检索结果-南通市图书馆

维普期刊数据库

Deep recycling of volatile elements in the mantle:Evidence from the heterogeneous B isotope in intra-plate basalts

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第6期15卷 303-320页

作者： Yan-Qing Li Hiroshi Kitagawa Chang-Qian Ma eizo nakamura Chie Sakaguchi Katsura Kobayashi Xiang-Yun Hu School of Geosciences Yangtze UniversityWuhan 430100China International Center for Isotope Effects Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Pheasant Memorial Laboratory Institute for Planetary MaterialsOkayama University at Misasa682-0193 MisasaTottoriJapan Schoole of Earth Sciences China University of GeosciencesWuhan 430074China Institute of Geophysics&Geomatics China University of GeosciencesWuhan 430074China

Volatiles in the mantle are crucial for Earth’s geodynamic and geochemical *** the deep recycling of volatiles is key for grasping mantle chemical heterogeneity,plate tectonics,and long-term planetary *** subduction transfers abundant volatile elements from the Earth’s surface into the mantle,the fate of hydrous portions within subducted slabs during intensive dehydration processes remains *** isotopes,only efficiently fractionating near the Earth’s surface,are valuable for tracing volatile recycling *** this study,we document a notably large variation inδ^(11)B values(−14.3‰to+8.2‰)in Cenozoic basalts from the South China *** basalts,associated with a high-velocity zone beneath East China,are suggested to originate from the mantle transition *** the majority exhibitδ^(11)B values(−10‰to−5‰)resembling the normal mantle,their enriched Sr-Nd-Pb isotope compositions and fluid-mobile elements imply hydrous components in their source,including altered oceanic crust and *** normalδ^(11)B values are attributed to the dehydration *** highδ^(11)B values in the basalts indicate the presence of subducted serpentinites in their mantle source.A small subset of samples with lowδ^(11)B values and radiogenic isotope enrichments suggests a contribution from recycled detrital sediments,though retaining minimal volatile elements after extensive *** findings provide compelling evidence that serpentinites within subducted slabs predominantly maintain their hydrous nature during dehydration processes in subduction *** may transport a considerable amount of water into deep mantle reservoirs,such as the mantle transition zone.

关键词： Intra-plate basalts Boron isotopes Serpentinite Volatile recycling Mantle heterogeneity

花岗岩主要造岩矿物间硼同位素分馏的初步研究

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

岩石学报 2015年第3期31卷 740-746页

作者：赵葵东蒋少涌 eizo nakamura Takuya MORIGUTI 魏海珍中国地质大学地质过程与矿产资源国家重点实验室资源学院和紧缺战略矿产资源协同创新中心武汉430074 南京大学内生金属矿床成矿机制研究国家重点实验室地球科学与工程学院南京210093 日本冈山大学(三朝)地球内部研究所地球化学和宇宙地球化学实验室

本文报道了南岭地区两个花岗岩(大东山和千里山)的全岩以及主要造岩矿物(黑云母、斜长石和石英)的硼含量和硼同位素组成。结果显示,黑云母含有最高的硼含量,斜长石次之,石英中的硼含量则非常低。花岗岩中的硼可能主要以晶格替换方式赋... 详细信息

本文报道了南岭地区两个花岗岩(大东山和千里山)的全岩以及主要造岩矿物(黑云母、斜长石和石英)的硼含量和硼同位素组成。结果显示,黑云母含有最高的硼含量,斜长石次之,石英中的硼含量则非常低。花岗岩中的硼可能主要以晶格替换方式赋存在黑云母和斜长石中,而石英中的微量硼则来自其包裹的流体包裹体。同时,黑云母具有最低的硼同位素组成,斜长石次之,而石英则具有最高的硼同位素组成。本次研究首次发现花岗岩中的主要造岩矿物间存在着较大的硼同位素分馏:大东山花岗岩中黑云母与斜长石之间存在着-9.3‰的分馏,黑云母与石英之间存在-9.9‰的分馏;千里山花岗岩中黑云母与斜长石之间存在着-6.6‰的分馏,黑云母与石英之间存在着-10.2‰的硼同位素分馏。结合镜下观察和氧同位素研究发现,造成不同矿物间这一大的硼同位素分馏的原因很可能是岩浆后期的热液蚀变作用。综合以往所发表的研究数据,得到含四次配位硼为主的硅酸盐矿物与中酸性热液流体之间的硼同位素分馏方程:1000lnα硅酸盐-流体=-11.19×(103/T[K])+5.09,该分馏是由于硼的四次配位和三次配位之间的转换引起的。

