新疆东天山康古尔塔格金矿带成矿作用的构造制约

康古尔塔格金矿带呈东西向展布于新疆东天山晚古生代造山带的中部，发育在秋格明塔什-黄山韧性剪切带的南缘，阿奇山-雅满苏火山岩带的北缘，形成的金矿床可划分为三种主要端元类型，即浅成低温热液型（热泉型）、剪切带交代蚀变岩型、与中浅成花岗岩类有关的石英脉型。金的成矿作用主要受控于二叠纪后碰撞阶段秋格明塔什-黄山大型韧性剪切带形成的右行走滑剪切系统，在剪切系统的不同构造部位由于应力应变状态的不同、岩石渗透率的不同、构造层次（深度）的不同等，导致成矿流体和成矿物质在组成比例上的差异，从而形成不同类型的金矿床。所有类型的金矿资源是在同一构造环境下相同区域成矿事件的产物，在不同构造部位产出的金矿床类型可以组成一个连续的金矿化系列。区域一级剪切构造带控制金矿带成矿物质和成矿流体的主要来源，二级剪切构造控制金矿床的发育，三级剪切裂隙系统控制金矿体（脉）的产出，从而构成三级构造控矿系统。     

新疆东天山红石金矿床成矿流体和成矿物质来源示踪

红石金矿床是新疆东天山康古尔塔格金矿带中的代表性矿床之一,本文对其进行了比较系统的流体包裹体和稳定同位素研究。流体包裹体研究结果表明,红石金矿床的成矿流体为中低温、低盐度、中低密度的富CO2流体。石英氢同位素组成δDSMOW为-104‰～-63‰,石英氧同住素组成δ^18OPDB为13.8‰～15.5‰、δ^18O水为-1.7‰～6.1‰。方解石碳同位素组成δ^13CPDR为-3.5‰～-2.7‰,方解石氧同位素组成δ^180PDB为-28.9‰～-26.5‰、δ^18OSMOW为1.1‰～3.5‰。H、O、C同位素组成特征指示红石金矿床成矿流体主要起源于深部,后期混合有大气水。黄铁矿硫同位素组成δ^34为-11.5‰～3.8‰,集中于0.4％～3.8‰,平均值为1.73‰,指示了成矿物质中的硫具有接近陨石硫的深源特征。红石金矿床的成矿作用可概括为富含成矿元素的深源流体在区域剪切构造作用下沿剪切系统不断向上运移,逐渐与浅部流体混合并与围岩发生交代蚀变作用,由于物理化学条件的改变,成矿元素最终在剪切扩容空间中富集成矿。     

Discovery and Genetic Mechanism of Basic Granulite in the Altay Orogenic Belt, Xinjiang, NW China

Altay granulite (AG), which represents the product of high-grade metamorphism in the lower crust, was newly found in the Wuqiagou area, Fuyun County in the Altay orogenic belt, Northwest China. It is composed mainly of hypersthene, augite, basic plagioclase, amphibole and brown biotite. Its mineral compositions of amphibole and biotite are rich in Mg/(Mg+Fe2+) and Ti. Geochemically, the AG is enriched in Mg/(Mg+Fe2+) and A12O3, and poor in CaO, with depletion of U, Th, K and Rb contents. Furthermore, geochemical data reflect that the protolith of the AG is igneous-genetic calc-alkaline basalt formed under an island arc environment. The AG has ZREE of 92.38-96.58 ppm and enriched LREE model with weak positive Eu anomaly of 1.09-1.15. In the MORB normalized spider diagram, the AG shows tri-doming pattern with a strong negative Nb anomaly and medium negative P and Ti anomalies, reflecting that the AG has tectonic relation with subduction or subduction-related materials. The P-T conditions of peak metamorphi     

