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<p>Structural and geochronological studies of the San Albino orogenic gold deposit, NW Nicaragua within a micro- to macroscopic framework can constrain mechanisms of deposit formation and the overarching tectonic context. High-grade, gold-bearing vein sets formed during three stages of hydrothermal activity: early shear vein emplacement (stage 1), episodic reactivation and progressive deposition of sulfides with minor gold (stage 2), and localized recrystallization with precipitation of galena and most free gold (stage 3). Subvertical dikes cut the ore zones and are themselves cut by younger faults. Thus, the age of these dikes places an absolute timing constraint on earlier mineralization and later events. Zircon dating of the dikes by U-Pb LA-ICP-MS yields an emplacement age of ~ 96&#xa0;Ma and provides a minimum mineralization age. Based on this and current understanding of the regional geology, mineralization occurred between ~ 115 and 96&#xa0;Ma, being triggered by large-scale tectonic reconfigurations associated with formation of the Caribbean plate. Post-mineral structural overprint includes a Laramide (~ 70–55&#xa0;Ma) shortening event and extensional to transtensional activity since the mid-Tertiary.</p>

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Genesis and structural evolution of the San Albino orogenic gold deposit, NW Nicaragua with implications for Mesozoic tectonic and metallogenic processes in Central America

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Ben M. Frieman,
  • Bradley L. Squires,
  • Thomas Monecke,
  • Richard J. Goldfarb,
  • Joseph E. Andrew,
  • Simon Kocher

摘要

Structural and geochronological studies of the San Albino orogenic gold deposit, NW Nicaragua within a micro- to macroscopic framework can constrain mechanisms of deposit formation and the overarching tectonic context. High-grade, gold-bearing vein sets formed during three stages of hydrothermal activity: early shear vein emplacement (stage 1), episodic reactivation and progressive deposition of sulfides with minor gold (stage 2), and localized recrystallization with precipitation of galena and most free gold (stage 3). Subvertical dikes cut the ore zones and are themselves cut by younger faults. Thus, the age of these dikes places an absolute timing constraint on earlier mineralization and later events. Zircon dating of the dikes by U-Pb LA-ICP-MS yields an emplacement age of ~ 96 Ma and provides a minimum mineralization age. Based on this and current understanding of the regional geology, mineralization occurred between ~ 115 and 96 Ma, being triggered by large-scale tectonic reconfigurations associated with formation of the Caribbean plate. Post-mineral structural overprint includes a Laramide (~ 70–55 Ma) shortening event and extensional to transtensional activity since the mid-Tertiary.