豫西小秦岭金矿区的一组^(40)Ar/^(39)Ar定年数据  

^(40)Ar/^(39)Ar Dating of the Xiaoqinling Gold Area in Henan Province

作　　者：徐启东[1] 钟增球[1] 周汉文[1] 杨发城 唐学超 

机构地区：[1]中国地质大学,武汉430074 [2]武警黄金九支队,河南三门峡市472000

出　　处：《地质论评》1998年第3期323-327,共5页Geological Review

摘　　要：本文提供了一组小秦岭金矿区的^(40)Ar/^(39)Ar定年数据。根据地质体的形成温度和被测定矿物封闭温度之间的关系,讨论了各个年龄的地质含义。认为东闯钾长花岗岩墙和文峪二长花岗岩体分别形成于印支期和燕山早期,主要金矿化发生在文峪二长花岗岩体已固结之后(132Ma)。自1.3Ga以来,本区遭受过的区域性热事件温度不会超过350℃。40Ar/39Ar dating has been conducted in the Xiaoqinling gold area. According to the relationship between the formation temperatures of geological bodies and the sealing temperature of Ar in minerals, the geological implications of various ages are discussed. The Dongchuang moyite dike and Wenyu monzogranite separately formed in the Indosinian and early Yanshanian. Major gold mineralization occurred after the Wenyu monzogranite was solidified (132 Ma age). No regional heat events with temperatures above the Ar sealing temperature of biotite (about 350℃) have affected the terrain since 1300 Ma B. P..

关 键 词：金矿床 矿化 氩40 氩39 定年数据 

分 类 号：P618.510.5[天文地球—矿床学] P618.510.2[天文地球—地质学]