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HQ E爆破地震测线的地壳浅部的精细结构研究结果表明 ,上地壳的速度结构由疏松盖层、沉积层、加里东褶皱构造层及元古宙结晶基底等 4个构造层构成 ,且大致以武夷山为界 ,宁都以西的低速凹陷区与中新生代沉积盆地相对应 ,加里东褶皱基底底部剧烈起伏 ,其最大埋深可达 10km ;而在宁都以东地区 ,地表速度明显增大 ,且加里东褶皱基底底界的深度明显变浅 ,仅为 3～ 5km。笔者根据地壳浅部速度精细结构的变化特征对剖面沿线的构造单元进行了划分 ,并对邵阳盆地、衡阳盆地、茶陵盆地及泰 (和 )兴 (国 )盆地等盆地的分布范围、性质、基底及其主要地层分布进行了初步的分析和探讨
The results show that the velocity structure of the upper crust consists of four structural layers: unconsolidated caprock, sedimentary layer, Caledonian fold structural layer and Proterozoic crystalline basement, and generally In the Wuyishan area, the low-speed depression area to the west of Ningdu corresponds to the Mesozoic-Cenozoic sedimentary basin. The bottom of the Caledonian fold base fluctuates drastically with a maximum buried depth of up to 10km. In the east of Ningdu, the surface velocity increases obviously The depth of the bottom of the Caledonian fold base is significantly lighter, only 3 ~ 5km. According to the variation characteristics of the fine structure of the crustal shallow velocity, the authors divide the tectonic units along the profile, and analyze the distribution range, nature, distribution and structure of the basins in Shaoyang basin, Hengyang basin, Chaling basin and Taixing (basin) The basement and its main strata distribution were analyzed and discussed