Gold and porphyry cu–mo mineralization of the bumbat ore cluster and its relationship with the early paleozoic magmatism of the lake zone (Western mongolia)

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Gold and porphyry cu–mo mineralization of the bumbat ore cluster and its relationship with the early paleozoic magmatism of the lake zone (Western mongolia). / Borisenko, A. S.; Gas’kov, I. V.; Babich, V. V. et al.

In: Russian Geology and Geophysics, Vol. 62, No. 1, 8, 01.2021, p. 121-133.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{52094367f4134a23b3a9853cf2198b23,

title = "Gold and porphyry cu–mo mineralization of the bumbat ore cluster and its relationship with the early paleozoic magmatism of the lake zone (Western mongolia)",

abstract = "Geological, mineralogical, and geochemical studies of copper and gold mineralization in the Bumbat ore district of Mongolia have shown its association with igneous rocks of different ages formed under different geodynamic, geologic, and geochemical conditions. Copper ore occurrences (site 98 and Altan Gadas site) with an age of 518.0 ± 4.9 Ma have similar mineralogical and geochemical features and seem to be related to plagiogranite-porphyry stocks formed at the late island arc stage (524.5 Ma). The ores were deposited from weakly concentrated solutions with a low content of СО2 at 240–230 ºС under subsurface conditions. The association of mineralization with plagiogranites, its localization predominantly in veins, and its essentially copper composition, with high contents of Zn, Mn, Ba, and, in some samples, Ag and Bi, permit us to assign this mineralization to the vein quartz–sulfide type. Its commercial value has yet to be assessed. Gold mineralization of the Three Hills and Darvi sites formed later (455.9 ± 4.3 Ma), during the formation of the final granitoid phases at the accretion–collision stage (511–465 Ma). These sites are mineralized crushing zones composed of hydrothermally altered rocks of sericite–quartz composition with veinlet and disseminated (stockwork) sulfide mineralization and gold-bearing quartz veins. The content of gold in the ores varies from tenths to tens of ppm, and its fineness varies from 700 to 1000‰. The ores of both sites have high contents of Cu, Zn, Mn, Ba, and, in places, Mo. Mineralization formed from hydrothermal solutions with TDS = 9.5–12.0 wt.% NaCl eq. at medium temperatures (230–300 ºC) under subsurface conditions. The above specific features of gold mineralization are typical of the flank zones of porphyry Cu–(Mo) deposits.",

keywords = "Bumbat ore district, Copper mineralization, Gold mineralization, Magmatism, Mongolia",

author = "Borisenko, {A. S.} and Gas{\textquoteright}kov, {I. V.} and Babich, {V. V.} and Borovikov, {A. A.}",

year = "2021",

month = jan,

doi = "10.2113/RGG20194042",

language = "English",

volume = "62",

pages = "121--133",

journal = "Russian Geology and Geophysics",

issn = "1068-7971",

publisher = "Elsevier Science B.V.",

number = "1",

}

RIS

TY - JOUR

T1 - Gold and porphyry cu–mo mineralization of the bumbat ore cluster and its relationship with the early paleozoic magmatism of the lake zone (Western mongolia)

AU - Borisenko, A. S.

AU - Gas’kov, I. V.

AU - Babich, V. V.

AU - Borovikov, A. A.

PY - 2021/1

Y1 - 2021/1

N2 - Geological, mineralogical, and geochemical studies of copper and gold mineralization in the Bumbat ore district of Mongolia have shown its association with igneous rocks of different ages formed under different geodynamic, geologic, and geochemical conditions. Copper ore occurrences (site 98 and Altan Gadas site) with an age of 518.0 ± 4.9 Ma have similar mineralogical and geochemical features and seem to be related to plagiogranite-porphyry stocks formed at the late island arc stage (524.5 Ma). The ores were deposited from weakly concentrated solutions with a low content of СО2 at 240–230 ºС under subsurface conditions. The association of mineralization with plagiogranites, its localization predominantly in veins, and its essentially copper composition, with high contents of Zn, Mn, Ba, and, in some samples, Ag and Bi, permit us to assign this mineralization to the vein quartz–sulfide type. Its commercial value has yet to be assessed. Gold mineralization of the Three Hills and Darvi sites formed later (455.9 ± 4.3 Ma), during the formation of the final granitoid phases at the accretion–collision stage (511–465 Ma). These sites are mineralized crushing zones composed of hydrothermally altered rocks of sericite–quartz composition with veinlet and disseminated (stockwork) sulfide mineralization and gold-bearing quartz veins. The content of gold in the ores varies from tenths to tens of ppm, and its fineness varies from 700 to 1000‰. The ores of both sites have high contents of Cu, Zn, Mn, Ba, and, in places, Mo. Mineralization formed from hydrothermal solutions with TDS = 9.5–12.0 wt.% NaCl eq. at medium temperatures (230–300 ºC) under subsurface conditions. The above specific features of gold mineralization are typical of the flank zones of porphyry Cu–(Mo) deposits.

AB - Geological, mineralogical, and geochemical studies of copper and gold mineralization in the Bumbat ore district of Mongolia have shown its association with igneous rocks of different ages formed under different geodynamic, geologic, and geochemical conditions. Copper ore occurrences (site 98 and Altan Gadas site) with an age of 518.0 ± 4.9 Ma have similar mineralogical and geochemical features and seem to be related to plagiogranite-porphyry stocks formed at the late island arc stage (524.5 Ma). The ores were deposited from weakly concentrated solutions with a low content of СО2 at 240–230 ºС under subsurface conditions. The association of mineralization with plagiogranites, its localization predominantly in veins, and its essentially copper composition, with high contents of Zn, Mn, Ba, and, in some samples, Ag and Bi, permit us to assign this mineralization to the vein quartz–sulfide type. Its commercial value has yet to be assessed. Gold mineralization of the Three Hills and Darvi sites formed later (455.9 ± 4.3 Ma), during the formation of the final granitoid phases at the accretion–collision stage (511–465 Ma). These sites are mineralized crushing zones composed of hydrothermally altered rocks of sericite–quartz composition with veinlet and disseminated (stockwork) sulfide mineralization and gold-bearing quartz veins. The content of gold in the ores varies from tenths to tens of ppm, and its fineness varies from 700 to 1000‰. The ores of both sites have high contents of Cu, Zn, Mn, Ba, and, in places, Mo. Mineralization formed from hydrothermal solutions with TDS = 9.5–12.0 wt.% NaCl eq. at medium temperatures (230–300 ºC) under subsurface conditions. The above specific features of gold mineralization are typical of the flank zones of porphyry Cu–(Mo) deposits.

KW - Bumbat ore district

KW - Copper mineralization

KW - Gold mineralization

KW - Magmatism

KW - Mongolia

UR - http://www.scopus.com/inward/record.url?scp=85106283299&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=46075192

U2 - 10.2113/RGG20194042

DO - 10.2113/RGG20194042

M3 - Article

AN - SCOPUS:85106283299

VL - 62

SP - 121

EP - 133

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 1

M1 - 8

ER -

ID: 29127705