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小寺沟岩浆活动主要发生在燕山运动晚期。三次岩浆侵入,形成了下杖子二长斑岩、上杖子花岗闪长斑岩和晚期脉岩(主要是闪长玢岩、花岗斑岩)。这三种岩石都含有引人注目的钾长石巨斑。在含钼(铜)矿化的花岗闪长斑岩体中,这种巨斑普遍发育,但展布很不均匀,一般聚集于岩体的顶部、边部。为了弄清这种钾长石巨斑的特征以及与成岩成矿的关系,笔者作了如下工作:
Xiaosigou magmatism mainly occurred in late Yanshan movement. After three magmatic intrusions, Xiazhangzi-bioporphyrite, Shangzizi granodiorite porphyrite and late veins (mainly diorite porphyrite and granite porphyry) were formed. All three rocks contain the remarkable potassium feldspar macula. In the molybdenum (copper) mineralized granodiorite porphyry body, this macular widespread, but the distribution is very uneven, generally gathered in the top of the rock, the edge. In order to understand the characteristics of this K-feldspar macula and the relationship with diagenesis and mineralization, the author made the following work: