安徽省枞阳县马口铁矿床成矿流体特征研究
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摘要
安徽省枞阳县马口铁矿床位于长江中下游成矿带庐枞矿集区内,是区域与正长岩有关的铁铜铀矿床的典型代表。本文在详细野外地质特征观察的基础上,针对马口铁矿床开展了流体包裹体研究工作,明确从主成矿期磁铁矿化阶段至石英硫化物阶段,成矿流体由高温(350～400℃)向中温(220～280℃)演化,但流体的密度(0.8～1.2g/cm3)及盐度(18～20%)并未发生明显的改变,指示初始流体为高温热液,后期可能无其他来源流体混合。结合前人工作,推断马口铁矿床的形成与黄梅尖岩体分异的岩浆热液活动有关,基底三叠纪膏盐层及原始沉积的铁矿层可能提供了成矿物质。
The Makou iron ore deposit is located in the Lu-Zong ore-concentrated area in the middle and lower reaches of the Yangtze River, which is a typical representative of the iron-copper-uranium deposits related to syenite in the region. Based on the field observation of geological characteristics in detail, a study on fluid inclusions from the deposit was carried out, and it was made clear that from the main metallogenic stage of magnetite formation to quartz-sulfide stage ore-forming fluid evolved from high temperature(350～400℃) to medium temperature(220～280℃), but the density(0.8～1.2 g/cm3) and salinity(18% ～20%) of the fluid were not obviously changed, indicating that the initial fluid was high-temperature hydrothermal solution,which was not mixed late with other sources of fluids. Based on the previous work, it is concluded that the formation of the Makou iron ore deposit is related to the magmatic hydrothermal activity of the Huangmeijian rock mass differentiation, and the basement Triassic gypsum-salt layer and the original sedimentary iron ore layer may provide metallogenic materials.
The Makou iron ore deposit is located in the Lu-Zong ore-concentrated area in the middle and lower reaches of the Yangtze River, which is a typical representative of the iron-copper-uranium deposits related to syenite in the region. Based on the field observation of geological characteristics in detail, a study on fluid inclusions from the deposit was carried out, and it was made clear that from the main metallogenic stage of magnetite formation to quartz-sulfide stage ore-forming fluid evolved from high temperature(350～400℃) to medium temperature(220～280℃), but the density(0.8～1.2 g/cm3) and salinity(18% ～20%) of the fluid were not obviously changed, indicating that the initial fluid was high-temperature hydrothermal solution,which was not mixed late with other sources of fluids. Based on the previous work, it is concluded that the formation of the Makou iron ore deposit is related to the magmatic hydrothermal activity of the Huangmeijian rock mass differentiation, and the basement Triassic gypsum-salt layer and the original sedimentary iron ore layer may provide metallogenic materials.
引文
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[5]张舒,范裕,吴明安,王克友,赵文广,魏国辉.安徽庐枞盆地泥河铁矿床成矿流体性质:来自He-Ar-H-O同位素的证据[J].岩石学报,2016,32(2):377~389.
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[13]张舒,周涛发,蔡晓兵,张赞赞,吕博,岳运华.安徽庐枞盆地小岭地区深部隐伏侵入岩年代学研究[J].合肥工业大学学报(自然科学版),2017,40(3):403~408.
[14]张舒,周涛发,吴明安,张赞赞,薛怀民,李小东.长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究[J].地质学报,2017,91(7):1483~1505.
[15]薛怀民,马芳,曹光跃,王一鹏,郭秀艳.长江中下游庐枞火山岩盆地南侧钾质侵入岩带的成因[J].地质学报,2016,90(9):2233~2257.
[16]左晓敏,杜杨松,曹毅,岳紫龙,张爱萍,杜静国,黄文明,宋晓媚.安徽桂花冲铜矿床成矿流体演化特征研究[J].矿床地质,2016,35(1):117~129.
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[19]范裕,周涛发,袁峰,钱存超,陆三明,David Cooke.安徽庐江-枞阳地区A型花岗岩的LA-ICP-MS定年及其地质意义[J].岩石学报,2008,24(8):1715~1724.
