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华北克拉通南北缘三叠纪钼矿化类型、特征及地球动力学背景 总被引：6，自引：1，他引：5
华北克拉通南北缘是中国最重要的钼成矿带,特别是近年来在南北缘陆续发现了大量的钼矿床,显示了巨大的钼资源前景。其中三叠纪钼矿床的不断发现引人注目。在华北克拉通北缘及邻区三叠纪钼矿床在空间上总体呈EW向展布,矿床产出受区域东西向断裂控制,钼矿床的形成与三叠纪酸性侵入体关系密切,多产于花岗岩体中、斑岩体内外接触带或附近,矿床类型包括斑岩型和石英脉型。在华北克拉通南缘及邻区,三叠纪钼矿床总体上呈NW向展布,受区域NW向断裂控制,钼矿床的形成与晚三叠世酸性侵入体及碳酸盐脉有关,矿床产于斑岩体内及附近,矿床类型包括斑岩型、石英脉型及碳酸盐脉型。成矿年代学研究表明,华北克拉通北缘及邻区三叠纪钼矿主要形成于248~220Ma,而南缘及邻区三叠纪钼矿床主要形成于226~210Ma。其对应的成矿动力学背景为印支期华北板块与西伯利亚板块同碰撞造山过程和扬子板块与华北板块同碰撞造山过程。 相似文献
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西拉沐伦成矿带中生代花岗岩浆活动与钼成矿作用 总被引：4，自引：0，他引：4
位于华北克拉通北缘的西拉沐伦成矿带内花岗岩浆活动及钼矿化发育,带内主要成矿侵入体岩石类型包括二长花岗岩、斑状花岗岩、花岗斑岩及流纹斑岩,这些岩石属于高钾钙碱性和钾玄岩系列,岩浆源区为古老下地壳和新生地壳。这些侵入体形成于早—中三叠世、晚侏罗世及早白垩世。带内钼矿床包括斑岩型、石英脉型、云英岩型和火山-次火山热液型4种类型,以斑岩型矿床最为发育。带内钼矿床形成时代与相关侵入岩时代一致,也形成于早—中三叠世、晚侏罗世及早白垩世,以早白垩世钼矿床最为发育。3期成岩成矿作用分别形成于华北板块与西伯利亚板块同碰撞至后碰撞构造环境、古太平洋板块向欧亚大陆俯冲的构造环境和中国东部岩石圈减薄构造环境。 相似文献
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华北地台北缘燕辽钼（铜）成矿带矿床地质特征及动力学背景 总被引：29，自引：10，他引：29
华北地台北缘是中国重要的多金属成矿带,中段部位钼(铜)矿床的分布受区域EW向、NE向、NNE向断裂的联合控制。成矿带东端辽西地区以钼矿为主,西端冀北地区以铜(钼)矿为主。钼矿床的形成与燕山期中酸性小侵入体关系密切,矿床多产于花岗斑岩体之中或内外接触带中,矿床类型以斑岩型、斑岩_矽卡岩型、矽卡岩型为主。同位素研究表明,钼(铜)矿床成矿物质及成矿流体主要来源于下地壳或与太古代结晶基底有关的花岗岩;钼矿的形成主要与中生代富硅、富钾质花岗岩有关,而与铜矿成因有关的花岗岩酸碱度相对较低。成矿年代学研究表明,燕辽钼(铜)成矿带大规模成矿作用发生于180Ma左右和140Ma左右2个时期,其对应的成矿动力学背景分别为华北板块与西伯利亚板块后碰撞造山阶段和中国东部构造体制大转折晚期。 相似文献
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西拉沐伦钼矿带半拉山斑岩钼矿床花岗斑岩锆石SHRIMP U-Pb测年及其地质意义 总被引：6，自引：0，他引：6
半拉山斑岩钼矿床是大兴安岭南段中生代西拉沐伦钼矿带中重要的钼矿床之一。矿床产于晚侏罗世火山岩中,矿区发育中生代侵入杂岩,侵入岩主要包括花岗闪长岩、闪长岩及花岗斑岩。矿床形成与侵入杂岩岩浆演化晚期岩浆活动有关。花岗斑岩锆石SHRIMP U-Pb定年表明,与成矿有关的晚期花岗斑岩侵位于(132.1±1.8) Ma。这表明,半拉山钼矿化发生在早白垩世,形成于中国东部岩石圈减薄构造环境。结合已有资料分析,认为大兴安岭南段除铅锌银铁铜等矿床之外,在白垩纪发生过重要的钼矿成矿作用,与白垩纪花岗斑岩有关的钼矿化是今后重要的找矿方向。 相似文献
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内蒙东部白土营子钼铜矿田的矿床地质特征、辉钼矿Re-Os年龄及其意义 总被引：5，自引：1，他引：4
白土营子斑岩型-石英脉型钼铜矿田是华北板块北缘西拉沐沦钼矿带南部新近发现的与岩浆热液活动密切相关的钼铜成矿系统.本文在矿床地质特征研究的基础上,对矿田内三个重要钼铜矿床开展了辉钼矿Re-Os同位素定年,初步获得:1)白土营子斑岩型钼铜矿床的成矿年龄为248.O±10Ma(MSWD=0.52,n=6);2)白马石沟石英脉型铜钼矿的成矿年龄为248.6±6.7Ma(MSWD=1.06,n=4);3)库里吐石英脉型钼铜矿的成矿年龄为245.0±4.3Ma(MSWD =0.71,n=5);这一结果揭示该矿集区的钼铜矿化发生在早三叠世.该成矿系统的形成适值早三叠世西伯利亚板块与华北板块碰撞造山过程的晚期,二长花岗斑岩的UST结构证明含矿流体来自岩浆作用.早三叠世钼铜成矿作用在华北板块北缘及邻区有一定的普遍性,找矿前景可观. 相似文献
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《铀矿地质》2021,(5)
红山子铀钼矿床位于华北陆块北缘的沽源-红山子铀多金属成矿带和西拉沐沦钼多金属成矿带上,该矿床内发现有发育在花岗斑岩内的辉钼矿化。通过对辉钼矿进行Re-Os同位素测定,获得模式年龄为(137.2±3.2) Ma和(138.2±2.1) Ma,对围岩花岗斑岩锆石进行SHRIMP U-Pb同位素测定,获得成岩年龄为(133.1±1.2) Ma。两种方法获得的年龄相近,表明成矿和成岩大致同时形成,均属早白垩世。另辉钼矿的Re含量为(186.6～216.8)×10~(-6),表明该钼矿化的成矿物质来自于地幔。通过与西拉沐沦钼多金属成矿带的典型矿床开展综合分析,认为红山子铀钼矿床的发育在花岗斑岩内的钼矿化具有斑岩型钼矿化特征,且应属该成矿带的138 Ma成矿期,该矿化是在白垩纪华北克拉通岩石圈减薄的大地构造背景下,由地幔组分与岩石圈作用形成的岩浆携带地幔含矿流体上侵而形成的钼矿化。 相似文献
