本文主要研究内容
作者王明格(2019)在《冀东马城BIF型铁矿床成矿规律及远景评价》一文中研究指出:马城BIFs铁矿床位于华北地台、燕山台褶带、山海关隆起西南边缘之青龙河断陷带东部,地处河北东部滦南县境内。本文对马城铁矿床的成矿环境进行了详细研究,方法包括流体包裹体测温、主微量\稀土和H-O同位素分析,并结合区域构造-建造分析最终确立了该矿床的成矿模式。在此基础上,通过对马城铁矿勘查资料的研究,建立了该矿床三维地质模型,圈定了远景评价区域并对其做出了定性评价。锆石SHRIMP U-Pb测年及相关年龄资料数据显示,矿体顶底板黑云变粒、黑云斜长片麻岩和矿体中钾化混合花岗岩年龄2529±7Ma~2539±8Ma,代表了 BIF的形成年龄和滦县群火山沉积年龄。流体包裹体测温显示,马城铁矿变质峰期均一主体温度为250~350℃,后期低温蚀变主体温度为150~200℃,并且各期包裹体温度和盐度变化范围较大,可能代表了后期蚀变具有多期性的特点。马城铁矿主量元素中,SiO2+TFe2O3+MgO平均总含量很高,占到了90%以上,而其它氧化物组分含量很低且Al2O3+TiO2的含量非常低。这均表明马城铁矿石原始形成为较为纯净化学沉积,陆源碎屑物质基本没有参与。矿石中MnO/TFe2O3比值极低,均值为0.002,K2O/Na2O<1,均表现出热水沉积成因特征。马城铁矿Co/Zn、Ni/Zn 比值及其它微量元素特征共同表明,马城铁矿成矿物质与存在于沉积盆地中的火山活动而带来的热液有关。马城铁矿轻稀土元素相对亏损,中重稀土元素相对富集,La、Y正异常以及Y/Ho 比值与现代海水接近,均表明马城铁矿∑REE+Y具有海水特征;强烈Eu正异常则呈现出热液稀土元素特征;(La/Yb)N<1则又表明具有海水与热液叠加混合特征;Ce/Ce*范围变化于0.82-0.95之间,比值<1,无明显异常,则指示马城铁矿形成时总体处于缺氧环境。H-O同位素及δD-δ18O水分析又表明,马城铁矿石石英的形成流体环境与变质水接近。结合成矿年代与火山活动关系,认为马城BIFs铁矿床的形成其成矿物质来源与25亿年前太古代末期海底火山活动期及间歇期所产生的大量热液流体有关,基本与陆源物质无关。火山作用及流体高温加热使处于缺氧环境的海水温度升高,进而形成海水与热液流体叠加的混合流体。混合流体主体温度在250-300℃,混合流体淋滤、萃取原火山冷凝、沉积物中铁、硅物质形成BIF,并伴随有绿帘-角闪岩相的变质作用。含铁岩系及地球化学特征对比分析表明,马城铁矿与司家营铁矿为大型向斜构造并且在深部存在转折端可能性不大,此区域找矿前景不大。剖面与三维实体模型对比分析,证实马城铁矿Ⅱ号矿体在0线-580m存在合围现象,呈现紧闭倒转褶曲向斜构造特征;Ⅰ号矿与Ⅲ号矿体在23线-1140m标高合围并呈现紧闭倒转褶曲向斜构造特征;物探及钻探推测V矿体在深部已趋于“向形”的转折端。以上发现,证明了马城铁矿存在向斜构造特征。结合地质剖面、三维地质模型及物探资料对马城铁矿床矿区范围内远景展开评价,并最终图定Ⅱ号矿体深部等3个极有潜力远景区。
Abstract
ma cheng BIFstie kuang chuang wei yu hua bei de tai 、yan shan tai zhe dai 、shan hai guan long qi xi na bian yuan zhi qing long he duan xian dai dong bu ,de chu he bei dong bu luan na xian jing nei 。ben wen dui ma cheng tie kuang chuang de cheng kuang huan jing jin hang le xiang xi yan jiu ,fang fa bao gua liu ti bao guo ti ce wen 、zhu wei liang \xi tu he H-Otong wei su fen xi ,bing jie ge ou yu gou zao -jian zao fen xi zui zhong que li le gai kuang chuang de cheng kuang mo shi 。zai ci ji chu shang ,tong guo dui ma cheng tie kuang kan cha zi liao de yan jiu ,jian li le gai kuang chuang san wei de zhi mo xing ,juan ding le yuan jing ping jia ou yu bing dui ji zuo chu le ding xing ping jia 。gao dan SHRIMP U-Pbce nian ji xiang guan nian ling zi liao shu ju xian shi ,kuang ti ding de ban hei yun bian li 、hei yun xie chang pian ma yan he kuang ti zhong jia hua hun ge hua gang yan nian ling 2529±7Ma~2539±8Ma,dai biao le BIFde xing cheng nian ling he luan xian qun huo shan chen ji nian ling 。liu ti bao guo ti ce wen xian shi ,ma cheng tie kuang bian zhi feng ji jun yi zhu ti wen du wei 250~350℃,hou ji di wen shi bian zhu ti wen du wei 150~200℃,bing ju ge ji bao guo ti wen du he yan du bian hua fan wei jiao da ,ke neng dai biao le hou ji shi bian ju you duo ji xing de te dian 。ma cheng tie kuang zhu liang yuan su zhong ,SiO2+TFe2O3+MgOping jun zong han liang hen gao ,zhan dao le 90%yi shang ,er ji ta yang hua wu zu fen han liang hen di ju Al2O3+TiO2de han liang fei chang di 。zhe jun biao ming ma cheng tie kuang dan yuan shi xing cheng wei jiao wei chun jing hua xue chen ji ,liu yuan sui xie wu zhi ji ben mei you can yu 。