Gold mineralisations in the Canan area, Lepaguare District, east-central Honduras: Fluid inclusions and geochemical constraints on gold deposition

Salvioli-Mariani, Emma; Toscani, Lorenzo; Boschetti, Tiziano; Bersani, Danilo; Mattioli, Michele

doi:10.1016/j.gexplo.2015.08.003

Cited by 5 publications

(1 citation statement)

References 70 publications

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“…This intrusion is responsible for most of the metallogenic mineralizations within the Cacaguapa Shists (Figure 1). As described by [11][12][13]26], the Canan Lode gold deposit is associated with quartz-veined shear zones, and the mineralization occurs in the low-to medium-grade pre-Mesozoic metamorphic basement (graphitic and sericitic schists). Quartz veins were formed by hydrothermal fluids (associated with the emplacement of Cretaceous-Tertiary granodioritic intrusions) that altered the wall-rocks.…”

Section: Geological Background and Description Of The Murcielago Gold...mentioning

confidence: 99%

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Nazzareni,

Alunno,

Zaccarini

et al. 2023

Geosciences

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The Murcielago gold placer is located in the Lepaguare Valley, Olancho Department (Central Honduras). The placer mineralogy includes silicates (quartz, garnets, amphibole, Ca-pyroxene, micas, epidote, and tourmaline); calcite; and in the heavy fraction, zircon, ilmenite–rutile, magnetite, hematite, cassiterite, and cinnabar. Gold grains recovered from the Murcielago placer production plant are mainly flattened grains with a moderately to high elliptical shape. The composition of the gold grains varies continuously in the range Au46Ag54 to Au88Ag12. Few of them are characterized by Au-rich rims of a few microns in size (Ag 3-1 atoms percent (at%)). Gold from the Canan lode deposit, a nearby hydrothermal Au mineralization area, has a composition (from Au54Ag44 to Au81Ag19) overlapping the composition of the Murcielago grains. Inclusions in the alluvial gold particles are arsenopyrite, pyrite, acanthite, sphalerite, and hematite. On the basis of the placer mineralogy and the gold grains analyses, possible gold source(s) include the Canan lode and skarn gold deposits in the area. We obtained new data on the Murcielago gold placer that will be the basis for an exploration of the potential sources of gold in the area.

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Section: Geological Background and Description Of The Murcielago Gold...mentioning

confidence: 99%

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Nazzareni,

Alunno,

Zaccarini

et al. 2023

Geosciences

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Physicochemical parameters and age of the Vasil’kovskoe gold deposit (northern Kazakhstan)

Khomenko

Гибшер

Томиленко

et al. 2016

Russian Geology and Geophysics

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A superlarge gold-ore stockwork of the Vasil’kovskoe deposit (with gold resources of more than 380 tons) is located at the contact of porphyroblastic granodiorites and diorites in northern Kazakhstan. The specifics of the Vasil’kovskoe deposit is a wide occurrence of gray (so-called ore) gold-bearing quartz, which, together with white quartz, composes quartz–sulfide veins and veinlets in the stockwork. Based on thermobarogeochemical and isotope-geochemical data, we have established that gray quartz and arsenopyrite of the deposit formed with the participation of K–Na–Mg–Cl-containing aqueous CO2–hydrocarbon fluids at 250–550 ºC, 0.1–2.5 kbar, and salinity of 7.0–22.5 wt.% NaCl equiv. (seldom, >30–40 wt.% NaCl equiv.). The cyclic recurrence of parameter fluctuations was accompanied by the deposition of gold, which led to the formation of gold-rich veinlet ores in the stockwork core. White quartz formed at lower temperatures, 120–310 ºC, and 0.2–1.0 kbar, with the participation of Ca–Na–Cl-containing fluids with salinity of 2.0–11.0 wt.% NaCl equiv. In addition to H2O and CO2, hydrocarbons and their derivates (paraffins, olefins, arenes, alcohols, ethers, aldehydes, ketones, and carboxylic acids) as well as nitrogen-containing (C2H3N, C3H9N, C7H5N, and C8H5NO2) and sulfur-containing (CS2, COS, SO2, C2H6S2, etc.) compounds (indicators of reducing conditions) were involved in the ore formation. The sulfur isotope composition of sulfides (δ34S = +5.7 to + 11.8‰) and the carbon isotope composition of CO2 in fluid inclusions in gray (δ13C = –2.1 to –4.6‰) and white (δ13C = –11.0 to –21.4‰) quartz as well as its positive and negative anomalies of Eu point to the crustal source of the fluids. The gray color of quartz is due to abundant CO2–hydrocarbon-containing inclusions, carbon particles, and sulfides. Crystallization of ore-hosting granodiorites happened in the period from 490.0 ± 4.4 to 443.5 ± 4.1 Ma. The age of the areal K-feldspathization of granodiorites, preceding the ore formation, is 375.2 ± 3.7 Ma. Formation of gold-including parageneses took place in the period from 311.7 ± 6.4 to 279.2 ± 2.5 Ma, i.e., lasted no less than 30 Myr.

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Physicochemical Parameters and Geochemical Features of Fluids at Mesozoic Gold Deposits

Prokofiev¹,

Наумов²,

Mironova³

2020

Geochem. Int.

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Gold mineralisations in the Canan area, Lepaguare District, east-central Honduras: Fluid inclusions and geochemical constraints on gold deposition

Cited by 5 publications

References 70 publications

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Physicochemical parameters and age of the Vasil’kovskoe gold deposit (northern Kazakhstan)

Physicochemical Parameters and Geochemical Features of Fluids at Mesozoic Gold Deposits

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