The Origin of Pb-Zn Deposits in the Northern Kuandian Area, Liaoning Province

1 Regional geologyThere are a series of lead -- zinc deposits in theLiao-ji paleo-rift, for exarnple, the Kumduk Pb -- Zndeposit of Korea, the Huanggoushan Pb -- Zn depositof Jilin Province, the Qingchengzi Pb -- Zn dePOsitand Beiwagou Pb -- Zn deposit of…     

宽甸北部早元古宙铅锌矿地质特征及成因讨论

辽宁宽甸北部早元古宙铅锌矿位于辽东青城子—吉林荒沟山—朝鲜检德铅锌矿带上。赋存于辽东优、冒地槽的过渡带,靠近优地槽一侧的碳酸盐岩建造中。矿体受岩相、岩性控制明显,属层控矿床。吕梁构造旋回的变质变形作用对矿带的改造不明显。矿带的同位素特征表明,张家堡子铅锌矿形成于封闭盆地环境,矿质来源于大陆边缘深部液态矿源层;而高丽墓子铅锌矿带则形成于正常海洋环境,表现了明显的原始沉积矿床的特点。     

广西新路锡矿田某些成矿特征的探讨

本文通过野外调查、矿床地质特征和岩矿测试资料研究,探讨了新路锡矿田的成矿物质来源,主要成矿地层岩石特征和锡石的铌钽含量特征。据硫、氧、铅同位素组成特征及其它地质事实为论据,认为新路锡矿田成矿物质锡主要源自花岗岩,而铅、锌源自地层,成矿热液主要为岩浆热液。对地层岩石特征研究表明,有利成矿层位主要是信都组上段顶部至东岗组下、中段与融县组,其岩石组合是由碎屑岩—碳酸盐岩过渡地段,或碳酸盐岩,它不仅有利于充填交代成矿,而且对矿床伴生铅、锌起到矿源层作用。据矿床中锡石单矿物的铌、钽含量、Ta/Nb比值与其它矿床的对比结果认为:①六合坳矿床形成于弱酸性—碱性介质环境,成矿温度较高:②白面山矿床形成于相对偏酸性介质环境中,成矿温度稍低,这个结论与其它方法得出的结果一致。     

Pb Isotope Compositions of Shibaqinghao Gold Deposit in Central Inner Mongolia, China

There are two types of gold ore in Shibaqinghao gold deposit, a mylonite ore and a quartz - vein ore. Pb isotope compositions for mylonite ore are characterized by lower Pb isotope ratios ranging from 16.63 to 17.45 (206Pb/204Pb), 15.31 to15.48 (207Pb/204pb), 36.52 to 38.85 (208Pb/204Pb). They are scattered very close to a model curve of the mantle evolution. These ratios suggest that gold in the mylonite ore might be derived from the country rocks, which originated directly in the upper mantle. Pb isotope compositions for quartz - vein ore are characterized by higher Pb isotope ratios ranging from 18.23 to 19.74 (206Pb/204Pb), 15.69 to 15.89 (207Pb/204Pb), 38.64 to 40. 13 (208Pb/204Pb). They are scattered very close to a model curve of the upper crustal evolution. These facts indicate that the gold in the quartz - vein ore might be related to some granitic magma generated in the crust.     

太行山南段平顺铁矿成矿地质特征及找矿预测

通过对太行山南段平顺铁矿矿区构造特征及岩浆岩的动力学分析研究,认为第一岩浆岩带属于被动侵位机制,岩体内部成矿潜力较大;第二岩浆岩带为主动侵位机制,背斜核部及岩体与围岩的接触部位为有利成矿区。同时根据岩石、矿石的稀土元素、微量元素、Pb同位素特征及矿体与岩体的关系,认为晚期闪长岩是主要的成矿母岩,但早期基性—超基性岩间接为铁矿的形成提供了一定的物质来源;矿体的形态明显受到接触面及周边构造形态的控制,呈不规则板状、透镜状、分枝状、羽状分布。最后运用矿体成矿规律、磁异常、电法异常等找矿预测方法,在研究区内圈出了龙降沟岩体南缘、双井、东郊3个找矿预测区。     

Pb Isotope Compositions of Shibaqinghao Gold Deposit in Central Inner Mongolia,China

