Abstract At the Gibraltar porphyry Cu-Mo deposit in south-central British Columbia, Canada, geochemical and mineralogical anomalies in till around a cluster of mineral occurrences form amoeboid-shaped dispersal patterns controlled by three phases of ice movement. The glacial dispersal patterns defined by elevated concentrations of ore (Cu, Mo) and pathfinder (Ag, Zn) elements and alteration oxides (Al2O3, K2O) in the till matrix (clay and silt plus clay fractions) extend over areas of 6–36 km2 and are centered on the main economic mineralization. Mineralogical dispersal trains were identified by the high abundances of chalcopyrite, pyrite, jarosite, titanite, and epidote, which were derived from the mineralization and its associated oxidation and alteration zones. These mineralogical anomalies in till extend approximately 30 km2 for chalcopyrite, 62 km2 for jarosite, and up to 136 km2 for epidote. Epidote grains in till with a trace element composition of >10 ppm As, >4 ppm Sb, <200 ppm total rare earth elements (ΣREEs), <45 ppm Y, <100 ppm Sc + Cr + Y, and/or <2 ppm Th + Hf are interpreted as being either principally derived from the intrusive rocks or from hydrothermal alteration of the porphyry mineralization. Rare epidote grains with >30 ppm Cu, interpreted to be related to the porphyry Cu mineralization, were detected in till up to 7 km down-ice from the economic mineralization. This study demonstrates that till geochemistry and mineralogy, combined with geochemical analyses of specific minerals such as epidote, are efficient methods for identifying porphyry Cu mineralization in terrains covered by glacial sediments.

中文翻译：

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检测冰川景观中埋藏的斑岩铜矿化：以加拿大不列颠哥伦比亚省直布罗陀铜钼矿床为例

摘要 在加拿大不列颠哥伦比亚省中南部的直布罗陀斑岩铜钼矿床中，直到围绕矿点群的地球化学和矿物学异常形成受冰运动三个阶段控制的变形虫状扩散模式。由矿石（Cu，Mo）和探路者（Ag，Zn）元素和蚀变氧化物（Al2O3，K2O）在耕作基质（粘土和淤泥加粘土部分）中浓度升高定义的冰川扩散模式延伸到6-36的区域平方公里，以主要经济矿化为中心。通过高丰度的黄铜矿、黄铁矿、黄钾铁矾、榍石和绿帘石确定矿物学分散序列，这些矿物来源于矿化及其相关的氧化和蚀变带。这些矿物学异常的范围为黄铜矿约 30 平方公里，黄钾铁矾为 62 平方公里，绿帘石高达 136 平方公里。绿帘石晶粒的微量元素组成为>10 ppm As、>4 ppm Sb、<200 ppm 总稀土元素 (ΣREE)、<45 ppm Y、<100 ppm Sc + Cr + Y，和/或＜2 ppm Th + Hf 被解释为主要来源于侵入岩或斑岩矿化的热液蚀变。在距经济矿化区长达 7 公里的下冰层中发现了具有＞30 ppm 铜的稀有绿帘石颗粒，被解释为与斑岩铜矿化有关。这项研究表明，直到地球化学和矿物学，结合特定矿物（如绿帘石）的地球化学分析，