银根—额济纳旗盆地苏红图坳陷早白垩世火山岩对阿尔金断裂研究的科学意义  

The Early Cretaceous volcanic rocks in Suhongtu Depression in Yingen-Ejina Qi Basin:Its scientific significance to the research of Altun Fault

作　　者：钟福平[1] 钟建华[2,3] 王毅[4] 由伟丰 杨伟利[4] 郑孟林[4] 

机构地区：[1]河南理工大学瓦斯地质研究所,河南焦作454000 [2]中国科学院广州地球化学研究所,广东广州510640 [3]中国石油大学(华东)地球资源与信息学院,山东东营257061 [4]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《地学前缘》2011年第3期233-240,共8页Earth Science Frontiers

基　　金："十一五"国家科技重大专项"大型油气田及煤层气开发"(2008ZX05040);中国石油化工股份有限公司重点项目"中国西北地区构造-岩相古地理研究与编图"(07370502000130)

摘　　要：通过对银根—额济纳旗盆地苏红图坳陷火山岩进行39Ar-40Ar同位素测年得到该套火山岩年龄值为(105.55±4.03)^(112.71±2.06)Ma,为早白垩世喷发物。对苏红图火山岩与位于阿尔金断裂周缘的酒西盆地红柳峡火山岩的年龄及地化特征进行了对比研究,认为红柳峡火山岩及苏红图火山岩均为阿尔金—恩格尔乌苏断裂断裂在早白垩世(106~113 Ma)重新活动的产物,但它们来自于不同幔源区。更为重要的是,这可能说明了从阿尔金断裂开始活动到红柳峡火山岩及苏红图火山岩喷发的这些时间里,阿尔金断裂北东方向的范围至少延伸到了苏红图地区。In the study,the 39Ar-40Ar dating of volcanic rocks of Suhongtu Depression in Yingen-Ejina Qi Basin yielded an age of（105.55±4.03）-（112.71±2.06） Ma,indicating the rocks being the Early Cretaceous eruption products.The volcanic rocks in Suhongtu Depression and in Hongliuxia of Jiuxi Basin are the eruption products of the same period caused by the reactivation of the Altun-Engeerwusu Fault in the Early Cretaceous（106-113 Ma） according to the geochronology,but they might come from different mantle source regions according to their geochemical characteristics.More important,the study suggested that from the beginning of the activation of the Altun Fault to the volcanic eruptions in Suhongtu and Hongliuxia,the Altun Fault had at least extended northeastward to the Suhongtu area.

关 键 词：银根—额济纳旗盆地 苏红图坳陷 早白垩世 阿尔金断裂 酒西盆地红柳峡 

分 类 号：P588.14[天文地球—岩石学]