晚新生代以来塔里木盆地周缘碎屑沉积物与周缘山系隆起时代对比

THE TIME COMPARISON BETWEEN THE DETRITAL SEDIMENT AND THE UPHEAVAL OF MOUNTAINS AROUND TARIM BASIN

作者用磁性地层学方法研究了塔里木盆地周缘吉迪克组、康村组、库车组、西域组及上覆黄土．结果表明：以细颗粒碎属为特征的吉迪克组、康村组为中新世沉积，年龄约２４．４０—５．３０ＭａＢ．Ｐ，以砾岩为特征的库车组、下西域组为上新世沉积，年龄约５．３０—２．５０ＭａＢ．Ｐ．。而上西域砾岩为早更新世早期沉积物，年龄约２．５０—１．５０ＭａＢ．Ｐ。作者认为，由于印度板块向欧亚板块的俯冲造成塔里木盆地周缘山系的迅速抬升形成高大山系的时代为上新世初期，大约５．３０ＭａＢ．Ｐ。

The strata, including Jidike Formation, Kangcun Formation, Kangcun Formation, Kuche Formation and Xiyu Formation as well as the overlying loess on the edge of Tarim basin, have been studied by magnetostratigraphy. The results show that Jidike Formation and Kangcun Formation, with fine-grained feature, were the sediments of Miocene epoch (24. 40 - 5. 30 Ma B. P). Kuche Formation and lower Xiyu Formation, which are characterized by gravel sediment, were developed during Pliocene epoch (about 5. 30-2. 50 Ma B. P). And the upper Xiyu Formation was developed during early Pleistocene (about 2. 50-1. 50 Ma B. P) In terms of the data above, it is deduced that the epoch, during which the speedily lifting of Qinghai-Tibet and gigantic mountains on the edge of Tarim basin occurred, was at the early stage of early Pliocene, abut 5. 30 Ma.