贵州从江九星铁矿床赋矿变质围岩地球化学特征及其地质意义
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摘要
为探讨九星铁矿床的成矿与围岩(赋矿地层)的关系,系统采集了九星铁矿床赋矿变质围岩(绿泥石片岩和绿泥石千枚岩)样品进行元素地球化学分析。结果表明,两类赋矿变质围岩有如下特点:高硅铝、富钾镁且碱质总量偏低;富集大离子亲石元素,亏损高场强元素;轻稀土相对富集,重稀土相对亏损,轻重稀土分馏明显,具有Eu负异常与弱Ce正异常。赋矿变质围岩的原岩为铁质泥岩及纯泥质岩,沉积原岩物源主要为酸性火山岩区的长英质物源或长英质与基性岩混合物源,构造背景为被动大陆边缘。稀土元素示踪结果显示九星铁矿床磁铁矿与围岩稀土元素配分特征基本一致,综合分析认为九星铁矿床的成矿物质主要来源于围岩(赋矿地层)。
In order to constrain the relationship between mineralization and wall rocks in the Jiuxing Fe deposit,whole rock geochemistry of wall rocks from the deposit are systematically analyzed. The results show that both chlorite phyllite and chlorite schist have high silicon,aluminum,potassium and magnesium,low sodium and calcium and total alkalinity.They are characterized by relative enrichment of large ion lithophile elements and depletion of high field strength elements.The rocks are enriched in LREE,relatively depleted in HREE and display significant fractionation between LREE and HREE. Both two types of the rocks have strong negative Eu anomalies and weak positive Ce anomalies,indicating that they were deposited in a weakly reduced environment. The source rocks of both chlorite phyllite and chlorite schist were ironrich mudstone and mudstone,which were mainly originated from felsic rocks or the mixture of felsic and basic rocks at the passive continental margin. In addition,magnetite of the deposit has similar REE patterns as wall rock. All geochemical features of magnetite and wall rock suggest that ore metals are mostly from the strata.
In order to constrain the relationship between mineralization and wall rocks in the Jiuxing Fe deposit,whole rock geochemistry of wall rocks from the deposit are systematically analyzed. The results show that both chlorite phyllite and chlorite schist have high silicon,aluminum,potassium and magnesium,low sodium and calcium and total alkalinity.They are characterized by relative enrichment of large ion lithophile elements and depletion of high field strength elements.The rocks are enriched in LREE,relatively depleted in HREE and display significant fractionation between LREE and HREE. Both two types of the rocks have strong negative Eu anomalies and weak positive Ce anomalies,indicating that they were deposited in a weakly reduced environment. The source rocks of both chlorite phyllite and chlorite schist were ironrich mudstone and mudstone,which were mainly originated from felsic rocks or the mixture of felsic and basic rocks at the passive continental margin. In addition,magnetite of the deposit has similar REE patterns as wall rock. All geochemical features of magnetite and wall rock suggest that ore metals are mostly from the strata.
引文
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杜定全,刘志臣,孙士军,顾尚义,陈璠,杜威.2010.黔东南地区金矿控矿构造的空间关系分析.矿物岩石地球化学通报,29(4):380-387
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刘灵,王康年,李吉春,曾昭光,张华.2003.贵州从江地区滑脱构造初步研究.贵州地质,20(3):139-144
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马玉波,杜晓慧,张增杰,邢树文,邹跃飞,李斌,杨秀清,王岩.2013.青城子层状/脉状铅锌矿床稀土元素地球化学特征及地质意义.矿床地质,32(6):1236-1248
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王仁民.1987.变质岩原岩图解判别法.北京:地质出版社
