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In situ determination of hafnium isotopes from rutile using LA-MC-ICP-MS

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Science China Earth Sciences 2015年第12期58卷 2134-2144页

作者： LI Yang YANG YueHeng jiao shujuan WU FuYuan YANG JinHui XIE LieWen HUANG Chao State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

The hafnium isotopic analysis using laser ablation has been widely conducted on Hf-rich minerals （zircon/baddeleyite/ calzirtite/eudialyte）, however, little work has been reported on Hf-poor （〈100 ppm） minerals. This work presents a detailed procedure of in situ hafnium isotopic analysis from ruffle using laser ablation multiple collector inductively coupled plasma mass spectrometry （LA-MC-ICP-MS）. The rutile U-Pb dating reference material JDX shows homogeneous hafnium isotopic ratios, with 176Hf/177Hf=0.281795±0.000015 （2SD, n=33） and176Lu/177Hf=0.000018±0.000004 （2SD, n=17） that suggest the possibility of using JDX as a new reference material hafnium isotopic measurement. We also measure hafnium isotopic compositions of other rutile U-Pb dating reference material （R10, Sugluk-4 and PCA-S207） and the 176Hf/177Hf values are similar to previously reported results, which confirms that we can acquire accurate and precise hafnium isotopic compositions using our developed analytical protocol. We analyzed hafnium isotopic compositions and U-Pb ages of rutile in high-temperature and ultrahigh-temperature granulites from various terrains of the Khondalite Belt from the North China Craton, combined with zircon results in the same area, suggesting that the metamorphic evolution history of the granulite is much more complicated than previously thought.

关键词： rutile hafnium isotope in situ laser ablation MC-ICP-MS khondalite

假蓝宝石(Sapphirine)的矿物学特征及其在超高温变质作用研究中的应用

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岩石学报 2019年第1期35卷 16-30页

作者：焦淑娟郭敬辉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北京100029 中国科学院大学地球与行星科学学院北京100049

假蓝宝石是Mg-Al质麻粒岩中一种特殊的高温矿物,对超高温变质作用的研究有重要的意义。本文通过对全球66个超高温麻粒岩中47个含假蓝宝石麻粒岩地区的文献调研,总结了几种最常见的含假蓝宝石矿物组合产出的结构位置和变质反应关系,以及... 详细信息

假蓝宝石是Mg-Al质麻粒岩中一种特殊的高温矿物,对超高温变质作用的研究有重要的意义。本文通过对全球66个超高温麻粒岩中47个含假蓝宝石麻粒岩地区的文献调研,总结了几种最常见的含假蓝宝石矿物组合产出的结构位置和变质反应关系,以及假蓝宝石的矿物化学特征。假蓝宝石的化学成分一般位于7∶9∶3端元左右,X_(Mg)大于0. 7,XFe_(3+)变化范围很宽,为0～0. 7。含假蓝宝石矿物组合的形成和演化指示了岩石经历的P-T轨迹。岩石中保留的假蓝宝石取代尖晶石、Grt/Opx+Sil取代Spr+Qz组合,以及随后的Spr+Crd±Opx后成合晶取代Grt/Opx+Sil组合的结构,一般可能指示了逆时针P-T轨迹中冷却和随后减压的部分;岩石中Grt/Opx+Sil/Ky或富Mg十字石反应形成Spr+Qz组合的结构可能指示了顺时针P-T轨迹中减压升温的部分。超高温变质岩不同的P-T轨迹暗示着它们的成因机制并不单一,前者可能是幔源基性岩浆底侵或增生作用的结果,后者可能与长期的热造山作用相关。

关键词：假蓝宝石超高温变质作用矿物组合矿物学特征富Mg-Al质

纯橄岩捕虏体在闪长质岩浆中的存留时间尺度:Mg-Fe扩散剖面模拟研究

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岩石学报 2011年第6期27卷 1688-1698页

作者：王艳玲钱青焦淑娟中国科学院地质与地球物理研究所矿产资源重点实验室北京100029 中国科学院研究生院北京100049 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北京100029