东天山香山铜镍-钛铁成矿与两类岩浆演化关系探讨

香山矿床是东天山唯一一个铜镍矿体与钛铁矿体共存的复合型矿床,目前普遍被认为是同源岩浆高度演化的产物。但为何区内众多同时代镁铁-超镁铁质岩体中只有香山岩体产出有大型钛铁矿床?这一问题仍有待进一步探讨。本文通过系统对比香山与其相邻的黄山东、黄山和黄山南等典型铜镍矿的地球化学特征、母岩浆性质及岩浆演化过程,认为香山岩体母岩浆相对其相邻典型铜镍矿床并不富集Fe和Ti,且其母岩浆早期演化过程及分异演化程度相似。模拟计算表明:岩浆体系早期都处于较还原的环境(f_(O_2)QFM+1),而且都发生了大量橄榄石、斜方辉石和单斜辉石的分离结晶和硫化物的熔离,由此消耗了岩浆体系中大量的Fe,导致残余岩浆中Fe含量降低;另外在岩浆演化的各阶段,尤其到岩浆演化后期,大量角闪石的结晶进一步降低了残余岩浆中的Fe和Ti的含量,不能造成Fe和Ti的逐渐富集,据此我们认为同源岩浆演化不具备形成钛铁矿床的物质基础。通过初步对比东天山地区典型铜镍矿床和钛铁矿床与该地区早二叠世两类玄武岩的地球化学特征及演化趋势,我们初步推测东天山地区铜镍成矿与钛铁成矿是两类不同性质岩浆独立演化的产物,铜镍成矿可能与拉斑玄武质岩浆演化密切相关,而钛铁矿则可能与碱性玄武岩演化密切相关。     

天山和阿尔泰山冰碛物孔隙分析

本采用薄片法对新疆阿尔泰山哈纳斯河流域和天山乌鲁木齐河源区冰上融出碛、冰下融出碛和滞碛的孔隙特征进行了分析。冰上融出碛以不规则大孔隙为主，孔隙的孔径分布范围广，而受到静冰压力和冰川剪切的冰下融出碛和滞碛则以规则的圆孔隙和扁孔隙为主，视孔径主要集中于３－４ψ处。     

新疆东天山晚古生代地壳增生和成矿作用

地壳增生和成矿作用是矿床学研究的前沿领域;东天山作为中亚造山带的重要组成部分,在晚古生代地壳演化过程中经历了板块俯冲、碰撞造山大规模走滑剪切和后造山演化阶段,在每个构造演化阶段都伴随有地壳增生和大量有用金属元素的堆积。按照地壳增生和成矿作用关系,研究区晚古生代主要有如下几种矿床类型:1)晚泥盆世—早石炭世增生前形成的Cu-Mo-Au-Ag矿床;2)早石炭世增生前形成的Fe-Cu-Pb-Zn矿床;3)晚石炭世—早二叠世增生后形成的造山型Cu-Ni-PGE矿床;4)晚石炭世—早二叠世增生后形成的造山型Au-Cu矿床。上述矿床在形成过程中既有地壳的水平增生,也有地壳的垂向增生作用,已经构成了我国重要的内生金属矿床富集区。     

A Large-Scale Palaeozoic Dextral Ductile Strike-Slip Zone:the Aqqikkudug-Weiya Zone along the Northern Margin of the Central Tianshan Belt,Xinjiang,NW China

The nearly E-W-trending Aqqikkudug-Weiya zone, more than 1000 km long and about 30 km wide, is an important segment in the Central Asian tectonic framework. It is distributed along the northern margin of the Central Tianshan belt in Xinjiang, NW China and is composed of mylonitized Early Palaeozoic greywacke, volcanic rocks, ophiolitic blocks as a mélange complex, HP/LT-type bleuschist blocks and mylonitized Neoproterozoic schist, gneiss and orthogneiss. Nearly vertical mylonitic foliation and sub-horizontal stretching lineation define its strike-slip feature; various kinematic indicators, such as asymmetric folds, non-coaxial asymmetric macro- to micro-structures and C-axis fabrics of quartz grains of mylonites, suggest that it is a dextral strike-slip ductile shear zone oriented in a nearly E-W direction characterized by "flower" strusture with thrusting or extruding across the zone toward the two sides and upright folds with gently plunging hinges. The Aqqikkudug-Weiya zone experienced at least two stages of ductile shear tectonic evolution: Early Palaeozoic north vergent thrusting ductile shear and Late Carboniferous-Early Permian strike-slip deformation. The strike-slip ductile shear likely took place during Late Palaeozoic time, dated at 269(5 Ma by the40Ar/39Ar analysis on neo-muscovites. The strike-slip deformation was followed by the Hercynian violent S-type granitic magmatism. Geodynamical analysis suggests that the large-scale dextral strike-slip ductile shearing is likely the result of intracontinental adjustment deformation after the collision of the Siberian continental plate towards the northern margin of the Tarim continental plate during the Late Carboniferous. The Himalayan tectonism locally deformed the zone, marked by final uplift, brittle layer-slip and step-type thrust faults, transcurrent faults and E-W-elongated Mesozoic-Cenozoic basins.     

