CẤU TRÚC ĐỊA CHẤT SÂU KHU VỰC HÀ NỘI VÀ LÂN CẬN TRÊN CƠ SỞ PHÂN TÍCH TÀI LIỆU TRỌNG LỰC

Abstract

The deep structure of Hanoi region and adjacent areas on the basic of gravity data analysis

In this article the authors have formulated a complex method for analysing and interpreting the gravity data in Hanoi
region and adjacent areas. The results obtained show:
1. The North-West directional faults: Song Lo, Song Chay, Vinh Ninh, Lao Cai - Ninh Binh and Song Hong (Red River) are playing important roles in separation of the geo-structural zone in Hanoi region.
2. The structure of the basement varies very complicated from outcrop on the surface to 7 - 8km in Song Hong structural zone. The Conrad discontinuity is most sophisticated, laying at the depth of 8 - 19km and formed the linear positive and negative structures having Northwest-Southeast direction. The depth to lower boundary of the Crust (Moho
surface) varies from 22km to 32km. The main structures of this surface are stretched along the of Northwest-Southeast direction.