kuang dan zhong MnO/TFe2O3bi zhi ji di ,jun zhi wei 0.002,K2O/Na2O<1,jun biao xian chu re shui chen ji cheng yin te zheng 。ma cheng tie kuang Co/Zn、Ni/Zn bi zhi ji ji ta wei liang yuan su te zheng gong tong biao ming ,ma cheng tie kuang cheng kuang wu zhi yu cun zai yu chen ji pen de zhong de huo shan huo dong er dai lai de re ye you guan 。ma cheng tie kuang qing xi tu yuan su xiang dui kui sun ,zhong chong xi tu yuan su xiang dui fu ji ,La、Yzheng yi chang yi ji Y/Ho bi zhi yu xian dai hai shui jie jin ,jun biao ming ma cheng tie kuang ∑REE+Yju you hai shui te zheng ;jiang lie Euzheng yi chang ze cheng xian chu re ye xi tu yuan su te zheng ;(La/Yb)N<1ze you biao ming ju you hai shui yu re ye die jia hun ge te zheng ;Ce/Ce*fan wei bian hua yu 0.82-0.95zhi jian ,bi zhi <1,mo ming xian yi chang ,ze zhi shi ma cheng tie kuang xing cheng shi zong ti chu yu que yang huan jing 。H-Otong wei su ji δD-δ18Oshui fen xi you biao ming ,ma cheng tie kuang dan dan ying de xing cheng liu ti huan jing yu bian zhi shui jie jin 。jie ge cheng kuang nian dai yu huo shan huo dong guan ji ,ren wei ma cheng BIFstie kuang chuang de xing cheng ji cheng kuang wu zhi lai yuan yu 25yi nian qian tai gu dai mo ji hai de huo shan huo dong ji ji jian xie ji suo chan sheng de da liang re ye liu ti you guan ,ji ben yu liu yuan wu zhi mo guan 。huo shan zuo yong ji liu ti gao wen jia re shi chu yu que yang huan jing de hai shui wen du sheng gao ,jin er xing cheng hai shui yu re ye liu ti die jia de hun ge liu ti 。hun ge liu ti zhu ti wen du zai 250-300℃,hun ge liu ti lin lv 、cui qu yuan huo shan leng ning 、chen ji wu zhong tie 、gui wu zhi xing cheng BIF,bing ban sui you lu lian -jiao shan yan xiang de bian zhi zuo yong 。han tie yan ji ji de qiu hua xue te zheng dui bi fen xi biao ming ,ma cheng tie kuang yu si jia ying tie kuang wei da xing xiang xie gou zao bing ju zai shen bu cun zai zhuai she duan ke neng xing bu da ,ci ou yu zhao kuang qian jing bu da 。pou mian yu san wei shi ti mo xing dui bi fen xi ,zheng shi ma cheng tie kuang Ⅱhao kuang ti zai 0xian -580mcun zai ge wei xian xiang ,cheng xian jin bi dao zhuai zhe qu xiang xie gou zao te zheng ;Ⅰhao kuang yu Ⅲhao kuang ti zai 23xian -1140mbiao gao ge wei bing cheng xian jin bi dao zhuai zhe qu xiang xie gou zao te zheng ;wu tan ji zuan tan tui ce Vkuang ti zai shen bu yi qu yu “xiang xing ”de zhuai she duan 。yi shang fa xian ,zheng ming le ma cheng tie kuang cun zai xiang xie gou zao te zheng 。jie ge de zhi pou mian 、san wei de zhi mo xing ji wu tan zi liao dui ma cheng tie kuang chuang kuang ou fan wei nei yuan jing zhan kai ping jia ,bing zui zhong tu ding Ⅱhao kuang ti shen bu deng 3ge ji you qian li yuan jing ou 。
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论文作者分别是来自北京科技大学的王明格,发表于刊物北京科技大学2019-06-27论文,是一篇关于马城铁矿论文,成矿规律论文,成矿流体论文,构造背景论文,远景评价论文,北京科技大学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,资料来自北京科技大学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:马城铁矿论文; 成矿规律论文; 成矿流体论文; 构造背景论文; 远景评价论文; 北京科技大学2019-06-27论文;