我国华北板块中-东部的中生代高镁闪长岩中含有许多超基性岩捕虏体。超基性岩与低镁的中酸性壳源岩浆之间发生反应,形成了高镁闪长岩现有的成分特征。然而,对超基性岩捕虏体在高温岩浆中的存留时间尺度的了解还很少。本文对鲁西铁铜沟... 详细信息

我国华北板块中-东部的中生代高镁闪长岩中含有许多超基性岩捕虏体。超基性岩与低镁的中酸性壳源岩浆之间发生反应,形成了高镁闪长岩现有的成分特征。然而,对超基性岩捕虏体在高温岩浆中的存留时间尺度的了解还很少。本文对鲁西铁铜沟和河北邯邢地区高镁闪长岩中纯橄岩捕虏体中保存的Mg-Fe扩散成分环带进行了数值模拟研究,结果表明,纯橄岩在高温(～950℃)闪长质岩浆中存留的时间尺度约为102～103年。这一研究结果有助于我们更细致地认识超基性岩与中酸性岩浆的相互作用以及高镁闪长岩的形成过程。

关键词：纯橄岩闪长质岩浆存留时间扩散华北板块

Geochronology and trace element geochemistry of zircon,monazite and garnet from the garnetite and/or associated other high-grade rocks:Implications for Palaeoproterozoic tectonothermal evolution of the Khondalite Belt,North China Craton

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Geochronology and trace element geochemistry of zircon,monaz...

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： shujuan jiao Jinghui Guo Simon L.Harley Peng Peng State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

It is well documented that the Khondalite Belt of the North China Craton formed by the collision of the Yinshan and Ordos Blocks during ca.1.95 Ga,but the onset of the post-collisional exhumation stage has not been well *** garnetite and garnet-bearing quartz-rich lens that are regarded as residue-melt phases occur occasionally in the foliated metasedimentary rocks in the Jining terrane of the Khondalite *** are free of regional gneissosity,and may be generated during the post-collisional exhumation *** U-Pb dating,monazite chemical dating and trace element analyses of zircon,monazite and garnet have been carried out on the garnetites and associated other high-grade metamorphic *** geochronological results reveal a major age group of ca.1890 Ma from the zircon grains/overgrowths and inclusion-type monazites within the garnet poikiloblasts in the *** trace elements analyses show that zircon hosted in the mantle of the garnet poikiloblasts in the garnetite contains the highest HREE and Y contents,whereas zircon hosted in the garnet rims shows higher HREE and Y contents than matrix zircon ***-type monazite in the garnetite shows higher La/Sm ratio than matrix monazite *** garnet poikiloblasts in the garnetite exhibit bell-shaped HREE and Y zoning profiles attributed to Rayleigh fractionation during their *** to garnet poikiloblasts, coronal garnet shows higher Gro,Cr and Li contents,but lower X,Sm,HREE,Zn and Zr contents and weaker Eu negative anomalies,reflecting their different formation *** on evidences from microstructural analyses,REE concentrations and patterns,HREE partition coefficients and the Tiin -zircon thermometer,it is proposed that most of the zircon grains/overgrowths in the garnetite formed coevally with garnet ***,ca.1890 Ma represents the timing of garnet poikiloblast growth during the partial melting of the *** garnet or Zn-ric

关键词： Khondalite Belt Monazite chemical dating North China Craton Trace element geochemistry Zircon U-Pb dating

扬子克拉通古元古代冷俯冲低温-高压榴辉岩相变泥质岩的发现及其大地构造意义

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地球科学 2020年第6期45卷 1986-1998页

作者：韩庆森彭松柏焦淑娟中国地质大学地球科学学院湖北省流域关键带演化重点实验室湖北武汉430074 中国地质大学地球物理与空间信息学院湖北武汉430074 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北京100029