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内蒙古鸡冠山钼矿流纹斑岩的成岩年龄及地质意义 总被引：1，自引：0，他引：1
内蒙古鸡冠山钼矿床是近年来发现的一个大型斑岩型钼矿床,位于华北克拉通北缘、西拉沐沦钼矿带的中段,产出于一破火山机构的NW侧。矿床矿石矿物辉钼矿Re-Os同位素等时线法测得成矿年龄为151.1±1.3Ma,为晚侏罗世成矿。本文通过SIMS锆石U-Pb年龄法,测定流纹斑岩成岩年龄为148.5±3.3Ma(U-Pb等时线年龄,2σ,MSWD=2.2),为晚侏罗世成岩。该成岩年龄与成矿年龄在误差范围内一致,说明与流纹斑岩有关的岩浆活动可能形成成矿的母岩浆,成岩与成矿近乎同时发生。 相似文献
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小狐狸山钼矿是内蒙古北山地区近年来新发现的一个中型规模的斑岩型矿床。通过对成矿斑岩锆石和成矿晚阶段石英脉型钼矿的同位素研究,获得小狐狸山含矿花岗岩锆石LA-ICP-MS U-Pb年龄216.9Ma±0.5Ma（MSWD=0.41）,与斑岩型钼矿化的时间220Ma±2.2Ma在误差范围内基本一致,为该矿床主要为一个斑岩型钼矿床提供了同位素年代学的佐证;晚成矿阶段辉钼矿单矿物Re-Os模式年龄加权平均值为213.2Ma±4.6Ma（MSWD=1.3）。小狐狸山钼矿床成矿岩体的展布受控于沿黑河展布的北东东向构造,该组构造切割了早期形成的北西向区域构造,暗示216~220Ma为北山地区由后碰撞进入板内伸展环境提供了初步的年龄约束,北山地区印支期的成矿作用值得重视。 相似文献
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内蒙古北山地区小狐狸山钼矿辉钼矿Re-Os年龄
和LA-ICP-MS锆石U-Pb年龄 总被引：2，自引：1，他引：1
小狐狸山钼矿是内蒙古北山地区近年来新发现的一个中型规模的斑岩型矿床。通过对成矿斑岩锆石和成矿晚阶段石英脉型钼矿的同位素研究,获得小狐狸山含矿花岗岩锆石LA-ICP-MS U-Pb年龄216.9Ma±0.5Ma（MSWD=0.41）,与斑岩型钼矿化的时间220Ma±2.2Ma在误差范围内基本一致,为该矿床主要为一个斑岩型钼矿床提供了同位素年代学的佐证;晚成矿阶段辉钼矿单矿物Re-Os模式年龄加权平均值为213.2Ma±4.6Ma(MSWD=1.3)。小狐狸山钼矿床成矿岩体的展布受控于沿黑河展布的北东东向构造,该组构造切割了早期形成的北西向区域构造,暗示216~220Ma为北山地区由后碰撞进入板内伸展环境提供了初步的年龄约束,北山地区印支期的成矿作用值得重视。 相似文献
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Geology and geochronology of the Xilamulun molybdenum metallogenic belt in eastern Inner Mongolia,China 总被引：1，自引：0，他引：1
Qingdong Zeng Jianming Liu Zuolun Zhang Weijun Chen Weiqing Zhang 《International Journal of Earth Sciences》2011,100(8):1791-1809
The Xilamulun molybdenum metallogenic belt, located in eastern Inner Mongolia, China, has great economic potential as a major
producer of molybdenum. Four major types of Mo deposits have been recognized in the Xilamulun molybdenum metallogenic belt:
porphyry, quartz vein, volcanic-hosted, and greisen. These Mesozoic Mo deposits are closely related to Si- and K-rich intrusives
and are usually hosted by granite plutons or located at the endo- or exo-contact zones of the granite porphyry. SHRIMP zircon
U–Pb dating gives the emplacement ages of the intrusions related to Mo mineralization as 245.1 ± 4.4, 152.4 ± 1.6, and 139.1 ± 2.3 Ma.
Re–Os analysis of five molybdenite samples from the Chehugou porphyry Mo deposit yields an isochron age of 245 ± 5 Ma (2σ),
indicating that the mineralization age of the porphyry Mo deposit is about 245 Ma. Re–Os analyses of six molybdenite samples
from the Nianzigou quartz-vein-type Mo deposit yield an isochron age of 154.3 ± 3.6 Ma (2σ), constraining the mineralization
age of the quartz-vein Mo deposit to 154 Ma. Our results suggest that the Mo mineralization in the Xilamulun belt formed during
