Evidence for Multistage and Polychronous Alkaline–Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield)

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Evidence for Multistage and Polychronous Alkaline–Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield). / Malkovets, V. G.; Shatsky, V. S.; Dak, A. I. et al.

In: Doklady Earth Sciences, Vol. 496, No. 1, 01.2021, p. 48-52.

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

BibTeX

@article{6024ff43cd604494907935ba78aa401a,

title = "Evidence for Multistage and Polychronous Alkaline–Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield)",

abstract = "New mineralogical and isotope–geochemical data for zircon megacrysts (n = 48) from alluvium of Kholomolokh Creek (a tributary of the Ebelakh River) are reported. Using the geochemical classification schemes, the presence of zircons of kimberlitic and carbonatitic genesis was shown. The U–Pb dating of zircons revealed two major age populations: the Triassic (258–221 Ma, n = 18) and Jurassic (192–154 Ma, n = 30). Weighted mean 206Pb/238U ages allowed us to distinguish the following age stages: 155 ± 3, 161 ± 2, 177 ± 1.5, 183 ± 1.5, 190 ± 2, 233 ± 2.5, and 252 ± 4 Ma. It is suggested that the Ebelyakh diamonds could have been transported from the mantle depths by kimberlite, as well as by other related rocks, such as carbonatite, lamprophyre, lamproite, olivine melilitite, etc. Diamonds from the Ebelyakh placers most likely have polygenic native sources and may be associated with polychronous and multistage Middle Paleozoic and Mesozoic kimberlite and alkaline–ultrabasic magmatism in the eastern slope of the Anabar Shield (the Ebelyakh, Mayat, and Billyakh river basins).",

keywords = "diamond, Ebelyakh placers, Kholomolokh, Siberian Craton, U–Pb dating, zircon",

author = "Malkovets, {V. G.} and Shatsky, {V. S.} and Dak, {A. I.} and Gibsher, {A. A.} and Yakovlev, {I. V.} and Belousova, {E. A.} and T. Tsujimori and Sobolev, {N. V.}",

year = "2021",

month = jan,

doi = "10.1134/S1028334X21010141",

language = "English",

volume = "496",

pages = "48--52",

journal = "Doklady Earth Sciences",

issn = "1028-334X",

publisher = "PLEIADES PUBLISHING INC",

number = "1",

}

RIS

TY - JOUR

T1 - Evidence for Multistage and Polychronous Alkaline–Ultrabasic Mesozoic Magmatism in the Area of Diamondiferous Placers of the Ebelyakh River Basin (Eastern Slope of the Anabar Shield)

AU - Malkovets, V. G.

AU - Shatsky, V. S.

AU - Dak, A. I.

AU - Gibsher, A. A.

AU - Yakovlev, I. V.

AU - Belousova, E. A.

AU - Tsujimori, T.

AU - Sobolev, N. V.

PY - 2021/1

Y1 - 2021/1

N2 - New mineralogical and isotope–geochemical data for zircon megacrysts (n = 48) from alluvium of Kholomolokh Creek (a tributary of the Ebelakh River) are reported. Using the geochemical classification schemes, the presence of zircons of kimberlitic and carbonatitic genesis was shown. The U–Pb dating of zircons revealed two major age populations: the Triassic (258–221 Ma, n = 18) and Jurassic (192–154 Ma, n = 30). Weighted mean 206Pb/238U ages allowed us to distinguish the following age stages: 155 ± 3, 161 ± 2, 177 ± 1.5, 183 ± 1.5, 190 ± 2, 233 ± 2.5, and 252 ± 4 Ma. It is suggested that the Ebelyakh diamonds could have been transported from the mantle depths by kimberlite, as well as by other related rocks, such as carbonatite, lamprophyre, lamproite, olivine melilitite, etc. Diamonds from the Ebelyakh placers most likely have polygenic native sources and may be associated with polychronous and multistage Middle Paleozoic and Mesozoic kimberlite and alkaline–ultrabasic magmatism in the eastern slope of the Anabar Shield (the Ebelyakh, Mayat, and Billyakh river basins).

AB - New mineralogical and isotope–geochemical data for zircon megacrysts (n = 48) from alluvium of Kholomolokh Creek (a tributary of the Ebelakh River) are reported. Using the geochemical classification schemes, the presence of zircons of kimberlitic and carbonatitic genesis was shown. The U–Pb dating of zircons revealed two major age populations: the Triassic (258–221 Ma, n = 18) and Jurassic (192–154 Ma, n = 30). Weighted mean 206Pb/238U ages allowed us to distinguish the following age stages: 155 ± 3, 161 ± 2, 177 ± 1.5, 183 ± 1.5, 190 ± 2, 233 ± 2.5, and 252 ± 4 Ma. It is suggested that the Ebelyakh diamonds could have been transported from the mantle depths by kimberlite, as well as by other related rocks, such as carbonatite, lamprophyre, lamproite, olivine melilitite, etc. Diamonds from the Ebelyakh placers most likely have polygenic native sources and may be associated with polychronous and multistage Middle Paleozoic and Mesozoic kimberlite and alkaline–ultrabasic magmatism in the eastern slope of the Anabar Shield (the Ebelyakh, Mayat, and Billyakh river basins).

KW - diamond

KW - Ebelyakh placers

KW - Kholomolokh

KW - Siberian Craton

KW - U–Pb dating

KW - zircon

UR - http://www.scopus.com/inward/record.url?scp=85102129779&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/a2234599-ccff-34e0-9996-1cbd371121aa/

U2 - 10.1134/S1028334X21010141

DO - 10.1134/S1028334X21010141

M3 - Article

AN - SCOPUS:85102129779

VL - 496

SP - 48

EP - 52

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 1

ER -

ID: 28013401