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黄金科学技术, 2019, 27(6): 791-801 doi: 10.11872/j.issn.1005-2518.2019.06.791

矿产勘查与资源评价

胶东金地球化学背景研究

陈玉民,1, 曾庆栋,2,3,4, 孙之夫5, 王昭坤1, 范宏瑞2,3,4, 肖风利1, 褚少雄2,3

1. 山东黄金集团有限公司,山东 济南 250101

2. 中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京 100029

3. 中国科学院地球科学研究院,北京 100029

4. 中国科学院大学地球科学学院,北京 100049

5. 山东黄金地质矿产勘查有限公司,山东 莱州 261400

Study on Geochemical Background Field of the Gold Deposits in Jiaodong,China

CHEN Yumin,1, ZENG Qingdong,2,3,4, SUN Zhifu5, WANG Zhaokun1, FAN Hongrui2,3,4, XIAO Fengli1, CHU Shaoxiong2,3

1. Shandong Gold Group Co. ,Ltd. ,Jinan 250101,Shandong,China

2. Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

3. Innovation Academy of Earth Science,Chinese Academy of Sciences,Beijing 100029,China

4. College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

5. Shandong Gold Geology and Mineral Exploration Co. ,Ltd. ,Laizhou 261400,Shandong,China

通讯作者: 曾庆栋(1964-),男,山东青州人,研究员,从事内生金属成矿作用与找矿预测研究工作。zengqingdong@mail.iggcas.ac.cn

收稿日期: 2019-08-22   修回日期: 2019-10-28   网络出版日期: 2019-12-20

基金资助: 国家重点研发计划项目“华北克拉通成矿系统的深部过程与成矿机理”.  2016YFC0600100
山东黄金集团有限公司科研(深钻)项目联合资助

Received: 2019-08-22   Revised: 2019-10-28   Online: 2019-12-20

作者简介 About authors

陈玉民(1961-),男,山东淄博人,高级工程师,从事金矿管理、采矿及找矿工作chenym@sd-gold.com , E-mail:chenym@sd-gold.com

摘要

胶东金矿集区形成于早白垩世构造体制转折期,具有大规模爆发成矿特征,是世界上重要的金矿集中区之一。针对胶东金矿集区成矿物质来源这一科学问题,采用Au元素地球化学分析法系统分析该区地表和深钻样品,揭示该区金的地球化学背景特征,为探讨该区Au元素高强度巨量堆积的成矿作用机制提供地球化学场制约。结果显示:地表胶东群变质岩具有中部高(金丰度均值为1.35×10-9)、东部及西部低(金丰度均值分别为0.95×10-9和0.76×10-9)的地球化学背景场特征;深钻岩石样品的金丰度均值均低于大陆地壳克拉克值及华北地台大陆地壳的金丰度平均值,同样显示亏损地球化学背景场特征。因此,在胶东金矿集区存在金的地球化学亏损场,结合矿区内围岩中普遍存在的热液活动迹象,认为胶东群和中生代花岗岩可能为胶东金矿的形成提供了部分成矿物质。

