Abstract The Sungun copper–molybdenum porphyry deposit is located in the north of Varzaghan, northwestern Iran. The Sungun quartz-monzonite is the oldest mineralized intrusive body in the region and was emplaced during the Early Miocene. Eight categories of the late and unmineralized dykes, which include quartz diorite, gabbrodiorite, diorite, dacite, microdiorite and lamprophyre (LAM), intrude the ore deposit. The main mineral phases in the dykes include plagioclase, amphibole and biotite, with minor quartz and apatite and secondary chlorite, epidote, muscovite and sericite. The composition of plagioclase in the quartz diorite dykes (DK1a, DK1b and DK1c) varies from albite-oligoclase to andesine and oligoclase to andesine; in the diorite, it varies from andesine to labradorite; in the LAM, from albite to oligoclase; and in the microdiorite (MDI), it occurs as albite. Amphibole compositions are consistent with classification as hornblende or calcic amphibole. Based on their AlIV value (less than 1.5), amphibole compositions are consistent with an active continental margin affinity. The average percentage of pistacite (P s) in epidotes formed from alteration of plagioclase and ferromagnesian minerals is 27–23% and 25–30%, respectively. Thermobarometric studies based on amphibole and biotite indicate approximate dyke crystallization temperature of 850–750℃, pressure of 231–336 MPa and high fO2 (>nickel-nickel-oxide buffer). The range of mineral compositions in the postmineralization dyke suite is consistent with a genetic relationship with the subduction of the Neotethys oceanic crust beneath the continental crust of the northwest part of the Central Iranian Structural Zone. Despite the change from calc-alkaline to alkaline magmatism, the dykes are likely related to the late stages of magmatic activity in the subduction system that also generated the porphyry deposit.

中文翻译：

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Sungun Cu-Mo 斑岩矿床（伊朗西北部）矿化后岩脉的矿物学、矿物化学和温度测量

摘要 Sungun铜钼斑岩矿床位于伊朗西北部瓦尔扎甘北部。Sungun 石英二长岩是该地区最古老的矿化侵入体，并在早中新世期间就位。8类晚期未矿化岩脉侵入矿床，包括石英闪长岩、辉长闪长岩、闪长岩、英安岩、微闪长岩和菱镁矿（LAM）。岩脉中的主要矿物相包括斜长石、角闪石和黑云母，少量石英和磷灰石以及次生绿泥石、绿帘石、白云母和绢云母。石英闪长岩脉（DK1a、DK1b 和 DK1c）中斜长石的组成从钠长石-长石到中长石和长石到中长石不等；在闪长岩中，从中长石到拉长石不等；在 LAM 中，从钠长石到寡长石；在微闪长岩 (MDI) 中，它以钠长石形式出现。角闪石成分与角闪石或钙闪石的分类一致。根据它们的 AlIV 值（小于 1.5），角闪石成分与活动大陆边缘的亲和力一致。斜长石和铁镁矿物蚀变形成的绿帘石中绿铁矿 (P s) 的平均百分比分别为 27-23% 和 25-30%。基于角闪石和黑云母的热气压研究表明，岩脉结晶温度约为 850-750℃，压力为 231-336 MPa，fO2 较高（> 镍-镍-氧化物缓冲液）。后矿化岩脉中的矿物成分范围与伊朗中部构造带西北部大陆地壳下新特提斯洋壳俯冲的成因关系一致。