安徽戴家河金矿含金建造特征及金的赋存状态研究
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摘要
磨子潭—晓天火山岩盆地是安徽省重要的岩金矿产区,戴家河金矿位于该成矿带内,以蚀变岩型和石英细脉带型为主。通过地质调查、钻探施工等技术手段,大致查清区内金矿体和含金建造地质特征。对采集的11件样品,运用镜下鉴定、电子探针微区测试(X射线荧光光谱分析)技术、X射线背散射图像观察显微—粗粒金的形态、大小及其内部结构、构造特征,进行分析。通过研究,得出该区金矿体的形态、规模、产状主要受含金石英细脉带和含金破碎蚀变岩带控制,破碎蚀变岩型矿石品位一般为3×10~(-6)~7×10~(-6),高于石英细脉带型金矿(2×10~(-6)~3×10~(-6));金主要以银金矿产出,金的成色变化于640~774之间,金的赋存方式有晶隙金、裂隙金和包体金3种类型,呈显微细粒状分布于石英中。
The Mozitan-Xiaotian volcanic basin is an important gold-producing area in Anhui where Daijiahe gold deposit occurs,there are two types of gold deposits in this belt,i.e.,altered rock type and quartz fine veinlet type. The geological characteristics of gold-bearing formation and gold orebodies were studied by the geological survey and drilling work.Total 11 samples were collected for studying gold occurrence of gold grain,morphology and internal texture by using microscopic identification,electron probe( X-ray fluorescence spectral analysis techniques),X-ray backscatter imagery. The microscope study result indicated that the shape,scale and occurrence of gold orebody was mainly controlled by gold-bearing quartz veinlet and fracture altered zone. The fracture altered rock type ore grade general ranges from 3×10~(-6)to 7×10~(-6),higher than that of quartz veinlet type gold orebody which is generally 2×10~(-6)~ 3 ×10~(-6). The main gold-bearing mineral is mainly elctrum,the purity of gold ranges from 640 to 774. The main occurrences of gold are crystal,fissure gold and inclusion gold. The gold grain mainly occurs in form of micro fine grained in quartz vein.
The Mozitan-Xiaotian volcanic basin is an important gold-producing area in Anhui where Daijiahe gold deposit occurs,there are two types of gold deposits in this belt,i.e.,altered rock type and quartz fine veinlet type. The geological characteristics of gold-bearing formation and gold orebodies were studied by the geological survey and drilling work.Total 11 samples were collected for studying gold occurrence of gold grain,morphology and internal texture by using microscopic identification,electron probe( X-ray fluorescence spectral analysis techniques),X-ray backscatter imagery. The microscope study result indicated that the shape,scale and occurrence of gold orebody was mainly controlled by gold-bearing quartz veinlet and fracture altered zone. The fracture altered rock type ore grade general ranges from 3×10~(-6)to 7×10~(-6),higher than that of quartz veinlet type gold orebody which is generally 2×10~(-6)~ 3 ×10~(-6). The main gold-bearing mineral is mainly elctrum,the purity of gold ranges from 640 to 774. The main occurrences of gold are crystal,fissure gold and inclusion gold. The gold grain mainly occurs in form of micro fine grained in quartz vein.
引文
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[15]陈井胜,彭艳东,刘淼,邢德和,李崴崴.辽西建平烧锅营子金矿花岗岩的锆石U-Pb年代学、地球化学特征及地质意义[J].中国地质,2016,(2):395-409.
[16]李强,杨富全,柴凤梅,杨俊杰.新疆准噶尔北缘阿克希克铁金矿流体包裹体研究[J].中国地质,2014,(6):1897-1913.
[17]张朋,杨宏智,孙景贵,赵岩,崔培龙.黑龙江省马连金矿床流体包裹体特征及其地质意义[J].中国地质,2015,(1):265-274.
[2]许长海.大别造山带碰撞后构造热/岩浆演化过程[D].同济:同济大学,2002.
[3]程万强.桐柏—大别造山带南缘边界断裂中生代变形特征及其对碰撞造山过程的启示[D].武汉:中国地质大学,2012.
[4]王西荣,潘家永,李绍侠.汪家冲—郎岭湾地区火山岩型金矿地质特征及成矿模式[J].金属矿山,2016,(5):118-124.
[5]王西荣.安徽省北淮阳晓天火山沉积洼地含金建造地质特征及找矿特征[J].江西建材,2012,(2):230-231.
[6]高大旗.安徽磨子潭—晓天地区中生代火山岩的时空分布及火山喷发旋回[J].安徽地质,1992,2(3):20-27.
[7]王明耀.安徽霍山隆兴金矿地质特征及找矿意义[J].上海地质,1987,(4):60-70.
[8]张定源,王爱国,张晓东,等.安徽省霍山县东溪—南关岭金矿地质特征与成矿条件[J].资源环境与调查,2014,(9):203-210.
[9]王果胜,马文璞.北淮阳带新元古代花岗质岩石的特征及大地构造意义[C]//香港地质学会、香港大学地球科学系.第三届海峡两岸三地及世界华人地质科学研讨会补充论文摘要集,香港地质学会、香港大学地球科学系,2001.
[10]潘法惠.大别山北麓磨子潭—晓天盆地火山岩副矿物的研究及其地质意义[J].安徽地质,1992,(2):35-43.
[11]刘华南,刘家军,代鸿章,陶银龙,王雷,王建锋,杜映东,范云飞.内蒙古新地沟金矿床中金的赋存状态研究[J].中国地质,2016,(1):261-274.
[12]谢智,陈江峰,张巽,周泰禧.北淮阳晓天盆地早白垩世玄武岩地球化学:富集地幔的证据[J].矿物岩石地球化学通报,2003,(1):26-31.
[13]韩春国.东溪金矿树脂矿浆法提金工艺试验研究与生产实践[J].黄金,2013,(4):53-55.
[14]焦彦杰,廖国忠,李华,张伟,李富,杨俊波.多不杂斑岩铜金矿区蚀变分带与黄铁矿的关系—物探方法选择与异常解释的基础[J].中国地质,2015,(6):1969-1979.
[15]陈井胜,彭艳东,刘淼,邢德和,李崴崴.辽西建平烧锅营子金矿花岗岩的锆石U-Pb年代学、地球化学特征及地质意义[J].中国地质,2016,(2):395-409.
[16]李强,杨富全,柴凤梅,杨俊杰.新疆准噶尔北缘阿克希克铁金矿流体包裹体研究[J].中国地质,2014,(6):1897-1913.
[17]张朋,杨宏智,孙景贵,赵岩,崔培龙.黑龙江省马连金矿床流体包裹体特征及其地质意义[J].中国地质,2015,(1):265-274.