Mineral composition of tephra layers in the Quaternary deposits of the Sea of Okhotsk:: Heavy minerals associations and their geochemistry

Derkachev, A. N., Nikolaeva, N. A. and Portnyagin, Maxim V. (2016) Mineral composition of tephra layers in the Quaternary deposits of the Sea of Okhotsk:: Heavy minerals associations and their geochemistry Geochemistry International, 54 (2). pp. 167-196. DOI 10.1134/S0016702915120022.

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Abstract

Heavy mineral associations from tephra layers in the Quaternary deposits of the Sea of Okhotsk and their chemical characteristics were studied by various techniques. It was shown that such investigations may have a bearing on the problems of tephrostratigraphic correlation. We assessed the possibility of application of the mineral composition of distal tephra for identification and, in particular, estimation of the relation of tephras to the explosive volcanism of back-arc and frontal zones of island arcs. The investigation of the compositions of minerals and use of mineral geothermometers and geobarometers (two-pyroxene, magnetite–ilmenite, and amphibole) provided evidence on the physicochemical parameters of melt crystallization during the explosive volcanic eruptions that produced the distal tephra layers. It was established that the pyroclastic material of some tephra layers was supplied during explosive eruptions not only from shallow magma chambers but also from deeper and higher temperature reservoirs. Together with the geochemical signatures of volcanic glasses, the obtained results on mineral associations and the geochemistry of mineral inclusions are applicable for the comparative analysis and correlation of tephras from marine and continental sequences, as well as for the identification of explosive volcanic products in adjacent land areas.

Document Type: Article
Additional Information: Original Russian Text © A.N. Derkachev, N.A. Nikolaeva, M.V. Portnyagin, 2016, published in Geokhimiya, 2016, No. 2, pp. 182–211. - WOS:000370383700003
Keywords: Sea of Okhotsk, distal tephra, tephrostratigraphy, heavy mineral associations, geochemistry of minerals, two-pyroxene geothermometer, Fe–Ti oxide and amphibole geothermobarometers, RV Sonne, SO178
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1134/S0016702915120022
ISSN: 0016-7029
Related URLs:
Projects: KOMEX II, KALMAR
Expeditions/Models:
Date Deposited: 24 Feb 2016 08:12
Last Modified: 06 Nov 2017 11:03
URI: http://eprints.uni-kiel.de/id/eprint/31483

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