与东秦岭超大型钼矿床有关的钾长石-石英条纹岩研究  

STUDY ON THE ULTRA LARGE SCALE MOLYBDENUM DEPOSITS RELATED TO POTASH FELDSPAR QUARTZ CRENULATE IN THE EASTERN QINLING

作　　者：徐兆文[1] 陆现彩[1] 杨荣勇[1] 孙晓明[1] 任启江[1] 

机构地区：[1]南京大学地球科学系,南京210093

出　　处：《矿物岩石》1999年第3期11-15,共5页Mineralogy and Petrology

基　　金：国家自然科学基金

摘　　要：东秦岭超大型钼矿带是世界上重要的钼矿带之一，带内分布着几个大型至超大型钼矿床。与这些大型－ 超大型钼矿床有关的岩体顶部都发育了钾长石石英条纹岩。钾长石石英条纹岩中钾长石富Ｓｉ，Ｋ，贫Ｎａ；其三斜度、有序度低。石英包裹体中Ｆ－ ，Ｋ＋高，ＣＯ／ＣＯ２ 低，缺少ＣＨ４，形成温度为４００℃～５００℃。氢氧同位素分析表明：δ１８ Ｏ＝ ９．０６×１０－ ３ ～１０．０３×１０－ ３ ，δＤ＝ － ５７．２２×１０－ ３ ～－ ７５．１０×１０－ ３ ，证明钾长石石英条纹岩的物质来自晚期岩浆热液。The eastern Qinling is one of the most important molybdenum metallogenetic belts in the world. Several ultra large scale molybdenum deposits occur in the belt. Potash feldspar quartz crenulate often appears on the top of rock masses which are related to the molybdenum deposits. The potash feldspar is rich in Si and K and poor in Na. Texture analysis shows that potash fedspar is of low triclinicity and ordering index. The inclusiond of quartz are rich in F - and K + and poor in CH 4, with relatively low CO/CO 2 ratio. Homogeneous temperature revealed by quartz inclusions ranges from 400℃～500℃. Ther analysis of isotopic compositions of H and O shows that δ 18O ranges from 9.06×10 -3 to 10.03×10 -3 and δD from -57.22×10 -3 to 75.10×10 -3 , indicating that the rock forming materials are originated from late stage magmatic solution.

关 键 词：超大型 钼矿床 钾长石 石英 条纹岩 东秦岭 

分 类 号：P618.650.4[天文地球—矿床学] P588[天文地球—地质学]