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《矿物岩石地球化学通报》2016,(6)
中国东南部晚中生代构造-岩浆活动强烈,花岗岩广泛分布。笔者近几年在赣南和闽西北鉴别出一系列早侏罗世镁铁质岩石和A型花岗岩,其中A型花岗岩呈北东向展布,构成一条早侏罗世A型花岗岩带。结合前人研究成果发现,中国东南部还存在另外3条A型花岗岩带,分别为晚侏罗世、早白垩世和晚白垩世A型花岗岩带,它们与早侏罗世A型花岗岩带一样均呈北东向展布,平行于现今海岸线,其中晚侏罗世A型花岗岩带更靠内陆一侧,早白垩世A型花岗岩带几乎与早侏罗世A型花岗岩带重叠,晚白垩世A型花岗岩带则分布于沿海地区。通过镁铁质和花岗质岩石成因综合研究,认为中国东南部晚中生代构造-岩浆活动可用古太平洋板块反复俯冲-后退模式来解释。 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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福安赤路钼矿产于燕山晚期第四次侵入似斑状中细粒花岗岩及晚侏罗世赤水组上段流纹质晶屑凝灰熔岩接触带上,内带矿体呈似层状、透镜状,外带矿体呈脉状。区内花岗岩是在早白垩世中酸性-酸性系列岩浆喷发之后,在燕山晚期第四次入侵,经长期分异演化的超酸性花岗岩;钼矿的成矿时间在花岗岩形成之后,正长斑岩形成之前。综合分析矿床成矿地质背景和地质特征,认为该矿床为岩浆期后中高温热液型。 相似文献
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我国东北古生代—中生代洋陆构造演化存在较大争议。黑龙江省中东部地区二叠纪—早侏罗世岩浆活动强烈、矿床发育,为我们认识中国东北晚古生代至早中生代洋陆转换过程以及成矿地质背景提供了重要素材。本文在系统总结黑龙江省中东部的蛇绿岩、岛弧岩浆岩和矿床学研究成果基础上,分析并识别出洋内弧前弧玄武岩、富铌玄武（安山）岩和英云闪长岩—奥长花岗岩—花岗闪长岩（TTG）等岩石类型,并将研究区二叠纪—早侏罗世洋陆演化与成矿划分为二叠纪、早—中三叠世、晚三叠—早侏罗世三个阶段。（1）早二叠世佳木斯地块东侧的前弧玄武岩、富铌玄武岩和TTG岩类记录了古太平洋初始俯冲和洋陆俯冲,由于该西向俯冲导致佳木斯地块和松嫩地块间弧后拉张形成牡丹江洋,这期间佳木斯地块上的金矿围岩花岗岩类为与古太平洋俯冲背景有关的I型花岗岩。（2）早—中三叠世牡丹江洋发生双向俯冲消减,其中与牡丹江洋西向俯冲板片后撤相关的成矿序列为斑岩型钼矿。（3）晚三叠—早侏罗世佳木斯地块东缘受到古太平洋持续俯冲,以及晚三叠世末期—早侏罗世早期牡丹江洋闭合,形成松嫩地块和佳木斯地块同碰撞、碰撞后伸展以及古太平洋俯冲相关的岩浆事件,该时期主要形成早侏罗世斑岩型钼矿床和矽卡岩型多金属矿床。 相似文献
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江西武功山穹隆复式花岗岩的锆石U-Pb年代学研究 总被引：21，自引：4，他引：17
采用锆石U-Pb法对武功山穹隆复式花岗岩中广泛分布的花岗质岩石开展精细定年研究,结果表明:山庄、张佳坊和武功山岩体的锆石U-Pb年龄分别为460.5±1.5 Ma、427.9±1.2 Ma和428.0±1.0-462.3±2.3 Ma,属早古生代晚期花岗岩;而雅山、温汤和明月山等岩体的锆石U-Pb年龄分别为161.0±1.0 Ma、143.8±1.6 Ma和126.3±6.4.Ma,属晚侏罗世-早白垩世花岗岩。因此认为武功山穹隆复式花岗岩中花岗岩分属早古生代晚期及晚侏罗世-早白垩世岩浆活动产物。从一个侧面说明华南地区大地构造演化过程中可能存在早古生代晚期构造一岩浆作用事件及晚侏罗世-早白垩世构造-岩浆作用事件,为华南大地构造演化研究提供了新的依据。结合前人在武功山地区花岗质片麻岩中白云母40Ar/39Ar法定年(225-233 Ma)资料,说明本区韧性变形形成于晚i叠世,可能意味着武功山伸展构造的启动时间,而晚侏罗世-早白垩世花岗岩浆的形成及向上运移,使周围的岩石软化乃至部分熔融,使得围岩环境更有利于伸展构造发展,并在早白垩世最终形成武功山花岗岩穹隆伸展构造。 相似文献
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姜平 《吉林大学学报(地球科学版)》2004,(Z1)
漳浦复式岩体是一个主要由辉石闪长岩、石英(二长)闪长岩、花岗闪长岩、二长花岗岩、正长花岗岩及晶洞碱长花岗岩组成的大型中生代复式岩体。通过详细的室内外调查研究,根据侵入体之间及其与围岩的接触关系、岩石的矿物成分及岩石化学、结构构造、地球化学等特征,以成分演化单元为基本单位,漳浦复式岩体可划分出早侏罗世—晚白垩世共16个基本单元,归并为古美山、漳浦、漳洲3个超单元及4个独立单元。R1R2图解及巴尔巴林岩浆构造分类,漳浦复式岩体中各超单元(单元)侵入岩分别形成于不同的构造环境。据岩浆演化及其与区域构造演化的关系,该复式岩体是早侏罗世、晚侏罗世、晚侏罗世晚期—早白垩世、早白垩世及晚白垩世等5个构造—岩浆活动旋回岩浆活动的产物。 相似文献
