检索结果-南通市图书馆

Magma Evolution Processes in the Southern Okinawa Trough:Insights from melt inclusions

Journal of Ocean University of China 2021年第6期20卷 1383-1397页

作者： ZHANG Yujiao ZHAI Shikui Key Laboratory of Submarine Geosciences and Prospection of Ministry of Education Ocean University of ChinaQingdao 266100China

The Okinawa Trough is an initial back-arc basin that is influenced by the subduction of the Philippine Sea Plate and develops on the continental *** Okinawa Trough is a natural laboratory for the study of basin evolution,magmatism,and crustmantle processes in the early stage of back-arc *** inclusions are small droplets of magma that are captured during the mineral crystallization process and can record the geochemical composition changes during magma *** this study,the geochemical compositions of melt inclusions in host plagioclases of two volcanic rock samples at Station nos.9-1 and 9-2 from the southern Okinawa Trough are systematically *** on previous studies,the origin and evolution of magma and the introduction of subducting materials in the study area are *** show that melt inclusions are characterized by the relative enrichment of large-ion lithophile elements,depletion of high-field-strength elements,and slight enrichment of rare earth ***,the subduction of the Philippine Sea Plate introduced sediment-derived melts and fluids into the magma source area of the southern Okinawa ***,4%to 5%partial melting of the hydrated mantle produces basaltic *** melt inclusions of andesite and dacite investigated in this study were formed by fractional crystallization of basaltic ***,the crystallization of plagioclase,pyroxene,and magnetite occurred during the late stage of magma *** temperature-pressure data show that the melt inclusions in plagioclase have two capture periods:one is at temperatures above 1250℃and the other is at temperatures between 1180℃and 1200℃.The capture pressure of the inclusions at temperatures between 1180℃and 1200℃is between 5.6 kPa and 6.1 kPa,corresponding to the depth of 15–17 km below the *** geochemical characteristics of major and trace elements in inclusions show that the samples from two stations(i.e.,9-1 and 9-2)have similar

关键词： melt inclusions magma evolution processes contamination of crustal materials introduction of subducting materials the southern Okinawa Trough

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon Enrichment in the Lithospheric Mantle:Evidence from the melt inclusions in Mantle Xenoliths from the Hainan Basalts

引用

Acta Geologica Sinica(English Edition) 2023年第1期97卷 358-375页

作者： XU Xin TIAN Wei ZHANG Lifei LI Huijuan The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of EducationSchool of Earth and Space SciencesPeking UniversityBeijing 100871China

It is generally believed that the lithospheric mantle and the mantle transition zone are important carbon ***,the location of carbon storage in Earth's interior and the reasons for carbon enrichment remain *** this study,we report CO_(2)-rich olivine-hosted melt inclusions in the mantle xenoliths of late Cenozoic basalts from the Penglai area,Hainan Province,which may shed some light on the carbon enrichment process in the lithospheric *** also present a detailed petrological and geochemical investigation of the late Cenozoic basalts and mantle xenoliths from northern Hainan *** collected samples of late Cenozoic Hainan Island basalts belong to both alkaline and subalkaline series,showing fractionated REE patterns with high(La/Yb)_(N)values of 3.52–11.77,which are typical for *** on Al-in-olivine thermometry,the temperatures estimated for the mantle xenoliths can be divided into two *** group has temperatures of less than 1050℃,and the other group has temperature ranging from 1050℃to 1282℃.Clinopyroxene(La/Yb)_(N)–Ti/Eu and clinopyroxene Ca/Al–Mg^(#)diagrams indicate that the mantle peridotite experienced metasomatism from both silicate and carbonate *** inclusions in the olivine of mantle xenoliths include(1)CO_(2)bubble–rich melt inclusions;(2)multiphase melt inclusions(glass+CO_(2)bubble+daughter minerals);(3)pure glass melt *** is a daughter mineral in the olivine-hosted melt inclusions,which could be interpreted as a secondary mineral formed by the interactions of CO_(2)-rich fluids with an olivine host,due to post-entrapment *** glasses in olivine-hosted melt inclusions have high SiO_(2)contents(60.21–77.72 wt%).Our results suggest that a considerable amount of CO_(2)-rich melt inclusions are captured in the lithospheric mantle during *** lithospheric mantle can therefore act as is a‘carbon trap',with much CO_(2)being absorbed by the lithospheric mantle in this way.

关键词： melt inclusions lithospheric mantle metasomatism carbon trap Hainan Island

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genesis and evolution of subduction-zone andesites:evidence from melt inclusions

Genesis and evolution of subduction-zone andesites:evidence ...

