Origin and solidification age of Proterozoic Baidrag batholith, Tsagaan Tsahir Uul, Bayanhongor, central Mongolia

Sereenen, Jargalan; Fujimaki, Haruyuki

doi:10.2465/jmps.98.93

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…These are typical values for similar ore-bearing environments-although some caution is advised as this type of analysis may be equivocal (e.g., due to possible post-entrapment processes; Goldfarb and Groves 2015;Zhu et al 2011). Notably, numerous lamprophyre dikes (ultrapotassic mafic igneous intrusives) are found within the gold-bearing and copper-bearing zones (Jargalan et al 2007;Jargalan and Fujimaki 2000). Such dikes are known to be both spatially and temporally correlated with gold mineralization and deeply-connected, ore-forming fluid pathways (Groves et al 2018)-and are likely formed as a consequence of elevated fluid flow through the crust during subductionrelated metamorphism (Müller and Groves 2016; see also Goldfarb and Santosh 2014;Groves et al 2018), as is believed to have occurred in this region.…”

Section: Discussionmentioning

confidence: 94%

“…Throughout the Bayankhongor area there exists evidence of extensive hydrothermal alteration (Jargalan et al 2007;Buchan et al 2001;Watanabe et al 1999). Fluid inclusion analysis of gold-bearing quartz veins in the metal belt indicate an apparent fluid salinity of ~ 4 wt% NaCl and mineral deposition at temperatures ranging from 160 °C to 260 °C (Jargalan and Fujimaki 2000;Jargalan and Murao 1998). These are typical values for similar ore-bearing environments-although some caution is advised as this type of analysis may be equivocal (e.g., due to possible post-entrapment processes; Goldfarb and Groves 2015;Zhu et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…The shape and size is consistent with that reported by Comeau et al (2020a), based on 2-D modeling of a transect across the Gobi-Altai mountains. This feature lies beneath a mineralized zone at the eastern extension of the Bayankhongor Metal Belt, near the well-studied Tsagaan Tsahir Uul region that includes the Saran Uul gold-bearing copper porphyry deposit along the Tuin Gol (Jargalan et al 2007;Jargalan and Fujimaki 2000;Watanabe et al 1999). Geologically, this area is described as a Proterozoic metamorphic unit with adjacent granites (Jargalan et al 2007).…”

Section: Table 1 Details Of Each 3-d Inversion Modelmentioning

confidence: 92%

“…b The survey area in a regional context. c Distribution of recent seismicity (2012 to 2014; data from Dashdondog et al 2020) mostly to the Permian or late Palaeozoic (Jargalan et al 2007;Jargalan and Fujimaki 2000;Watanabe et al 1999). They may correspond temporally to melting or magmatic events after subduction when a high regional compressional stress was present, possibly a critical component, due to the collisional deformation of the Baydrag microcontinent (Watanabe et al 1999).…”

Section: Regional Backgroundmentioning

confidence: 99%

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Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)

Comeau

Becken

Kuvshinov

et al. 2021

Earth Planets Space

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Crustal architecture strongly influences the development and emplacement of mineral zones. In this study, we image the crustal structure beneath a metallogenic belt and its surroundings in the Bayankhongor area of central Mongolia. In this region, an ophiolite belt marks the location of an ancient suture zone, which is presently associated with a reactivated fault system. Nearby, metamorphic and volcanic belts host important mineralization zones and constitute a significant metallogenic belt that includes sources of copper and gold. However, the crustal structure of these features, and their relationships, are poorly studied. We analyze magnetotelluric data acquired across this region and generate three-dimensional electrical resistivity models of the crustal structure, which is found to be locally highly heterogeneous. Because the upper crust (< 25 km) is found to be generally highly resistive (> 1000 Ωm), low-resistivity (< 50 Ωm) features are conspicuous. Anomalous low-resistivity zones are congruent with the suture zone, and ophiolite belt, which is revealed to be a major crustal-scale feature. Furthermore, broadening low-resistivity zones located down-dip from the suture zone suggest that the narrow deformation zone observed at the surface transforms to a wide area in the deeper crust. Other low-resistivity anomalies are spatially associated with the surface expressions of known mineralization zones; thus, their links to deeper crustal structures are imaged. Considering the available evidence, we determine that, in both cases, the low resistivity can be explained by hydrothermal alteration along fossil fluid pathways. This illustrates the pivotal role that crustal fluids play in diverse geological processes, and highlights their inherent link in a unified system, which has implications for models of mineral genesis and emplacement. The results demonstrate that the crustal architecture—including the major crustal boundary—acts as a first‐order control on the location of the metallogenic belt.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Table 1 Details Of Each 3-d Inversion Modelmentioning

confidence: 92%

Section: Regional Backgroundmentioning

confidence: 99%

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Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)

Comeau

Becken

Kuvshinov

et al. 2021

Earth Planets Space

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How do metals escape from magmas to form porphyry-type ore deposits?

Vigneresse

Truche

Richard

2019

Ore Geology Reviews

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Petrologic characteristics and Rb-Sr age dating of lamprophyre dikes of Tsagaan Tsahir Uul gold deposit, Mongolia

Sereenen

Fujimaki

Ohba

2007

Journal of Mineralogical and Petrological Sciences

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Geochemical, mineralogical and geochronological investigations have been carried out on the lamprophyre dike in the Tsagaan Tsahir Uul gold deposit area, Bayankhongor, Central Mongolia. The lamprophyre is composed of olivine, amphibole, and clinopyroxene as phenocrysts with plagioclase, potassium feldspar, biotite, and amphibole as the groundmass. The amphibole is mostly pargasite; some grains are rich in titanium and constitute kaersutite. Pyroxene is slightly enriched in titanium. Although the olivine ranges from Fo 92.9 to Fo 84.6 , a distinct compositional variation between the core and rim in a single grain is lacking. Mineral assemblage and chemical characteristics are close to those of calc alkaline lamprophyres (CALs). An Al 2 O 3 versus TiO 2 tectonic discrimination diagram of the shoshonitic and potassic igneous rock shows that the Tsagaan Tsahir Uul lamprophyre might have originated within an intra plate tectonic setting. The high Ti content of the lamprophyre also suggests that the magma could have originated in an intra continental tectonic setting. Small but similar intrusions emplaced during the Permian period are spatially and temporally associated with the main gold and copper mineralization in the Bayankhongor metallogenic belt. The obtained age of the lamprophyre dike (248.61 ± 18.5 Ma) demonstrates that its intrusion was a contemporary event. This was the youngest plutonic body in the Tsagaan Tsahir Uul area, which is close in age to the gold bearing quartz veins. Although there is no direct genetic evidence associating the auriferous veins and the lamprophyre in the field, they occur together and possibly share a similar tectonic setting.

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Origin and solidification age of Proterozoic Baidrag batholith, Tsagaan Tsahir Uul, Bayanhongor, central Mongolia

Cited by 3 publications

References 23 publications

Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)

Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)

How do metals escape from magmas to form porphyry-type ore deposits?

Petrologic characteristics and Rb-Sr age dating of lamprophyre dikes of Tsagaan Tsahir Uul gold deposit, Mongolia

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