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安徽青阳百丈岩钨钼矿床成矿背景与成矿模式 总被引：5，自引：0，他引：5
本文在总结前人研究成果的基础上,分析了安徽青阳百丈岩钨钼矿床的成矿地质背景、控矿地质条件、成岩成矿时代和矿床成因,建立了矿床成矿模式,并进一步探讨了矿床的成矿地球动力学背景.百丈岩钨钼矿床的成岩物质以壳源为主,成矿是燕山晚期的陆壳重熔型花岗岩侵入的结果,燕山期两次大规模的岩浆活动是成矿的关键因素,对应晚侏罗世花岗闪长岩、早白垩世二长花岗岩及碱性花岗岩,分别形成于陆内挤压加厚和拆沉减薄两种构造背景.百丈岩钨钼矿形成于早白垩世拆沉减薄环境,表明在东部燕山期构造环境发生转变.百丈岩钨钼矿在晚侏罗世挤压加厚转换为早白垩世拆沉减薄的背景中成矿,与东部燕山期成矿大爆发吻合. 相似文献
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闽南沿海地区变质变形侵入岩时序划分及其地质意义 总被引：4，自引：0，他引：4
根据接触关系,结合同位素测年资料、岩石变形变质特征及原岩的岩石学、矿物学等特征,将闽南沿海地区变质变形侵入岩划分为早侏罗世东山序列(石英闪长岩—花岗闪长岩—二长花岗岩—正长花岗岩)、晚侏罗世古美山序列(花岗闪长岩—二长花岗岩—正长花岗岩)(145.4 Ma,LA-ICPMS锆石U-Pb)及早白垩世早期漳浦序列(石英闪长岩—花岗闪长岩—二长花岗岩—正长花岗岩)(121.5～139.4 Ma,锆石U-Pb)。并据侵入岩产状、岩石学、矿物学、岩石化学及地球化学等特征,分析各序列花岗岩的成因及形成时的构造环境,认为早侏罗世东山序列岩浆来源为壳-幔混合源(I型),形成于构造体制由挤压转向拉张转换期大陆上隆(碰撞后隆升)的构造环境(PAG);晚侏罗世古美山序列岩浆来源为幔-壳混合源(I-S型),属与板块碰撞(俯冲作用)有关的同碰撞花岗岩(ACG);早白垩世早期漳浦序列岩浆来源为壳-幔混合源(I-S型),属构造体制由挤压向拉张转化时期幔-壳源型花岗岩(KCG)。该区变质变形花岗岩序次的厘定及其成因、形成环境的研究为长乐—南澳断裂带中生代构造演化提供了依据,并为东南沿海地区寻找与中生代岩浆作用有关的钨、锡、铜、钼等矿产提供找矿理论依据。 相似文献
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福建漳平北坑场钼多金属矿床辉钼矿Re-Os同位素年龄及其地质意义 总被引：7，自引：0，他引：7
福建漳平钼多金属矿床位于闽西南晚古生代坳陷东缘。中生代以来,闽西南坳陷经历了强烈的构造岩浆作用的改造,并伴随多期次成矿作用的发生。已有同位素年代学研究成果表明该区存在早侏罗世、中侏罗世以及早白垩世成矿作用,但缺少与晚侏罗世大规模岩浆作用相关的成矿年代学记录。本文选取漳平北坑场钼多金属矿床开展辉钼矿的Re-Os同位素年代学研究。根据Re-Os同位素测年结果,结合矿床围岩蚀变及矿化特征以及与岩体的相互关系,指出钼矿化的形成经历了多个成矿阶段,其中小规模的矿化发生在148.8±2.2Ma。主矿化阶段形成的矿床以细脉或网脉状赋存于下二叠统翠屏山组石英细砂岩中,其等时线年龄为139.8±2.3～143.7±2.1Ma,为晚侏罗世—早白垩世成矿。成矿物质主要来源于特提斯向环太平洋构造域转换后闽西南地区晚侏罗世—早白垩世壳源花岗岩浆。 相似文献
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墨西哥中新生代岩浆作用与太平洋板块向东俯冲消减作用及晚白垩-始新世的拉腊米期造山运动有关,岩浆作用控制了矿床的分布规律。文章通过综合分析大量墨西哥中新生代岩浆岩和矿床资料,讨论了岩浆活动规律及构造活动和成矿作用的关系。墨西哥主要有5个岩浆活动时期,分别为晚古生代岩浆作用、早-中侏罗世岩浆作用、白垩世岩浆作用、古近纪岩浆作用、中新世岩浆作用。墨西哥的成矿作用主要与拉腊米期岩浆活动有关(约80 Ma—40 Ma),中新生代的矿床明显分成晚侏罗世(J3)、早白垩世(K1)、晚白垩世(K2)、古新世(E1)、始新世(E2)、渐新世(E3)、中新世(N1)等地质时期。古太平洋板块、法拉隆板块和科科斯板块等三大板块俯冲消减形成3个俯冲成矿系列,即从沿海到内陆依次发育有IOCG型铁铜金成矿带→斑岩型铜钼金成矿带→浅成低温热液型银金多金属成矿带,分别代表太平洋古板块、法拉隆板块和科科斯板块向北美板块从俯冲挤压到碰撞后伸展的岩浆成矿环境。 相似文献
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闽西南地区大地构造演化和矿床时空分布规律 总被引：5，自引：1，他引：4
