陕西唐王陵组沉积物重力流特征和形成机理

CHARACTERISTICS AND FORMATIONAL MECHANISM OF THE SEDIMENT GRAVITY FLOW OF THE TANGWANG LING FORMATION OF SHAANXI

陈万川 郝蜀民 黄家斌

Chen Wanchuan Hao Shumin Huang Jiabin

地质矿产部第三石油普查勘探大队

The 3rd Brigade for Petroleum Prospecting and Exploration, Ministry of Geology and Minerals

这套地层在陕西礼泉唐王陵地区出露最好,总厚度1644.10米.可分为五个岩性段.1.下砾岩段:浅灰、浅红色块状砾岩,含砾泥岩.厚543.69米.分一、二两个亚段.2.页岩段:灰绿色页岩、粉砂质页岩夹砂岩透镜体,有时夹云质燧石角砾岩.揉皱、滑动构造发育.皇坪沟剖面厚75.15米.3.硅化白云岩段:浅灰、灰白色燧石白云岩、纹层状砂屑云岩、紫灰色云质页岩组成旋回沉积.皇坪沟剖面云岩段厚126.26米.普遍含有迭层石.

The sediment gravity flow of the Tangwang Ling Formation can be divided into four types according to both their lithology and sedimentary characteristics, i.e., debris, clastic, grain and turbidity. This paper makes a statement on their characteristics, formational mechanism and development. The author suggests that the formation, development and distribution of the gravity flow of the Tangwang Ling Formation were under the effect of the second episode of the Caledonian and the control of differentiational uplift and subsidence faulting. Paleo-geographically it is referred as a residual ocean basin of foremountain faultdown type trending NEE. Sediments settled down by the gravity flow in this area are of the type of multiple-source faultdown-basin; the sediments were principally resulted from gravity flow in shallow water, rather than the so-called "glacial sediments".

https://doi.org/10.11781/sysydz198403203