Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Carbon sources and the graphitization of carbonaceous matter in precambrian rocks of the Keivy Terrane (Kola Peninsula, Russia). / Fomina, Ekaterina; Kozlov, Evgeniy; Lokhov, Kirill; Lokhova, Olga; Bocharov, Vladimir.
в: Minerals, Том 9, № 2, 94, 02.2019.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Carbon sources and the graphitization of carbonaceous matter in precambrian rocks of the Keivy Terrane (Kola Peninsula, Russia)
AU - Fomina, Ekaterina
AU - Kozlov, Evgeniy
AU - Lokhov, Kirill
AU - Lokhova, Olga
AU - Bocharov, Vladimir
PY - 2019/2
Y1 - 2019/2
N2 - The Precambrian rocks of the Keivy Terrane reveal five types of carbonaceous matter (CM): Fine-grained, flaky, nest, vein, and spherulitic. These types differ in their distribution character, carbon isotope composition, and graphitization temperatures calculated by the Raman spectra of carbonaceous material (RSCM) geothermometry. Supracrustal rocks of the Keivy Terrane contain extremely isotopically light (δ 13 C PDB = –43 ± 3‰) carbon. Presumably, its source was a methane–aqueous fluid. According to temperature calculations, this carbon matter and the host strata underwent at least two stages of metamorphism in the west of the Keivy Terrane and one stage in the east. The CM isotope signatures of several samples of kyanite schists (δ 13 C PDB = –33 ± 5‰) are close to those of oils and oil source rocks, and they indicate an additional carbon reservoir. Thus, in the Keivy territory, an oil-and-gas bearing basin has existed. Heavy carbon (δ 13 C PDB = −8 ± 3‰) precipitated from an aqueous CO 2 -rich fluid is derived from either the lower crust or the mantle. This fluid probably migrated from the Keivy alkaline granites into the surrounding rocks previously enriched with “methanogenic” carbon.
AB - The Precambrian rocks of the Keivy Terrane reveal five types of carbonaceous matter (CM): Fine-grained, flaky, nest, vein, and spherulitic. These types differ in their distribution character, carbon isotope composition, and graphitization temperatures calculated by the Raman spectra of carbonaceous material (RSCM) geothermometry. Supracrustal rocks of the Keivy Terrane contain extremely isotopically light (δ 13 C PDB = –43 ± 3‰) carbon. Presumably, its source was a methane–aqueous fluid. According to temperature calculations, this carbon matter and the host strata underwent at least two stages of metamorphism in the west of the Keivy Terrane and one stage in the east. The CM isotope signatures of several samples of kyanite schists (δ 13 C PDB = –33 ± 5‰) are close to those of oils and oil source rocks, and they indicate an additional carbon reservoir. Thus, in the Keivy territory, an oil-and-gas bearing basin has existed. Heavy carbon (δ 13 C PDB = −8 ± 3‰) precipitated from an aqueous CO 2 -rich fluid is derived from either the lower crust or the mantle. This fluid probably migrated from the Keivy alkaline granites into the surrounding rocks previously enriched with “methanogenic” carbon.
KW - Alkaline granites
KW - Carbon isotopes
KW - Graphite
KW - Graphitization
KW - Kola Peninsula
KW - Polyphase metamorphism
KW - Precambrian
KW - RSCM geothermometry
KW - HYDROTHERMAL ALTERATION
KW - GRAPHITE THERMOMETRY
KW - graphitization
KW - alkaline granites
KW - RAMAN-SPECTROSCOPY
KW - polyphase metamorphism
KW - SOUTHERN INDIA
KW - METAMORPHIC ROCKS
KW - METASEDIMENTS
KW - MAGMATISM
KW - graphite
KW - APPLICABILITY
KW - ALKALINE PROVINCE
KW - ISOTOPE
KW - carbon isotopes
UR - http://www.scopus.com/inward/record.url?scp=85062369804&partnerID=8YFLogxK
U2 - 10.3390/min9020094
DO - 10.3390/min9020094
M3 - Article
AN - SCOPUS:85062369804
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 2
M1 - 94
ER -
ID: 49681764