在充分吸收前人工作成果的基础上,讨论了闽西南地区的主要矿床类型及其特征,将闽西南地区的矿床划分为三个矿床成矿系列:晋宁期与海相火山作用有关的铅、锌、银多金属块状硫化物矿床成矿系列;海西-印支期与火成岩有关的铁、铜、铅、锌多金属矿床成矿系列;燕山期与中酸性火成岩有关的铁、铜、铅、锌、钼、钨、锡、金、银、铀等多金属矿床成矿系列。其中,与燕山期有关的矿床成矿系列可进一步划分为侏罗纪早期与壳幔混合源I型花岗闪长岩有关的铁、铜、铅、锌矿床成矿亚系列;侏罗纪晚期与壳源S型花岗质岩体有关的钨、锡、钼、铋多金属矿床成矿亚系列;早白垩世与壳源型中酸性侵入岩有关的层控矽卡岩型铁、铜、铅、锌、钼多金属矿床成矿亚系列;早白垩世与壳幔混合源型中酸性侵入岩-次火山作用有关的金、银、铜、钼、铅、锌、铀等多金属矿床成矿亚系列。总结研究提出了各成矿(亚)系列的形成背景、时空分布规律,初步认为晋宁期VMS型多金属矿床形成于华南联合陆块拉张裂解形成的政和-大埔海底双峰式火山盆地环境,海西-印支期岩浆热液-斑岩型金属矿床形成于陆内伸展与挤压环境交替出现的岩浆侵入过程中,而燕山期成矿(亚)系列则形成于太平洋构造域时期的陆内伸展与挤压环境交替出现的岩浆侵入与火山喷发的过程中。 相似文献
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J.W. Mao F. Pirajno J.F. Xiang J.J. Gao H.S. Ye Y.F. Li B.J. Guo 《Ore Geology Reviews》2011,43(1):264-293
The East Qinling–Dabie orogenic belt accommodates the largest Mo ore district in the world. It contains 8.43 Mt of proven Mo metal reserves which accounts for 66% of the total proven Chinese Mo reserves. The Mo ore district includes 24 deposits and 12 occurrences, with four major types of Mo mineral systems, i.e., porphyry, porphyry-skarn, skarn and hydrothermal veins. The latter can be further subdivided into quartz vein and carbonatite vein types. Although Mo mineralization in the belt began in the Paleoproterozoic (1680 ± 24 to 2044 ± 14 Ma), all economically significant deposits were formed during the Mesozoic. Re/Os dating of molybdenite has shown that there are three episodes of Mo mineralization, i.e., Late Triassic (233–221 Ma), Late Jurassic to Early Cretaceous (148–138 Ma) and Early to middle Cretaceous (131–112 Ma).Late Triassic Mo deposits developed as molybdenite–quartz veins and carbonatite vein types. Stable isotope systematics (C, O, S) and high contents of Re and Sr indicate that the carbonatite Mo veins are mantle-derived. Porphyry and porphyry–skarn Mo mineral deposits were formed in the Late Jurassic to Early Cretaceous and Early to middle Cretaceous. The Late Jurassic to Early Cretaceous granite porphyries that are associated with the Mo deposits usually occupy less than 1.5 km2 at the surface and are situated in the East Qinling area, far west of