冀北张宣、遵化-青龙金矿带金矿床地质特征及矿床成因  

Geological Characters and Genesis of the Zhangxuan and Zunhua-Qinglong Gold Ore Belts in Northern Hebei

作　　者：周传芳[1,2] 王建国[2] 王献忠[2] 梁中恺 路英川[2,3] 公维国[1] 汤鹏飞[1] 王存柱[4] 

机构地区：[1]武警黄金第三支队,黑龙江哈尔滨150086 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]武警黄金地质研究所,河北廊坊065000 [4]武警黄金第一支队,黑龙江牡丹江157021

出　　处：《地质与勘探》2014年第6期1024-1037,共14页Geology and Exploration

摘　　要：张宣金矿带和遵化-青龙金矿带是冀北地区两个最主要的金矿带,以其金矿床数量多,储量大备受关注。本文整理了两个金矿带内主要金矿床的硫、铅、氢、氧同位素与成矿时代数据。结果显示,两个矿带硫同位素组成上差距较大,通过与大本图解上相应稳定矿物场进行对比总硫δ34S≈0‰,与主要赋矿围岩太古代老变质岩系的δ34S值接近,说明金矿床具有太古代变质岩系与幔源硫特点;铅同位素数据投影点大部分落于地幔、下地壳和造山带铅叠合区域,与硫同位素具有一致性,均来源于太古代老变质岩系和地球深部混合;氢氧同位素显示成矿流体主要来源于岩浆水和大气降水的混合;成矿时限较大,从燕山早期到晚期均有成矿作用发生,以早中期为主。两者在矿床成因机制上具有相似性,为印支末期-燕山期强烈的构造-岩浆活动导致地壳重熔,太古宙老变质岩系中金活化,并与岩浆活动带入的深源金混合,随岩浆热液一起运移,最终沉淀成矿。The Zunhua and Qinglong gold belts,located in the northern Hebei Province,are the most important gold belts containing abundant deposits and mineral resources. Though locating in the same geographical area,the two gold belts show different tectonic background,host rocks and ore-bearing structures. In this paper,the S,Pb,H,O isotopes and mineralization geochronology date of the two gold belts are systematically collected. The result shows that the S isotopic compositions of them are distinctly different,but the total δ34S of ores near to 0‰( CDT) in contrast with stable mineral field,which resemble the δ34S data of the host rock( mainly the Archean metamorphic rocks; Zhangxuan averaging 2. 46‰ and Zunhua-Qinglong averaging 1.33‰),suggesting a sulfur source derived from the Archean metamorphic rocks( mantle-affinity). Most Pb isotopic date are fall in the overlap area of mantle-,lower crust-,and orogenic belt-member,similar to those of the S isotopes,suggesting that they both form by mixing of the old metamorphic rocks and the depths source of the earth. The H- O isotopic data indicate that the ore-forming fluid mainly of mixture between magmatic water and atmospheric water. These types of deposits were formed in Early to Late Yanshanian,but mostly concentrate in Early Yanshanian. The genetic mechanism is analogous for the gold deposits from both belts. Both are formed by intense tectono-magmatic activities resulting in crust rocks remelted during Late Indosinian to Yanshanian,and mixing with deep-derived gold in magmatic belt. The gold were immigrated by magmatic hydrothermal fluid and finally precipitated in suitable space.

关 键 词：张宣金矿带 遵化-青龙金矿带 成矿物质来源 成矿时代 矿床成因 

分 类 号：P618.51[天文地球—矿床学]