首次报道了扬子克拉通黄陵穹隆北部崆岭杂岩古元古代水月寺混杂岩带中发现特征性石榴石-蓝晶石-硬绿泥石组合低温-高压(LT-HP)榴辉岩相变泥质岩,其变质峰期矿物组合为石榴石+蓝晶石+硬绿泥石+多硅白云母+金红石+石英.相平衡模拟计算得... 详细信息

首次报道了扬子克拉通黄陵穹隆北部崆岭杂岩古元古代水月寺混杂岩带中发现特征性石榴石-蓝晶石-硬绿泥石组合低温-高压(LT-HP)榴辉岩相变泥质岩,其变质峰期矿物组合为石榴石+蓝晶石+硬绿泥石+多硅白云母+金红石+石英.相平衡模拟计算得到一条近等温减压的顺时针型变质P-T轨迹,其峰期变质条件为571~576℃,19.2~21.8 ***-MS锆石U-Pb年代学研究获得变泥质岩中碎屑锆石核部年龄集中于2.1~2.2 Ga,变质增生边年龄为1 991±20 ***-Cld组合榴辉岩相变泥质岩原岩形成构造环境和变质峰期条件指示,其形成于较低地温梯度(d T/d P≈300°C/GPa)下的活动大陆边缘冷俯冲构造环境,进一步表明至少从古元古代开始具有"冷俯冲"构造特征的现代板块构造体制已经启动.

关键词：扬子克拉通古元古代水月寺混杂岩带低温-高压榴辉岩相石榴石-蓝晶石-硬绿泥石组合冷俯冲构造折返

UHT sapphirine granulite metamorphism at 1,93-1.92 Ga caused by gabbronorite intrusions:Implications for tectonic evolution of the northern margin of the North China Craton

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UHT sapphirine granulite metamorphism at 1,93-1.92 Ga caused...

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： JingHui Guo Peng Peng Yi Chen shujuan jiao Brian F.Windley State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geology The University of Leicester

Sapphirine granulites occur in the Daqingshan and Jining areas in the Palaeoproterozoic Khondalite belt,which divides the Western Block of the North China Craton into the Yinshan block to the north and the Ordos block to the *** sapphirine granulites in the Daqingshan area are always in contact with meta-gabbronorite dykes,implying a causal *** sapphirine-bearing rocks are divided into spinel-garnet-sillimanite-biotite-plagioclase-sapphirine gneiss,UHT sapphirine granulite, and spinel-garnet *** sapphirine granulite contains up to 30%sapphirine,garnet(30-50%), spinel(5-15%),sillimanite(5-15%),biotite(10-20%) and plagioclase(10-20%) with minor cordierite, rutile and ilmenite,but without quartz and *** chemical compositions show that the sapphirine granulites have very low SiO contents(39wt.%),high Al contents,and low *** contains very high TiO contents up to 7.6wt.%.Detailed petrographic examination of the sapphirine granulites reveals five mineral assemblages(M-M):(1) an assemblage(M) of mineral inclusions within garnet cores,(2) a matrix(peak) assemblage(M) represented by coarse-grained garnet,sapphirine, spinel,sillimanite,biotite and plagioclase,(3) sapphirine+plagioclase symplectite(M),(4) spinel + plagioclase symplectite(M),and(5) retrogressive biotite(M).The P-T stability field in the pseudosection of the NCKFMASH system indicates that the temperature of the peak UHT metamorphism of the Daqingshan sapphirine granulites is in the range 910-980℃(this compares with the peak regional metamorphic temperature of the khondalites of 700-820℃).The P-T path inferred from the P-Tstability fields of the mineral assemblages(M-M) suggests that the peakUHT metamorphism(M) was followed by nearly isothermal decompression(M and M) and later cooling(M).Field relations and geochrono-logical data suggest that the high-heat flow necessary for the UHT metamorphism of the sapphirine granulites from the Daqingshan area was provided by

关键词： Sapphirine granulite Ultrahigh-temperature(UHT) metamorphism P-T path Palaeoproterozoic Khondalite belt North China Craton