China's continental margin. On the other hand, the Early to middle Cretaceous batholiths and granite porphyries, , with associated Mo deposits are located in the Dabieshan area and eastern part of the East Qinling area. The Late Jurassic to Early Creataceous granitoids and related Mo deposits possibly formed in a back-arc extensional setting of the Eurasian continental margin, which was probably triggered by the oblique subduction of the Izanagi plate. The Early to middle Cretaceous batholiths and granite porphyries are linked to the tectonic regime of lithospheric thinning, asthenospheric upwelling and partial melting of the crust, induced by a change in Izanagi Plate motion parallel to the continent margin.In the East Qinling–Dabie belt there are vein type Pb–Zn–Ag deposits surrounding porphyry and/or porphyry–skarn Mo (W) deposits, forming well defined ore clusters. The same spatial arrangement (i.e., porphyry Mo stockworks and outlying Pb–Zn–Ag ore veins) is also observed at the deposit scale. Thus, Mo porphyry stockworks and distal polymetallic veins belong to the same ore system and may reflect an outward temperature decrease from the highly fractionated granite plutons. Both, porphyry stockworks and polymetallic veins, can be used as vectors for further prospecting. 相似文献
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Analysis of the spatial relations of gold ore occurrences and the enclosing geological environment in the Chukotka Autonomous Okrug (ChAO) has shown that Au–quartz ore occurrences in turbidites are located predominantly in areas of the Early Cretaceous granitoid magmatism with the thick collision-type continental crust. The Cu–Au porphyry deposits are located in areas with complete development of Early Cretaceous magmatism within the outer zone of the Okhotsk–Chukchi volcanoplutonic belt (OChVB). The Au–Ag epithermal deposits are located in the areas of the Late Cretaceous granitoid magmatism within the inner and outer zones of the OChVB. The prospects of island-arc complexes for searching for Kuroku-type Au-bearing ore objects are available. 相似文献
15.