引用

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Ming-Shuai Zhu Lai-Cheng Miao Shun-Hu Yang Institute of Geology and Geophysics Chinese Academy of Sciences

Andesite magmatism plays a major role in continental crustal growth,but its subduction-zone origin and evolution is still a hotly debated *** with whole-rock analyses,melt inclusions(MIs)can provide important direct information on the processes of magma *** this article,we synthesize data for melt inclusions hosted by phenocrysts in andesites, extracted from the GEOROC global *** data show that melt inclusions entrapped by different phenocrysts have distinct compositions:olivine-hosted melt inclusions have basalt and basaltic andesite compositions,whereas melt inclusions in clinopyroxene and othopyroxene are mainly dacitic to ***-hosted melt inclusions have rhyolite *** compositions of melt inclusions entrapped by plagioclase are scattered,spanning from andesite to rhyolite. On the basis of the compositional data,we propose a mixing model for the genesis of the andesite,and a two-chamber mechanism to account for the evolution of the ***,andesite melt is generated in the lower chamber by mixing of a basaltic melt derived from the mantle and emplaced in the lower crust with a felsic melt resulting from partial melting of crustal *** and minor plagioclase likely crystallize in the lower magma ***,the andesite melt ascends into the upper chamber where other phenocrysts *** to SiO-MgO diagrams of the MIs,evolution of the andesite in the upper chamber can be subdivided into two distinct *** early stage(Ⅰ)is characterized by a phenocrystal assemblage of clinopyroxene+othopyroxene + plagioclase,whereas the late stage(Ⅱ)is dominated by crystallization ofplagioclase + hornblende.

关键词： melt inclusions petrogenesis of andesite magma mixing two-chamber phenocryst assemblage

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Charnockite microstructures:From magmatic to metamorphic

引用

Geoscience Frontiers 2012年第6期3卷 745-753页

作者： Jacques L.R.Touret Jan Marten Huizenga Musee de Mineralogie MINES ParisTech75272 Paris Cedex 06France Department of Geology.School of Environmental Sciences and Development North-West UniversityPrivate Bag X6001Potchefstroom 2520South Africa

Charnockites sensu lato （charnockite-enderbite series） are lower crustal felsic rocks typically characterised by the presence of anhydrous minerals including orthopyroxene and garnet. They either represent dry （H2O-poor） felsic magmas that are emplaced in the lower crust or granitic intrusions that have been dehydrated during a subsequent granulite facies metamorphic event. In the first case, post- magmatic high-temperature recrystallisation may result in widespread metamorphic granulite microstruc- tures, superimposed or replacing the magmatic microstructures. Despite recrystallisation, magmatic remnants may still be found, notably in the form of melt-related microstructures such as melt inclusions. For both magmatic charnockites and dehydrated granites, subsequent fluid-mineral interaction at inter- grain boundaries during retrogradation are documented by microstructures including K-feldspar micro- veins and myrmekites. They indicate that a large quantity of low-H2O activity salt-rich brines, were present （together with CO2 under immiscible conditions） in the lower crust.

关键词： Charnockite Petrology Microstructure melt inclusions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The 2010 Merapi Eruption： An Overview of melt Inclusion and Geochemical Data

引用

Journal of Earth Science and Engineering 2012年第9期2卷 522-537页

作者： Hanik Humaida Narsito Tri Wulaningsih Subandriyo Kirbani Sri Brotopuspito Harno Dwi Pranowo Koichiro Watanabe Yasuhito Osanai Nugroho Setiawan Tatsuro Adachi Dewi Sri Sayudi Moch Muzani Raditya Putra Center for Volcanology and Geological Hazard Mitigation Geological Agency of Indonesia Bandung 55166 Indonesia Department of Chemistry Gadjah Mada University Yogyakarta 55281 Indonesia Department of Earth Resources Engineering Kyushu University Fukuoka 819-0395 Japan Department of Environmental Changes Kyushu University Fukuoka 819-0395 Japan Department of Geology Gadjah Mada University Yogyakarta 55281 Indonesia

To characterize the magma that gave rise to explosive eruptions of Merapi volcano in October-November 2010, melt inclusions and juvenile components fiom the eruption deposits have been analyzed. Major-element compositions of whole-rocks were analyzed by X-ray fluorescence and trace elements, including the Rare Earth Elements by inductively coupled plasma mass spectrometry. melt inclusions and the host minerals were analyzed using energy-dispersive X-ray spectroscopy and CO2 and H20 in melt inclusions, and their associated bubbles, were analyzed using laser Raman spectrometry. The compositions of the whole-rock eruption products are basaltic and esite that slightly sifting of SiO2 and K20 composition to previous eruption products, whereas the melt inclusions in pyroxene, plagioclase and hornblende are dacite to rhyolite, likely trapped mainly during late stages of crystallization of the magma. The most high volatile content in the melt inclusion are CO2 and H2O which appear strong Raman peaks for CO2 in the gas bubbles indicate abundances on high levels of CO2. Interpretation of result from a long-term flux of CO2 into the reservoir, either derived from more mafic magmas at depth or from reaction of magma in the reservoir with limestone and it may indicate that volcanic outgassing rates far exceed the amounts that can be supplied magmas.

关键词： Merapi melt inclusions geochemistry explosive eruption.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：