秦岭加里东晚期—华力西早期复式前陆盆地  

Qinling polygenic foreland basin in Late Caledonian to Early Variscan

作　　者：曹宣铎[1] 胡云绪[1] 

机构地区：[1]西安地质矿产研究所,西安710054

出　　处：《西北地质科学》2000年第2期1-14,共14页Northwest Geoscience

基　　金：国家自然科学基金!( 4 9572 112 );国土资源部国际合作与科技司"九五"地学前缘项目!( 950 112 6)资助

摘　　要：南秦岭西段的志留纪—早泥盆世及中秦岭北缘的志留纪—早石炭世的沉积特征表明 ,两区均存在有早期理里石相和晚期磨拉石相 ,构成完整的前陆盆地充填序列 ,并由冲断造山带—前渊—前隆 3部分构成完整的前陆盆地体系。南秦岭前陆盆地是扬子北缘裂陷盆地闭合的产物 ,形成于 430 Ma,结束于 390 Ma,历时 40 Ma,属板内前陆盆地 ;中秦岭前陆盆地位于扬子北缘的边缘 ,是秦岭洋闭合后的产物 ,形成于 440 Ma,结束于 32 3Ma,历时 1 0 7Ma,属周缘前陆盆地 ;北秦岭二郎坪弧后前陆盆地的上限是 32 0 Ma,是在加里东晚期—华力西早期于陆—弧—陆碰撞的背景下形成 3种类型的前陆盆地 ,它们组成了秦岭复式前陆盆地 ,总历程达 1 2 0 Ma。In the west section of south Qinling mountain range in Silurian to early Devonian as well as the north edge of Central Qinling mountain range in Silurian to early Caboniferous ,sedimentary features show that in the two districts there exist flysch and molasse upward which form the complete filling sequence of foreland basin and the complete foreland basin system ,consisting of three discrete zones such as the foredeep,forebulge and back bulge South Qinling foreland basin is the outcome when split basin closed in the north margin of Yangtze landmass, formed from 430 Ma and finished at 390 Ma, lasted 40 Ma, being referred to as an intraplate foreland basin;Central Qinling foreland basin formed from 440 Ma to 323 Ma, lasted 107 Ma ,located in the edge of north margin of Yangtze landmass and is the outcome of the Qinling Ocean basin when closed ,referred to as a peripheral foreland basin; the upper time limit of the Erlangping retroarc basins in North Qinling is 320 Ma The three kinds of foreland basins of this type were formed under the background of landmass arc landmass collision in late Caledonian early Variscan, they formed the Qinling polygenic foreland basin system, the total course reaches 120 Ma

关 键 词：复式前陆盆地 大陆造山带 充填序列 沉积 演化 

分 类 号：P544.4[天文地球—构造地质学] P542.2[天文地球—地质学]