The Xiaoxinancha Au–Cu deposit is located at the eastern segment of the Tianshan–Xingmeng orogenic belt in northeast China. The deposit includes porphyry Au–Cu orebodies, veined Au–Cu orebodies and veined Mo mineralizations. All of them occur within the diorite intrusion. The Late Permian diorite, Late Triassic granodiorite, Early Cretaceous granite and granite porphyry are developed in the ore area. The studies on geological features show that the porphyry Au–Cu mineralization is related to the Late Permian diorite intrusion. New geochronologic data for the Xiaoxinancha porphyry Au–Cu deposit yield Permian crystallization zircon U–Pb age of 257 ± 3 Ma for the diorite that hosts the Au–Cu mineralization. Six molybdenite samples from quartz + molybdenite veins imposed on the porphyry Au–Cu orebodies yield an isochron age of 110.3 ± 1.5 Ma. The ages of the molybdenites coeval to zircon ages of the granite within the errors suggest that the Mo mineralization was genetically related to the Early Cretaceous granite intrusion. The formation of the diorite and the related Au–Cu mineralization were caused by the partial melting of the subduction slab during the Late Palaeozoic palaeo‐Asia Ocean tectonic stage. The Re contents and Re–Os isotopic data indicate that the crustal resource is dominated for the Mo mineralization during the Cretaceous extensional setting caused by the roll‐back of the palaeo‐Pacific plate. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
16.
南秦岭山阳-柞水矿集区构造-岩浆-成矿作用 总被引：9，自引：2，他引：7
山阳-柞水矿集区是南秦岭成矿带主要矿集区之一。从新元古代到晚侏罗世-早白垩世,山阳-柞水地区经历了洋壳俯冲和陆陆碰撞的构造演化,在演化的不同阶段形成了不同矿化类型、矿化组合的Cu、PbZn、Ag、Fe、Mo、Au矿床。新元古代时期,由于洋壳的俯冲作用,山阳-柞水地区形成了与基性岩有关的钛磁铁矿;泥盆纪-二叠纪时期,古秦岭洋消减形成山阳-柞水弧前盆地的同时,也形成一系列沉积型Fe、Ag、PbZn矿床;三叠纪时期,华北、扬子板块全面碰撞并形成了与碰撞作用密切相关的晚三叠世斑岩型Mo矿和造山型Au矿;晚侏罗世-早白垩世时期,则形成了碰撞后伸展环境下的矽卡岩-斑岩型CuMo-Au矿床。山阳-柞水矿集区内的各种时代和类型的矿床是秦岭造山带不同阶段的构造-岩浆活动的产物,对真实、客观的理解秦岭地区的构造演化具有重要意义。 相似文献
17.
