本文主要研究内容
作者张明玉（2019）在《内蒙古集宁南部地区钼矿成矿作用》一文中研究指出：华北克拉通北缘钼矿带是仅次于东秦岭钼矿带和小兴安岭-张广才岭钼矿带的中国第三大钼矿带。该矿带的钼矿床主要产出于河北省和北京的北部燕山地区及辽宁省西部,传统上被称为燕辽钼矿带。近年来,卓资县大苏计大型斑岩钼矿床、兴和县曹四夭超大型斑岩钼矿床以及丰镇市泉子沟大型斑岩钼矿床的发现,使燕辽成矿带最西端的内蒙古集宁南部地区成为华北克拉通北缘的另一个大型钼矿集区。目前,集宁南部地区钼矿床的成矿物质来源、元素迁移、富集及沉淀机制及其与中生代岩浆活动的关系仍然不清,严重影响了对华北克拉通北缘钼成矿作用的理解和下一步找矿工作的开展,因此,急需开展系统的研究。本文以集宁南部地区2个斑岩型钼矿床（曹四夭矿床和泉子沟矿床）为研究对象,在详细研究矿床地质特征基础上,采用副矿物、硫化物及单个熔融包裹体LA-ICP-MS微量元素分析,绢云母Ar-Ar、硫化物Rb-Sr、锆石U-Pb、辉钼矿Re-Os等定年,锆石Lu-Hf、钾长石Pb-O、石英H-O、硫化物S-Pb等同位素示踪,以及岩石地化和流体包裹体测温及成分分析等方法,深入解剖曹四夭和泉子沟2个矿床,进而探讨集宁南部地区钼矿床的成岩成矿作用过程。曹四夭矿床的钼资源量达1.75 Mt,矿体主要产于曹四夭杂岩体与地层的外接触带,辉钼矿主要以细脉和网脉形式赋存在集宁（岩）群黄土窑组浅粒岩、变粒岩、新元古代辉绿岩及燕山期花岗质斑岩中。矿区正长花岗斑岩中的绢云母40Ar/39Ar等时线年龄和外围脉状铅锌金（银）矿体中硫化物的Rb-Sr等时线年龄分别为146.4±2.2 Ma和145.3±1.0 Ma,暗示二者属于同一斑岩成矿系统。硫化物LA-ICP-MS微量元素含量的变化,暗示了曹四夭矿床由成矿早阶段至晚阶段,成矿流体由与岩浆活动有关的高温热液,向低温热液演变的过程。熔融包裹体LA-ICP-MS微量元素组成表明,曹四夭矿床与成矿密切相关的正长花岗斑岩初始花岗质岩浆为富含Mg、Mn、Fe、Ti等元素的硅酸盐质岩浆,通过结晶分异使岩浆中的挥发分（H2O、CO2、CH4、S、Cl等）过饱和。当富含挥发分的中酸性岩浆从深部岩浆房向上运移时发生出溶,因温度、压力的降低相变为岩浆气液,从而造成流体相和熔体相的不混溶,使挥发分中富集的成矿元素（Mo、Fe、Cu等）在有利部位结晶成矿,而熔体相则逐渐演变成一种贫Mg、Mn、Fe、Ti,而相对富H2O和CO2的残余熔融体,最终演变为几乎只有SiO2和H2O以及少量碱金属的流体。后期侵位的二长花岗斑岩未见明显矿化,可能与其原始岩浆中缺乏S、Cl等挥发分有关。泉子沟大型斑岩钼矿床（约0.12 Mt Mo）矿区出露一套燕山期花岗质杂岩体——红娘山杂岩体,主要由中粗粒花岗岩、似斑状花岗岩和石英斑岩组成,钼矿体主要赋存于似斑状花岗岩中。辉钼矿Re-Os和锆石U-Pb定年结果表明,泉子沟钼矿床形成于晚侏罗世早期（162Ma）,成矿与似斑状花岗岩关系密切。矿区红娘山杂岩体岩石均富硅和碱,贫MgO、CaO、FeO和Fe2O3,岩石类型为正长花岗岩和碱性花岗岩,属高钾钙碱性系列的I型花岗岩,形成于后造山伸展环境,其成因可能与蒙古-鄂霍茨克造山带后碰撞和/或后造山伸展过程以及东部古太平洋板块向欧亚大陆俯冲的远程效应有关;锆石Lu-Hf和钾长石Pb-O同位素组成显示红娘山杂岩体主要为古元古代晚期大陆地壳物质部分熔融产物。流体包裹体研究结果显示泉子沟矿床主成矿阶段流体为中高温、中高盐度流体,成矿晚阶段流体主要属于中温、中低盐度流体,成矿流体总体属H2O-NaCl-CO2体系。石英H-O同位素组成表明主成矿阶段的流体以岩浆水为主,成矿晚阶段有少量的大气降水加入;硫化物S-Pb同位素组成表明流体中的硫、铅均主要来自岩浆。硫化物LA-ICP-MS微量成分分析结果显示,辉钼矿富集W、Re、Se、V、Te等元素,但不同阶段辉钼矿微量成分含量差异较小。泉子沟矿床黄铁矿可划分为成矿早、中、晚阶段结晶沉淀的原生黄铁矿Py1a、Py2a、Py3以及早、中阶段受后期热液改造形成的黄铁矿Py1b、Py2b共5个世代。从Py1a到Py2a,Co、Ni含量和Co/Ni均降低,而As、Se、Te含量上升;Py3中,Co、Ni、Se、Te含量以及Co/Ni比值均很低,暗示了黄铁矿结晶环境由高温岩浆热液向中低温岩浆热液演化。流体包裹体研究和硫化物原位微区成分分析结果表明,流体沸腾是泉子沟矿床矿质沉淀的主要机制。在晚印支期,乌力吉-林西造山带转入后造山演化阶段,集宁南部地区处于伸展环境,形成石英斑岩、正长花岗斑岩等花岗质斑岩,与其相关,产出大苏计斑岩型钼矿床。至燕山期的晚侏罗世,研究区可能受北部蒙古-鄂霍茨克造山带后碰撞和/或后造山作用及东部古太平洋板块俯冲远程效应的双重影响,使该区处于伸展环境。伸展引起下地壳发生部分熔融,形成浅成花岗质杂岩,与其相关形成泉子沟和曹四夭斑岩钼矿床。晚侏罗世末期-早白垩世期间,该区可能主要受东部古太平洋板块俯冲影响,处于弧后伸展环境,导致广泛的晚侏罗世-早白垩世的陆相火山喷发,与其相关形成陆相火山岩型铅锌银金矿床,即浅成低温热液型铅锌银金矿床。
Abstract
