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沙河沿山字型构造展布在东经128°00′—128°55′,北纬43°20′—43°35′,即敦化县沙河沿地区。分布达1500km~2,属中小型山字型构造(图1),它的前弧和反射弧延展在横道河子——永乐屯——东二龙山一带,宽达6—8km。本文概述山字型构造各组成部分的形迹特点及其与区内岩浆活动、矿化之间的成生联系,并探讨山字型构造的形成时代。一、山字型构造各组成部分形迹特点沙河沿山字型构造由前弧、东西两翼及其反射弧、脊柱、盾地构成。 (一)地貌特点多数情况下,不同形态的区域地貌,往往是不同构造体系的反映。沙河沿山字型构
Shahe along the mountain font structure spread in the longitude 128 ° 00’-128 ° 55 ’, latitude 43 ° 20’-43 ° 35’, Dunhua County Shahe along. Its distribution is 1500km ~ 2. It is a small and medium-sized mountain-shaped structure (Fig. 1). Its front arc and reflection arc extend in the area of Hengdaohezi-Yongle Tuen-East Erlongshan with a width of 6-8 km. This article summarizes the trace features of each component of the mountain font structure and its relationship with the magmatism and mineralization in the area, and explores the formation of the mountain font structure. First, the mountain shape structure of the various components of the shape and characteristics Shahe Yanshan font structure by the front arc, east and west wings and its reflection arc, spine, shield to form. (A) topography features In most cases, different forms of regional landscape, often reflects the different structural systems. Shahe along the mountain font structure