Rare Earth Element and Trace Element Features of Gold-bearing Pyrite in the Jinshan Gold Deposit, Jiangxi Province

<正>Jinshan gold deposit is located in northeastern Jiangxi,South China,which is related to the ductile shear zone.It has a gold reserve of more than 200 tons,with 80%of gold occurring in pyrite. The LREE of gold-bearing pyrite is as higher as 171.664 ppm on average,with relatively higher light rare earth elements(LREE;159.556 ppm) and lower HREE(12.108 ppm).TheΣLREE/ΣHREE ratio is 12.612 and(La/Yb)_N is 11.765.These indicate that pyrite is rich in LREE.The(La/Sm)_N ratio is 3.758 and that of(Gd/Yb)_N is 1.695.These are obvious LREE fractionations.The rare earth element(REE) distribution patterns show obvious Eu anomaly with averageδEu values of 0.664,andδCe anomalies of 1.044.REE characteristics are similar to those of wall rocks(regional metamorphic rocks),but different from those of the Dexing granodiorite porphyry and Damaoshan biotite granite.These features indicate that the ore-forming materials in the Jinshan gold deposit derived from the wall rocks, and the ore-forming fluids derived from metamorphic water.The Co/Ni ratio(average value 0.38) of pyrite suggests that the Jinshan gold deposit formed under a medium-low temperature.It is inferred from the values of high-field strength elements,LREE,Hf/Sm,Nb/La,and Th/La of the pyrite that the ore-forming fluids of the Jinshan gold deposit derived from metamorphic water with ClF.     

云南东川播卡金矿区以往地质勘查资料的分析与评价

自1995年发现播卡金矿以后,许多地勘单位在矿区及其外围开展了大量的地质、物化探、遥感工作,获得了海量地质数据和信息,并形成大量地质勘查资料和研究报告。但由于基础地质研究程度较低、矿产勘查工作不规范、矿产地质研究薄弱,造成以往资料的可靠性、矿体的连接和资源量估算的合理性、次生晕化探资料的归纳与整理、勘查工程部署和钻孔化探工作等方面存在许多问题。针对这些问题,有必要系统整理分析区内以往地质勘查资料,并对已形成的各类地质资料进行二次开发。     

内蒙古陈巴尔虎旗四五牧场金矿地质特征及成因探讨

内蒙古陈巴尔虎旗四五牧场金矿与侏罗-白垩纪浅成-超浅成岩体关系密切,构造-岩浆热液在上侵过程中萃取部分基底岩系中的成矿物质,并在粗安质隐爆角砾岩中富集成矿。硫同位素分析表明部分成矿物质来源于围岩,包体测温表明成矿热液为低温热液,同位素测年结果表明成矿期在晚侏罗世-早白垩世。矿床为赋存于粗安质火山岩中、与侏罗-白垩纪火山-次火山活动有关的HS型浅成中低温热液型铜金矿。正磁异常区的低-负磁带状异常是矿化蚀变带的反映。具有一定规模、有明显浓集中心、浓度分带好、具明显分带的As-Sb-Ag-Hg-Au组合异常,伴有Cu,Pb,Zn,Bi异常,是寻找该类型铜金矿床的有利地段。     

店房火山角砾岩体西段金矿地质特征与成因

在近期的矿山接替资源找矿过程中,对店房金矿以西的角砾岩体西段勘查新圈定5条金矿体。金矿体的形态与产状严格受断裂构造控制,直接产于火山机构的环状、放射状构造和蚀变破碎带之中,矿石分为石英脉型和构造蚀变岩型,围岩蚀变以硅化和黄(褐)铁矿化为主,成矿作用分为2期4个阶段;稳定同位素和流体包裹体研究表明,成矿流体主要为幔源,并具低盐度和多源特点,以岩浆热液为主,成矿温度为中、低温,主成矿期为燕山晚期,店房角砾岩体西段金矿床属与火山构造有关的中、低温热液矿床。     

内蒙古喀喇沁旗金蟾山金矿床控矿断裂特征

金蟾山金矿位于内蒙古喀喇沁旗安家营子花岗岩体内的断裂中,矿区断裂构造分为东、西两个断裂群,以NNE向和近SN向脆性断裂为主,成群分布,控矿断裂形成于135～126Ma期间;成矿前表现为两组共扼的节理,成矿期近SN向和NNE向断裂、主断裂与派生断裂共同控矿。     

吉林省和龙市和安河金矿床地质特征及找矿方向

和安河金矿床是我队在吉林省东部金矿化集中区发现的金矿之一。通过地表工程的深部稀疏钻孔控制,确定为一小型金矿床。普查结果表明,矿化系统有一定延深。本文分析了金矿床地质特征及矿床成因,认为构造、岩浆活动在成矿过程中起着重要作用。和安河金矿勘查对在吉林省东部寻找金矿具有着指导意义,明确了本区找矿方向。     

桦甸市张家屯矿区石英脉型含金矿床地质特征简述

张家屯金矿床是吉林省有色金属地质勘查局六○六队受吉林省桦甸市鑫利隆矿业有限公司的委托,对桦甸市大楼矿区张家区段石英脉型含金银铅锌矿床进行详查评价工作,通过地表工程及旧坑道调查,目前确定为一小型金矿床。工作结果表明,矿化系统有一定延深。本文对金矿床地质特征及矿床成因分析,认为构造、岩浆活动在成矿过程中起着重要作用,对吉林省该区金矿找矿有着指导作用,明确了本区找矿方向。     

闽西北地区混合花岗岩类型划分及其与金成矿关系

根据闽西北混合花岗岩产出的大地构造位置、成岩物质来源及其与周围地质体的关系等研究,认为闽西北地区混合花岗岩总体上可分为区域型混合花岗岩和边缘型混合花岗岩2种类型。通过2类混合花岗岩的空间展布和特征对比,并对其形成机理及其与金成矿关系进行了初步探讨。     

小秦岭地区金矿成矿机理分析

小秦岭成矿带是我国重要的贵金属成矿带之一,金矿受地层、构造和岩浆岩控制,具有＂三位一体＂的成矿模式。太古宙太华群地层为成矿提供了物质基础,区域变质作用使金发生初次富集;早期自北而南的挤压形成规模巨大的推覆构造为含金石英脉的生成提供了有利空间;燕山期构造—岩浆活动对金的活化、迁移、富集起主导作用     

REE and Sr-Nd Isotope Geochemistry for Yixian Fluorite Deposit,Western Liaoning Province,China,and Its Geological Implications

Up to now,there were no systematic studies of geochemistry and isotopic age for the Yixian(义县) fluorite deposit,western Liaoning(辽宁) Province,China.Based on the analysis of metallogenic geological setting,we studied the REE,Rb-Sr and Sm-Nd isotopes.The chondrite-normalized REE patterns of fluorite are characterized by moderate LREE depletion(LREE/HREE=0.95-3.57,(La/Yb)N=0.08-2.84) and enrichment of Sr(146×10-6-596×10-6) and moderately positive Eu anomalies(δEu=1.10-1.34),which are similar to those of the ho...