Geochronology,Geochemistry and Petrogenesis of Diabase Dyke Swarms in East Tianshan,Xinjiang, NW China

Diabase dyke swarms are widespread in the East Tianshan and Beishan regions. LA-ICP-MS zircon U-Pb ages of these diabase vary from 305 Ma to 278 Ma, showing that these dykes were formed during Late Carboniferous-Early Permian magmatism. All diabase samples are subalkali calc-alkali, characterized by slight LREE and LILEs enrichment, and weak negative Ti, Nb and Ta anomalies. The diabase samples have positive εNd(t) values (>+3), high Sr isotopic compositions (initial 87Sr/86Sr values=0.7030-0.7097), and large variation of Pb isotopic compositions, indicating they were derived from a deplete mantle source. Regional geology and geochemistry evidences indicate that these diabase dyke swarms were generated in a lithosphere extensional setting and had the same magma sources. Initial magmas may be a mixture of depleted asthenosphere mantle and enriched lithospheric mantle during rapid magma ascending.     

新疆阿尔泰库卫铜镍硫化物-钛铁氧化物复合型矿化镁铁-超镁铁质杂岩体成因

库卫镁铁-超镁铁质杂岩体位于新疆阿尔泰南缘,兼具铜镍矿化岩体和钒钛铁矿化岩体的双重特征,主要组成岩石类型有中粒辉长岩、条带状橄榄辉长岩、橄榄苏长辉长岩、角闪辉长岩和含橄辉长岩等。本文采用LA-ICP-MS锆石U-Pb定年法,获得中粒辉长岩、橄榄苏长辉长岩和含橄辉长岩的加权平均年龄分别为398.7±3.7Ma、397.5±2.3Ma和385.2±1.6Ma,表明库卫岩体是早中泥盆世构造-岩浆活动的产物。岩体的主量元素显示其属亚碱性系列,并具有向拉斑系列岩石演化的趋势。具有Ba、U、Ta、Pb、Sr、Ti和Eu的正异常,Th的负异常,显示了相似的LREE相对富集的右倾型配分模式,表明它们可能为同源岩浆演化的产物。结合地球化学特征和区域地质背景,推测库卫岩体为早中泥盆世俯冲消减环境的产物,其原始岩浆可能来源于受俯冲物质交代的地幔楔和软流圈的混合体,不同的岩石类型是相似来源的岩浆经强烈分异的结果。库卫岩体兼具铜镍矿化岩体和钒钛铁矿化岩体的双重特征,但形成铁钛矿床的潜力略显不足。     

新疆东部新元古代晚期和古生代构造格局及其演变

基于笔者近20年来对新疆东部地质构造的研究和对前人地质地球物理资料的深入分析，本文系统讨论了新疆东部新元古代晚期和古生代的地壳形成与演化。该区古生代的构造单元被划分为阿尔泰地块、额尔齐斯断裂带、东准噶尔古生代造山带、准噶尔地块、东天山造山带和库鲁克塔格地块。该区古生代地壳构造演化包括震旦纪-石炭纪洋陆格局的变迁、石炭纪末至二叠纪后碰撞壳幔相互作用等两个阶段。其洋陆格局的变迁包括古生代早期萨彦洋、早古生代阿尔曼太尔洋、晚古生代卡拉麦里洋、古生代北天山洋和南天山洋的打开与关闭，其中两个天山洋盆可能为一个洋盆，大体上可以对比为中亚地区的古亚洲洋北支斋桑洋，阿尔曼太洋和卡拉麦里洋可能为西伯利亚古陆的边缘洋盆；而古亚洲洋南支的乌拉尔一南天山洋向东是否延伸到新疆东部，还有待于进一步研究。新疆东部的后碰撞构造演化包括三期重大地质事件：①300Ma前后的以中酸性为主的大规模岩浆活动；②280Ma前后的包括幔源岩浆在内的双峰式岩浆活动；⑧二叠纪中晚期(可能延续到三叠纪)的大规模地壳走滑运动。在此基础上，对新疆东部新元古代晚期和古生代构造演化与古亚洲洋演变的关系进行了探讨，并对仍然存在的主要相关问题进行了总结和归纳。     

Alteration and Mineralization of the Shaquanzi Fe-Cu Deposit, Eastern Tianshan Orogenic Belt, NW China

Please?refer?to?the?attachment(s)?for?more?details.     