关键词: 地球化学背景场 ; 金丰度 ; 物质来源 ; 金矿集区 ; 深钻样品 ; 胶东

Abstract

Jiaodong gold ore-concentrating area is the third largest gold mining area in the world after the Lande gold mining area in South Africa and Muruntau gold mining area in Uzbekistan,and its proved gold resources exceed 4 500 t.Jiaodong gold ore-concentrating area formed in the Early Cretaceous tectonic regime transition period and has the characteristics of large-scale concentrated mineralization.This area is composed of a lot of super-large,large gold deposits and includes altered rock type,quartz vein type and interlayer fracture zone type gold deposit.The typical altered rock type gold deposits are Sanshandao,Jiaojia,Xincheng,Dayingezhuang,Xiadian and Dongfeng 171 deposits,and so on.The quartz vein type gold deposits include Linglong,Jinqingding and Denggezhuang deposits,and so on.The interlayer fracture zone type gold deposits are represented by the Pengjiakuang gold deposit.These gold deposits are mainly controlled by the regional faults,secondary faults and interlayer slide faults along the northern margin of the Laiyang basin.The gold deposits in Jiaodong mainly occur within the Mesozoic granite,minor whthin Jiaodong Group,Jingshan Group and Mesozoic strata.This paper selects the scientific problem of the source of ore-forming materials,and systematically analyzes the surface and deep-drilling samples sampled from the Jiaodong area by means of Au element geochemical analysis,in order to reveal the geochemical background characteristics of Au element in this area,and provides geochemical field constraints for discussing the metallogenic mechanism of high-intensity massive accumulation of Au element in this area.The results show that the average abundance of Au element (1.10×10-9) of the Jiaodong group is lower than that of Clark value of continental crust (1.21×10-9) and the value of continental crust of North China Platform,which shows the characteristic of gold deficit geochemical field.Moreover,the results also show that the gold geochemical background feild of the Jiaodong group is characterized by higher average Au abundance in the central area (1.35×10-9) and lower average Au abundance in the east and west of the Jiaodong area (0.95×10-9 and 0.76×10-9).The average abundance of Au element in the fresh rock samples of different rock types (Jiaodong Group,0.79×10-9;Mesozoic granites,0.77×10-9;Gabbro,0.63×10-9;Lamprophyre,0.93×10-9;Acidic dykes,0.82×10-9) from the deep drilling holes is lower than that of Clark value of continental crust and the value of continental crust of North China Platform,which also display the characteristic of gold geochemical deficit field.Therefore,there exists an Au element geochemical deficit field in the Jiaodong ore-concentrating area,combined with the evidence of hydrothermal activities in gold ore areas,we think the Jiaodong Group and the Mesozoic granite might partly provide the source of metallogenic materials for the formation of gold deposits in the Jiaodong area.

Keywords: geochemical background field ; gold abundance ; material resource ; gold ore-concentrating area ; deep drilling ; Jiaodong

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本文引用格式

陈玉民, 曾庆栋, 孙之夫, 王昭坤, 范宏瑞, 肖风利, 褚少雄. 胶东金地球化学背景研究[J]. 黄金科学技术, 2019, 27(6): 791-801 doi:10.11872/j.issn.1005-2518.2019.06.791

CHEN Yumin, ZENG Qingdong, SUN Zhifu, WANG Zhaokun, FAN Hongrui, XIAO Fengli, CHU Shaoxiong. Study on Geochemical Background Field of the Gold Deposits in Jiaodong,China[J]. Gold Science and Technology, 2019, 27(6): 791-801 doi:10.11872/j.issn.1005-2518.2019.06.791

胶东金矿集区是仅次于南非兰德金矿区和乌兹别克斯坦穆龙套金矿区的世界上第三大金矿区,已探明金资源量超过4 500 t[1]。胶东金矿集区由招远—莱州成矿带、蓬莱—栖霞成矿带和牟平—乳山成矿带组成(图1)。其中,招远—莱州成矿带金矿资源规模最大,目前探明资源储量超过3 400 t[2]。胶东金矿主要类型可划分为3类:蚀变岩型、石英脉型和层间滑动角砾岩型。这些金矿均受断裂控制[3,4,5,6,7],金矿床形成时代基本一致,均形成于早白垩世[8,9]。已有研究认为,在早白垩世,构造体制由挤压向伸展转变引起大规模岩浆—流体作用,并在短时间内爆发大规模金成矿[9,10]。但在成矿物质来源研究方面,学者们强调该区成矿物质来源具多源性[8],但这些认识以推断为主[11,12,13]。目前,对于胶东金矿成矿物质来源研究取得的认识主要分为2种,即深部岩浆来源[13,14,15,16,17,18]和古老变质岩来源[11,17,19,20]。成矿物质来源是金矿成矿作用研究中的重要内容和前沿科学问题,区域金地球化学丰度研究对于区域金成矿物质来源探讨具有重要理论意义。因此,针对胶东金矿集区成矿物质来源尚未取得统一认识的科学问题,开展了地球化学研究,以期为该区成矿作用机制研究提供参考。

