地球化学
地毬化學
지구화학
GEOCHIMICA
2015年
1期
87-101
,共15页
郑硌%顾雪祥%章永梅%刘瑞萍%耿会青%王艳忠%赵红海%李亚军
鄭硌%顧雪祥%章永梅%劉瑞萍%耿會青%王豔忠%趙紅海%李亞軍
정락%고설상%장영매%류서평%경회청%왕염충%조홍해%리아군
围岩蚀变%元素迁移%定量计算%浅成低温热液金矿%黑龙江省
圍巖蝕變%元素遷移%定量計算%淺成低溫熱液金礦%黑龍江省
위암식변%원소천이%정량계산%천성저온열액금광%흑룡강성
wall rock alteration%element mobilization%mass-change quantification%epithermal gold deposit%Heilongjiang Province
高松山浅成低温热液金矿床赋存于下白垩统安山岩等中基性火山岩中。矿体受围岩中断裂破碎带的控制,呈脉状产出。矿区围岩蚀变主要发育硅化、黄铁矿化、冰长石化、伊利石化、绢云母化、碳酸盐化和绿泥石化等。根据蚀变矿物组合和蚀变岩地球化学特征,可将围岩蚀变由近矿至远矿分为3个带:强硅化-冰长石化带、硅化-伊利石化-冰长石化带、伊利石化-青磐岩化带。对各蚀变带进行了全岩元素地球化学分析,利用元素迁移定量计算和图解等方法详细估算和拟定了蚀变过程中元素的迁移规律及其与蚀变矿物学之间的联系。结果表明,安山岩蚀变过程与金矿化密切相关,特别是硅化、冰长石化和黄铁矿化蚀变阶段。根据围岩蚀变形成过程与成矿之间的联系,探讨了高松山金矿床围岩蚀变的形成机制。
高鬆山淺成低溫熱液金礦床賦存于下白堊統安山巖等中基性火山巖中。礦體受圍巖中斷裂破碎帶的控製,呈脈狀產齣。礦區圍巖蝕變主要髮育硅化、黃鐵礦化、冰長石化、伊利石化、絹雲母化、碳痠鹽化和綠泥石化等。根據蝕變礦物組閤和蝕變巖地毬化學特徵,可將圍巖蝕變由近礦至遠礦分為3箇帶:彊硅化-冰長石化帶、硅化-伊利石化-冰長石化帶、伊利石化-青磐巖化帶。對各蝕變帶進行瞭全巖元素地毬化學分析,利用元素遷移定量計算和圖解等方法詳細估算和擬定瞭蝕變過程中元素的遷移規律及其與蝕變礦物學之間的聯繫。結果錶明,安山巖蝕變過程與金礦化密切相關,特彆是硅化、冰長石化和黃鐵礦化蝕變階段。根據圍巖蝕變形成過程與成礦之間的聯繫,探討瞭高鬆山金礦床圍巖蝕變的形成機製。
고송산천성저온열액금광상부존우하백성통안산암등중기성화산암중。광체수위암중단렬파쇄대적공제,정맥상산출。광구위암식변주요발육규화、황철광화、빙장석화、이리석화、견운모화、탄산염화화록니석화등。근거식변광물조합화식변암지구화학특정,가장위암식변유근광지원광분위3개대:강규화-빙장석화대、규화-이리석화-빙장석화대、이리석화-청반암화대。대각식변대진행료전암원소지구화학분석,이용원소천이정량계산화도해등방법상세고산화의정료식변과정중원소적천이규률급기여식변광물학지간적련계。결과표명,안산암식변과정여금광화밀절상관,특별시규화、빙장석화화황철광화식변계단。근거위암식변형성과정여성광지간적련계,탐토료고송산금광상위암식변적형성궤제。
The Gaosongshan epithermal gold deposit is hosted in a Lower Cretaceous andesite. Ore bodies occur as veins controlled by fractured zones in wall rocks. Hydrothermal alteration are well developed in the Gaosongshan gold deposit, including silicification, pyritization, adularization, illitization, sericitization, carbonatization, chloritization, etc. According to alteration mineral assemblage and whole rock geochemistry, 3 alteration zones have been identified (proximal to distal):strong silicification-adularization zone, silicification-illitization-adulari-zation zone and adularization-propylitization zone. This paper focuses on estimating the migration pattern of elements by quantitative calculation and graphical methods, and discussing the link between alteration mineralogy and elements migration. Results show that alteration process of andesite is closely related to Au mineralization, especially silicification, adulariazation and pyritization. Based on the relationship between alteration process and mineralization, we discussed the hydrothermal alteration forming mechanism of the Gaosongshan gold deposit.