关键词：花岗岩造岩矿物硼同位素分馏系数华南

维普期刊数据库

Multistage melt/fluid-peridotite interactions in the refertilized lithospheric mantle beneath the North China Craton:constraints from the Li-Sr-Nd isotopic disequilibrium between minerals of peridotite xenoliths

在线全文

学校读者我要写书评

暂无评论

Multistage melt/fluid-peridotite interactions in the referti...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： eizo nakamura The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry Institute for Study of the Earth’s InteriorOkayama University at MisasaTottori-ken 682-0193Japan

Elemental and Li-Sr-Nd isotopic data of minerals in spinel peridotites hosted by Cenozoic basalts allow us to refine the existing models for Li isotopic fractionation in mantle peridotites and constrain the melt/fluid-peridotite interaction in the lithospheric mantle beneath the North China *** elevated Li concentrations in cpx (up to 24 ppm) relative to coexisting opx and olivine(<4 ppm) indicate that the peridotites experienced metasomatism by mafic silicate melts and/or *** mineralδLi vary greatly,with olivine(+0.7 to +5.4‰) being isotopically heavier than coexisting opx(-4.4 to -25.9%o) and cpx (-3.3 to - 21.4‰) in most ***δLi in pyroxenes are considerably lower than the normal mantle values and show negative correlation with their Li abundances,likely due to recent Li ingress attended by diffusive fractionation of Li *** exceptional samples have olivine S Li of -3.0 and -7.9‰,indicating the existence of lowδLi domains in the mantle,which could be transient and generated by meter-scale diffusion of Li during melt/fluid-peridotite *** Nd/Nd(0.5123-0.5139) and Sr/Sr(0.7018-0.7062) in the pyroxenes also show a large variation,in which the cpx are apparently lower in Sr/Sr and slightly higher in Nd/Nd than coexisting opx,implying an intermineral Sr-Nd isotopic disequilibrium. This is observed more apparently in peridotites having low Sr/Sr and high Nd/Nd ratios than in those with high Sr/Sr and low Nd/Nd,suggesting that a relatively recent interaction existed between an ancient me-tasomatized lithospheric mantle and asthenospheric melt, which transformed the refractory peridotites with highly radiogenic Sr and unradiogenic Nd isotopic compositions to the fertile lherzolites with unradiogenic Sr and radiogenic Nd isotopic ***,we argue that the lithospheric mantle represented by the peridotites has been het-erogeneously refertilized by multistage melt/fluid-peridotite interactions.

关键词： Peridotite xenoliths Lithium isotope Melt/fluid-peridotite interaction Lithospheric mantle North China Craton

Glass melt inclusion in clinopyroxene from Linqu Cenozoic basalt,Shandong Province,China

在线全文

cnki会议

学校读者我要写书评

暂无评论

Glass melt inclusion in clinopyroxene from Linqu Cenozoic ba...

中国科学院地质与地球物理研究所2006学术年会

作者： eizo nakamura Ishikawa Akira Institute for Study of the Earth’s Interior Okayama University at MisasaTottori 682-0193Japan

Cenozoic basalts from the Linqu County,Shandong Province,China entrain some clinopyroxene crystals,of which many contain abundant glass melt *** melt inclusions are extremely irregular in shape with most grain sizes in a range of 10 50μm and coexist with low-Mg# olivines,labradorites and Ca-rich potassium ***-situ major and trace element analyses show that the glass melt inclusions are high in alkalis(Na2O+K2O > 10 wt%),SiO2(>54 wt%),CaO and FeO(>4 wt%),but low in MgO(Mg# 2),thus having phonolitic *** compositional features of clinopyroxene crystals,glass melt inclusions and their coexistent minerals suggest that these melt inclusions were exotic melts in clinopyroxenes trapped prior to their entrainment in the host *** discovery of these melt inclusions provides a new approach to further investigating the evolution of Mesozoic lithospheric mantle beneath the southeastern North China Craton.