1 胶东地区地质概况

胶东地区位于华北克拉通东南缘,由胶北地体和苏鲁地体组成,二者以烟台—青岛—五莲断裂为界(图 1)。苏鲁地体位于大别—苏鲁超高压变质带的北东部,主要由新元古代含榴辉岩花岗质片麻岩和中生代花岗岩组成[21]。胶北地体包括胶北隆起和胶莱盆地2个部分,胶东 90%以上的金矿床产于胶北隆起内。区内前寒武纪基底为新太古代胶东群和花岗质片麻岩,古元古代粉子山群和荆山群,以及新元古代蓬莱群。胶莱盆地内地层主要由早白垩世莱阳群砾岩和富钙页岩、早白垩世青山群火山岩以及晚白垩世王氏群砾岩和砂岩组成[22]。胶东地区断裂发育,包括三山岛、焦家、招平和牟乳等断裂带,为区内主要的控矿与成矿构造[23,24,25]。区内中生代花岗岩广泛分布,包括玲珑、郭家岭、滦家河、鹊山、昆嵛山、艾山和伟德山等岩体,岩体形成时代有晚三叠世、晚侏罗世和早白垩世,且以晚侏罗世岩体最为发育,金矿主要发育于晚侏罗世花岗岩和早白垩世花岗岩中,与早白垩世花岗岩具有成因关系[21,26,27,28,29,30]

图1

图1   胶东金矿地质简图及金地球化学采样点位置(据陈玉民等[10]修改)

1.第四系;2.元古宙岩石;3.太古宙岩石;4.超高压变质岩石;5.早白垩世火山岩;6.早白垩世花岗岩;7.早白垩世花岗闪长岩;8.晚侏罗世花岗岩;9.晚三叠世花岗岩;10.主要断层;11.蚀变岩型金矿床;12.石英脉型金矿床;13.层间破碎带角砾岩型金矿床;14.采样点及编号;15.三山岛金矿深钻位置

Fig.1   Geological sketch map of the gold deposits in Jiaodong area and sampling location of the gold geochemical samples(modified after Chen,et al[10]


根据金矿产出环境及特征,胶东地区金矿可划分为3种类型,即蚀变岩型(“焦家式”)、石英脉型(“玲珑式”)和层间滑动角砾岩型(“蓬家夼式”)金矿,在成因上目前统称为克拉通破坏型金矿[9]。石英脉型金矿以产状陡倾、受高角度断层控制为特征,如玲珑、邓格庄和金青顶金矿等;蚀变岩型金矿以产状低缓、受区域缓倾斜主干断裂带控制为特征,如三山岛、焦家、新城和大尹格庄金矿等;层间滑动角砾岩型金矿以产状低缓、受胶莱盆地北缘盆地底部与基底之间或附近层间滑动断裂控制为特征,如蓬家夼、大庄子、辽上和西涝口金矿等。

2 样品采集及分析方法

2.1 样品采集

岩石的微量元素分析研究是区域地球化学背景研究的重要内容,也是探索成矿物质来源的重要途径之一。要准确获得某一区域成矿元素背景场并确定异常范围,取样地段的选择极为重要,原则上要避开异常区段,否则所获取的结果只是异常的反映,并不能反映区域背景场的特征。

为研究胶东地区成矿元素地球化学背景场的特点,对胶东地区主要地质体(如玲珑花岗岩、郭家岭花岗岩和胶东群变质岩等)进行了采样,采样点原则上要远离已知矿区,采集新鲜岩石样品,以保证样品分析结果能够代表背景值。本次在研究区采集各类岩石样品103件,采样位置见图1。同时,对山东黄金集团实施的6个深钻也开展了系统的样品采集工作:ZK963钻孔,孔深2 024.91 m,采集样品76件;ZK964钻孔,孔深1 856.01 m,采集样品49件;ZK965钻孔,孔深4 006.03 m,采集样品142件;ZK966钻孔,孔深2 755.7 m,采集样品76件;ZK564钻孔,孔深2 059 m,采集样品40件;ZK1121钻孔,孔深2 738.57 m,采集样品106件。6个深钻采集样品合计489 件。

对所采集的样品进行分析,分析元素包括Au、Ag、Sn、B、Cu、Pb、Zn、Cr、Co、Ni、Mo、W、V、Bi、Mn、Ti、As、Sb和Hg共19种。经初步处理分析可知,与金成矿相关性较好的成矿元素只有Ag,其他元素与金相关性较差或没有相关性,因此,本文主要讨论胶东地区金的地球化学异常特征。

2.2 金分析方法

将样品磨至0.074 mm,经高温(650 ℃)灼烧、1∶1王水分解后,在王水溶液的体积分数为15%的介质中,用聚氨脂泡沫塑料吸附分离,在沸水浴中用硫脲溶液解脱。对胶东各主要地质体(岩石)金地球化学背景研究样品试液用石墨炉原子吸收光谱仪(ICE3400型,赛默飞世尔公司)直接测定金的质量分数。对于在矿化蚀变带采集的金含量高的样品试液采用火焰原子吸收光谱仪(WFX110B型,北京瑞利仪器公司)直接测定金的质量分数。样品测试分析在河北省区域地质矿产调查研究所实验室完成,金分析精度为0.01×10-9