There are two types of gold ore in Shibaqinghao gold deposit, a mylonite ore and a quartz - vein ore. Pb isotope compositions for mylonite ore are characterized by lower Pb isotope ratios ranging from 16. 63 to 17.45 (206Pb/204Pb) , 15. 31 tol5.48 (207Pb/204Pb) , 36.52 to38.85 (208Pb/204Pb). They are scattered very close to a model curve of the mantle evolu-tion. These ratios suggest that gold in the mylonite ore might be derived from the country rocks, which originated directly in the upper mantle. Pb isotope compositions for quartz - vein ore are characterized by higher Pb isotope ratios ranging from 18.23 to 19.74 (206Pb/204Pb) , 15. 69 to 15. 89(207Pb/204Pb) , 38. 64 to 40. 13 (208Pb/204Pb). They are scattered very close to a model curve of the upper crustal evolution. These facts indicate that the gold in the quartz - vein ore might be relat-ed to some granitic magma generated in the crust.     

辽西火山岩型金矿地质特征及成因讨论

辽西火山岩型金矿分布在中生代陆相火山盆地边缘活动带内,受辽西弧形构造带控制,为火山期后热液矿床,可初步划分为3种成因类型:次火山(斑岩)热液型(二道沟式),火山—次火山热液型(红石砬子式)和爆发角砾岩型(水泉式),成矿作用与中酸性火山—次火山岩关系密切,成矿时代为燕山期(90—110Ma)。稳定同位素研究结果表明,含矿热液为富含挥发组份和多金属成矿元素的富金水溶液,来源于地壳深部或上地幔,即高温热卤水对镁铁质、超镁铁质岩石长期侵蚀、淋滤和溶解,获取大量的金属成矿元素,在不透水层之下形成深部液态矿源层。     

Sulphur Isotope Compositions of Shibaqinghao Gold Deposit in Central Inner Mongolia, China

Shibaqinghao gold deposit is situated in the western part of the northern margin of the North China Craton. It is controlled by an E - W trending tectonic zone that is located in the middle unit of Dongwufenzi group which consists of a sequence of greenschist - facies metamorphic rocks in an Archean greenstone belt.In Shibaqinghao gold deposit there are two types of gold ore, a mylonite ore and a quartz vein ore. Mylonite ore bodies were formed during ductile shearing stage in the Early Proterozoic, whereas quartz vein ore bodies might have been formed in the Mesozoic time.Pyrite accompanied with native gold in the mylonite ore has sulpfur of which δ34S values range from - 5.8 to + 0.8 per mil, similar to the values of mantle- derived sulphur. These data suggest that gold in the mylonite ore be derived from the country rocks which originated directly in the upper mantle.Pyrite in quartz vein ore has the δ34 S values between + 3.0 and + 11.0 per mil, similar to the values of some granitic rocks. These facts indicate that the gold in the quartz vein ore is related to some granitic magma generated in the crust.This study revealed that two different mineralization occurred at different geological times and in different environments but in the same place, resuling in the Shibaqinghao gold deposit.     

Pb Isotope Compositions of Shibaqinghao Gold Deposit in Central Inner Mongolia, China

1ＧｅｏｌｏｇｉｃＳｅｔｔｉｎｇＳｈｉｂａｑｉｎｇｈａｏｇｏｌｄｄｅｐｏｓｉｔｉｓｓｉｔｕａｔｅｄｉｎｔｈｅｗｅｓｔｅｒｎｐａｒｔｏｆｔｈｅｎｏｒｔｈｅｒｎｍａｒｇｉｎｏｆｔｈｅＮｏｒｔｈＣｈｉｎａＣｒａｔｏｎ .ＩｔｉｓｃｏｎｔｒｏｌｌｅｄｂｙａｎＥ -ＷｔｒｅｎｄｉｎｇｔｅｃｔｏｎｉｃｚｏｎｅｔｈａｔｉｓｌｏｃａｔｅｄｉｎｔｈｅｍｉｄｄｌｅｕｎｉｔｏｆＤｏｎｇｗｕｆｅｎｚｉＧｒｏｕｐ ,ｗｈｉｃｈｃｏｎｓｉｓｔｓｏｆａｓｅｑｕｅｎｃｅｏｆｇｒｅｅｎｓｃｈｉｓｔ -ｆａｃｉｅｓｍｅｔａｍｏｒ ｐｈｉｃｒ…     