hua bei ke la tong bei yuan mu kuang dai shi jin ci yu dong qin ling mu kuang dai he xiao xing an ling -zhang an cai ling mu kuang dai de zhong guo di san da mu kuang dai 。gai kuang dai de mu kuang chuang zhu yao chan chu yu he bei sheng he bei jing de bei bu yan shan de ou ji liao ning sheng xi bu ,chuan tong shang bei chen wei yan liao mu kuang dai 。jin nian lai ,zhuo zi xian da su ji da xing ban yan mu kuang chuang 、xing he xian cao si wai chao da xing ban yan mu kuang chuang yi ji feng zhen shi quan zi gou da xing ban yan mu kuang chuang de fa xian ,shi yan liao cheng kuang dai zui xi duan de nei meng gu ji ning na bu de ou cheng wei hua bei ke la tong bei yuan de ling yi ge da xing mu kuang ji ou 。mu qian ,ji ning na bu de ou mu kuang chuang de cheng kuang wu zhi lai yuan 、yuan su qian yi 、fu ji ji chen dian ji zhi ji ji yu zhong sheng dai yan jiang huo dong de guan ji reng ran bu qing ,yan chong ying xiang le dui hua bei ke la tong bei yuan mu cheng kuang zuo yong de li jie he xia yi bu zhao kuang gong zuo de kai zhan ,yin ci ,ji xu kai zhan ji tong de yan jiu 。ben wen yi ji ning na bu de ou 2ge ban yan xing mu kuang chuang （cao si wai kuang chuang he quan zi gou kuang chuang ）wei yan jiu dui xiang ,zai xiang xi yan jiu kuang chuang de zhi te zheng ji chu shang ,cai yong fu kuang wu 、liu hua wu ji chan ge rong rong bao guo ti LA-ICP-MSwei liang yuan su fen xi ,juan yun mu Ar-Ar、liu hua wu Rb-Sr、gao dan U-Pb、hui mu kuang Re-Osdeng ding nian ,gao dan Lu-Hf、jia chang dan Pb-O、dan ying H-O、liu hua wu S-Pbdeng tong wei su shi zong ,yi ji yan dan de hua he liu ti bao guo ti ce wen ji cheng fen fen xi deng fang fa ,shen ru jie pou cao si wai he quan zi gou 2ge kuang chuang ,jin er tan tao ji ning na bu de ou mu kuang chuang de cheng yan cheng kuang zuo yong guo cheng 。cao si wai kuang chuang de mu zi yuan liang da 1.75 Mt,kuang ti zhu yao chan yu cao si wai za yan ti yu de ceng de wai jie chu dai ,hui mu kuang zhu yao yi xi mai he wang mai xing shi fu cun zai ji ning （yan ）qun huang tu yao zu jian li yan 、bian li yan 、xin yuan gu dai hui lu yan ji yan shan ji hua gang zhi ban yan zhong 。kuang ou zheng chang hua gang ban yan zhong de juan yun mu 40Ar/39Ardeng shi xian nian ling he wai wei mai zhuang qian xin jin （yin ）kuang ti zhong liu hua wu de Rb-Srdeng shi xian nian ling fen bie wei 146.4±2.2 Mahe 145.3±1.0 Ma,an shi er zhe shu yu tong yi ban yan cheng kuang ji tong 。liu hua wu LA-ICP-MSwei liang yuan su han liang de bian hua ,an shi le cao si wai kuang chuang you cheng kuang zao jie duan zhi wan jie duan ,cheng kuang liu ti you yu yan jiang huo dong you guan de gao wen re ye ,xiang di wen re ye yan bian de guo cheng 。rong rong bao guo ti LA-ICP-MSwei liang yuan su zu cheng biao ming ,cao si wai kuang chuang yu cheng kuang mi qie xiang guan de zheng chang hua gang ban yan chu shi hua gang zhi yan jiang wei fu han Mg、Mn、Fe、Tideng yuan su de gui suan yan zhi yan jiang ,tong guo jie jing fen yi shi yan jiang zhong de hui fa fen （H2O、CO2、CH4、S、Cldeng ）guo bao he 。