3 分析结果

3.1 胶东区域岩石样品金分析结果

胶东地区地表样品采样位置见图1。区域上,胶东地区地表不同地质单元代表性岩石样品分析统计结果(表1)表明:(1)不同区域胶东群变质岩金丰度有所差别,胶西北地区和胶东东部地区胶东群变质岩的金含量(胶西北地区金丰度均值为0.76×10-9N=6;胶东东部地区金丰度均值为0.95×10-9N=12)明显低于胶东中部地区变质岩的金含量(胶东中部地区金丰度均值为1.35×10-9N=15);(2)整个胶东地区花岗岩类中金含量变化不大,均值较低。其中,胶西北玲珑花岗岩金丰度平均值为0.73×10-9N=41),郭家岭花岗岩金丰度平均值为0.69×10-9N=7);胶东东部中生代花岗岩中金丰度平均值为1.18×10-9N=18);中基性脉岩金丰度平均值为0.63×10-9N=3)。考虑整个胶东地区,地表花岗岩类样品的金丰度均值具有地区不均一性,表现为胶东西北部地区花岗岩类Au元素含量均值低于胶东东部地区。

表1   胶东地区地表样品Au元素地球化学分析结果统计

Table 1  Statistical of geochemical analysis results of gold element of the surface samples in Jiaodong area

岩石类型w(Au)/(×10-9w(Au)最小值/(×10-9w(Au)最大值/(×10-9样品数量/件样品采集地区
胶东群变质岩0.760.471.086胶西北(莱州—招远)
荆山群大理岩0.720.550.92胶西北(莱州—招远)
玲珑花岗岩0.730.431.2641胶西北(莱州—招远)
郭家岭花岗岩0.690.480.957胶西北(莱州—招远)
中基性岩脉0.630.610.643胶西北(莱州—招远)
胶东群变质岩1.350.533.5315胶东中部(栖霞)
胶东群变质岩0.950.721.5812胶东东部(牟乳—文登)
中生代花岗岩1.180.526.3518胶东东部(牟乳—文登)
大陆地壳1.21中国东部
华北地台大陆地壳1.01 207华北地台

注:大陆地壳数据据韩吟文等[31];华北大陆地壳数据据迟清华等[32]

新窗口打开| 下载CSV


3.2 三山岛金矿深钻样品金分析结果

三山岛金矿钻孔样品采自6个深钻(钻孔编号分别为ZK963、ZK964、ZK965、ZK966、ZK1121和ZK564),深钻中不同岩性样品分析统计结果(表2图2)表明:不同岩石类型金含量存在差异。其中,蚀变岩样品的金丰度最高,均值为152.3×10-9N=108)。其他岩石类型,如胶东群变质岩(金丰度均值为0.79×10-9,N=94)、中生代花岗岩(金丰度均值为0.77×10-9N=209)、辉长岩(金丰度均值为0.63×10-9N=18)、煌斑岩(金丰度均值为0.93×10-9N=10)和酸性脉岩(均值为0.82×10-9N=13)的金平均丰度接近。

表2   胶西北三山岛金矿深钻样品Au元素分析结果统计

Table 2  Statistical of gold element analysis results of rock core samples of the deep drill holes from the Sanshandao gold deposit,northwest Jiaodong

岩性w(Au)/(×10-9w(Au)最小值/(×10-9w(Au)最大值/(×10-9样品数量/件样品采集地区
胶东变质岩0.790.281.8994胶西北三山岛金矿
中生代花岗岩0.770.262.50209胶西北三山岛金矿
蚀变岩152.300.335 520108胶西北三山岛金矿
辉长岩0.630.301.6418胶西北三山岛金矿
煌斑岩0.930.461.8310胶西北三山岛金矿
酸性脉岩0.820.331.4513胶西北三山岛金矿
大陆地壳1.21中国东部
华北地台大陆地壳1.01 207华北地台

注:大陆地壳数据据韩吟文等[31];华北大陆地壳数据据迟清华等[32]

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图2

图2   三山岛金矿区深钻孔柱状简图及金丰度图

1.胶东群变质岩;2.中生代花岗岩;3.煌斑岩;4.辉长岩;5.酸性岩脉;6.蚀变岩;7.地质界线;8.样品散点图

Fig.2   Columnar diagram and gold abundance map of the deep drill holes in Sanshandao gold mine area