南秦岭碧口群岩石组合特征及其构造意义

碧口群是扬子板块西北缘中晚元古代古海沟—岛弧体系的重要组成部分。岩石组合、岩石化学及稀土元素特征研究表明,其下部为蛇绿岩组合,以大洋E型拉斑玄武岩为特征,代表古俯冲杂岩;上部为重力流沉积组合,以火山质碎屑浊积岩及陆源碎屑浊积岩为特征,类似于海沟型复理石组合,代表古海沟堆积。同时构造变形及变质作用特征表明,在蛇绿岩分布区发育有大型韧性剪切带和高压低温变质的蓝闪片岩。由此可见碧口群属于中晚元古代扬子板块西北缘的古海沟—俯冲地体。     

陕西旬阳县红花坪铅锌矿地质特征及找矿前景

红花坪铅锌矿位于南秦岭旬阳盆地金铜、铅锌、汞锑等多金属成矿带内,为一沉积-改造型铅锌矿床。矿区出露地层主要为古生界泥盆系和志留系一套浅变质的细碎屑岩和碳酸盐岩沉积建造,褶皱、断裂发育,热液活动强烈,为成矿物质的活化、运移创造了良好的条件。矿体赋存于下志留世梅子垭组绢云千枚岩及下部石英脉中,受一定的地层岩性、古地理环境和构造控制。目前Ⅰ-1铅锌矿体控制长度已超过1 km,矿体连续性好,形态单一,矿物成分简单,锌含量高,有望成为一中型规模的铅锌矿床。     

党河南山组与格曲组的建立

党河南山组是指分布于党河南山和疏勒南山等地、位于阿木尼克组之上的地层体。下部为兰灰色、白色石膏层,杂色泥岩及粉砂岩;上部为灰—深灰色泥灰岩、白云岩及灰岩,含腕足、珊瑚等化石。其界线层型下部以石膏层的始现与下伏阿木尼克组碎屑岩整合分界;上部以本组碳酸盐岩的消失与上覆羊虎沟组、巴音河群或下环仓组分别为假整合或不整合接触作为分界。格曲组是指分布于东昆仑山—阿尼玛卿山的一套碎屑岩及灰岩沉积的地层体。下部为碎屑岩段,主要由灰—灰绿色砾岩、岩屑砂岩、变砂岩、火山岩及板岩等组成,含腕足、双壳、菊石及植物化石;上部为灰岩段,主要由浅灰—灰黑色不纯灰岩、生物灰岩、砾状灰岩组成,偶见碎屑岩及火山岩夹层,丰含蜓、腕足及珊瑚等化石。大都未见底,有时与老地层呈假整合接触;未见顶,有时被新地层所不整合。     

从桂西地区金砷汞锑元素的区域分布探讨金的物质来源

文章分析对比了桂西地区Ａｕ、Ａｓ、Ｈｇ、Ｓｂ元素的时空区域分布,并经与岩石样对比,发现上古生界以碳酸盐岩为主的地层为高背景,三叠系为低背景,Ａｕ的高背景区呈ＮＷ向展布,这与右江裂谷区地壳演化的独特历史有关。桂西地区上古生界金主要来自深源,三叠系碎屑岩中金主要来自陆源。从Ａｕ元素丰度与存在形式考虑,高背景的碳酸盐岩夹泥岩、硅质岩、火山岩建造及毗邻的碎屑岩对金成矿更有利。     

Metallogenic origin of Sipingshan hot spring gold deposit in Hulin of Heilongjiang and its metallogenic mode

Sipingshan gold deposit is gold-bearing sillcalite in type. There only exist a few kinds of sulfide in the ore and it is lower in content. The gold degree is lower. Au is closely related to the Ag,Cu,Pb,As and Hg elements. The upper sillcalite has Eu and Ce negative anomaly,and the lower sillcalite has Eu positive anomaly. however,the hot spring cemented breccia and rhyolite porphyry have Eu negative anomaly;the S isotope component has deep-seated magmatic sulfur and terrestrial sulfate characteristic;and the Pb isotope has the character of the mixture origin of crust and mantle that is mainly dominated by Pb in the orogenic belt. The ore-forming fluid temperature is 180℃-244℃,characterized by magmatic hydrothermal and meteoric water;and the ore-forming age is 87 Ma. The deposit was formed by the metallogenic fluid in the tectonic fault zone overflowing near the earth’s surface and leading to the metallogenic function and the metallogenic substance deposition.     

