摘要
1∶25万玛依岗日幅区域地质调查期间,在藏北戈木错北部发现了一套新生代钾质火山岩。对保存较好的3处火山岩的样品进行40Ar/39Ar年代学研究,获得了30.6Ma±0.4Ma、30.0Ma±0.2Ma和29.8Ma±0.3Ma三个坪年龄,代表该地区火山岩的喷溢时代。戈木错北部火山岩的地球化学特征与钾质火山岩的类似,它与鱼鳞山、走构由茶错、多格错仁等地区的新生代火山岩共同构成了羌塘地区钾质—超钾质火山岩带,它们的形成与印度大陆同亚洲大陆的碰撞和青藏高原的隆升密不可分。
Cenozoic volcanic rocks are discovered in northern Gemucuo area during 1∶250000 Mayigangri regional geological investigation. 40Ar/39Ar dating are carried on three samples from this volcanic rocks amd yield the plateau ages of 30.6±0.4 Ma, 30.0±0.2 Ma and 29.8 ±0.3 Ma, which represent the volcanic eruption age. The geochemical characters of the volcanic rocks in the northern Gemucuo are similar with potassic volcanic rocks, together with the Cenozoic volcanic rocks distributing at Yulinshan, Zougouy-ouchacuo, duogecuoren etc. constitute, the Cenozoic potassic-ultrapotassic volcanic belt in Qiangtang area. The formation of these volcanic rocks has relations with the collision between India and Asia and uplift of Qinghai-Tibet plateau.
出处
《地质通报》
CAS
CSCD
北大核心
2009年第9期1221-1228,共8页
Geological Bulletin of China
基金
国家自然科学基金项目(编号:40872146
40672147)
中国地质科学院地质研究所基本科研业务费项目(编号:J0910)
中国地质调查局项目<1:25万玛依岗日幅区域地质调查>(编号:1212010818015
1212010561605)
中国石化项目(编号:PH08005)资助