Multiple Mesozoic mineralization events in South China—an introduction to the thematic issue 总被引：46，自引：0，他引：46
Mesozoic mineral deposits in South China include world-class deposits of W, Sn and Sb and those that provide the major sources of Ta, Cu, Hg, As, Tl, Pb, Zn, Au and Ag for the entire country. These deposits can be classified into polymetallic hydrothermal systems closely related to felsic intrusive rocks (Sn–W –Mo granites, Cu porphyries, polymetallic and Fe skarns, and polymetallic vein deposits) and low-temperature hydrothermal systems with no direct connection to igneous activities (MVT deposits, epithermal Au and Sb deposits). Recent studies have shown that they formed in the Triassic (Indosinian), Jurassic–Cretaceous (Early Yanshanian), and Cretaceous (Late Yanshanian) stages. Indosinian deposits include major MVT (Pb–Zn–Ag) deposits and granite-related W–Sn deposits. Early Yanshanian deposits are low-temperature Sb–Au and high-temperature W–Sn and Cu porphyry types. Many Late Yanshanian deposits are low-temperature Au–As–Sb–Hg and U deposits, and also include high-temperature W–Sn polymetallic deposits. The formation of these deposits is linked with a specific tectonothermal evolution and igneous activities. This special issue brings together some of the latest information in eight papers that deal with the origins and tectonic environments of mineral deposits formed in these stages. We anticipate that this issue will stimulate more interests in these ore deposits in South China. 相似文献
18.
Duobaoshan is the largest porphyry-related Cu-Mo-Au orefield in northeastern(NE)Asia,and hosts a number of large-medium porphyry Cu(PCDs),epithermal Au and Fe-Cu skarn deposits.Formation ages of these deposits,from the oldest(Ordovician)to youngest(Jurassic),have spanned across over 300 Ma.No similar orefields of such size and geological complexity are found in NE Asia,which reflects its metallogenic uniqueness in forming and preserving porphyry-related deposits.In this study,we explore the actual number and timing of magmatic/mineralization phases,their respective magma genesis,fertility,and regional tectonic connection,together with the preservation of PCDs.We present new data on the magmatic/mineralization ages(LA-ICP-MS zircon U-Pb,pyrite and molybdenite Re-Os dating),whole-rock geochemistry,and zircon trace element compositions on four representative deposits in the Duobaoshan orefield,i.e.,Duobaoshan PCD,Tongshan PCD,Sankuanggou Fe-Cu skarn,and Zhengguang epithermal Au deposits,and compiled published ones from these and other mineral occurrences in the orefield.In terms of geochronology,we have newly summarized seven magmatic phases in the orefield:(1)Middle-Late Cambrian(506-491 Ma),(2)Early and Middle Ordovician(485-471 Ma and~462 Ma),(3)Late Ordovician(450-447 Ma),(4)Early Carboniferous and Late-Carboniferous to Early Permian(351-345 and 323-291 Ma),(5)Middle-Late Triassic(244-223 Ma),(6)Early-Middle and Late Jurassic(178-168 Ma and~150 Ma),and(7)Early Cretaceous(~112 Ma).Three of these seven major magmatic phases were coeval with ore formation,including(1)Early Ordovician(485-473 Ma)porphyry-type Cu-Mo-(Au),(2)Early-Middle Triassic(246-229 Ma)porphyry-related epithermal Au-(Cu-Mo),and(3)Early Jurassic(177-173 Ma)Fe-Cu skarn mineralization.Some deposits in the orefield,notably Tongshan and Zhengguang,were likely formed by more than one mineralization events.In