ABSTRACT The Hauraki Goldfield of the Coromandel Volcanic Zone (CVZ) hosts up to 50 adularia-sericite epithermal Au-Ag deposits that young towards the southeast and align within NNE-to-NE trending structural corridors. We jointly interpret regional aeromagnetic data and a compilation of available geological data to identify structures that have influenced mineralisation. Systematic processing of aeromagnetic data and ‘worming’ edge detection provides a means of linking deep-seated aeromagnetic patterns with surface geology. The > 80 km long NNW-trending Whangamata-Coromandel lineament that persists to > 3 km depth and the NW-SE-trending Martha-Thames lineament are spatially linked to zones of hydrothermal alteration and epithermal deposits. Similar correlations are seen with deeply sourced NNE-trending lineaments contiguous with shallow sourced anomalies here interpreted as fault-angle basins. Our results are consistent with a model in which inherited basement fabrics appear to have influenced the late Miocene-to-Present tectonic segmentation of the CVZ, with implications for the localisation of epithermal mineralisation.

中文翻译：

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新西兰科罗曼德火山带 Hauraki Goldfield 内超热液矿床的区域地壳尺度结构控制：综合地质和航磁结构模式的洞察

摘要 科罗曼德火山区 (CVZ) 的 Hauraki 金矿区拥有多达 50 个阿杜拉-绢云母浅成热液 Au-Ag 矿床，这些矿床向东南年轻，并在 NNE 到 NE 走向的构造走廊内排列。我们联合解释区域航磁数据和可用地质数据的汇编，以确定影响矿化的结构。航磁数据的系统处理和“蠕动”边缘检测提供了一种将深层航磁模式与地表地质联系起来的方法。超过 80 公里长的 NNW 走向的 Whangamata-Coromandel 沿线深度超过 3 公里，而 NW-SE 走向的 Martha-Thames 沿线在空间上与热液蚀变区和低温热液沉积区相连。类似的相关性在深源 NNE 向线状体与浅源异常相邻的情况下也可以看到，这里被解释为断层角盆地。我们的结果与一个模型一致，在该模型中，继承的基底结构似乎影响了 CVZ 的晚中新世至今的构造分割，对超热液矿化的定位有影响。