新疆东部地区大地构造问题探讨

根据最新的航磁资料,主要探讨了新疆东部基底性质及岩相分区,指出在天山地区除普通存在古生界浅变质基底外,于吐鲁番—哈密盆地中南部深层还存在强磁性基底.库鲁克塔格地区由于元古界多为弱磁性或无磁性岩石,因而显示负磁场面貌,该区与南天山、塔里木盆地北部为区域负背景异常,推测它们为同一深部因素控制的构造区.磁场资料可清楚地圈定出塔里木地台东部边界.文中还对原中天山隆起带出现的升高变化异常提出了解释依据.

A PRELIMINARY STUDY ON GEOTECTONICS OF EASTERN XINJIANG

The latest aeromagnetic data have been obtained for establishing the nature of the basemant and petrographical demarcation in eastern Xinjiang. There exists intensely magnetized basement in the deep horizon of the centro-southern part of Turpan-Hami Basin apart from the widespread Palaeozoic epimetamorphic basement in Tianshan Mountains. The Proterozoic rocks in Kuluktag are poorly magnetic or non-magnetic therefore the magnetic field appears negative. This area has the same regional negative background of anormalies as the southern Tianshan and the northern Tarim Basin have. They are supposed to be the structural regions controlled by one and the same deep-rooted factor. Within the Tarim Platform, the eastera border has been clearly made put With the help ,of the magnetic data. The query is made in this paper on the validity of the so-called Central Tianshan Swelling; and the basis is provided for explanation of the rising anormalies in the "swelling" zone.