胶东尚家庄钼矿床Re-Os同位素年龄及其地质意义  被引量:28

The molybdenite Re-Os age and genetic analysis of the Shangjiazhuang Mo deposit in Jiaodong area

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作  者:李杰[1] 宋明春 王美云[3] 李世勇 周明岭 倪师军[6] 张成江 丁正江 岳跃破 

机构地区:[1]石家庄经济学院资源学院,河北石家庄050031 [2]山东省地质矿产勘查开发局,山东济南250013 [3]石家庄经济学院水资源与环境学院,河北石家庄050031 [4]山东省物化探勘查院,山东济南250013 [5]山东省第六地质矿产勘查院,山东威海264209 [6]成都理工大学地球化学系,四川成都610059 [7]都理工大学地球科学学院,四川成都610059 [8]山东省第三地质矿产勘查院,山东烟台264000

出  处:《中国地质》2013年第5期1612-1621,共10页Geology in China

基  金:山东省地质矿产勘查开发局科研项目(KY201004)资助

摘  要:尚家庄钼矿床产于燕山晚期伟德山超单元斑状花岗闪长岩中,受岩体内部裂隙构造控制,呈NW走向,主矿体呈似层状、大脉状产出,具分支复合、膨胀夹缩等特点。3件辉钼矿Re-Os同位素测年结果表明,模式年龄为(115.5±1.6)Ma^(117.6±1.6)Ma,平均年龄为(116.4±1.6)Ma,与胶东金矿大规模成矿的时代和赋矿围岩——伟德山超单元营盘单元的成岩时代一致,说明胶东地区存在与金成矿同期的钼矿成矿作用。The Shangjiazhuang Mo deposit is hosted in the porphyritic granodiorite which belongs to Weideshan Late Yanshanian ultra unit. It is controlled by the fractures in the interior of the magnaatic body and in NW direction. The main ore bodies assume stratoid and large vein forms, and are characterized by branching and recombination as well as expansion and pinch-out. R.e-Os dating of three molybdenite separates from ores has yielded weighted ages (115.5+l.6)Ma^(l17.6_+l.6)Ma, and a weighted mean age of (116.4+1.6)Ma, implying that the metaUogenic epoch of Mo is nearly identical with the large-scale metallogenic epoch of Au in Jiaodong area, and nearly the same as the diagenetic epoch of their country rock--Yingpan unit of Weideshan super unit. It is proved that there existed a series of Au and Mo ore-forming processes which occurred almost in the same metallogenic epoch and were related to Weideshan granite in [iaodong area.

关 键 词:尚家庄钼矿 RE-OS同位素年龄 伟德山超单元 成矿作用 胶东金矿 

分 类 号:P618.65[天文地球—矿床学] P597.3[天文地球—地质学]

 

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