[20]李祥征.枞阳县石矶测区东马鞍山组磁铁矿层的发现及找矿意义[J].安徽地质,2013,23(2):94~97.
[2]翟裕生,姚书振,林新多,周询若,万天丰.长江中下游地区铁铜(金)成矿规律[M].北京:地质出版社,1992:12~35.
[3]唐永成,吴言昌,储国正.安徽沿江地区铜金多金属矿床地质[M].北京:地质出版社,1998:1~359.
[4]周涛发,范裕,袁峰,宋传中,张乐骏,钱存超,陆三明,David RC.庐枞盆地侵入岩的时空格架及其对成矿的制约[J].岩石学报,2010,26(9):2694~2714.
[5]张舒,范裕,吴明安,王克友,赵文广,魏国辉.安徽庐枞盆地泥河铁矿床成矿流体性质:来自He-Ar-H-O同位素的证据[J].岩石学报,2016,32(2):377~389.
[6]张舒,吴明安,赵文广,张宜勇,李小东,汪晶.安徽庐江泥河铁矿床矿床地球化学特征及其对成因的制约[J].岩石学报,2014,30(5):1382~1396.
[7]张舒,吴明安,汪晶,李小东,赵文广,魏国辉.安徽庐枞盆地与正长岩有关的成矿作用[J].地质学报,2014,88(4):519~531.
[8]徐兆文,任启江,杨荣勇,王实.安徽庐枞地区脉状铜矿、铜金矿化分布规律和矿床模式[J].地质与勘探,1992,28(1):8~15.
[9]张乐骏.安徽庐枞盆地成岩成矿作用研究[D].合肥.合肥工业大学博士学位论文,2011:1~239.
[10]任启江,刘孝善,徐兆文.安徽庐枞中生代火山构造洼地及其成矿作用[M].北京:地质出版社,1991:1~145.
[11]王世伟,周涛发,袁峰,范裕,俞沧海,葛玲红,石诚,池月余.安徽沙溪斑岩型铜金矿床成岩序列及成岩成矿年代学研究[J].岩石学报,2014,30(4):979~994.
[12]周涛发,王彪,范裕,袁峰,张乐骏,钟国雄.庐枞盆地与A型花岗岩有关的磁铁矿-阳起石-磷灰石矿床—以马口铁矿床为例[J].岩石学报,2012,28(10):3087~3098.
[13]张舒,周涛发,蔡晓兵,张赞赞,吕博,岳运华.安徽庐枞盆地小岭地区深部隐伏侵入岩年代学研究[J].合肥工业大学学报(自然科学版),2017,40(3):403~408.
[14]张舒,周涛发,吴明安,张赞赞,薛怀民,李小东.长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究[J].地质学报,2017,91(7):1483~1505.
[15]薛怀民,马芳,曹光跃,王一鹏,郭秀艳.长江中下游庐枞火山岩盆地南侧钾质侵入岩带的成因[J].地质学报,2016,90(9):2233~2257.
[16]左晓敏,杜杨松,曹毅,岳紫龙,张爱萍,杜静国,黄文明,宋晓媚.安徽桂花冲铜矿床成矿流体演化特征研究[J].矿床地质,2016,35(1):117~129.
[17] Hall DL, Sterner SM, Bodnar RJ. Freezing point depression of NaCl-KCl-H2O solution composition by sequential freezing[J]. Economic geology, 1988, 80:1436~11439.
[18]卢焕章,范宏瑞,倪培,欧光习,沈昆,张文淮.流体包裹体[M].北京:科学出版社,2004:1~488.
[19]范裕,周涛发,袁峰,钱存超,陆三明,David Cooke.安徽庐江-枞阳地区A型花岗岩的LA-ICP-MS定年及其地质意义[J].岩石学报,2008,24(8):1715~1724.
[20]李祥征.枞阳县石矶测区东马鞍山组磁铁矿层的发现及找矿意义[J].安徽地质,2013,23(2):94~97.
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