王尚彦.2006.贵州东部金矿.北京:地质出版社
许威.2014.滇西允沟岩组变质岩地球化学特征与原岩恢复.硕士学位论文.成都:成都理工大学,1-48
赵振华.1997.微量元素地球化学原理.北京:科学出版社
周家喜,黄智龙,周国富,金中国,李晓斌,丁伟,谷静.2010.黔西北赫章天桥铅锌矿床成矿物质来源:S、Pb同位素和REE制约.地质论评,56(4):513-524
周家喜,黄智龙,周国富,李晓彪,丁伟,谷静.2009.贵州天桥铅锌矿床分散元素赋存状态及规律.矿物学报,29(4):471-480
Floyd P A,Leveridge B E.1987.Tectonic environment of the Devonian Gramscatho basin,south Cornwall:Framework mode and geochemical evidence from turbiditic sandstones.Journal of Geological Society,144(4):531-542
Jones B,Manning A C.1994.Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones.Chemical Geology,111(1-4):111-129
Maynard J B,Valloni R,Yu H S.1982.Composition of modern deepseasands from arc-related basins.Geological Society,London,Special Publications,10(1):551-561
Roser B P,Korsch R J.1986.Determination of tectonic setting of sandstone-mudstone suites using SiO2content and K2O/Na2O ratio.The Journal of Geology,94(5):635-650
Roser B P,Korsch R J.1988.Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of majorelement data.Chemical Geology,67(1-2):119-139
Shaw D M.1972.The origin of the Apsley gneiss,Ontario.Canadian Journal of Earth Sciences,9(1):18-35
Simonen A.1953.Stratigraphy and sedimentation of the Svecofennidic,early Archean supracrustal rocks in southwestern Finland.Bulletin of the Geological Society of Finland,160:1-64
Taylor B E,South B C.1985.Regional stable isotope systematics of hydrothermal alteration and massive sulfide deposition in the West Shasta district,California.Economic Geology,80(8):2149-2163
白宪洲,何明友,王玉婷,杨学俊.2010.四川若尔盖地区西康群地球化学特征及其物源区和古风化程度分析.现代地质,24(1):151-157
陈璠,杜定全,孙士军,张家勇.2009.贵州从江地虎-九星金矿流体包裹体研究.贵州地质,26(2):125-128
戴传固,胡明扬,陈建书,王敏,王雪华.2015.贵州重要地质事件及其地质意义.贵州地质,32(1):1-9,14
戴传固,胡明扬,陈建书,王敏,张慧.2013.贵州雪峰---加里东构造旋回期成矿地质背景研究.地学前缘,20(6):219-225
杜定全,刘志臣,孙士军,顾尚义,陈璠,杜威.2010.黔东南地区金矿控矿构造的空间关系分析.矿物岩石地球化学通报,29(4):380-387
高林志,戴传固,刘燕学,王敏,王雪华,陈建书,丁孝忠,张传恒,曹茜,刘建辉.2010.黔东南-桂北地区四堡群凝灰岩锆石SHRIMP U-Pb年龄及其地层学意义.地质通报,29(9):1259-1267
高林志,陆济璞,丁孝忠,王汉荣,刘燕学,李江.2013.桂北地区新元古代地层凝灰岩锆石U-Pb年龄及地质意义.中国地质,40(5):1443-1452
贵州省地质矿产局.1987.贵州省区域地质志.北京:地质出版社
贵州省地质调查院.2003.中华人民共和国(1∶5万宰便幅,高武幅)区域地质调查报告.贵阳贵州省地质调查院
何明勤,龙成雄,王甘露.2015.黔东南锦屏平秋金矿床成矿流体来源研究.矿物学报,35(4):498-501
何卫军,何明勤,马思根.2014.贵州从江九星铁矿床地质特征及控矿因素分析.贵州大学学报(自然科学版),32(1):44-48
何卫军.2015.贵州从江九星铁矿床成矿流体研究.硕士学位论文.贵阳:贵州大学,1-45
李纪,何兴华.2017.贵州天柱地区金矿地球化学特征及成矿作用探讨.贵州科学,35(2):36-42
刘灵,王康年,李吉春,曾昭光,张华.2003.贵州从江地区滑脱构造初步研究.贵州地质,20(3):139-144
刘晓文,李泽琴,王奖臻,黄从俊.2017.扬子西南缘拉拉IOCG矿床辉钼矿微量元素地球化学特征.矿物岩石地球化学通报,36(6):1056-1062
刘永坤,张均,刘安璐,申浩原,仲文斌,陈葛成.2015.黔东南从江九星铁金矿床磁铁矿地球化学特征及其地质意义.矿物学报,35(4):502-508
马思根,何明勤,周家喜,肖红俊.2013.贵州从江地虎铜金多金属矿床微量和稀土元素地球化学.矿物岩石地球化学通报,32(5):599-608
马玉波,杜晓慧,张增杰,邢树文,邹跃飞,李斌,杨秀清,王岩.2013.青城子层状/脉状铅锌矿床稀土元素地球化学特征及地质意义.矿床地质,32(6):1236-1248
汤中清.1989.判别变质岩原岩方法及其程序.四川地质学报,9(3):63-66,62
王劲松,周家喜,刘金海,马思根,张应文,何明勤.2014.黔东南从江宰便铜铅锌多金属成矿作用与找矿预测.北京:科学出版社
王仁民.1987.变质岩原岩图解判别法.北京:地质出版社
王尚彦.2006.贵州东部金矿.北京:地质出版社
许威.2014.滇西允沟岩组变质岩地球化学特征与原岩恢复.硕士学位论文.成都:成都理工大学,1-48
赵振华.1997.微量元素地球化学原理.北京:科学出版社
周家喜,黄智龙,周国富,金中国,李晓斌,丁伟,谷静.2010.黔西北赫章天桥铅锌矿床成矿物质来源:S、Pb同位素和REE制约.地质论评,56(4):513-524
周家喜,黄智龙,周国富,李晓彪,丁伟,谷静.2009.贵州天桥铅锌矿床分散元素赋存状态及规律.矿物学报,29(4):471-480
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