Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous
Tectonic reconstructions of the Cretaceous paleo-Pacific system show several significant tectonic and magmatic events, including the formation of several spreading centers, microplates and intra-oceanic arcs, and the initiation (>7681 Ma) of magmatic activity which formed the Emperor-Hawaiian sea...
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier Science Bv
2021
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Online Access: | https://doi.org/10.1016/j.earscirev.2021.103703 http://ecite.utas.edu.au/145022 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Geochemistry Inorganic geochemistry |
spellingShingle |
Earth Sciences Geochemistry Inorganic geochemistry Kutyrev, AV Kamenetsky, VS Park, J-W Maas, R Demonterova, EI Antsiferova, TN Ivanov, AV Hwang, J Abersteiner, A Ozerov, AY Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
topic_facet |
Earth Sciences Geochemistry Inorganic geochemistry |
description |
Tectonic reconstructions of the Cretaceous paleo-Pacific system show several significant tectonic and magmatic events, including the formation of several spreading centers, microplates and intra-oceanic arcs, and the initiation (>7681 Ma) of magmatic activity which formed the Emperor-Hawaiian seamount chain. The Olyutorsky (syn. Achayvayam-Valaginsky, ~80 Ma) and Kronotsky (~90 Ma) intra-oceanic arcs were formed in the NW part of the paleo-Pacific and migrated northwest until their accretion onto the NW Asia margin in the Late Paleocene Early Eocene and Late Eocene Early Miocene, respectively. Tectonic remnants of these arcs are preserved as volcanic-sedimentary terranes in the accretionary basement of the Kamchatka Peninsula (Russia). Fragments of the Olyutorsky terrane (OT) are exposed in Eastern Kamchatka, including (from south to north) in the Valaginsky Range (VR), Tumrok Range (TR), and Koryak Highlands (KH). The OT volcanic rocks are characterized by unusually primitive mafic-ultramafic compositions, with low- and high-K characteristics in the north (KH) and high-K in the south (VR and TR), respectively. The primitive compositions of these olivine-phyric (picrites) and basalts provides an opportunity to characterize the magmatic sources of intra-oceanic arcs during the Cretaceous. High-Mg compositions in TR and VR (up to 40 wt% MgO) contain olivine phenocrysts with Fo content up to 94 mol% and high-Cr# spinel (up to 87 mol%), suggesting formation from an unevolved initial melt. Melt inclusions in spinel and olivine are Mg-rich (up to 15 wt% MgO) and have high K 2 O contents (1.83.7 wt% for TR, and 2.33.9 wt% for VR). Picrite whole-rock compositions show strong HFSE depletion and LILE enrichment typical of modern arc rocks. However, LREE-Th enrichment is observed only in VR picrites, suggesting subduction-related modification is particularly strong in the source of magmas erupted in the southern OT. Isotopic compositions in OT picrites ( 87 Sr/ 86 Sr 80 0.7026 to 0.7039, ε Nd80 10.6 to +8.4, ε Hf80 + 20.6 to +16.7) resemble those in modern MORB (particularly Indian MORB) and arc picrites, suggesting that primitive OT arc magmatism originates in mantle wedge peridotite modified by melts and fluids derived from subducted oceanic crust without obvious contributions from continental and oceanic sediments. Compositional similarities between OT arc rocks and coeval early magmatism in the Emperor-Hawaiian melting anomaly suggests that the depleted component of the latter was an Indian-type MORB mantle in the paleo-Pacific region at the start of the Late Cretaceous. Longitudinal variations in OT magmas compositions (e.g. high-K signature, subtly higher 87 Sr/ 86 Sr- 206 Pb/ 204 Pb, and lower ε Nd -ε Hf in VR and TR) may be related to subduction of thicker and possibly older lithosphere in the southern segment of the Olyutorsky arc. Steeper dip angle and stronger deformation/flexure of the subducting plate below this part of the arc could drive the percolation of low-degree alkaline melts from the asthenosphere through the slab, resulting in generation of the petit-spot volcanoes, similar to those in the modern Japan Trench. Further subduction of such alkali-volcanoes may produce the high-K geochemical signature recorded in the southern OT arc terranes. |
format |
Article in Journal/Newspaper |
author |
Kutyrev, AV Kamenetsky, VS Park, J-W Maas, R Demonterova, EI Antsiferova, TN Ivanov, AV Hwang, J Abersteiner, A Ozerov, AY |
author_facet |
Kutyrev, AV Kamenetsky, VS Park, J-W Maas, R Demonterova, EI Antsiferova, TN Ivanov, AV Hwang, J Abersteiner, A Ozerov, AY |
author_sort |
Kutyrev, AV |
title |
Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
title_short |
Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
title_full |
Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
title_fullStr |
Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
title_full_unstemmed |
Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous |
title_sort |
primitive high-k intraoceanic arc magmas of eastern kamchatka: implications for paleo-pacific tectonics and magmatism in the cretaceous |
publisher |
Elsevier Science Bv |
publishDate |
2021 |
url |
https://doi.org/10.1016/j.earscirev.2021.103703 http://ecite.utas.edu.au/145022 |
long_lat |
ENVELOPE(160.000,160.000,56.000,56.000) ENVELOPE(170.535,170.535,61.021,61.021) |
