云南大红山铁铜矿重磁解释
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摘要
大红山铁铜矿产于早元古界大红山群红山组、曼岗河组古海相火山岩中。为了详细研究该矿的重磁特征,在矿区布设一条重磁精测剖面,结合物性测试与模型进行重磁正演建模。结果显示:岩矿石磁倾角主要集中在30°附近,与当地的正常倾角吻合,表明基性岩体受后期位移改造不明显;铁矿与红山组表现出高重力高磁异常特征,铜矿与曼岗河组表现出较低的重力与磁异常特征;正演模拟显示铁铜矿应该为重磁同源体,但在地面的响应特征不尽相同。高磁高重的异常响应特征主体应为红山组与其内部的铜铁矿、铁矿,次为曼岗河组与其内部的铜铁矿、铁矿;而铜矿由于埋深较大等原因,重磁响应不明显。
Dahongshan iron-copper mine is produced in ancient marine facies volcanic rocks Early Proterozoic,and also produced in Dahongshan Group's Honghsan Formation and Manganghe Formation. In order to study the characteristic of gravity and magnetic in detail,a precision profile of gravity and magnetic was laid in the area,and gravity and magnetic forward model created to simulate the characteristic of gravity and magnetic with the physical properties of rocks and ores. The results show that the magnetic dip of rocks and ores is mainly concentrated in the vicinity of 30°,and coincided to the natural magnetic dip of the area. There are no obvious late displacement and reconstruction to the base rock mass. Iron mine and Hongshan Formation show high gravity and magnetic characteristic,while copper mine and Manganghe Formation show lower gravity and magnetic characteristic. Forward modeling of the gravity and magnetic of iron-copper mine should be homologous,but their response character is not necessarily the same on the ground. The main part of gravity and magnetic response characteristic should be the Hongshan Formation and inside copper-iron mine and iron mine. The secondary part of gravity and magnetic response characteristic should be the Manganghe Formation and inside copper-iron mine and iron mine. And the response characteristic of copper mine is not obvious,maybe deep buried.
Dahongshan iron-copper mine is produced in ancient marine facies volcanic rocks Early Proterozoic,and also produced in Dahongshan Group's Honghsan Formation and Manganghe Formation. In order to study the characteristic of gravity and magnetic in detail,a precision profile of gravity and magnetic was laid in the area,and gravity and magnetic forward model created to simulate the characteristic of gravity and magnetic with the physical properties of rocks and ores. The results show that the magnetic dip of rocks and ores is mainly concentrated in the vicinity of 30°,and coincided to the natural magnetic dip of the area. There are no obvious late displacement and reconstruction to the base rock mass. Iron mine and Hongshan Formation show high gravity and magnetic characteristic,while copper mine and Manganghe Formation show lower gravity and magnetic characteristic. Forward modeling of the gravity and magnetic of iron-copper mine should be homologous,but their response character is not necessarily the same on the ground. The main part of gravity and magnetic response characteristic should be the Hongshan Formation and inside copper-iron mine and iron mine. The secondary part of gravity and magnetic response characteristic should be the Manganghe Formation and inside copper-iron mine and iron mine. And the response characteristic of copper mine is not obvious,maybe deep buried.
引文
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[3]刘伟,邓明国.云南省大红山铜铁矿床中菱铁矿的成因探讨[J].矿物学报,2011(S1):367-368.
[4]姚巍,陈珲.大红山铁铜矿区构造体系及矿体空间展布分析[J].吉林地质,2012,31(2):38-41.
[5]宁佐金.新平大红山铜铁矿床控矿因素及成因分析[J].云南地质,2010,29(4):409-415.
[6]宋昊,徐争启,张成江,等.浅析云南大红山铁铜矿床成因:一个特殊的VMS矿床?[J].高校地质学报,2013,19(S):322-323.
[7]王峰.大红山铜矿控矿条件及找矿方向[J].有色金属设计,2002,29(1):24-26.
[8]蔺朝晖.大红山铁矿I号铁铜矿带的矿床成因探析[J].有色金属设计,2005,32(3):18-22,30.
[9]胡光龙,韩繁国.大红山铜矿I号铁铜矿带成矿控矿因素及分布富集规律[J].云南冶金,2006,35(5):6-13.
[10]吴孔文,钟宏,朱维光,等.云南大红山层状铜矿床成矿流体研究[J].岩石学报,2008,24(9):2045-2057.
[11]李建飞.大红山铁铜矿Ⅲ2a、Ⅱ5-4矿体对比及探矿建议[J].云南地质,2011,30(4):439-442.
[12]崔银亮,秦德先,高俊,等.云南金平龙脖河铜矿床与新平大红山铁铜矿床对比研究[J].中国工程科学,2005,7(S):195-201.
[13]张蓉,向龙洲,代达龙,等.云南新平大红山铁矿地球物理找矿模型及标志[J].云南地质,2012,31(4):497-500.
[14]邓明国.新平大红山-元江撮科铜铁多金属成矿系列及成矿预测[D].昆明:昆明理工大学,2010.
[15]云南省地质矿产局地球物理地球化学勘查队.云南省区域物化探资料综合研究报告[R].宜良:云南省地质矿产局地球物理地球化学勘查队,1990.
[16]地质部航测大队.云南中部及东部地区航空物探(磁及放射性)结果报告[R].昆明:云南省地质矿产勘查开发局,1960.
[17]云南省地质局物探队.云南省新平县大红山铁、铜矿区及外围物、化探(磁法、金测)工作结果报告[R].昆明:云南省地质矿产勘查开发局,1970.
[18]钱锦和,沈远仁.云南大红山古火山岩铁铜矿[M].北京:地质出版社,1990.