东北地区金矿自然重砂异常及其找矿指示意义

INDICATION OF GOLD HEAVY MINERALS ANOMALY OF NORTHEASTERN CHINA

统计了黑龙江、吉林、辽宁等省典型金矿床的自然重砂情况,得出斑岩型、矽卡型、造山型和热液型的金矿所对应的自然重砂矿物组合。其中金自然重砂分布广泛,主要受地形特征和水系分布制约,具有一定的区带性特征,可以划分为12个异常集中区;多分布于隐伏断裂附近,且与金矿床响应具极好的相关性;自然金、黄铁矿、辰砂和白钨矿等矿物对金矿响应程度较高。不同成因类型金矿床的重砂矿物组合存在差异,斑岩型金矿为自然金—黄铁矿—辰砂—白钨矿—方铅矿—黄铜矿—锆石—金红石,矽卡型金矿为自然金—黄铁矿—辰砂—石榴子石—磷灰石,造山型金矿为自然金—黄铁矿—辰砂—白钨矿—方铅矿—黄铜矿,热液型金矿为自然金—黄铁矿—辰砂—白钨矿—方铅矿。综合研究认为,重砂异常对矿产地存在指示作用,重砂矿物的标型组合可以体现出特定成因金矿床的指示标志。

This paper, based on a statistic analysis of gold heavy minerals in Heilongjiang, Jilin and Laoning＇s typical gold deposits, presents their typical heavy mineral combination in porphyry, skarn, orogenic and hydrothermal gold deposits. Gold heavy minerals are widely spreading, mainly confined by terrain and streams, showing center zoning. Study area can be divided into 12 anomaly zones, most near hidden faults with highly relativity with gold deposits from natural gold, pyrite, cinnabar and scheelite. Gold heavy mineral combination varies with gold deposit types. Porphyry gold shows an combination of natural gold-pyrite-cinnabar-scheelite-galena-chalcopyrite-zicon-rutile, skarn gold shows natural gold-pyrite-cinnabar-garnet-apatite, orogenic gold shows natural gold-pyrite-cinnabar-scheelite-galena- chalcopyrite, hydrothermal gold shows natural gold-pyrite-cinnabar-scheelite-galena. Heavy minerals anomaly is anindicator of ore deposit, their combination is related to certain gold deposits.