at least three stages, i.e., the Triassic, Late Jurassic, and Early Cretaceous, and is coeval with the granitic magmatism.
The corresponding geodynamic background covers the syncollision between the North China and Siberian plates during the Early
to Middle Triassic, a compression setting related to the subduction of the Paleo-Pacific plate during the Jurassic and lithospheric
thinning during the Early Cretaceous in eastern China. 相似文献
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《International Geology Review》2012,54(1):55-75
The Laojiagou Mo deposit is a newly discovered porphyry Mo deposit located in the Xilamulun Mo metallogenic belt, Northeast China. Mo mineralization mainly occurred within the monzogranite and monzogranite porphyry. Re–Os isochron dating of molybdenites indicate a mineralization age of 234.9 ± 3.1 Ma. Zircon LA–ICP–MS U–Pb analysis for monzogranite porphyry and monzogranite yield 206Pb/238U ages of 238.6 ± 1.8 and 241.3 ± 1.5 Ma, respectively, indicating that Laojiagou Mo mineralization is related to Middle Triassic magmatism. Hf isotopic compositions of zircons from both monzogranite porphyry and monzogranite are characterized by positive εHf(t) values [εHf(t) = 2.9–7.3 and 1.5–7.9, respectively] and young TDM2 model ages, which implies that the magma was derived from juvenile crust created during accretion of the Central Asian Orogenic Belt (CAOB). Identification of the Laojiagou Mo deposit adds another important example of Triassic Mo mineralization in the Xilamulun Mo metallogenic belt where most Triassic Mo deposits in northeast China cluster around the northern margin of North China Craton. Based on the regional geological setting and geochronological and Hf isotope characteristics, we propose that Triassic Mo deposits and related magmatic rocks in northeast China formed during the last stages of evolution of the CAOB. These deposits formed during post-collisional extension after the closure of the Palaeo-Asian Ocean and amalgamation of the North China–Mongolian Block with the Siberian Craton. 相似文献
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内蒙古敖仑花斑岩钼矿床成岩成矿年代学及地质意义 总被引：19，自引：7，他引：12
敖仑花钼矿床位于大兴安岭南段,是西拉木伦河断裂北侧多金属矿集区内新发现的斑岩型钼矿床.首次采用SHRIMP锆石U-Pb技术对敖仑花含矿花岗斑岩进行了测年,获得成岩年龄为134±4Ma;采用ICP-MS方法测定敖仑花钼矿床辉钼矿中Re-Os同位素,获得模式年龄在131±2～133±2Ma之间,辉钼矿Re-Os同位素等时线年龄为132±1Ma(MSWD=1.12),成岩与成矿误差范围内基本同时发生,敖仑花斑岩钼矿床为早白垩世构造、岩浆活动的产物.西拉木伦河断裂带内的多金属矿床具有一定的时空分布规律,130～150Ma是带内矿床成矿高峰期,两侧矿床可能具有不同的成矿物质来源.区内独特的成矿特征,与区域经历了古亚洲洋构造域和滨西太平洋构造域的复合演化有关,发生于早白垩世时期的这一大规模成矿事件,是该区经历增生造山和地壳加厚之后,演化为孤后大陆伸展背景时强烈岩浆活动和成矿作用的产物. 相似文献
14.
