Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources
Isotopic composition of Sr, O, Nd, and Pb was determined in K-Na alkaline gabbroids and basaltoids that formed in eastern Kamchatka during Middle Miocene (gabbroids of the subvolcanic complex) and Late Miocene (basaltoids of the volcanic complex) time, before the origin of the Eastern Kamchatka Volc...
Main Authors: | , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Montclair State University Digital Commons
1997
|
Subjects: | |
Online Access: | https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/379 |
id |
ftmontclairstuni:oai:digitalcommons.montclair.edu:earth-environ-studies-facpubs-1378 |
---|---|
record_format |
openpolar |
spelling |
ftmontclairstuni:oai:digitalcommons.montclair.edu:earth-environ-studies-facpubs-1378 2023-07-23T04:20:05+02:00 Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources Volynets, O. N. Karpenko, Simon F. Kay, R. W. Gorring, Matthew 1997-10-01T07:00:00Z https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/379 unknown Montclair State University Digital Commons https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/379 Department of Earth and Environmental Studies Faculty Scholarship and Creative Works text 1997 ftmontclairstuni 2023-07-03T21:48:28Z Isotopic composition of Sr, O, Nd, and Pb was determined in K-Na alkaline gabbroids and basaltoids that formed in eastern Kamchatka during Middle Miocene (gabbroids of the subvolcanic complex) and Late Miocene (basaltoids of the volcanic complex) time, before the origin of the Eastern Kamchatka Volcanic Belt. The variations in the isotopic parameters of the gabbroids and basaltoids are, respectively, as follows: 87Sr/86Sr = 0.70381-0.70465 and 0.70362-0.70512, no data on δ18O and δ18O ranging from +6.0 to +10.4‰, εNd ranges from +3.8 to +10.4 and from +2.0 to +7.1, 206Pb/204Pb = 17.818-18.164 and 17.880-18.105, 207Pb/204Pb = 15.427-15.475 and 15.479-15.537, 208Pb/204Pb = 37.542-37.964 and 37.950-38.239. Systematic covariations were detected for isotopes of Sr, O, Nd, and Pb with one another and with some geochemical parameters of the rocks. This led us to propose a two-component mixing model for the initial magmas, which were produced by the melting of the material of an enriched mantle plume (EM 1) and the depleted mantle of the MORE type. Isotopic data provide further evidence that the sources of the Late Cenozoic volcanics of the within-plate and island-arc geochemical types were different. Text Kamchatka Montclair State University Digital Commons |
institution |
Open Polar |
collection |
Montclair State University Digital Commons |
op_collection_id |
ftmontclairstuni |
language |
unknown |
description |
Isotopic composition of Sr, O, Nd, and Pb was determined in K-Na alkaline gabbroids and basaltoids that formed in eastern Kamchatka during Middle Miocene (gabbroids of the subvolcanic complex) and Late Miocene (basaltoids of the volcanic complex) time, before the origin of the Eastern Kamchatka Volcanic Belt. The variations in the isotopic parameters of the gabbroids and basaltoids are, respectively, as follows: 87Sr/86Sr = 0.70381-0.70465 and 0.70362-0.70512, no data on δ18O and δ18O ranging from +6.0 to +10.4‰, εNd ranges from +3.8 to +10.4 and from +2.0 to +7.1, 206Pb/204Pb = 17.818-18.164 and 17.880-18.105, 207Pb/204Pb = 15.427-15.475 and 15.479-15.537, 208Pb/204Pb = 37.542-37.964 and 37.950-38.239. Systematic covariations were detected for isotopes of Sr, O, Nd, and Pb with one another and with some geochemical parameters of the rocks. This led us to propose a two-component mixing model for the initial magmas, which were produced by the melting of the material of an enriched mantle plume (EM 1) and the depleted mantle of the MORE type. Isotopic data provide further evidence that the sources of the Late Cenozoic volcanics of the within-plate and island-arc geochemical types were different. |
format |
Text |
author |
Volynets, O. N. Karpenko, Simon F. Kay, R. W. Gorring, Matthew |
spellingShingle |
Volynets, O. N. Karpenko, Simon F. Kay, R. W. Gorring, Matthew Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
author_facet |
Volynets, O. N. Karpenko, Simon F. Kay, R. W. Gorring, Matthew |
author_sort |
Volynets, O. N. |
title |
Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
title_short |
Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
title_full |
Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
title_fullStr |
Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
title_full_unstemmed |
Isotopic Composition of Late Neogene K-Na Alkaline Basalts of Eastern Kamchatka: Indicators of the Heterogeneity of the Mantle Magma Sources |
title_sort |
isotopic composition of late neogene k-na alkaline basalts of eastern kamchatka: indicators of the heterogeneity of the mantle magma sources |
publisher |
Montclair State University Digital Commons |
publishDate |
1997 |
url |
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/379 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Department of Earth and Environmental Studies Faculty Scholarship and Creative Works |
op_relation |
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/379 |
_version_ |
1772183805070671872 |