TY - JOUR

T1 - Triassic Diamondiferous Tuffaceous–Sedimentary Rocks in the Arctic Zone of Siberia

AU - Grakhanov, S. A.

AU - Proskurnin, V. F.

AU - Petrov, O. V.

AU - Sobolev, N. V.

N1 - Funding Information: The work was partly supported by grant 19-17-00128 from the Russian Science Foundation. Publisher Copyright: © 2022, Novosibirsk State University.

PY - 2022/4

Y1 - 2022/4

N2 - In the Arctic zone of Siberia, large diamond occurrences have been discovered in volcaniclastic, sedimentary–volcaniclastic, volcanosedimentary, and sedimentary rocks of the upper Ladinian strata and the base of the Carnian (Triassic) strata. They are confined to the Primorye mineragenic zone, which is traced along the Laptev Sea water area from the western Verkhoyansk area to eastern Taimyr. We have first identified a specific range of diamonds in these deposits. Among the rounded crystals of varieties I, II, V, and VII, there are grains with a light carbon isotope composition and high nitrogen contents. They have no analogues in typomorphic features in the known primary deposits of Yakutia but are completely similar to diamonds in the Rhaetian, Early Jurassic, Late Jurassic, Early Cretaceous, Neogene, and Quaternary commercial placers and placer occurrences, which suggests their formation as a result of the erosion of Triassic sources.

AB - In the Arctic zone of Siberia, large diamond occurrences have been discovered in volcaniclastic, sedimentary–volcaniclastic, volcanosedimentary, and sedimentary rocks of the upper Ladinian strata and the base of the Carnian (Triassic) strata. They are confined to the Primorye mineragenic zone, which is traced along the Laptev Sea water area from the western Verkhoyansk area to eastern Taimyr. We have first identified a specific range of diamonds in these deposits. Among the rounded crystals of varieties I, II, V, and VII, there are grains with a light carbon isotope composition and high nitrogen contents. They have no analogues in typomorphic features in the known primary deposits of Yakutia but are completely similar to diamonds in the Rhaetian, Early Jurassic, Late Jurassic, Early Cretaceous, Neogene, and Quaternary commercial placers and placer occurrences, which suggests their formation as a result of the erosion of Triassic sources.

KW - Arctic zone of Siberia

KW - deposit

KW - diamond

KW - placer

KW - Triassic

UR - http://www.scopus.com/inward/record.url?scp=85140475067&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/9bb1ac76-bdaa-36af-b299-a8bcbc324c58/

U2 - 10.2113/RGG20214431

DO - 10.2113/RGG20214431

M3 - Article

AN - SCOPUS:85140475067

VL - 63

SP - 458

EP - 482

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 4

ER -