地质通报2016，Vol.35Issue(9)：1456-1462,7.
西藏狮泉河-革吉一带早白垩世地层沉积环境、岩石地球化学特征及其地质意义
Petrogeochemistry and sedimentary environment of the Early Cretaceous strata from the Shiquanhe-Gegyai area in Tibet and their geological significance
摘要
Abstract
Through comprehensive analysis of Early Cretaceous volcanic petrogeochemistry, sedimentary sequence, sedimentary char⁃acteristics and environment in the Shiquanhe-Gegyai area, the calc-alkaline volcanic rocks of the Wumulongqianbo Formation may represent plate subduction. The Duoai Formation, Tuocheng Formation and Langjiu Formation make up three partial melting series, indicating presence of arc crust thickening process under the condition of steepened subduction angle. The alkaline volcanic rock of the Langjiu Formation indicates subduction-induced arc crack. The sediments of the Jiega Formation and the Langshan Formation show the same residual basin under the transgression condition after closure of the Shiquanhe ophiolite mélange. The depth of the re⁃sidual basin is deep in the south and shallow in the north, and deep in the east and shallow in the west. At the same time, angular un⁃conformity occurred at the edge of the basin, which gradually evolved into weak angular unconformity-conformity towards the inte⁃rior of the basin.关键词
狮泉河/蛇绿混杂岩/岩石地球化学/沉积环境/构造Key words
Shiquanhe/ophilitic mélange/petrogeochemistry/sedimentary environment/tectonics分类
天文与地球科学引用本文复制引用
杨永锋,姜亚国,王天赐,杨春辉,李芳林,唐静..西藏狮泉河-革吉一带早白垩世地层沉积环境、岩石地球化学特征及其地质意义[J].地质通报,2016,35(9):1456-1462,7.基金项目
中国地质调查局项目 （）
