Archean Appinites from the Northern Complex, Michigan

Wilkin, Richard T.; Bornhorst, Theodore J.

doi:10.1086/648199

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…All considered occurrences, spanning examples from the Neoarchean to the present, are genetically or at least spatially associated with gold-rich mineral systems, and overlap the K 2 O and MgO vs. SiO 2 composition of the Pataz rocks. (Figures 12A, B; data sources: Ovejas batholith; Duque-Trujillo et al, 2019;Creixell et al, 2009;Graham et al, 2017;Absaroka Range;Iddings, 1895;Feeley, 2003;King River;Feldstein and Lange, 1999;Cripple Creek;Kelley et al, 1998;Mascota;Ownby et al, 2008;Ecuador;Chiaradia et al, 2014;Santos and Oliveiri, 2016;Wilkin and Bornhorst, 1993;Ach'Uaine;Fowler and Henney, 1996;Lobach-Zhuchenko et al, 2008;Larionova et al, 2007;Leslie et al, 2009;Damavand volcano;Liotard et al, 2008;Murphy et al, 2019). Indeed, most of the compiled absarokite-appinite rocks are interpreted (by respective authors) to have been derived from upper mantle that was pre-enriched (i.e., pre-metasomatized) at the time of magma genesis/re-mobilization.…”

Section: Inheritance Of Pre-fertilized Mantle Source Reservoirsmentioning

confidence: 99%

Cryptic trans-lithospheric fault systems at the western margin of South America: implications for the formation and localization of gold-rich deposit superclusters

Wiemer,

Hagemann,

Hayward

et al. 2023

Front. Earth Sci.

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We present a review of frontier research advances in the investigation of cryptic structures that transect the South American Andes at oblique strike directions. The intersections between these cryptic structures and the superimposed Andean belt correlate with the spatial distribution of gold-rich mineral deposit clusters. The deposit clusters can be described as superclusters, as they comprise various gold deposit types that formed at multiple times throughout the Phanerozoic, impinging repeatedly on the structural intersections. However, the cryptic inherited fault structures are difficult to detect, because their deeper-seated roots are often overlain by younger supracrustal successions, and/or their exposed surface manifestations are structurally obscured by subsequent tectonic-magmatic activity. Thus, it also remains a challenge to constrain the nature and timing of formation, and the respective subsequent evolutionary path, of these proposed pre-Andean structures. Based on various case studies, we demonstrate that the localization of identified Phanerozoic gold deposit superclusters along the western South American margin is fundamentally controlled by structural inheritance often dating back to at least the Mesoproterozoic. Integration of multi-approach observations and datasets allows insights into a larger-scale tectonic history that showcases the successive inheritance of major structures originating from the Amazonian Craton, over the Paleozoic Gondwana margin, into the Cenozoic magmatic belts of the Andes, and even into recent fractures within the subducting oceanic Nazca plate, recording >1.2-billion-years of progressive structural inheritance and growth at one of the longest-lived tectonic margins in Earth history. In contrast to previous models of the spatial distribution of gold deposits, based on statistical approaches and spatial periodicity in self-organized systems focusing on single subduction and/or accretion episodes and belts, we propose that the structural inheritance and intersections are key to the localization of gold deposits in the Andes. In combination with bulk-geochemical data from magmatic rocks, we suggest that inherited structures maintained a trans-lithospheric connectivity to pre-fertilized gold enriched upper mantle reservoirs, which were tapped during multiple tectono-magmatic reactivation episodes.

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Section: Inheritance Of Pre-fertilized Mantle Source Reservoirsmentioning

confidence: 99%

Cryptic trans-lithospheric fault systems at the western margin of South America: implications for the formation and localization of gold-rich deposit superclusters

Wiemer,

Hagemann,

Hayward

et al. 2023

Front. Earth Sci.

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“…Atherton and Ghani, 2002;Castro et al, 2003;Fowler, 1988). Their distinctive geochemistry has led to hypotheses postulating genetic relationships with high-Mg basalts (Tiepolo et al, 2011), shoshonitic lamprophyres (Rock, 1990), adakites (Ye et al, 2008), and sanukitoid and tonalite-trondhjemite-granodiorite (TTG) suites (Wilkin and Bornhorst, 1993).…”

Section: Introductionmentioning

confidence: 99%