to the north of Hongshishan fault belt in Beishan Mt., Gansu province is an island arc associated with subduction ocean crust and records the geological process of the subduction of the ancient Asian Ocean crust subducted into the southern margin of East Tianshan old land. The conclusion is based on the facts as follows:① this area is lack of ancient continental crust basement; ② subducted ocean crust relicts are indicated by volcanic rocks contained various age strata ranging from mid-Ordovician to Devonian and Carboniferous-Triassic intermediate-acidic intrusions. These rocks are represented by some calc-alkaline rock association or TTG or adakite series; ③the evolution process of ancient Asian Ocean, which began with immature arc island, followed by mature island arc and ended by continental marginal arc, was successively testified by volcanic rock associations such as basalt, andesite and dacite in mid-Ordovician and Silurian, dominated by andesite and dacite interclating rhyolite in Devonian, and parts of high K calc-alkaline rock association of intermediate-acidic intrusions in Maanshan and Xiaocaohu in Triassic. Furthermore, it is suggested that the south subduction zone of ancient Asian Ocean should be really located in Mongolia, and the island arc zone should belong to part of continental margin accretionary terrain of East Tianshan old land.
Keywords:Gansu Beishan  Queershan-Yinganshan area  island arc zone  continental margin accretionary terrain
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《地质学报》浏览原始摘要信息
点击此处可从《地质学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号