关键词： Linqu Cenozoic basalt clinopyroxene glass melt inclusion crustal source

Transformation of Subcontinental Lithospheric Mantle through Peridotite-Melt Reaction:Evidence from a Highly Fertile Mantle Xenolith from the North China Craton

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transformation of Subcontinental Lithospheric Mantle through...

中国科学院地质与地球物理研究所2007学术年会

作者： eizo nakamura KATSURA KOBAYASHI The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry Institute for Study of the Earth’s Interior Okayama University at MisasaTottori 682-0193Japan

A highly fertile mantle xenolith entrained in the Upper Cretaceous Daxizhuang basalt,Shandong Province,China provides petrological evidence for reaction between basaltic melt and refractory peridotite in Mesozoic lithospheric mantle beneath the eastern North China *** xenolith is zoned with a Iherzolite core,a sheared wehriite mande,and a reaclant *** Iherzolite has a medium-grained granular texture and contains olivine,orthopyroxene,clinopyroxene,and spinel with low Mg# values(≤87).This is the lowest value observed globally in mantle xenoliths entrained in both kimberlites and basalts from old cratons,but is close to low-Mg# spinel lherzolites entrained in adjacent region of the eastern North China *** wehriite mantle shows clear orientation and foliation of constituent olivine and *** reactant rim displays a symplectite texture of fine-grained olivine,clinopyroxene,and spinel,and is characterized by LREE-enriched *** is lacking from the sheared mantle and reactant *** zoning and systematic core-rim variations in major and trace elements of the constituent minerals demonstrate the occurrence of the refertilization through the melt-peridotite reaction in the *** reaction may have produced the low-Mg# peridotite from a high-Mg# protolith and could be an important mechanism for the change of the subcontinental lithospheric mantle from a Paleozoic refractory mantle to a Late Mesozoic fertile mantle.

关键词：

山东临朐新生代玄武岩携带的单斜辉石晶体中玻璃质熔体包裹体

在线全文

cnki会议

学校读者我要写书评

暂无评论

科学通报 2006年第13期51卷 1558-1564页

作者：张宏福 eizo nakamura 张瑾 Ishikawa Akira 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室 Institutefor Studyof the Earth’sInterior Oka-yama Universityat MisasaTottori682-0193Japan

山东临朐新生代玄武岩携带有较多的单斜辉石晶体,这些单斜辉石中发现存在大量玻璃质熔体包裹体.玻璃质熔体包裹体形状极不规则,大小多在1050μm之间,并与低镁橄榄石、拉长石和富钙钾长石共生.原位主、微量元素分析表明玻璃质熔体包裹体... 详细信息

山东临朐新生代玄武岩携带有较多的单斜辉石晶体,这些单斜辉石中发现存在大量玻璃质熔体包裹体.玻璃质熔体包裹体形状极不规则,大小多在1050μm之间,并与低镁橄榄石、拉长石和富钙钾长石共生.原位主、微量元素分析表明玻璃质熔体包裹体富碱(Na2O+K2O>10%),高硅(>54%)、钙、铁(>4%,质量分数,下同),贫镁(Mg#2),即为类似响岩质组成.单斜辉石晶体和玻璃质熔体包裹体及其共生矿物的组成特征说明这些熔体包裹体是寄主玄武岩携带前捕获的外来熔体.该熔体包裹体的发现为进一步探讨华北东南部中生代岩石圈地幔的演化过程提供了另一个新的途径.

关键词：山东临朐新生代玄武岩单斜辉石熔体包裹体地壳来源

Lithium isotopic systematics of peridotite xenoliths from Hannuoba,North China Craton:Implications for melt-rock interaction in the considerably thinned lithospheric mantle

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Lithium isotopic systematics of peridotite xenoliths from Ha...

中国科学院地质与地球物理研究所2007学术年会

作者： eizo nakamura Takuya Moriguti Katsura Kobayashi The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry Institute for Study of the Earth’s Interior Okayama University at MisasaTottori-ken 682-0193Japan

