摘要
拉嘎组发育于拉萨地块中部,细碎屑岩基底上发育的一套粗碎屑岩,岩性主要为砂岩、杂砂岩,偶见冰碛物。通过研究了冈底斯西段措勤盆地南缘拉嘎组岩石物源及构造环境、地球化学特征表明,罗仓地区晚石炭世拉嘎组的沉积构造背景处于由被动大陆边缘向主动大陆转化的初级阶段,其物质来源为上地壳。
The Laga Formation consists mainly of sandstone,greywacke and glacial till.It is developed in the central Lhasa massif.This paper deals with material sources,tectonic environment and geochemistry of the Laga Formation on the southern margin of the Coqên basin in the west Gangdisê.The study indicates that the Laga Formation in the Luocang area was deposited in the primary stage of transformation from passive continental margin to active continental margin and that its material was derived from the upper crust.
作者
饶世成
杨晨梦
RAO Shi-cheng;YANG Chen-meng(College of Earth Science,Chengdu University of Technology,Chengdu 610059;University of Chinese Academy of Sciences,Beijing 100049)
出处
《四川地质学报》
2018年第4期531-535,共5页
Acta Geologica Sichuan
基金
四川省2016年省级大学生创新创业训练计划项目"西藏罗仓地区拉嘎组沉积特征及构造意义"(201610616147)
资源勘查工程专业教育部卓越工程师教育培养计划项目(17Z0511)
"卓越计划"背景下资源勘查工程专业实践教学体系的建设与改革项目(16Z0509)
西藏1:5万罗仓地区4幅区域地质矿产调查(批准号:1212011221067)联合资助
关键词
拉嘎组
物源
构造环境
罗仓地区
Luocang area
Laga Formation
sandstone
material sources
tectonic environment