geographic |
Pacific Indian Kamchatka Peninsula Achayvayam |
geographic_facet |
Pacific Indian Kamchatka Peninsula Achayvayam |
genre |
Kamchatka Kamchatka Peninsula Koryak |
genre_facet |
Kamchatka Kamchatka Peninsula Koryak |
op_relation |
http://dx.doi.org/10.1016/j.earscirev.2021.103703 Kutyrev, AV and Kamenetsky, VS and Park, J-W and Maas, R and Demonterova, EI and Antsiferova, TN and Ivanov, AV and Hwang, J and Abersteiner, A and Ozerov, AY, Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous, Earth-Science Reviews, 220 Article 103703. ISSN 0012-8252 (2021) [Refereed Article] http://ecite.utas.edu.au/145022 |
op_doi |
https://doi.org/10.1016/j.earscirev.2021.103703 |
container_title |
Earth-Science Reviews |
container_volume |
220 |
container_start_page |
103703 |
_version_ |
1766051385990709248 |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:145022 2023-05-15T16:59:11+02:00 Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous Kutyrev, AV Kamenetsky, VS Park, J-W Maas, R Demonterova, EI Antsiferova, TN Ivanov, AV Hwang, J Abersteiner, A Ozerov, AY 2021 https://doi.org/10.1016/j.earscirev.2021.103703 http://ecite.utas.edu.au/145022 en eng Elsevier Science Bv http://dx.doi.org/10.1016/j.earscirev.2021.103703 Kutyrev, AV and Kamenetsky, VS and Park, J-W and Maas, R and Demonterova, EI and Antsiferova, TN and Ivanov, AV and Hwang, J and Abersteiner, A and Ozerov, AY, Primitive high-K intraoceanic arc magmas of Eastern Kamchatka: Implications for Paleo-Pacific tectonics and magmatism in the Cretaceous, Earth-Science Reviews, 220 Article 103703. ISSN 0012-8252 (2021) [Refereed Article] http://ecite.utas.edu.au/145022 Earth Sciences Geochemistry Inorganic geochemistry Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1016/j.earscirev.2021.103703 2021-10-04T22:17:21Z Tectonic reconstructions of the Cretaceous paleo-Pacific system show several significant tectonic and magmatic events, including the formation of several spreading centers, microplates and intra-oceanic arcs, and the initiation (>7681 Ma) of magmatic activity which formed the Emperor-Hawaiian seamount chain. The Olyutorsky (syn. Achayvayam-Valaginsky, ~80 Ma) and Kronotsky (~90 Ma) intra-oceanic arcs were formed in the NW part of the paleo-Pacific and migrated northwest until their accretion onto the NW Asia margin in the Late Paleocene Early Eocene and Late Eocene Early Miocene, respectively. Tectonic remnants of these arcs are preserved as volcanic-sedimentary terranes in the accretionary basement of the Kamchatka Peninsula (Russia). Fragments of the Olyutorsky terrane (OT) are exposed in Eastern Kamchatka, including (from south to north) in the Valaginsky Range (VR), Tumrok Range (TR), and Koryak Highlands (KH). The OT volcanic rocks are characterized by unusually primitive mafic-ultramafic compositions, with low- and high-K characteristics in the north (KH) and high-K in the south (VR and TR), respectively. The primitive compositions of these olivine-phyric (picrites) and basalts provides an opportunity to characterize the magmatic sources of intra-oceanic arcs during the Cretaceous. High-Mg compositions in TR and VR (up to 40 wt% MgO) contain olivine phenocrysts with Fo content up to 94 mol% and high-Cr# spinel (up to 87 mol%), suggesting formation from an unevolved initial melt. Melt inclusions in spinel and olivine are Mg-rich (up to 15 wt% MgO) and have high K 2 O contents (1.83.7 wt% for TR, and 2.33.9 wt% for VR). Picrite whole-rock compositions show strong HFSE depletion and LILE enrichment typical of modern arc rocks. However, LREE-Th enrichment is observed only in VR picrites, suggesting subduction-related modification is particularly strong in the source of magmas erupted in the southern OT. Isotopic compositions in OT picrites ( 87 Sr/ 86 Sr 80 0.7026 to 0.7039, ε Nd80 10.6 to +8.4, ε Hf80 + 20.6 to +16.7) resemble those in modern MORB (particularly Indian MORB) and arc picrites, suggesting that primitive OT arc magmatism originates in mantle wedge peridotite modified by melts and fluids derived from subducted oceanic crust without obvious contributions from continental and oceanic sediments. Compositional similarities between OT arc rocks and coeval early magmatism in the Emperor-Hawaiian melting anomaly suggests that the depleted component of the latter was an Indian-type MORB mantle in the paleo-Pacific region at the start of the Late Cretaceous. Longitudinal variations in OT magmas compositions (e.g. high-K signature, subtly higher 87 Sr/ 86 Sr- 206 Pb/ 204 Pb, and lower ε Nd -ε Hf in VR and TR) may be related to subduction of thicker and possibly older lithosphere in the southern segment of the Olyutorsky arc. Steeper dip angle and stronger deformation/flexure of the subducting plate below this part of the arc could drive the percolation of low-degree alkaline melts from the asthenosphere through the slab, resulting in generation of the petit-spot volcanoes, similar to those in the modern Japan Trench. Further subduction of such alkali-volcanoes may produce the high-K geochemical signature recorded in the southern OT arc terranes. Article in Journal/Newspaper Kamchatka Kamchatka Peninsula Koryak eCite UTAS (University of Tasmania) Pacific Indian Kamchatka Peninsula ENVELOPE(160.000,160.000,56.000,56.000) Achayvayam ENVELOPE(170.535,170.535,61.021,61.021) Earth-Science Reviews 220 103703 |