成矿带的控矿构造

2025-03-28 09:54:56
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回答1:

铜多金属矿化集中区分布的总体趋势是北东向成带、东西向成行、北西向成列的带状排列,构成矿化-构造带;有的出现在多组线性构造交切割成的次级构造块体中,构成矿化-构造块体,有的位于多组线性构造汇聚的线性构造“结”上,构成矿化-构造结。铜多金属矿床在遥感构造上的部位主要有:①多组线性构造交切点,如布敦化铜矿构造具有两组断裂构造控矿(图3-11),一组南北向断裂构造,一组北西向断裂构造;②多组线性构造交切割成的次级构造块体边部;③一定方向的线性构造,如浩布高铜铅锌矿床(图3-12),有一组北北东向断裂构造控制矿体的分布;④环形构造中部;⑤环形构造外环缘内外侧,如多宝山铜钼矿床矿体分布于环形构造的外缘(图3-13);⑥多层状环形构造带等线-环构造组合部位,且在这些构造部位还常伴有次级的火山构造、次火山-浅成侵入岩体、铜等多金属元素金属量异常和航磁异常,如乌奴格吐山铜钼矿床矿体分布于火山环形构造的中部,并且有多个次极小火山环形构造互相组合在一起,构成火山组合控矿构造(图3-14),矿体受火山环形构造控制,并且次火山岩非常发育。

图3-11 布敦化铜矿构造与成矿的关系图

—燕山花岗岩

—燕山花岗斑岩

图3-12 浩布高铜铅锌矿床构造与成矿的关系图

图3-13 多宝山铜钼矿床构造与成矿的关系图

图3-14 乌奴格吐山铜钼矿床构造与成矿的关系

成矿带由北东向和东西向构造带构成的构造大格局是主要的导矿构造,北西向和南东向构造与其组成的构造小格局对矿床、矿体的定位起重要作用。就构造总体控矿趋势而言,区域性线-环构造带控制了矿化构造带的展布,构造块体及构造结控制了矿化集中区的出现,而线性构造、线性构造交切点以及环形构造层缘界面确定矿床的定位,构成了成矿带“带、块、结、点、缘”的区域性控矿构造特征(图3-15)。

图3-15 区域(遥感)构造与多金属成矿关系图

(据植起汉等,1996,改编)

A—闹牛山铜矿床;B—莲花山铜矿床、长春岭铅锌矿床;C—孟恩陶勒盖银铅矿床;D—石长温都尔铅锌银矿床;E—塔布勒吉铜矿床;F—老道沟铅锌银矿床;H—水泉沟铜铅矿床;I—油娄山铅锌银矿床。1—重磁推断断层;2—线形构造;3—环形构造;4—正相火山构造;5—负相火山构造;6—铜矿床;7—铅锌矿床;8—银铅矿床;9—铅锌银矿床

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