Variations of Oxygen Isotopic Composition in Magmas of Okhotsk-Chukotka Volcanic Belt

被引：0
作者：
Akinin, V. V. [1 ]
Bindeman, I. N. [2 ,3 ]
机构：
[1] Russian Acad Sci, North East Interdisciplinary Sci Res Inst, Far East Branch, Magadan 685000, Russia
[2] Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA
[3] Russian Acad Sci, Fersman Mineral Museum, Moscow 119071, Russia
来源：
DOKLADY EARTH SCIENCES | 2021年 / 499卷 / 01期
基金：
俄罗斯科学基金会;
关键词：
oxygen isotope; magmatism; volcanic arc; continental margin; Okhotsk-Chukotka volcanic belt; OCVB; GEOCHEMISTRY; EVOLUTION; RUSSIA; RATIOS; ROCKS;
D O I：
10.1134/S1028334X21070035
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
First data on oxygen isotopic composition in phenocrysts in volcanic rocks from Okhotsk-Chukotka volcanic belt (106-78 Ma, North-Eastern Russia) together with Sr and Nd isotopic data gives additional geochemical evidence on belt segmentation. Calculated delta O-18(melt) in calc-alkaline magmas of belt vary from normal-delta O-18 (from +5.2 to +6.9 parts per thousand) consistent with mantle-like signatures of radiogenic isotopes. Low-delta O-18 (from +4.7 to +4.8 parts per thousand) silicic magmas were found in Western-Okhotsk segment of the belt interpreted as assimilation of hydrothermally altered rocks from pre-caldera rifted basement. The highest delta O-18 values were obtained for Chukotka segment of the belt reaching +10.8 parts per thousand and these are correlated with elevated Sr-87/Sr-86 due to assimilation of relatively mature high-delta O-18 continental crust. Comparison with Kamchatka volcanic belt is performed.
引用
收藏
页码：550 / 555
页数：6
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