dang fu han hui fa fen de zhong suan xing yan jiang cong shen bu yan jiang fang xiang shang yun yi shi fa sheng chu rong ,yin wen du 、ya li de jiang di xiang bian wei yan jiang qi ye ,cong er zao cheng liu ti xiang he rong ti xiang de bu hun rong ,shi hui fa fen zhong fu ji de cheng kuang yuan su （Mo、Fe、Cudeng ）zai you li bu wei jie jing cheng kuang ,er rong ti xiang ze zhu jian yan bian cheng yi chong pin Mg、Mn、Fe、Ti,er xiang dui fu H2Ohe CO2de can yu rong rong ti ,zui zhong yan bian wei ji hu zhi you SiO2he H2Oyi ji shao liang jian jin shu de liu ti 。hou ji qin wei de er chang hua gang ban yan wei jian ming xian kuang hua ,ke neng yu ji yuan shi yan jiang zhong que fa S、Cldeng hui fa fen you guan 。quan zi gou da xing ban yan mu kuang chuang （yao 0.12 Mt Mo）kuang ou chu lou yi tao yan shan ji hua gang zhi za yan ti ——gong niang shan za yan ti ,zhu yao you zhong cu li hua gang yan 、shi ban zhuang hua gang yan he dan ying ban yan zu cheng ,mu kuang ti zhu yao fu cun yu shi ban zhuang hua gang yan zhong 。hui mu kuang Re-Oshe gao dan U-Pbding nian jie guo biao ming ,quan zi gou mu kuang chuang xing cheng yu wan zhu luo shi zao ji （162Ma）,cheng kuang yu shi ban zhuang hua gang yan guan ji mi qie 。kuang ou gong niang shan za yan ti yan dan jun fu gui he jian ,pin MgO、CaO、FeOhe Fe2O3,yan dan lei xing wei zheng chang hua gang yan he jian xing hua gang yan ,shu gao jia gai jian xing ji lie de Ixing hua gang yan ,xing cheng yu hou zao shan shen zhan huan jing ,ji cheng yin ke neng yu meng gu -e huo ci ke zao shan dai hou peng zhuang he /huo hou zao shan shen zhan guo cheng yi ji dong bu gu tai ping xiang ban kuai xiang ou ya da liu fu chong de yuan cheng xiao ying you guan ;gao dan Lu-Hfhe jia chang dan Pb-Otong wei su zu cheng xian shi gong niang shan za yan ti zhu yao wei gu yuan gu dai wan ji da liu de ke wu zhi bu fen rong rong chan wu 。liu ti bao guo ti yan jiu jie guo xian shi quan zi gou kuang chuang zhu cheng kuang jie duan liu ti wei zhong gao wen 、zhong gao yan du liu ti ,cheng kuang wan jie duan liu ti zhu yao shu yu zhong wen 、zhong di yan du liu ti ,cheng kuang liu ti zong ti shu H2O-NaCl-CO2ti ji 。dan ying H-Otong wei su zu cheng biao ming zhu cheng kuang jie duan de liu ti yi yan jiang shui wei zhu ,cheng kuang wan jie duan you shao liang de da qi jiang shui jia ru ;liu hua wu S-Pbtong wei su zu cheng biao ming liu ti zhong de liu 、qian jun zhu yao lai zi yan jiang 。