《International Geology Review》2012,54(13):1660-1687
This study focuses on the geochronology and elemental and Nd isotopic geochemistry of the Baogutu Cu deposit and the newly discovered Suyunhe W-Mo deposit in the southern West Junggar ore belt (Xinjiang, China), as well as the geology of the newly discovered Hongyuan Mo deposit in the southern West Junggar ore belt and the Kounrad, Borly, and Aktogai Cu deposits and the East Kounrad, Zhanet, and Akshatau W-Mo deposits in the North Balkhash ore belt (Kazakhstan). The aim is to compare their petrogenesis, tectonic setting, and mineralization and to determine the relationship between the southern West Junggar and North Balkhash ore belts. Based on our newly acquired results, we propose that the Kounrad, Borly, Aktogai, and Baogutu deposits are typical porphyry Cu deposits associated with calc-alkaline magmas and formed in a Carboniferous (327–312 Ma) subduction-related setting. In contrast, the East Kounrad, Zhanet, Akshatau, Suyunhe, and Hongyuan deposits are quartz-vein greisen or greisen W-Mo or Mo deposits associated with alkaline magmas and formed in an early Permian (289–306 Ma) collision-related setting. Therefore, two geodynamic–metallogenic events can be distinguished in the southern West Junggar and North Balkhash ore belts: (1) Carboniferous subduction-related calc-alkaline magma – a porphyry Cu metallogenic event – and (2) early Permian collision-related alkaline magma – a greisen W-Mo metallogenic event. The North Balkhash ore belt is part of the Kazakhstan metallogenic zone, which can be extended eastward to the southern West Junggar in China. 相似文献
15.
The Xilamulun belt along the northern part of the North China Craton is located in eastern segment of the Central Asian Orogenic Belt and has great economic potential for Mo–Cu mineralization. More than ten medium to large ore deposits have been discovered in this region in the recent years. The major types of mineralization type include porphyry (Chehugou Mo–Cu, Kulitou Mo–Cu, Xiaodonggou Mo and Jiguanshan Mo), quartz vein (Nianzigou Mo, Xinjing Mo), epithermal (Hongshanzi Mo–U) and alteration assemblage (Liulingou Mo). The timing of mineralization was previously thought to be Yanshanian (208–290 Ma), however, Indosinian (260–208 Ma) ages for intrusions and mineralization have been recognized in recent years. Based on geochronologic data and regional geological evidence, it is suggested that the mineralization in the Xilamulun belt was formed during multiple events. The mineralization processes are related to a post-collisional extension stage (~ 258–210 Ma) with the generation of the porphyry molybdenum–copper deposit, a tectonic stress transformation from NS to EW (~ 185–150 Ma) that gave rise to vein or porphyry molybdenum deposit, and a lithospheric thinning stage (~ 140–110 Ma) with porphyry molybdenum deposit. 相似文献
16.
江西铜坑嶂钼矿和红山铜矿含矿斑岩锆石U-Pb定年及其地质意义 总被引：10，自引：2，他引：8
江西铜坑嶂钼矿和红山铜矿是在武夷山成矿带中最近发现的两个斑岩型矿床。本文利用LA-ICP-MS锆石U-Pb定年方法对铜坑嶂花岗斑岩和红山含矿花岗斑岩分别进行了年代学研究,获得铜坑嶂岩体中花岗斑岩的锆石年龄为138±1Ma,代表斑岩体侵位的年龄;红山矿区含矿斑岩的锆石年龄,分作两期,分别为99Ma和49Ma,两期不同的年龄可能代表了两期热事件。研究表明,铜坑嶂钼矿的成岩成矿时代均发生在白垩纪,其岩浆作用与成矿作用基本吻合。综合前人资料,认为铜坑嶂钼矿区的斑岩和红山铜矿区的斑岩可能分别形成于大陆弧后伸展带和岩石圈伸展环境。 相似文献