Chemical composition of melts of the Early Eocene volcanic center at Cape Khairyuzova, western Kamchatka: Evidence from inclusions in minerals

被引：1

作者：

Kovalenko, D. V. ^{[1
]}

Naumov, V. B. ^{[2
]}

Prokofiev, V. Yu. ^{[1
]}

Ageeva, O. A. ^{[1
]}

Andreeva, O. A. ^{[1
]}

Kovaltchuk, E. V. ^{[1
]}

Erofeeva, K. G. ^{[1
]}

Ugryumova, N. Yu. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Geol Ore Deposits Petrog Mineral & Geochem I, Staromonetny Per 35, Moscow 119017, Russia

[2] Russian Acad Sci, Vernadsky Inst Geochem & Analyt Chem GEOKhI, Ul Kosygina 19, Moscow 119991, Russia

来源：

PETROLOGY | 2017年 / 25卷 / 01期

关键词：

CONTINENTAL-MARGIN; TRACE-ELEMENT; ARC; CLINOPYROXENE;

D O I：

10.1134/S0869591117010052

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Original authors' data on the mineralogy and composition of melt inclusions in two samples show that the Early Eocene magmatic rocks at Cape Khairyuzova were formed by mixing melts of mafic, intermediate, and acid composition, which were derived from different sources. The mafic melt was rich in MgO, and its temperature was 1100-1150A degrees C. The temperature of the acid melt varied from 1070 to 1130A degrees C. The melts are also different in concentrations of trace elements and in their ratios. All three melt types are enriched in LILE and LREE and depleted in HFSE and were likely derived in suprasubductional environments. The mafic and intermediate magmas were formed by melting a mantle wedge and subsequent fractionation of the melts. The acid melts could be formed by melting crustal rocks when they were overheated in the newly formed orogen of significant thickness. When ascending, the mantle melts could mix in variable proportions with acid melts in crustal chambers.

引用

页码：66 / 86

页数：21

共 27 条

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