4 胶东矿集区金来源讨论

作为全球最重要的世界级金矿集中区之一,胶东金矿集区一直受到中外学者的广泛关注,在金矿成矿作用的某些方面已取得一系列共识。目前普遍认为胶东地区金矿床的形成与中生代构造—岩浆活动密切相关[8,12];胶东地区金成矿作用普遍发生于晚中生代(130~110) Ma[8,15];金矿形成于中生代洋壳俯冲或陆陆碰撞造山过程中挤压向伸展转变的构造体制[8,14,15]。然而,目前对于胶东金矿床成矿物质来源的研究仍颇具争议,已成为学术争论的焦点。关于胶东金矿成矿物质来源的研究,前人主要采用多维稳定同位素(S、Pb、H、O、C、He和Ar)示踪方法[33,34,35,36,37,38,39,40]和不同地质体含金性与金成矿关系2个视角[41,42,43],来探讨矿集区金矿床成矿流体特征和成矿物质的来源,并形成以下主要观点:(1)地幔流体来源[16,36];(2)胶东群变质岩来源[33,34];(3)中生代白垩纪岩浆热液来源[35]

尽管前人对胶东地区不同地质体的含金性进行过少量研究[20,33,34,35,36,38,39,40],但其测量值明显偏高(表3),据此许多学者认为含金较高的胶东群变质岩是金的主要来源。对于这些分析结果,虽然无法获得其分析技术方法,也无法判别其准确性,但其分析结果与迟清华等[32]对华北地台主要变质岩大量分析测试结果差别巨大(表3)。本次研究从区域和矿区2个尺度进行。在野外区域样品采集过程中,严格保障样品无明显的肉眼尺度的矿化蚀变现象。室内对采集样品进行显微镜下观察,选择新鲜样品进行原生晕岩石地球化学分析测试。

表3   胶东地区主要岩石、中国东部变质岩和火成岩及华北地台主要变质岩含金丰度

Table 3  Gold abundances of the major rocks in Jiaodong area,metamorphic rocks and igneous rocks in east China,and major metamorphic rocks in North China Platform

岩性样品数量/件w(Au)/(×10-9资料来源
胶东群斜长角闪岩1212.17张韫璞等[44]
胶东群斜长角闪岩7024.2杨士望[20]
胶东群斜长角闪岩9163朱奉三[45]
胶东群斜长角闪岩4姚凤良等[46]
胶东群斜长角闪岩455杨敏之等[47]
胶东群黑云变粒岩22.5杨敏之等[47]
胶东群二云片岩412杨敏之等[47]
胶东群变粒岩7170杨敏之等[47]
胶东群斜长角闪岩621杨敏之等[47]
玲珑花岗岩444.5姚风良等[46]
郭家岭花岗岩306.1姚风良等[46]
煌斑岩315姚风良等[46]
荆山群斜长角闪岩10202杨敏之等[47]
荆山群斜长浅粒岩4150杨敏之等[47]
荆山群石榴石大理岩325杨敏之等[47]
荆山群云母条带大理岩391杨敏之等[47]
荆山群云母片岩330杨敏之等[47]
荆山群黑云石英片岩418杨敏之等[47]
华北地台变粒岩3951.0迟清华等[32]
华北地台麻粒岩3171.4迟清华等[32]
华北地台斜长角闪岩3381.2迟清华等[32]

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区域地球化学场研究表明:(1)胶东地区地表不同地区各地质单元岩石金含量有所差别,胶西北地区和胶东东部地区胶东群变质岩的金含量(金丰度均值分别为0.76×10-9和0.95×10-9)明显低于胶东中部地区胶东群变质岩的金含量(金丰度均值为1.35×10-9)。同时,胶东中部地区胶东群变质岩的金丰度平均值为1.35×10-9N=15),与大陆地壳克拉克值相近(1.21×10-9);(2)胶东东部及西部胶东群变质岩的金丰度明显低于大陆克拉克值(1.21×10-9[31],也低于华北地台大陆地壳金丰度(1.0×10-9[32]。上述规律表明:在金的区域成矿过程中,在金矿集聚区胶东群变质岩形成了一个区域地球化学亏损场。胶东群变质岩Au元素地球化学异常整体显示出中部高、东部及西部低的异常特征。在金矿集区内虽然采集样品没有明显蚀变,但无论变质岩还是中生代花岗岩体内都会或多或少存在热液活动的迹象,如小石英脉和碳酸盐脉等,而远离矿区则不发育这些现象,结合胶东群变质岩金地球化学异常场特征,在金的区域成矿过程中,胶东群变质岩中的金可能受到热液萃取作用,为金成矿提供了部分物质。

