摘要
砂金成矿地质条件:砂金物质来源于含金丰度较高的建平群以及具金矿化的构造破碎带和火山岩型金矿床(点);有利的新构造运动,地壳缓慢差异上升,剥蚀作用大于堆积作用,使含金地质体长期处于地表氧化带遭受充分地风化破碎作用,使金容易从含金地质体中解离出来;本区为干燥、多风、少雨气候条件,不易形成冲积型大型砂金矿。建平群出露区、凌源—北票—阜新断裂带两侧、含金多金属硫化物矿床(点)的氧化带、原生金矿床(点)分布区以及山前、山间、洪积扇、支谷的中上游或源头是寻找残积、坡积、洪积和细各砂金矿的有利地区。
The ore-forming geological condition for placer gold deposit as follows: materials came from Jianping Group with high content of gold, tectonofracture zone of mineralization and volcanic type of gold deposit (spot); favourable neotectonism, crust differential slowly uplifting and intensively denudation caused auriferous geological body exposing in surface oxidized zone for a long time and underwenting detrition. In the last, the gold could easily removel from auriferous geological body. The climate condition in the area was dry, more wind and less rain. It is hardly to form a large scale of alluvial type of placer gold deposit. The outcropping area of Jianping Group, the both sides of Lingyuan-Beipiao-Fuxin fault zone, the oxidized zone of auriferous polymetallic sulfide ore deposit (spot), the distribution area of original ore deposit (spot) and foreland, intermontane, pluvial fan, the middle-Up reaches or waterhead of the branch valley are the favourable areas for searching residue type, talus type and ravine type of placer gold deposits.
关键词
砂金矿
成矿条件
找矿方向
金矿床
placer gold deposit ore-forming condition prospecting direction
