Contrastive Study on Features of Ore-forming Rock Mass between Area A Porphyry Type and Area B Skarn Type in Ka'erqueka Copper Molybdenum Deposit in Qinghai Province
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摘要: 青海省卡尔却卡铜多金属矿兼有斑岩-矽卡岩-热液系列的成矿特征,分A、B、C 3个区.其中A区主要为斑岩型成矿,B区为矽卡岩型矿化.铜多金属矿体主要产于花岗闪长岩、似斑状黑云母二长花岗岩体与寒武—奥陶纪滩间山群接触部位的矽卡岩带及似斑状二长花岗岩的斑岩矿化带中.笔者通过成矿岩体的岩石矿物组合和岩石地球化学特征对比,认为卡尔却卡B区的似斑状二长花岗岩的矽卡岩化成矿作用为早期的加里东俯冲碰撞阶段的产物.卡尔却卡矿区A区似斑状二长花岗岩的斑岩成矿作用和B区的花岗闪长岩矽卡岩成矿作用均是印支期晚期晚三叠世的大规模俯冲碰撞造山阶段的产物,构成了一个典型的斑岩型矿床成矿系统,叠加在早期的加里东期成矿作用上,形成了较大型的铜钼矿床.Abstract: Ka'erqueka Cu deposit in Qinghai province has porphyry-skarn-hydrothermal metallogenic characteristics of the series. The orefield is divided into three areas as A, B and C, among which area A is mainly porphyry mineralization, area B is mineralization of skarn type. Copper polymetallic deposit primarily originated in the contact area between granodiorite and porphyritic monzonitic granite and Cambrian-Ordovician Tanjianshan Group, that is skarn ore belt and porphyry copper deposit. By comparison of mineral assemblage and petrological geochemical characteristics, the porphyritic monzonitic granite of Area B in Ka'erqueka deposit is a product of the early stage of Caledonian subduction collision. Both porphyry mineralization in porphyritic monzonitic granite of Area A and skarn mineralization in granodiorite of Area B are products of subduction collision orogenic stage in late Triassic Indo-Chinese epoch, that produced a typical porphyry deposit system, then superimposed on early mineralization in Caledonian period, and finally the larger copper molybdenum deposit was formed.
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Keywords:
- deposit type /
- petrological geochemistry /
- Ka'erqueka /
- Qimantage /
- Qinghai
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