Magmatic Inclusions in Phenocrystals from Andesitic Lavas,krakatau Volcano,Indonesia

来源 :Chinese Journal of Geochemistry(English Language Edition) | 被引量 : 0次 | 上传用户:zst_chengdu_xxxx
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
There is a great number of magmatic inclusions in different types of phenocrys-tals in andesitic lavas from the Krakatau volcano, Indonesia. Sequence of crystalliza-tion (from early to late) has been established for the phenocrystals on the basis of homogenization tempera-tures and chemical compositions of the magmatic inclusions: the cantral phase of plagioclase phenocrystals(An 83.2--72.6), olivine→ the intermediate phase of plagioclase phenocrystals (An 61.3), clinopyroxene,titanomagnetite→ the peripheral phase of plagioclase phenocrystals (An 54.4--42.6). The crystalliza-tion of the central phase of plagioclase phenocrystals takes place in the depth of magma chamber at about 5Kbar. High pressures and high titanium contents favor the silicate-liquid immiscibility in the magmaticinclusions of early plagioclase phenocrystals. This is typical of many andesitic lavas generated in subductionregions. There is a great number of magmatic inclusions in different types of phenocrys-tals in andesitic lavas from the Krakatau volcano, Indonesia. Sequence of crystalliza tion (from early to late) has been established for the phenocrystals on the basis of homogenization tempera-tures and chemical compositions of the magmatic inclusions: the cantral phase of plagioclase phenocrystals (An 83.2-72.6), olivine → the intermediate phase of plagioclase phenocrystals (An 61.3), clinopyroxene, titanomagnetite → the peripheral phase of plagioclase phenocrystals (An 54.4 - 42.6). The crystalliza tion of the central phase of plagioclase phenocrystals takes place in the depth of magma chamber at about 5 K bar. High pressures and high titanium contents favor the silicate-liquid immiscibility in the magmatic inclusions of early plagioclase phenocrystals. This is typical of many andesitic lavas generated in subductionregions.
其他文献
基层图书馆在推进文化创新,增强文化发展活力,让人民共享文化发展成果有着不可替代的地位。本文分析了基层图书馆事业面临的发展机遇以及基层图书馆事业在基层中的作用,并探讨了基层图书馆的可持续发展策略。
一、理论依据与工作方法(一)理论依据:沉积岩中所含陆源碎屑重矿物的成分,随着沉积物质供给区母岩的不同而变化;陆源碎屑重矿物在沉积岩层水平方向上的分布有一定的相对稳定
美国KINEMETRICS公司为开展在中国的仪器维修服务,加强与中国仪器用户之间的友谊合作,热忱为广大用户服务,并为推动强震观测技术在中国的发展,经过磋商,决定在哈尔滨国家地
6月16日下午,市国资委纪委召开系统纪检监察工作会议。市国资委党委副书记、纪委书记蒋苏平就学习贯彻市委常委、市纪委书记董君舒6月10日在推 On the afternoon of June 16
图书馆数字化是网络信息全球化下的必然产物,本文阐明了数字化以及数字图书馆的深刻内涵,从当前形势出发,分析了建设数字图书馆的必要性,并提出了数字图书馆建设的发展思路,
2,2’-联吡啶(2,2’-Dipyridyl,Dpy)是一种常用的二齿含氮配位体,它与铜等金属离子可以生成稳定的络合物.Cu-Dpy-AA的三元混配络合物也广为研究(AA为氨基酸).然而仔细审察以
随着当前经济社会的快速发展,党员干部中的一些人,思想出现了问题,行动产生了偏差,为民服务意识有所淡化,与人民群众的关系出现了裂痕,一些人甚至腐化堕落,进而严重影响到群
雪上一枝蒿(Aconitum bullatifolium Lévl.var.homotrichum W.T.Wang)是毛茛科乌头属植物.作者曾从云南省昭通县采集的雪上一枝蒿中分得两个新生物碱:一枝蒿戊素(bullatine
The Taiping-Huangshan batholith in southe ast China is a poygenetic composite granitoidconsisting of two parts. The northetn part is known as the Taiping grano
SSA-1固态存贮加速度仪是 Kineme-trics 公司强震加速度仪系列中的最新品种。采用数字固态存贮记录器,可以保证数据的完整性并便于进行数据处理。保证数据的完整性是由于采