Water in melt inclusions from phenocrysts of dacite pumice of the Vetrovoy Isthmus (Iturup Island, Southern Kuriles)

9th All Russian petrographic conference with international participation: Petrology of magmatic and metamorphic complexes

Kotov, A.A.^1,2 ; Smirnov, S.Z.^1,3 ; Maksimovich, I.A.^1,2 ; Yu Plechov, P.^4 ; Chertkova, N.V.^5 ; Befus, A.I.^6

V S Sobolev Institute of Geology and Mineralogy SB RAS, pr. ak. Koptyga, 3, Novosibirsk

630090, Russia^1

Novosibirsk State University, Pirogova, 1/2, Novosibirsk

630090, Russia^2

Tomsk State University, pr. Lenina, 36, Tomsk

634050, Russia^3

A e Fersman Mineralogical Museum RAS, Leninsky pr, 18, Moscow, Russia^4

Institute of Experimental Mineralogy RAS, ak. Osipyana str., 4, Chernogolovka, Moscow area

142432, Russia^5

University of South Florida, School of Geosciences, Tampa

FL, United States^6

关键词: Fluid pressures;    Glasses In;    Island arc;    Kamchatka;    Melt inclusions;    Pumice stones;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/110/1/012009/pdf
DOI  :  10.1088/1755-1315/110/1/012009

来源: IOP

【 摘 要 】

This work is devoted to the study of one of the largest caldera eruptions of the Kurile-Kamchatka island-arc system that occurred on the island of Iturup. The object of investigation of this work are phenocrysts of quartz and plagioclase from dacite pumice of the Isthmus of the Isthmus, which is located on the island of Iturup. The purpose of this work is to determine the water content in the melts that participated in the caldera eruption of the Vetrovoy Isthmus and the patterns of their changes during the crystallization of magma. In the course of the work, the following were carried out: 1) adaptation and calibration of the Raman spectroscopy method for determining water in rhyolite melt's inclusions glasses in quartz and plagioclase from pumice stone; 2) determination of composition and estimation of water content in melt inclusions in quartz and plagioclase according to x-ray spectral analysis; 3) establishment of the regularities of the change in the water content during the evolution of the magmatic melt; 4) evaluation of fluid pressure by comparison with experimental data.