Mineral composition of tephra layers in the Quaternary deposits of the Sea of Okhotsk:: Heavy minerals associations and their geochemistry
- 作者: Derkachev A.N.1, Nikolaeva N.A.1, Portnyagin M.V.2,3
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隶属关系:
- Il’ichev Pacific Oceanological Institute, Far East Branch
- GEOMAR Helmholtz Centre for Ocean Research
- Vernadsky Institute of Geochemistry and Analytical Chemistry
- 期: 卷 54, 编号 2 (2016)
- 页面: 167-196
- 栏目: Article
- URL: https://journals.rcsi.science/0016-7029/article/view/155078
- DOI: https://doi.org/10.1134/S0016702915120022
- ID: 155078
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详细
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.
作者简介
A. Derkachev
Il’ichev Pacific Oceanological Institute, Far East Branch
编辑信件的主要联系方式.
Email: derkachev@poi.dvo.ru
俄罗斯联邦, Baltiiskaya ul. 43, Vladivostok, 690041
N. Nikolaeva
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: derkachev@poi.dvo.ru
俄罗斯联邦, Baltiiskaya ul. 43, Vladivostok, 690041
M. Portnyagin
GEOMAR Helmholtz Centre for Ocean Research; Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: derkachev@poi.dvo.ru
德国, Kiel; ul. Kosygina 19, Moscow, 119991
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