Petrogenesis of volcanic rocks from Eastern Manus Basin:indications in mineralogy and geochemistry

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	Petrogenesis of volcanic rocks from Eastern Manus Basin:indications in mineralogy and geochemistry
	Xia ZHAO; Liyan TIAN ; Jianhui SUN ; Peng HUANG ; Yan LI; Yue GAO
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2021-01-15
出版年	2021
卷号	v.39 期号:01 页码:91-111
文献类型	CNKI期刊论文
摘要	To understand the petrogenesis and magma evolution history in the Eastern Manus Basin(EMB),geochemistry of pyroxene and plagioclase mineral phenocrysts in basaltic andesites and dacites were reported.The plagioclase-melt thermometry showed that,plagioclase in dacites crystalized in1 027.2-1 028.5℃ under 3.37-5.08 kbar,whereas in basaltic andesite was 1 181.4-1 187.0℃ under1.79-4.46 kbar.Pyroxene compositions and invariable La/Sm vs La values of whole rock powders indicate that lavas were erupted in rapid cooling rate and mainly controlled by fractional crystallization(FC).In addition,oscillatory zonings in plagioclase and pyroxene phenocrysts indicated small local perturbations and degassing episodes in the magma chamber.Some high Mg# clinopyroxene antecrysts were found in EMB lavas.The highest Mg# of parental EMB melts is 69,which falls into the range of initial partial melts from upper mantle peridotite source(68-75).In terms of isotopic compositions,the EMB lavas most likely originated from Indian-type MORB mantle which was influenced by subduction components.In details,the subduction components are mainly derived from the dehydration of a subducted altered oceanic crust,and the contribution of sediment influence is minor.The Pb isotopic compositions and end member modeling further suggest that the source of subduction components is more likely from the Pacific Plate instead of the Solomon Plate.
关键词	Eastern Manus Basin plagioclase pyroxene whole rock Sr-Nd-Pb isotope magma
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P588.14;P736
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Nos. XDB42020303, XDA11030302) ; the National Natural Science Foundation of China (No. 41576055) ; the National Basic Research Program of China (973 Program)(No. 2013CB429702)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187892
专题	中国科学院海洋研究所
作者单位	1.CASKeyLaboratoryforExperimentalStudyunderDeep-seaExtremeConditions,InstituteofDeep-seaScienceandEngineering,ChineseAcademyofSciences 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.UniversityofChineseAcademyofSciences 4.CenterforOceanMega-Science,ChineseAcademyofSciences 5.LaboratoryforMarineGeology,QingdaoNationalLaboratoryforMarineScienceandTechnology
推荐引用方式 GB/T 7714	Xia ZHAO,Liyan TIAN,Jianhui SUN,et al. Petrogenesis of volcanic rocks from Eastern Manus Basin:indications in mineralogy and geochemistry. 2021.