三山岛成矿带深钻样品分析结果表明:靠近成矿带的蚀变花岗岩含金丰度最高,均值为152.3×10-9N=108)。其他岩石类型,如胶东群变质岩(金丰度均值为0.79×10-9N=94)、中生代花岗岩(金丰度均值为0.77×10-9N=209)、辉长岩(金丰度均值为0.63×10-9N=18)、煌斑岩(金丰度均值为0.93×10-9N=10)和酸性脉岩(金丰度均值为0.82×10-9N=13)的金丰度均值均低于大陆地壳的金丰度值(1.21×10-9[31]及华北地台大陆地壳金的克拉克值(1.0×10-9[32]。深部钻孔岩芯(2 000~4 000 m)观察表明,胶东群变质岩、玲珑花岗岩和郭家岭花岗岩中均存在较明显的热液活动迹象,发育较多的细小且不规则的石英脉、石英—碳酸盐脉和碳酸盐脉,反映了4 km范围内均存在热液活动现象(图3)。同时,分析结果表明,钻孔中不同岩石类型金的地球化学丰度远低于靠近矿化带蚀变岩的金丰度平均值,也低于华北地台大陆地壳的金丰度值,显示出明显的金地球化学亏损场特点。上述现象及分析结果可能反映热液作用萃取了围岩中的部分金并进入成矿溶液,迁移至断裂带富集成矿,因此,胶东群变质岩和中生代花岗岩可能为胶东地区大规模金矿成矿作用提供了重要的成矿物质。

图3

图3   胶西北三山岛矿区深钻(ZK965)围岩中热液活动细脉

(a)混合岩化片麻岩中发育石英—方解石脉(125 m深处);(b)玲珑花岗岩中发育石英—绿泥石脉和硅化(1 320.92 m深处);(c)变形玲珑花岗岩中发育石英细脉(1 989.72 m深处);(d)玲珑花岗岩中发育滑石脉(2 150 m深处)

Fig.3   Fine veins of the hydrothermal activities from the deep drill rock core (ZK965) in Sanshandao gold mine area,northwest Jiaodong


胶东区域金地球化学背景场特征与胶西北三山岛矿区尺度金地球化学场耦合良好,指示胶东矿集区周围存在金的地球化学亏损场,同时,矿区内围岩普通存在热液活动的迹象,围岩中金可能被胶东地区中生代大规模岩浆热液作用萃取并进入热液,在有利构造部位富集成矿。

5 结论

(1)胶东群变质岩金区域地球化学场具有胶东中部地区金丰度相对高(1.35×10-9)、胶东东部和西北部金丰度均值相对低(0.95×10-9和0.76×10-9)的特征,金矿集区胶东群变质岩金丰度平均值低于地壳克拉克值和华北地台大陆地壳金丰度值,表明胶东地区金矿集区存在金的地球化学亏损场;胶东西北部玲珑花岗岩金丰度为0.73×10-9,郭家岭花岗岩金丰度为0.69×10-9,均低于华北地台大陆地壳丰度值(1.0×10-9),也表明胶东金矿集区存在金的地球化学亏损场。

(2)胶西北三山岛金矿深钻样品Au元素原生晕研究表明,除靠近成矿带的蚀变岩(金丰度均值为152.3 ×10-9)外,各类岩石样品(胶东群变质岩金丰度均值为0.79×10-9;中生代花岗岩金丰度均值为0.77×10-9;辉长岩金丰度均值为0.63×10-9;煌斑岩金丰度均值为0.93×10-9;酸性脉岩金丰度均值为0.82×10-9)的金丰度均值均低于华北地台大陆地壳金丰度,指示矿区尺度存在金的地球化学亏损场。

(3)胶东地区地表和深钻样品Au元素地球化学异常特征具有良好的耦合性,表明胶东地区金矿集区存在金地球化学亏损场,结合矿区内围岩中普遍存在的热液活动迹象,认为胶东群变质岩和中生代花岗岩可能为胶东地区金矿成矿作用提供了重要的成矿物质。

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