构造体系复合控矿规律

2025-04-07 05:26:43
推荐回答(1个)
回答1:

构造体系复合控矿规律主要表现为东西向构造带的构造形迹被新华夏构造体系的构造形迹复合,并控制蚀变带和矿化带的展布与储矿。

胶东西北部地区构造复合控矿表现为两个方面。首先是金矿空间分布规律受构造体系复合控制。就单个金矿床而言,严格受新华夏系构造形迹控制,如招平断裂带上由南至北分布有旧店、夏甸、姜家窑、大尹格庄、玲南、破头青矿段等金矿床;但就成矿区而言,它的展布方向是严格受东西向断裂带控制,由西至东分布有三山岛、焦家、望儿山、灵山沟、金翅岭、玲珑西山、大开头、九曲等大中型金矿,组成了东西向金矿带。而金矿床的产出主要定位于北东向断裂与东西向断裂复合部位。

另一构造复合类型表现为断裂力学性质的叠加,主要有以下两种情况:①先扭性后压扭性断裂。东西向构造带的走向北东40°-550的扭性断裂被新华夏构造体系走向北北东或北东的压扭性断裂叠加,使原来走向北东的扭性断裂的力学性质具压扭性,并控制矿床、矿体的形成与分布。例如,灵山沟-北截断裂带控制的北截金矿、灵山沟金矿和金华山-洼孙家断裂带控制的前孙家金矿、洼孙家金矿都处在这种力学性质的断裂上。②先压性后扭性断裂。东西向构造带被新华夏构造体系走向北东东扭性断裂叠加,使原先走向东西的压性断裂具先压性后扭性的力学性质,并由走向东西转向北东东。这种类型的断裂控制了本区走向北东东的蚀变矿化带的展布并储矿。例如,白石夼、高庄岭等金矿点就处在这种力学性质的断裂上。

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