相山、银山、紫金山次英安玢岩的比较研究

相山、银山、紫金山矿田（床）的次英安玢岩虽然出露形态不尽相同，但都是火山岩浆旋回晚期的产物，CA＞56，δ＜3．3，稀土配分曲线较相似，具有地幔组分和地壳组分高度混合的源区特征，反映它们都是与斑岩铜矿有关的钙碱性次火山岩。根据银山、紫金山矿（床）田的矿化分带和相山矿田剥蚀不深的事实，推测相山矿田或火山机构中心地带的深部，有大规模Cu多金属矿化分布。

CONTRASTS OF THE SUB-DACITIC PORPHYRY IN XIANGSHAN, YINSHAN AND ZIJINGSHAN OREFIELDS

The sub-dacitic porphyries controlled by volcanic organs in Xiangshan, Yinshan and Zijingshan orefields are the products of late volcanic magma cycle. Although their outcrop configurations are different, the sub-dacitic porphyries are all calcium-alkalescence sub-volcanic rocks related to porphyry copper ores with CA>56, <3.3, REE partition curves being semblable, and origin area having double characteristics of both mantle components and crust components. According to the facts of mineralized zoning in Yinshan and Zijingshan orefields and slight denudation in Xiangshan orefield, it is speculated that large-scale copper-polymetallic mineralization may exist in the deep of Xiangshan volcanic organ's heartland.