New Chronological Evidence for Indosinian Diagenetic Mineralization in Eastern Xinjiang, NW China

1 IntroductionMineralization in E. Xinjiang constitutes an importantpart of the Mid-Asian Metallogenetic Province. A greatdeal of nonferrous, ferrous, rare and noble metaldeposits of different genetic types and ages were formedduring different crustal evolution stages and werecontrolled by regional tectonic evolution. Large-scalemineralization of metallic deposits and relatedmagmatism mainly occurred during the Carboniferous toPermian periods (Li et al., 1998; Ji et al., 1999; Mao etal., 2…     

新疆阿尔泰大东沟铅锌矿床地质特征及稳定同位素地球化学研究

文章在对大东沟铅锌矿床地质特征进行简要描述的基础上,系统地研究了矿石碳、氢、氧、硫同位素的组成。研究结果表明其形成于火山活动的间歇期,受控于北西向断裂、火山沉积盆地、热液流体及喷流中心。矿体呈层状分布,与地层产状一致,直接容矿围岩为下泥盆统康布铁堡组火山－沉积岩,矿石构造以条带状、浸染状、细脉状为主,矿石矿物成分相对简单,主要为方铅矿、锌矿、黄铁矿等,其中锌的含量高于铅,矿床形成后经历了区域变质作用及热液流体改造。围岩蚀变较发育,矽卡岩化与铅锌矿化关系密切。矿床的34SV-PDB值为-22.3‰～11.7‰,方解石中的13CV-PDB值介于-4.2‰～0.4‰,计算所得的石英及方解石18O水值在-11.4‰～8.4‰之间,成矿流体应该为大气降水与岩浆水的混合物。矿床应属于火山－沉积岩容矿的块状硫化物矿床。     

Fluid Inclusion Characteristics of the Kalatage Meiling Cu-Au Deposit in Eastern Tianshan Mountains, NW China

Please refer to the attachment(s) for more details.     

新疆中天山古生代侵入岩浆序列及构造演化

新疆中天山构造岩浆带是中亚造山带的重要组成部分,广泛分布着古生代花岗质侵入体。本研究重点对中天山南缘巴音布鲁克及巴伦台地区的花岗质侵入体进行了LA-ICP-MS锆石U-Pb测年,并获得了岩体侵位年龄由老到新分别为463±3Ma(石英闪长岩)、437±5Ma(石英闪长岩)、424±3Ma(二长花岗岩)、383±4Ma(二长花岗岩)、356±3Ma(二长花岗岩)和303±5Ma(正长花岗岩)。综合区域地质分析认为,中天山古生代侵入岩浆活动可分为四个构造岩浆演化阶段:(1)晚寒武世—晚奥陶世阶段,Terskey洋盆和南天山洋盆自新元古代打开形成广阔洋盆,Terskey洋盆在晚寒武世开始初次俯冲,于晚奥陶世洋盆闭合,南天山洋盆于早奥陶世初次俯冲,具有自西向东、由早到晚的俯冲特点;(2)早志留世—中泥盆世阶段,南天山洋盆持续向北俯冲,该阶段北天山洋开始向南侧俯冲,在伊犁地块北缘形成了弧岩浆;(3)晚泥盆世—早石炭世阶段,南天山洋盆闭合于晚泥盆世末期,在早石炭世中晚期进入残余洋盆演化阶段;(4)晚石炭世—早二叠世阶段,该阶段为后碰撞伸展环境,区域上为陆内演化阶段。     

阿尔泰诺尔特地区晚古生代的沉积环境和古地理分析

诺尔特地区位于新疆阿尔泰东北部,地理位置属富蕴县.该地区主体构造为北东向,出露地层为前震旦系富蕴群、震旦系哈巴河群、泥盆系忙代恰组和石炭系红山嘴组,其中后两者占主导地位.泥盆系为一套类复理石建造,主要岩性有粉砂岩、细砂岩、钙质粉砂岩和少量火山岩;石炭系红山嘴组可以分为三个段,一段为粉砂岩、粉砂质泥岩、细砂岩与粉砂岩交替的韵律沉积岩、岩屑砂岩等,二段为粉砂质泥岩、粉砂岩、钙质粉砂岩和生物屑灰岩,三段火山物质大量出现,下部为火山碎屑和陆源碎屑的混合沉积,上部以凝灰岩为主,顶部出现火山角砾岩.根据岩性特征和沉积构造分析,泥盆系的沉积环境为浅海-半深海,以大陆斜坡为主;石炭系的沉积环境为浅海陆棚、滨岸和开阔台地,其中又包括一些小环境.通过沉积环境的分析,可以得出三种沉积相模式.     

