| 松辽盆地南部钱家店铀矿床后生蚀变作用及其对铀成矿的约束 |
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| 引用本文： | 荣辉,焦养泉,吴立群,季东民,里宏亮,朱强,曹民强,汪小妹,李青春,谢惠丽.松辽盆地南部钱家店铀矿床后生蚀变作用及其对铀成矿的约束[J].地球科学,2016,41(1):153-166. |
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| 作者姓名： | 荣辉 焦养泉 吴立群 季东民 里宏亮 朱强 曹民强 汪小妹 李青春 谢惠丽 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室，湖北武汉 430074 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目CUG140810国家自然科学基金41502105中国石油辽河油田分公司重大项目LHYT-KTXMGLB-2010-JS-13848中国地质大学构造与油气资源教育部重点实验室开放基金项目TPR-2014-08中国地质大学构造与油气资源教育部重点实验室开放基金项目TPR-2015-08中国博士后科学基金项目2013M542089 |
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| 摘 要： | 目前对松辽盆地南部钱家店铀矿床成因的认识存在明显争议.本文利用偏光显微镜、扫描电镜、XRD等分析测试方法对该矿床后生蚀变作用进行了系统的研究，发现该矿床不同类型砂岩中矿物蚀变作用类型有:赤铁矿化、褐铁矿化、黄铁矿化、粘土化、碳酸盐化和铀矿化，其中黄铁矿化包括胶状黄铁矿化、草莓状黄铁矿化和粒状黄铁矿化，粘土化主要包括水云母化、高岭石化和伊利石化，碳酸盐化包括方解石化、铁白云石化和菱铁矿化.红色砂岩和黄色砂岩以赤铁矿化、褐铁矿化、水云母化、高岭石化、伊利石化和方解石化为主，但黄色砂岩中赤铁矿化、褐铁矿化及水云母化程度略低；灰色不含矿砂岩以微弱赤铁矿化、黄铁矿化、高岭石化、伊利石化、铁白云石化和菱铁矿化为主；灰色含矿砂岩中以黄铁矿化、高岭石化、伊利石化、铁白云石化、铀矿化和菱铁矿化为主；原生灰色砂岩以黄铁矿化和菱铁矿化为主.钱家店铀矿床演化历史和矿物之间的穿插关系分析显示，成岩期矿物蚀变以菱铁矿为代表，形成于中性-弱碱性环境；成矿早期矿物蚀变以赤铁矿、针铁矿、黄铁矿、水云母和高岭石等为代表，形成于酸性环境；成矿晚期矿物蚀变以伊利石和铁白云石为代表，形成于弱碱-碱性环境；成矿期后矿物蚀变以方解石为代表，形成于碱-强碱性环境.因此，钱家店铀矿床经历了成岩期中性-弱碱性环境→成矿早期酸性环境→成矿晚期弱碱-碱性环境→成矿期后碱-强碱性环境的转变.
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| 关 键 词： | 层间氧化带 砂岩型铀矿 钱家店铀矿床 松辽盆地 石油地质 |
| 收稿时间： | 2015-10-08 |
Epigenetic Alteration and Its Constraints on Uranium Mineralization from the Qianjiadian Uranium Deposit,Southern Songliao Basin |
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| Abstract: | There are many controversies about the metallogenic mechanism for the Qianjiadian uranium deposit in the southern Songliao basin. Using a series of tests including micropolariscope, SEM and XRD, the epigenetic alteration of the Qianjiadian uranium deposit have been described. It has been shown that this deposit contains six types of alteration: Haematization, ferritization, pyritization (gelatinous pyrite, framboidal pyrite and granular pyrite), argillation (hydromicazation, kaolinization and illitization), carbonatation (calcilization, ankeritization and sideritization) and uranium mineralization. Haematization, ferritization, hydromicazation, kaolinization, illitization and calcilization frequently occur in the red sandstones and yellow sandstones, and the extent of haematization, ferritization and hydromicazation is lower in the yellow sandstones than that in the red sandstones. Weak haematization, pyritization, kaolinization, illitization, ankeritization and sideritization can often be seen in the non-mineralized grey sandstones. Pyritization, kaolinization, illitization, ankeritization, uranium metallization and sideritization are primarily formed in the mineralized grey sandstones. Pyritization and sideritization often occur in the primary grey sandstones. The Qianjiadian uranium deposit has undergone neutral-alkalescent environment during the diagenetic period, acidic environment during the early metallogenic period, alkalescent-alkalic environment during the late metallogenic period, and alkali environment during the postmineralization. The neutral-alkalescent environment during the diagenetic period is characterized by formation of siderite. The acidic environment during the early metallogenic period is characterized by formation of hematite, allcharite, pyrite, gyulekhite and kaolinite. The alkalescent-alkalic environment during the late metallogenic period is characterized by formation of ankerite. The alkali environment during the postmineralization is characterized by formation of calcite. |
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