terms of geochemistry,ore-causative granitoids in the orefield exhibit adakite-like or adakite-normal arc transitional signatures,but those forming the porphyry-/epithermal-type Cu-Mo-Au mineralization are largely confined to the former.The varying but high Sr/Y,Sm/Yb and La/Yb ratios suggest that the ore-forming magmas were mainly crustal sourced and formed at different depths(clinopyroxene-/amphibole-/garnet-stability fields).The adakite-like suites may have formed by partial melting of the thickened lower crust at 35-40 km(for the Early Ordovician arc)and>40 km(for the Middle-Late Triassic arc)depths.The Early Jurassic Fe-Cu skarn orecausative granitoids show an adakitic-normal arc transitional geochemical affinity.These granitoids were likely formed by partial melting of the juvenile lower crust(35-40 km depth),and subsequently modified by assimilation and fractional crystallization(AFC)processes.In light of the geological,geochronological and geochemical information,we proposed the following tectonometallogenic model for the Duobaoshan orefield.The Ordovician Duobaoshan may have been in a continental arc setting during the subduction of the Paleo-Asian Ocean,and formed the porphyry-related deposits at Duobaoshan,Tongshan and Zhengguang.Subduction may have ceased in the latest Ordovician,and the regional tectonics passed into long subsidence and extension till the latest Carboniferous.This extensional tectonic regime and the Silurian terrestrial-shallow marine sedimentation had likely buried and preserved the Ordovician Duobaoshan magmatic-hydrothermal system.The south-dipping Mongol-Okhotsk Ocean subduction from north of the orefield had generated the Middle-Late Triassic continental arc magmatism and the associated Tongshan PCD and Zhengguang epithermal Au mineralization(which superimposed on the Ordovician PCD system).The Middle Jurassic closure of Mongol-Okhotsk Ocean in the northwestern Amuria block(Erguna terrane),and the accompanying Siberia-Amuria collision,may have placed the Paleo-Pacific subduction system in NE China(including the orefield)under compression,and formed the granodiorite-tonalite and Fe-Cu skarn deposits at Sankuanggou and Xiaoduobaoshan.From the Middle Jurassic,the consecutive accretion of Paleo-Pacific arc terranes(e.g.,Sikhote-Alin and Nadanhada)onto the NE Asian continental margin may have gradually distant the Duobaoshan orefield from the subduction front,and consequently arc-type magmatism and the related mineralization faded.The minor Late Jurassic and Cretaceous unmineralized magmatism in the orefield may have triggered mainly by the far-field extension led by the post-collisional(Siberia-Amuria)gravitational collapse and/or Paleo-Pacific backarc-basin opening. 相似文献
19.
大兴安岭北部主要金属矿床成矿系列和区域矿床成矿谱系 总被引：10，自引：4，他引：6
文章以大兴安岭北部内生金属矿床、海相火山岩型硫铁矿矿床和砂金矿床为研究对象,按照矿床成矿系列的学术思想将其划分为7个矿床成矿系列,即:多宝山地区与加里东期中酸性火山_侵入活动有关的铜、钼矿床成矿系列,呼玛地区与华力西期辉长岩和花岗岩有关的铁、钛、金矿床成矿系列,伊尔施_黑河地区与华力西期花岗岩和海相火山岩有关的铁、铜、锌、硫铁矿矿床成矿系列,牙克石地区与华力西期海相中基性火山岩有关的铁、锌、硫铁矿矿床成矿系列,得尔布干地区与印支期_燕山期中酸性火山_侵入活动有关的铅、锌、银、铜、钼、金矿床成矿系列,伊尔施_呼玛地区与燕山期中酸性火山_侵入活动有关的金、铁、锌、铜、钼、钨矿床成矿系列和黑龙江流域与第四纪冲积沉积作用有关的砂金矿床成矿系列。大兴安岭北部区域矿床成矿谱系表明,从奥陶纪到新生代该区不同构造单元经历了7个主要的构造演化及成矿时期,依次出现奥陶纪岛弧环境的斑岩型矿床、泥盆纪陆块边缘拉张环境的岩浆型和热液脉型矿床、泥盆纪—石炭纪俯冲_碰撞环境的海相火山岩型和矽卡岩型矿床、石炭纪弧后盆地环境的海相火山岩型矿床、晚三叠世—早白垩世俯冲_碰撞_后碰撞环境的斑岩型、热液脉型、浅成低温热液型和矽卡岩型矿床、早侏罗世—早白垩世俯冲环境的斑岩型、热液脉型、浅成低温热液型和矽卡岩型矿床和新生代地壳差异运动带砂金矿床。大兴安岭北部优势矿种为铜、钼、金、银、铅、锌,主攻矿床类型为斑岩型、热液脉型、低硫化浅成低温热液型、冲积型和海相火山岩型。 相似文献