青海省祁连县黑刺沟金矿地质特征及找矿前景

黑刺沟金矿区位于托莱山成矿带之中西部,区内NWW,NW,近NE向断裂及次级构造发育;成矿地质背景良好。为查明区内成矿地质条件,扩大找矿前景,采用激电中梯测量与探矿工程相结合的方法,圈定了8条矿化蚀变体13条金矿体,其中⑤号矿体是区内主要矿体,金品位(1.05～3.42)×10~(-6),平均品位1.59×10~(-6)。矿体呈透镜状、脉状,产状与断裂构造蚀变带产状基本一致,含矿岩石为凝灰质碎裂岩、构造角砾岩,围岩为早奥陶世阴沟群片理化凝灰岩、安山质凝灰岩,围岩蚀变主要为硅化、黄铁矿化、碳酸盐化、褐铁矿化。该文在阐述黑刺沟金矿床地质特征的基础上,总结了找矿标志和控矿因素,认为找矿潜力较大。     

即墨地区莱阳群底部止凤庄组地质特征及其碎屑锆石LA-ICP-MS U-Pb年龄地质意义

为了了解盆地沉积初期的物源特征,对位于胶莱盆地东缘即墨地区早白垩世莱阳群止凤庄组沉积特征、物质组成及碎屑锆石进行了U-Pb同位素测年研究。野外调查表明,止凤庄组为一套陆源碎屑沉积,具有近源沉积的特点。南泊一带止凤庄组底部碎屑岩碎屑锆石LA-ICP-MS U-Pb年龄介于233~734 Ma,年龄分布于5个区间,呈现明显的幕式特征,至少记录了2次重要的构造热事件。侵入于止凤庄组石英二长岩的锆石U-Pb加权平均年龄为(123.50±0.95)Ma,限定了止凤庄组地层沉积上限年龄为123.50 Ma。综合分析认为,止凤庄组物源主要来自苏鲁造山带,部分来自扬子板块。这有助于了解胶莱盆地沉积初期其物源区苏鲁造山带的地体情况。     

秦巴地区古生代构造特征分析

秦巴地区的构造单元若按习惯以五条深断层带为界划分成四个褶皱带,就使早古生代构造特征显得模糊不清。但若以下部构造层的特征为依据,以靖口关—丹凤—商南断裂带为界,划分为南北两个构造单元,就显得十分明晰。在早古生代推覆构造的控制下,晚古生代使南部构造单元中形成山间槽,发育了泥盆系层控铅锌矿床。     

Geology of Gold Ore Deposits in Western Linyi of Shandong Province,China

1IntroductionWestern Linyi of Shandong Province is one of the most important gold ore mineralization concen-tration areas. Tongjing skarn type gold copper de-posit, Jinchang skarn type gold copper deposit and Duijinshan porphyry type gold deposit were found in 1960's (Edited committee, 1996). Following the discovery of Guilaizhuang gold ore deposit related to alkaline rocks in 1988, the western Linyi region becomes one of the extensively studied areas of gold deposits in China (Lin etal.,…     

Geology of Gold Ore Deposits in Western Linyi of Shandong Province,China

Western Linyi of Shandong Province is one of the most important gold ore mineralization concentration areas. Mesozoic gold ore deposits in this area can be subdivided into two types: magmatic hydrothermal and epithermal gold deposits. The occurrences of gold ore bodies are controlled by structures. Related subvolcanic rocks can be subdivided into high potassium calc-alkali series and alkaline series. These two types of subvolcanic rocks are of different geochemical features and different sources. The high potassium calc-alkali rocks are derived from enriched mantle and contribute to the formation of magmatic hydrothermal gold ore deposits including skarn gold-copper ore deposit and porphyry gold ore deposit. Alkaline rocks are derived from lower crust and they host epithermal gold deposits. Comprehensive studies show that there is no evolutionary or transitional relationship temporally and genetically between the epithermal gold deposit and the high temperature magma hydrothermal gold deposit in the western Linyi.     

翁泉沟硼铁矿床地质特征

翁泉沟硼铁矿床赋存于早元古宙辽河群里尔峪组。原岩为一套在裂谷环境下形成的中酸性火山岩及碳酸盐岩。矿体的容矿岩石是镁质大理岩。矿体厚度与容矿岩石厚度呈正相关关系。矿石矿物有硼镁石、硼镁铁矿、遂安石等,伴生矿物达64种。根据矿石所含的矿物种类,翁泉沟硼铁矿床矿石类型可分为磁铁矿型、硼镁石型、硼镁石—磁铁矿型、含硼镁铁矿—硼镁石—磁铁矿型等4种类型。硼镁铁矿是在火山喷气和深海沉积作用下形成的层控火山沉积变质矿床。