摘要
铜绿山夕卡岩型铜铁金矿床是目前中国最大的夕卡岩型铜多金属矿床之一。近年来,岩石原生晕地球化学勘查结合构造和碳酸盐围岩-岩体接触界面延伸方向进行深部隐伏矿体预测取得了成功,新发现的ⅩⅢ号矿体显著增加了矿床资源量。从平面上、剖面上分别对岩石原生晕地球化学和短波红外光谱(SWIR)勘查的找矿预测结果进行对比研究发现,(1)岩石原生晕地球化学勘查在平面上通过指示元素异常套合进行隐伏矿体预测的效果比较明显。指示元素异常的出现与元素的亲铜性、亲硫性、迁移性等特征有关,同时也受热液蚀变作用的影响;在剖面上,岩石原生晕地球化学分析显示大部分元素仅富集在矿体位置,与夕卡岩型矿床中成矿热液的流动严格受接触界面控制的规律相一致,除I之外的元素在剖面上对找矿预测的指示作用并不显著。(2)SWIR结果在平面和剖面上均显示绿泥石的Fe-OH从围岩→接触带/矿化中心呈明显的低值→高值变化规律,平面上能较为精确地进行矿体定位,在垂向距离矿化中心约400 m处进入有效预测范围,显示SWIR勘查在隐伏矿体找矿预测方面具有较好的发展潜力。
The Tonglüshan Cu-Fe-Au deposit is one of the largest skarn copper polymetallic deposits in China.In recent years,the prediction of deep,concealed orebodies has been successful in whole-rock geochemical exploration,and the newly discovered XIII orebody has made an important contribution to the mineral resources in Tonglvshan.A comparative study between a short-wave infrared spectroscopy(SWIR)survey and whole-rock primary-halo geochemical exploration for ore prospecting on planes and sections were conducted.The findings showed that:(1)the combination of indicator element halos were effective for predicting concealed orebodies.Indicator element anomalies were related to the characteristics of chalcophile and sulfophile affinity,and the migration of elements etc.,and were also affected by hydrothermal alteration.On the sectional profile,geochemical analysis of whole rock revealed that most of elements were enriched in the orebody only,as controlled by the ore-forming process of the skarn deposit.Element primary halos were not very effective for predictions(except for iodine).(2)The SWIR results showed that the Fe-OH position values(Pos2250)of chlorite exhibited an obvious trend that changed from low to high when moving from the wall rock to the contact zone/mineralization center in both plane and section profiles.The orebody position could be accurately limited in the plane view.Meanwhile,the Pos2250 values increased gradually when entering a distance of^400 m from the mineralization center,thus indicating that the SWIR method has great potential for mineral exploration.
作者
李莎莎
陈华勇
张世涛
孙四权
金尚刚
魏克涛
刘冬勤
程佳敏
许高
LI Sha-sha;CHEN Hua-yong;ZHANG Shi-tao;SUN Si-quan;JIN Shang-gang;WEI Ke-tao;LIU Dong-qin;CHENG Jia-min;XU Gao(CAS Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinses Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangdong Nonferrous Metal’s Geological Exploration Institution,Guangzhou 510080,China;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou 510640,Guangzhou,China;Geological Survey of Hubei Province,Wuhan 430034,Wuhan,China;First Geological Team of Hubei Geological Bureau,Daye 435100,China)
出处
《地球化学》
CAS
CSCD
北大核心
2020年第2期205-217,共13页
Geochimica
基金
湖北省地质局鄂东南地区夕卡岩型-斑岩型隐伏矿床勘查标识体系研究项目(KJ2018-5)
国土资源部公益性行业科研专项经费项目(201511035)。
关键词
地球化学勘查
短波红外光谱
原生晕
有效性对比
铜绿山铜铁金矿床
湖北省
geochemical exploration
short-wave infrared spectroscopy
primary halo
validity comparison
Tonglüshan Cu-Fe-Au deposit
Hubei Province