Li concentrations and isotopic compositions of coexisting minerals(ol,opx,and cpx) from peridotite xenoliths entrained in the Hannuoba Tertiary basalts,North China *** insight into Li isotopic fractionation between mantle minerals during melt-rock interaction in the considerably thinned lithospheric *** analyses of mineral separates show significant enrichment of Li in cpx(2.4-3.6 ppm) relative io olivine(1.2-1.8 ppm),indicating that these peridotites have been affected by mantle metasomatism with mafic silicate *** olivine separates(δLi～+3.3‰to +6.4‰) are isotopically heavier than coexisting pyroxenes(δLi～-3.3‰to -8.2‰in cpx,and -4.0‰to -6.7‰in opx).Such large variation suggests Li elemental and isotopic *** conclusion is supported by results from in situ SIMS analyses of mineral grains where significant Li elemental and isotopic zonations *** olivine and opx have lower Li concentrations and heavier Li isotopes in the rims than in the *** reverse correlation ofδLi with Li concentrations indicates diffusive fractionation of Li ***,the zoning patterns in coexisting cpx show isotopically heavier rims with higher Li *** positive correlation betweenδLi and Li concentrations suggests a melt mixing *** attribute Li concentration and isotope zonation in minerals to the effects of two-stage diffusive fractionation coupled with melt-rock interaction. The earliest melts may have been derived from the subducted oceanic slab with lowδLi values produced by isotopic fractionation during the dehydration of the seawater-altered *** at later stages were derived from the asthenosphere and interacted with the peridotites,producing the Li elemental and isotopic zoning in mineral *** data thus provide evidence for multiple-stage peridotite-melt interaction in the lithospheric mantle beneath the northern North China Craton.

关键词：

消减作用对日本碱性玄武岩地球化学特征的影响

在线全文

cnki会议

学校读者我要写书评

暂无评论

宝石和宝石学杂志(中英文) 1986年第4期 72-75+71页

作者： eizo nakamura 廖群安

在复杂的板块构造背景下喷出的火山岩成分可提供有关下伏地幔性质的信息。在此我们展示了日本到东亚碱性玄武岩的地球化学特征随距日本岛弧距离的系统变化。靠近日本海沟的日本东北部样品较日本西南部的样品富集K、Sr、Ba和Rb,亏损Ta、N... 详细信息

在复杂的板块构造背景下喷出的火山岩成分可提供有关下伏地幔性质的信息。在此我们展示了日本到东亚碱性玄武岩的地球化学特征随距日本岛弧距离的系统变化。靠近日本海沟的日本东北部样品较日本西南部的样品富集K、Sr、Ba和Rb,亏损Ta、Nb和Ti。两处都显示出岛弧对其成分的影响,但更向西(朝鲜和中国东北)的碱性玄武岩的化学性质就不能区别

关键词：碱性玄武岩朝鲜洋岛岛弧拉斑玄武岩地球化学特征日本

山东临朐新生代玄武岩携带的单斜辉石捕虏晶中熔体包裹体

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

山东临朐新生代玄武岩携带的单斜辉石捕虏晶中熔体包裹体

中国科学院地质与地球物理研究所2006学术年会

作者：张宏福 eizo nakamura 张瑾 Ishikawa Akira 中国科学院地质与地球物理研究所岩石圈构造演化国家重点实验室 Institute for study of the Earth's Interior Okayama University at Misasa

山东临朐新生代玄武岩携带较多的来自壳-幔过渡带的单斜辉石捕虏晶。这些单斜辉石捕虏晶中首次发现存在大量熔体包裹体即玻璃。玻璃形状极不规则,大小多在10～50μm之间。熔体包裹体与低镁橄榄岩、拉长石和富钙钾长石共生。原位主、微... 详细信息

山东临朐新生代玄武岩携带较多的来自壳-幔过渡带的单斜辉石捕虏晶。这些单斜辉石捕虏晶中首次发现存在大量熔体包裹体即玻璃。玻璃形状极不规则,大小多在10～50μm之间。熔体包裹体与低镁橄榄岩、拉长石和富钙钾长石共生。原位主、微量元素(SIMS)分析表明熔体包裹体富碱(Na2O+K2O>10 wt%),高硅(>54 wt%)、钙、铁(>4 wt%),贫镁(Mg#2),即为响岩质组成。单斜辉石捕虏晶和熔体包裹体及其共生矿物的组成特征说明这些熔体包裹体是寄主玄武岩携带前捕获的外来熔体。熔体起源于俯冲的扬子下地壳上部长英质麻粒岩。该熔体包裹体的发现为我们进一步探讨华北东南部中生代岩石圈地幔的富集和改造过程提供了另一个新的途径。

关键词：山东临朐新生代玄武岩单斜辉石捕掳晶熔体包裹体下地壳来源