论文部分内容阅读
应用Q型聚类、相关分析和ZTR指数等数理统计方法,对柴达木盆地北缘古近系碎屑岩中的重矿物进行稳定矿物和非稳定矿物及其组合特征进行了分析,并判断其物源方向。古近系的重矿物主要表现为稳定矿物含量大于非稳定矿物的含量,表明该区沉积物搬运距离较长,离物源区相对较远。柴达木盆地北缘古近系各层组的重矿物类型及其组合形式、ZTR指数分布特征等均很接近,表明物源在沉积演化过程中具有明显的继承性。综合分析得出物源方向有3个:北西部阿尔金山物源区、小赛什腾山—赛什腾山物源区和东部的祁连山—绿梁山物源区。三大物源区内可进一步分为若干小的物源区,各物源相对独立,仅在冷湖四号、五号构造带受阿尔金山物源区及小赛什腾山物源区的综合影响。
Using Q-type clustering, correlation analysis and ZTR index and other mathematical statistics methods, the stable mineral and non-stable minerals and their combination characteristics of heavy minerals in the Paleogene clastic rocks in the northern margin of the Qaidam Basin were analyzed and judged Its source direction. The heavy minerals in Paleogene mainly show the content of stable minerals is larger than that of non-stable minerals, indicating that sediments in this area are transported a long distance away from the source area. The types of heavy minerals and their assemblages, the distribution of ZTR indices and other characteristics of the Paleogene strata in the northern margin of the Qaidam basin are close, indicating that the provenance has obvious inheritance during sedimentary evolution. According to the comprehensive analysis, there are three provenance directions: the source region of the Altun Mountains in the northwestern part, the source zone of the Jistengshan-Seishengshan in the northwestern part, and the Qilian-Loulian source zone in the east. The three major source areas can be further divided into a number of small source areas, each source is relatively independent, only in the cold lake on the 4th, No. 5 tectonic belt by the Altyn Mountain source area and the small Saishiteng source area synthesis influences.