塔里木盆地腹地玛扎塔格地区新近纪砂岩组分和重矿物组合特征及物源分析

ANALYSIS OF DETRITAL COMPOSITION,HEAVY MINERAL COMBINATION CHARATERISTICS AND SAND PROVENANCE OF NEOGENE SANDSTONES,MAZHATAGE MOUNTAIN IN THE CENTRE OF TARIM BASIN

发育于塔里木盆地腹地——玛扎塔格地区的新近纪沉积地层出露良好,保存了其物源区造山带的隆升剥蚀信息。利用古水流、砂岩碎屑组构和重矿物组合特征等研究方法,结合研究区的区域构造演化,探讨玛扎塔格地区晚新生代以来古地貌格局及沉积物源区隆升剥蚀的沉积响应关系。结果表明该研究区的古地貌总体格局为西高东低,沉积物源在上新世早期之前主要来自于西昆仑造山带和帕米尔造山带,而到了上新世以来其沉积物源主要来自于帕米尔造山带,并且在上新世早期,物源区发生明显的构造隆升运动,更新世期间物源区出现快速隆升剥蚀构造事件。

Developed in the hinterland of the tarim basin , Neogene sedimentary stratain the centre of Tarim basin are well-outcropped and hold the information about the uplift and denudation of provenance orogenic belt. Using the methods of paleocurrent, sandstone detrital component and heavy mineral assemblages characteristics , combing with regional tectonic evolution of the study area, the sedimentary response relationship between the paleogeomorphology pattern and the uplifting and denudation of the sediment source area is discussed in Mazhatage Mountain. Results show that the overall pattern of the ancient landform in the study area is high in the west and low in the east, the sediment source of the study area before the early Pliocene mainly comes from the West Kunlun orogenic belt and Pamirsorogenic belt,while since the beginning of Pliocene epoch the sediment source mainly comes from Pamirs orogenic belt, and in the early Pliocenethere was an obvious structural uplift movement in the source area, and a rapid rise and denudation tectonic event occurred during the pleistocene period.