| 黑龙江省东宁县金厂金矿石英和闪锌矿激光40Ar-39Ar法年龄及其找矿意义 |
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| 引用本文： | 卿敏,唐明国,肖力,赵玉锁,韩先菊.黑龙江省东宁县金厂金矿石英和闪锌矿激光40Ar-39Ar法年龄及其找矿意义[J].地质与勘探,2012,48(5):991-999. |
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| 作者姓名： | 卿敏 唐明国 肖力 赵玉锁 韩先菊 |
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| 作者单位： | 武警黄金地质研究所,河北廊坊,065000 |
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| 基金项目： | 全国危机矿山典型矿床及成矿规律总结研究项目“晋东北-内蒙古中部地区火山岩型金多金属矿床成矿规律总结研究 |
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| 摘 要： | 黑龙江省东宁县金厂金矿是滨太平洋成矿域浅成低温-斑岩成矿系统中极具代表性的特大型金矿床。矿区已发现爆破角砾岩筒型、环状一放射状裂隙充填型、似层状微细脉浸染型和断控构造破碎带蚀变岩型等矿化类型。为确定成矿时间，作者应用高精度单颗粒激光熔蚀氩氩法，选择Ⅻ号破碎带蚀变岩型矿体中多金属硫化物一石英脉中石英和J-9号爆破角砾岩筒型矿体中闪锌矿进行年龄测定。获得Ⅻ号矿体石英40Ar/39Ar等时线年龄为119±5Ma（MSWD：6．3），J-9号矿体闪锌矿40Ar/39Ar等时线年龄为129±0．8Ma（MSWD=3．7），限定了成矿作用的上限。结合最新获得的相关成矿地质体精细年代学成果，进一步认定金厂金矿成矿时代为燕山晚期，成矿与同时代闪长玢岩一花岗闪长斑岩关系密切。金厂金矿成岩、成矿环境具备寻找富金斑岩型铜矿的有利条件，与成矿关系密切侵入岩呈岩脉、岩枝状，指示矿区剥蚀程度浅，深部还有发现斑岩型Au（cu）矿化的可能。
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| 关 键 词： | 激光40Ar-39Ar年龄 石英 闪锌矿 找矿 金厂金矿 黑龙江省东宁县 |
Automatic Laser Probe 40Ar/39Ar Isochron Ages of the Quatrz and Sphalerite from the Jinchang Gold Deposit, Dongning County, Heilongjiang Province, and their Prospecting Implications |
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| QING Min,TANG Ming-guo,XIAO Li,ZHAO Yu-suo,HAN Xian-ju.Automatic Laser Probe 40Ar/39Ar Isochron Ages of the Quatrz and Sphalerite from the Jinchang Gold Deposit, Dongning County, Heilongjiang Province, and their Prospecting Implications[J].Geology and Prospecting,2012,48(5):991-999. |
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| Authors: | QING Min TANG Ming-guo XIAO Li ZHAO Yu-suo HAN Xian-ju |
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| Institution: | (Gold Geological Institute of CAPF,Langfang,Hebei 065000) |
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| Abstract: | The Jinchang gold deposit in Dongning County of Heilongjiang Province is a typical super-large gold deposit in the epithermal-porphyry mineralization system of the Pacific marginal metallogenic mega-province.The mineralized rock bodies can be classified into four types:breccia type,ring-radial fault-controled vein type,layered-like micro-vein and disseminated type,and fractured alteration type.To determine the metallogenic age,we measured the age of the quartz of polymetallic sulfide-quartz in No.Ⅻ fracture altered ore body,and the sphalerite in No.J-9 explosive breccia pipe ore body by the high-precision single-grain Ar-Ar laser probe method.The results show that the 40Ar/39Ar isochron age for the quartz from the No.Ⅻ ore body is (119±5) Ma (MSWD=6.3),and the 40Ar/39Ar isochron age of the sphalerite from the No.J-9 ore body is (129±0.8) Ma (MSWD=3.7).Combining with the latest available detailed chronology of the related geological bodies,we confirm that the metallogenic age of the Jinchang gold deoposit is in the late Yanshanian,and its mineralization has a close relationship with the contemporary diorite-granodiorite porphyries.The diagenetic and metallogenic environment of the Jinchang gold deposit provides a favorable condition to search for gold-rich porphyry type copper deposits,where the intrusive rocks associated with mineralization exhibit the shape of dikes and branches,indicative of a low erosion degree,implying a great possibility to discover deep-seated porphyry type Au(Cu) mineralization. |
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| Keywords: | automatic laser probe 40 Ar-39 Ar age quartz sphalerite prospecting Jinchang Gold Deposit Dongning County of Heilongjiang Province |
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