liu hua wu LA-ICP-MSwei liang cheng fen fen xi jie guo xian shi ,hui mu kuang fu ji W、Re、Se、V、Tedeng yuan su ,dan bu tong jie duan hui mu kuang wei liang cheng fen han liang cha yi jiao xiao 。quan zi gou kuang chuang huang tie kuang ke hua fen wei cheng kuang zao 、zhong 、wan jie duan jie jing chen dian de yuan sheng huang tie kuang Py1a、Py2a、Py3yi ji zao 、zhong jie duan shou hou ji re ye gai zao xing cheng de huang tie kuang Py1b、Py2bgong 5ge shi dai 。cong Py1adao Py2a,Co、Nihan liang he Co/Nijun jiang di ,er As、Se、Tehan liang shang sheng ;Py3zhong ,Co、Ni、Se、Tehan liang yi ji Co/Nibi zhi jun hen di ,an shi le huang tie kuang jie jing huan jing you gao wen yan jiang re ye xiang zhong di wen yan jiang re ye yan hua 。liu ti bao guo ti yan jiu he liu hua wu yuan wei wei ou cheng fen fen xi jie guo biao ming ,liu ti fei teng shi quan zi gou kuang chuang kuang zhi chen dian de zhu yao ji zhi 。zai wan yin zhi ji ,wu li ji -lin xi zao shan dai zhuai ru hou zao shan yan hua jie duan ,ji ning na bu de ou chu yu shen zhan huan jing ,xing cheng dan ying ban yan 、zheng chang hua gang ban yan deng hua gang zhi ban yan ,yu ji xiang guan ,chan chu da su ji ban yan xing mu kuang chuang 。zhi yan shan ji de wan zhu luo shi ,yan jiu ou ke neng shou bei bu meng gu -e huo ci ke zao shan dai hou peng zhuang he /huo hou zao shan zuo yong ji dong bu gu tai ping xiang ban kuai fu chong yuan cheng xiao ying de shuang chong ying xiang ,shi gai ou chu yu shen zhan huan jing 。shen zhan yin qi xia de ke fa sheng bu fen rong rong ,xing cheng jian cheng hua gang zhi za yan ,yu ji xiang guan xing cheng quan zi gou he cao si wai ban yan mu kuang chuang 。wan zhu luo shi mo ji -zao bai e shi ji jian ,gai ou ke neng zhu yao shou dong bu gu tai ping xiang ban kuai fu chong ying xiang ,chu yu hu hou shen zhan huan jing ,dao zhi an fan de wan zhu luo shi -zao bai e shi de liu xiang huo shan pen fa ,yu ji xiang guan xing cheng liu xiang huo shan yan xing qian xin yin jin kuang chuang ,ji jian cheng di wen re ye xing qian xin yin jin kuang chuang 。
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论文作者分别是来自中国地质科学院的张明玉，发表于刊物中国地质科学院2019-06-27论文，是一篇关于微量成分分析论文,熔融包裹体和流体包裹体论文,成矿作用论文,曹四夭斑岩钼矿床论文,泉子沟斑岩钼矿床论文,集宁南部地区论文,中国地质科学院2019-06-27论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自中国地质科学院2019-06-27论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：微量成分分析论文; 熔融包裹体和流体包裹体论文; 成矿作用论文; 曹四夭斑岩钼矿床论文; 泉子沟斑岩钼矿床论文; 集宁南部地区论文; 中国地质科学院2019-06-27论文;