冀东-辽西主要金矿矿集区地质特征的差异性与成矿作用的统一性探析

Geological Differences and Mineralization Unity of the Key Gold Ore Concentrated Regions in Eastern Hebei and Western Liaoning Provinces

通过对燕辽成矿带东段冀东-辽西金矿床基础地质地球化学资料分析,结合区域构造演化和成矿时间及其分布空间的特异性,认为冀东-辽西金矿成矿物质具有相同的深来源特征,由于具体的构造背景不同而表现出矿床类型和就位空间的差异性,提出了燕辽裂陷槽是冀东-辽西金矿床空间分布的诱因,并提出冀东-辽西金成矿演化分为陆陆碰撞拼贴期（4.5~1.85Ga）、陆内裂陷巨厚沉积期（1.85~0.6Ga）、板内造山挤压隆升期（200~145Ma）、构造体制转换成矿期（145~100Ma）和成矿后的改造期（100Ma~至今）等5个统一阶段的结论性认识。

Based on the basic geological setting and geochemical data of gold deposits in the eastern section of the Yanliao metallgenic belt,in combination with regional tectonic evolution,and metallogenic time and mineral sptial distribution,the study indicates that ore-forming materials of the gold deposits in two regions have the same deep origin.Due to the different deposit types and spatial distribution differences,both of which resulted from various tectonic backgrounds,our study suggests that the Yan-Liao rifting trough was a leading factor for spatial distribution of the gold deposits in eastern Hebei and western Liaoning Provinces.The conclusive recognition has been made on its metallogenic evolution,which includes five phases： ① continent-contient collisional collage period at 4.5～1.85Ga;② intracontinental rifting sedimentary period at 1.85～0.6Ga;③ lifting period of intraplate orogenic extrusion at 200～145Ma;④ the transformation period of tectonic regime at 145～100Ma,and ⑤ post-mineralization modification period ranging from 100 Ma up to now.