Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas
Cretaceous rocks comparable to mid-oceanic ridge and oceanic island basalts were described in ophiolite association of the Cape Kamchatskii, Eastern Kamchatka (Fedorchuk et al., 1989). New data on the composition of these basalts, their spinels, and melt inclusions in them are presented in this pape...
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ftoceanrep:oai:oceanrep.geomar.de:1650 2023-05-15T16:58:48+02:00 Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas Portnyagin, Maxim Savel'ev, D. P. Hoernle, Kaj 2005 text https://oceanrep.geomar.de/id/eprint/1650/ https://oceanrep.geomar.de/id/eprint/1650/1/Portnyagin-2005-Petrology.pdf http://www.maik.rssi.ru/cgi-bin/search.pl?type=abstract&name=petreng&number=6&year=5&page=571 en eng MAIK https://oceanrep.geomar.de/id/eprint/1650/1/Portnyagin-2005-Petrology.pdf Portnyagin, M. , Savel'ev, D. P. and Hoernle, K. (2005) Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas. Petrology, 13 (6). pp. 571-588. info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep 2023-04-07T14:44:29Z Cretaceous rocks comparable to mid-oceanic ridge and oceanic island basalts were described in ophiolite association of the Cape Kamchatskii, Eastern Kamchatka (Fedorchuk et al., 1989). New data on the composition of these basalts, their spinels, and melt inclusions in them are presented in this paper. Spinel from olivine–plagioclase basalts corresponds in composition to that of mid-oceanic ridge tholeiites (Mg# = 0.57−0.82, Cr# = 0.33–0.55, TiO2 = 0.03–0.85 wt %). High-K alkali basalts include less magnesian and chro- mian (Mg# = 0.57–0.70, Cr# = 0.23–0.30), but Ti-rich (TiO2 = 0.60–0.86 wt %) spinel. Low Cr# and very low Fe3+ contents of spinel distinguish the studied rocks from island-arc basalts of Eastern Kamchatka. Melt inclu- sions in spinel from plagioclase–olivine basalts have tholeiitic low-alkali (Na2O = 0.8–2.5 wt %, K2O = 0.01−0.09 wt %), high-Ca (CaO = 13–15 wt %), and low-Ti (TiO2 = 0.2–1.2 wt %) composition. Chlorine con- centrations are extremely low in the melt inclusions (Cl < 0.005 wt %), while S contents are high (S = 0.12 ± 0.03 wt %). Concentrations of incompatible elements in inclusions (La = 0.3–1.2 ppm, Sr = 27–70 ppm, Zr = 13–21 ppm) are systematically lower than in typical oceanic tholeiites. The melts are selectively enriched in K, Sr, and Ba relative to REE in the N-MORB-normalized trace-element spectra. Participation of plume com- ponent in the formation of the Late Cretaceous rift-related basalts of the Pacific Ocean, which are incorporated now in ophiolite association of the Cape Kamchatskii, is inferred from indicative rock assemblage and compo- sition of primitive melts and spinel. Article in Journal/Newspaper Kamchatka OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Cretaceous rocks comparable to mid-oceanic ridge and oceanic island basalts were described in ophiolite association of the Cape Kamchatskii, Eastern Kamchatka (Fedorchuk et al., 1989). New data on the composition of these basalts, their spinels, and melt inclusions in them are presented in this paper. Spinel from olivine–plagioclase basalts corresponds in composition to that of mid-oceanic ridge tholeiites (Mg# = 0.57−0.82, Cr# = 0.33–0.55, TiO2 = 0.03–0.85 wt %). High-K alkali basalts include less magnesian and chro- mian (Mg# = 0.57–0.70, Cr# = 0.23–0.30), but Ti-rich (TiO2 = 0.60–0.86 wt %) spinel. Low Cr# and very low Fe3+ contents of spinel distinguish the studied rocks from island-arc basalts of Eastern Kamchatka. Melt inclu- sions in spinel from plagioclase–olivine basalts have tholeiitic low-alkali (Na2O = 0.8–2.5 wt %, K2O = 0.01−0.09 wt %), high-Ca (CaO = 13–15 wt %), and low-Ti (TiO2 = 0.2–1.2 wt %) composition. Chlorine con- centrations are extremely low in the melt inclusions (Cl < 0.005 wt %), while S contents are high (S = 0.12 ± 0.03 wt %). Concentrations of incompatible elements in inclusions (La = 0.3–1.2 ppm, Sr = 27–70 ppm, Zr = 13–21 ppm) are systematically lower than in typical oceanic tholeiites. The melts are selectively enriched in K, Sr, and Ba relative to REE in the N-MORB-normalized trace-element spectra. Participation of plume com- ponent in the formation of the Late Cretaceous rift-related basalts of the Pacific Ocean, which are incorporated now in ophiolite association of the Cape Kamchatskii, is inferred from indicative rock assemblage and compo- sition of primitive melts and spinel. |
format |
Article in Journal/Newspaper |
author |
Portnyagin, Maxim Savel'ev, D. P. Hoernle, Kaj |
spellingShingle |
Portnyagin, Maxim Savel'ev, D. P. Hoernle, Kaj Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
author_facet |
Portnyagin, Maxim Savel'ev, D. P. Hoernle, Kaj |
author_sort |
Portnyagin, Maxim |
title |
Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
title_short |
Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
title_full |
Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
title_fullStr |
Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
title_full_unstemmed |
Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas |
title_sort |
plume-related association of cretaceous oceanic basalts of eastern kamchatka: compositions of spinel and parental magmas |
publisher |
MAIK |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/1650/ https://oceanrep.geomar.de/id/eprint/1650/1/Portnyagin-2005-Petrology.pdf http://www.maik.rssi.ru/cgi-bin/search.pl?type=abstract&name=petreng&number=6&year=5&page=571 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://oceanrep.geomar.de/id/eprint/1650/1/Portnyagin-2005-Petrology.pdf Portnyagin, M. , Savel'ev, D. P. and Hoernle, K. (2005) Plume-related association of Cretaceous oceanic basalts of eastern Kamchatka: compositions of spinel and parental magmas. Petrology, 13 (6). pp. 571-588. |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766050910987878400 |