东天山卡拉塔格西二区铁铜矿床地质地球化学特征及成因

西二区铁铜矿床是东天山卡拉塔格地区近年来新发现的矿床,但其矿床成因类型尚不明确.通过开展系统的电子探针、流体包裹体及H、O同位素研究,结果表明矿体赋存于大南湖组火山岩-火山碎屑岩中,受断裂控制,矿体呈似层状、透镜状.矿石结构主要为粒状结构和交代结构,矿石构造以块状构造和条带状构造为主.金属矿物主要为磁铁矿,脉石矿物主要为石榴子石、绿帘石、绿泥石、方解石等.成矿过程可划分为干矽卡岩、磁铁矿、石英-硫化物、碳酸盐这4个阶段.电子探针表明矿床早期形成钙铁榴石,磁铁矿阶段形成富铁矿石和富铁绿帘石.流体包裹体研究表明,从早到晚,成矿温度和盐度逐渐降低.H-O同位素表明成矿流体以岩浆水为主,演化至大气降水.由此可知西二区铁铜矿床属于矽卡岩型铁铜矿床.      

U-Pb Geochronology and Geochemistry of Stratiform Garnet from the Aqishan Pb-Zn Deposit, Eastern Tianshan, Xinjiang, NW China: Constraints on Genesis of the Deposit

The Aqishan lead-zinc deposit,located in the Jueluotag metallogenic belt of eastern Tianshan,Xinjiang,Northwest China,has a stratiform occurrence in the marine volcanic tuff of the Yamansu Formation.The ore body has a typical double-layer structure,having a stratified,stratoid,lenticular upper part and a veined,stockwork-like lower part.The occurrence of the upper orebody is consistent with that of the volcanic tuff wall rock.The ore minerals are mainly chalcopyrite,pyrite,sphalerite,galena and magnetite,the altered minerals mainly being silicified,such as sericite,chlorite,epidote,garnet.The garnetized skarn,being stratiform and stratoid,is closely related to the upper part of the orebody.Geological observations show that the limestone in the ore-bearing Yamansu Formation is not marbleized and skarnized.Spatially,it is associated with the ferromanganese deposits in the marine volcanic rocks of the Yamansu Formation.These geological features reflect the likelihood that the Aqishan lead-zinc deposit is a hydrothermal exhalation sedimentary deposit.The results from the EPMA show that the garnet is mainly composed of grossular-andradite series,contents being in a range of 34.791-37.8%SiO₂,32.493-34.274%CaO,8.454-27.275%FeO,0.012-15.293%Al₂O₃,0.351-1.413%MnO,and lower values of 0.013-1.057%TiO₂.The content of SiO₂ vs.CaO and FeO vs.Al₂O₃ has a significant positive correlation.The results of ICP-MS analysis for the garnet show that the REE pattern is oblique to right in general.The total amount of rare earth elements is relatively low,ΣREE=71.045-826.52 ppm,which is relatively enriched for LREE and depleted for HREE.LREE/HREE=8.66-4157.75,La_N/Yb_N=23.51-984.34,with obvious positive Eu and Ce anomalies(δEu=2.27-76.15,δCe=0.94-1.85).This result is similar to the REE characteristics of ore-bearing rhyolite volcanic rocks,showing that the garnet was formed in an oxidizing environment and affected by clear hydrothermal activity.The U-Pb isotopic dating of garnet by fs-LA-HR-ICP-MS gives an age of 316.3±4.4 Ma(MSWD=1.4),which is consistent with the formation time of the Yamansu Formation.According to the study of deposit characteristics and geochemical characteristics,this study concludes that the Aqishan lead-zinc deposit is a hydrothermal exhalation sedimentary deposit,the garnet being caused by hydrothermal exhalative sedimentation.     

新疆额敏东部志留纪化石的发现及其地质意义

在额敏东部原划为晚泥盆世塔尔巴哈台组的火山碎屑岩夹碳酸盐岩地层中发现了丰富的志留纪文洛克世动物化石, 包括珊瑚Halysites hoboksarensis、H. sp.、Mesofavosites sp., 腕足动物Atrypa sp.、Eospirifer radiatus, 三叶虫Encrinuroides sp.、Encrinurus sp.1、E. sp.2、Cheirurus sp.、Sthenarocalymene sp., 短剑类Lepidocoleus sp.和层孔虫等, 通过区域岩性组合对比, 将该套地层改划为文洛克统沙尔布尔组.珊瑚和层孔虫等对环境要求较高的生物化石的发现, 同时结合地层中风暴沉积的粒序层理、包卷层理及火焰构造等相标志, 说明了额敏东部在文洛克世为火山碎屑质的开阔台地相沉积环境, 处于热带、亚热带气候区.