Mafic-ultramafic subvolcanic intrusive complexes, at the 1–10-km scale, constitute favorable environments for the formation of orthomagmatic Ni-Cu-PGE sulfide deposits. Within 100–1000-km scale large igneous provinces (LIPs), the most favorable economic target areas may be difficult to identify using a traditional regional exploration approach. We report results of field and laboratory studies focused on an integrated geochemical-architectural model for the Ni-Cu-PGE sulfide potential of the High Arctic large igneous province (HALIP) of Canada, the largest and best-exposed portion of this circum-arctic LIP. Previous lithogeochemical studies of the Canadian HALIP (130–80 Ma) concluded that subalkaline mafic units located on Axel Heiberg Island were more prospective than younger, alkalic igneous rocks (alkaline basalts to basanites) exposed on northern Ellesmere Island. Mapping carried out for this study revealed the presence of abundant subalkaline igneous rocks on western Ellesmere Island. We interpret these units as an extension of the Schei Sills, a stratigraphically bound sequence of intrusions exposed along a ~ N-S belt on eastern Axel Heiberg Island. Samples from the Schei Sills and from the Middle Fiord Intrusive Complex (~ 20 km², central Axel Heiberg Island) show Cu/Zr values above and below unity, consistent with complementary sulfide enrichment and removal, respectively, within these intrusive systems. The spatial association of the Schei Sills with the post-emplacement Eocene Stolz Thrust is noteworthy, as later thrusting associated with the Paleogene Eurekan Orogeny caused the uplift of deeper parts of the HALIP subvolcanic feeder system and associated wall-rock stratigraphy. Absolute Ir-group PGE contents are low throughout the HALIP; however, Pt-group PGE contents range widely among analyzed tholeiitic intrusive rocks. For example, relatively elevated Pt + Pd values of 10–30 ppb in samples from the Middle Fiord Intrusive Complex and the Schei Sills suggest heightened prospectivity in these two areas. In contrast, tholeiitic flood basalts in the Strand Fiord Formation and associated intrusions exposed in western Axel Heiberg Island (~ 95 Ma) exhibit Cu/Zr < 1 and low Pt + Pd contents (below 10 ppb). The ca. 120 Ma magmatic event associated with the Schei Sills and Middle Fiord Intrusive Complex appears to have generated magmas that are more prospective than those of the younger (ca. 95 Ma) magmatic pulse associated with the flood basalts of the Strand Fiord Formation. This work demonstrates that not all architectural elements of a LIP are equal in terms of metallogenic potential, and that nested zones of higher prospectivity can be identified through the integration of several geological constraints.

1–10 km规模的镁铁质-超镁铁质次火山侵入复合体为形成正岩浆型镍-铜-PGE硫化物矿床提供了有利的环境。在100-1000公里规模的大火成岩省（LIP）中，使用传统的区域勘探方法可能难以确定最有利的经济目标区域。我们报告了针对加拿大高北极大火成岩省（HALIP）的镍-铜-PGE硫化物潜力的综合地球化学-建筑模型的现场和实验室研究结果，这是该环北极最大和暴露最好的部分唇。先前对加拿大HALIP（130-80 Ma）的岩石地球化学研究得出的结论是，位于Axel Heiberg岛上的亚碱性镁铁质单元比年轻的更具前景，在埃尔斯米尔岛北部暴露的碱性火成岩（碱性玄武岩到玄武岩）。为这项研究进行的测绘表明，在Ellesmere岛西部存在大量的亚碱性火成岩。我们将这些单元解释为Schei Sills的延伸，Schei Sills是沿地层约束的一系列侵入，沿着东部Axel Heiberg岛的〜NS带暴露。Schei门槛和中峡湾侵入性综合体（〜20 km^2个（中部Axel Heiberg岛）显示出Cu / Zr值高于和低于1，分别与这些侵入系统中的互补硫化物富集和去除有关。Schei窗台与进位后始新世Stolz推力的空间联系是值得注意的，因为后来与古近纪Eurekan造山运动有关的冲动引起了HALIP火山下支线系统的深部隆起和相关的岩壁地层。在整个HALIP中，铱族PGE的绝对含量低；然而，在分析的侵入性侵入岩中，铂族PGE的含量范围很广。例如，来自中峡湾地区侵入岩群和Schei Sills的样品中Pt + Pd值相对较高，为10–30 ppb，这表明这两个地区的前景较高。相比之下，Strand Fiord地层中的高致洪性玄武岩以及在Axel Heiberg岛西部（〜95 Ma）暴露的相关侵入岩表现出Cu / Zr <1和低Pt + Pd含量（低于10 ppb）。的ca。与席尔门槛和中峡湾侵入复合体有关的120 Ma岩浆事件似乎产生的岩浆比与Strand Fiord组洪水玄武岩有关的年轻（约95 Ma）岩浆脉冲的岩浆更具前景。这项工作表明，LIP的并不是所有的建筑元素在成矿潜力方面都是平等的，并且可以通过整合多个地质约束条件来确定具有较高远景性的嵌套区域。与席尔门槛和中峡湾侵入复合体有关的120 Ma岩浆事件似乎产生的岩浆比与Strand Fiord组洪水玄武岩有关的年轻（约95 Ma）岩浆脉冲的岩浆更具前景。这项工作表明，LIP的并不是所有的建筑元素在成矿潜力方面都是平等的，并且可以通过整合多个地质约束条件来确定具有较高远景性的嵌套区域。与席尔门槛和中峡湾侵入复合体有关的120 Ma岩浆事件似乎产生的岩浆比与Strand Fiord组洪水玄武岩有关的年轻（约95 Ma）岩浆脉冲的岩浆更具前景。这项工作表明，LIP的并不是所有的建筑元素在成矿潜力方面都是平等的，并且可以通过整合多个地质约束条件来确定具有较高远景性的嵌套区域。