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The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia : New petrological and geochronological constraints. / Shapovalova, M. O.; Tolstykh, N. D.; Shelepaev, R. A. et al.

In: Russian Geology and Geophysics, Vol. 60, No. 8, 08.2019, p. 845-861.

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

Harvard

Shapovalova, MO, Tolstykh, ND, Shelepaev, RA & Tsibizov, LV 2019, 'The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia: New petrological and geochronological constraints', Russian Geology and Geophysics, vol. 60, no. 8, pp. 845-861. https://doi.org/10.15372/RGG2019069

APA

Shapovalova, M. O., Tolstykh, N. D., Shelepaev, R. A., & Tsibizov, L. V. (2019). The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia: New petrological and geochronological constraints. Russian Geology and Geophysics, 60(8), 845-861. https://doi.org/10.15372/RGG2019069

Vancouver

Shapovalova MO, Tolstykh ND, Shelepaev RA, Tsibizov LV. The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia: New petrological and geochronological constraints. Russian Geology and Geophysics. 2019 Aug;60(8):845-861. doi: 10.15372/RGG2019069

Author

Shapovalova, M. O. ; Tolstykh, N. D. ; Shelepaev, R. A. et al. / The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia : New petrological and geochronological constraints. In: Russian Geology and Geophysics. 2019 ; Vol. 60, No. 8. pp. 845-861.

BibTeX

@article{3b6a2670746e4fb78fdf8671552183f8,
title = "The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia: New petrological and geochronological constraints",
abstract = "New petrological, isotope-geochronological, and geophysical data reveal two phases of magmatism in the Oortsog mafic–ultramafic intrusion in Western Mongolia. The intrusion consists of (i) rhythmically layered peridotite gabbro (278.7 ± 2.5 Ma) and (ii) poorly differentiated biotite-containing amphibole–olivine gabbro and gabbronorite (272 ± 2 Ma). The inverse upward succession from leucocratic to melanocratic lithologies within each rhythm indicates that the intrusion was tectonically overturned. The earlier rocks (phase 1) have lower contents of major oxides (Na2O + K2O, TiO2, and P2O5) than the later ones (phase 2) and show different patterns of incompatible elements. The intrusive rocks of phases 1 and 2 were derived from depleted (positive εNd) and enriched (negative εNd) mantle sources, respectively. The calculated parental melts of both phases belong to picritic (Mg-rich) basaltic magma. More insight into the intrusion structure was gained by mapping magnetic anomalies.",
keywords = "Layered intrusion, Mafic–ultramafic rocks, Magnetic-flux density anomaly, Permian age, Western Mongolia",
author = "Shapovalova, {M. O.} and Tolstykh, {N. D.} and Shelepaev, {R. A.} and Tsibizov, {L. V.}",
note = "Publisher Copyright: {\textcopyright} 2019, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2019",
month = aug,
doi = "10.15372/RGG2019069",
language = "English",
volume = "60",
pages = "845--861",
journal = "Russian Geology and Geophysics",
issn = "1068-7971",
publisher = "Elsevier Science B.V.",
number = "8",

}

RIS

TY - JOUR

T1 - The Oortsog peridotite–troctolite–gabbro intrusion, Western Mongolia

T2 - New petrological and geochronological constraints

AU - Shapovalova, M. O.

AU - Tolstykh, N. D.

AU - Shelepaev, R. A.

AU - Tsibizov, L. V.

N1 - Publisher Copyright: © 2019, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2019/8

Y1 - 2019/8

N2 - New petrological, isotope-geochronological, and geophysical data reveal two phases of magmatism in the Oortsog mafic–ultramafic intrusion in Western Mongolia. The intrusion consists of (i) rhythmically layered peridotite gabbro (278.7 ± 2.5 Ma) and (ii) poorly differentiated biotite-containing amphibole–olivine gabbro and gabbronorite (272 ± 2 Ma). The inverse upward succession from leucocratic to melanocratic lithologies within each rhythm indicates that the intrusion was tectonically overturned. The earlier rocks (phase 1) have lower contents of major oxides (Na2O + K2O, TiO2, and P2O5) than the later ones (phase 2) and show different patterns of incompatible elements. The intrusive rocks of phases 1 and 2 were derived from depleted (positive εNd) and enriched (negative εNd) mantle sources, respectively. The calculated parental melts of both phases belong to picritic (Mg-rich) basaltic magma. More insight into the intrusion structure was gained by mapping magnetic anomalies.

AB - New petrological, isotope-geochronological, and geophysical data reveal two phases of magmatism in the Oortsog mafic–ultramafic intrusion in Western Mongolia. The intrusion consists of (i) rhythmically layered peridotite gabbro (278.7 ± 2.5 Ma) and (ii) poorly differentiated biotite-containing amphibole–olivine gabbro and gabbronorite (272 ± 2 Ma). The inverse upward succession from leucocratic to melanocratic lithologies within each rhythm indicates that the intrusion was tectonically overturned. The earlier rocks (phase 1) have lower contents of major oxides (Na2O + K2O, TiO2, and P2O5) than the later ones (phase 2) and show different patterns of incompatible elements. The intrusive rocks of phases 1 and 2 were derived from depleted (positive εNd) and enriched (negative εNd) mantle sources, respectively. The calculated parental melts of both phases belong to picritic (Mg-rich) basaltic magma. More insight into the intrusion structure was gained by mapping magnetic anomalies.

KW - Layered intrusion

KW - Mafic–ultramafic rocks

KW - Magnetic-flux density anomaly

KW - Permian age

KW - Western Mongolia

UR - http://www.scopus.com/inward/record.url?scp=85079479301&partnerID=8YFLogxK

U2 - 10.15372/RGG2019069

DO - 10.15372/RGG2019069

M3 - Article

VL - 60

SP - 845

EP - 861

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 8

ER -

ID: 23290882