Nb掺杂浓度对SrTiO_3的电子结构和光学性能的影响（英文）

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材料科学与工程学报 2017年第2期35卷 209-214页

作者：武松闫金良焦淑娟鲁东大学物理与光电工程学院山东烟台264025

用第一性原理计算不同Nb掺杂浓度的n型Nb掺杂SrTiO_3,研究了Nb掺杂浓度对SrTiO_3的形成焓、电子结构和光学性能的影响。在Nb掺杂SrTiO_3中Nb替位Ti原子,与实验结果一致。Nb掺杂SrTiO_3的费米能级进入导带底部,Nb掺杂SrTiO_3呈现n型半导... 详细信息

用第一性原理计算不同Nb掺杂浓度的n型Nb掺杂SrTiO_3,研究了Nb掺杂浓度对SrTiO_3的形成焓、电子结构和光学性能的影响。在Nb掺杂SrTiO_3中Nb替位Ti原子,与实验结果一致。Nb掺杂SrTiO_3的费米能级进入导带底部,Nb掺杂SrTiO_3呈现n型半导体特征。从微观角度分析了Nb掺杂浓度对导电性的影响,1.11at%Nb掺杂SrTiO_3在可见光范围有强吸收,是一种有潜在应用的光催化材料;而1.67at%和2.5at%Nb掺杂SrTiO_3是潜在的透明导电材料。

关键词：半导体掺杂电学性能光学性能电子结构

New Constraints from Garnetite on the P-T Path of the Khondalite Belt:Implications for the Tectonic Evolution of the North China Craton

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New Constraints from Garnetite on the P-T Path of the Khonda...

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： shujuan jiao JINGHUI GUO SIMON L.HARLEY BRIAN F.WINDLEY STATE KEY LABORATORY OF LITHOSPHERIC EVOLUTION INSTITUTE OF GEOLOGY AND GEOPHYSICSCHINESE ACADEMY OF SCIENCES DEPARTMENT OF GEOLOGY UNIVERSITY OF LEICESTER

Garnetite pods containing >60 mol%garnet in association with garnet-bearing quartz-rich lenses are sporadically distributed in the Khondalite Belt,North China *** mineral assemblages and microtextures of garnetite occurring in quartzo-feldspathic sillimanite -garnet gneiss in the Xiaoshizi area allow definition of the metamorphic history of the *** of garnet poikiloblasts coupled with their enclosing and matrix minerals quartz,sillimanite, plagioclase,biotite,rutile and ilmenite defines an M assemblage consistent with partial melting and subsequent melt separation. Thermodynamic modeling of bell-shaped Ca zoning in garnet poikiloblasts confirms that this occurred during decompression.A retrograde M assemblage replacing M garnet or sillimanite is defined by two microdomains:coronas of Grt2 + Crd(M) where quartz is present,and Spl + Crd symplectite(M) where quartz is *** final metamorphic stage led to the coronal assemblage Grt3+Opx + Crd + Pl+ Bt(M) surrounding M garnet. Comparison of the observed mineral proportions and compositions with the predictions of phase equilibria modeling in the MCKFMASHTO system for the effective bulk compositions,in combination with Zr-in-rutile thermometry,results in the following P-T conditions for the metamorphic events:820-850℃(up to 950℃) and 8.5-9.5kbar for M;850-865℃and 7.4-7.6 kbar for M;710-720℃and 6.4-6.6 kbar for M3 The clockwise P-T path thus defined for M to M evolution is interpreted to reflect the onset of extension and exhumation of the Khondalite Belt at～1890 Ma,following the emplacement of S-type granitoids at～1920-1890 Ma and ultrahigh-temperature metamorphism at～1920 Ma that resulted from collision of the finshan and Ordos Blocks at～1950 Ma.

关键词： clockwise P-T path garnetite Khondalite Belt North China Craton pseudosection

In situ determination of hafnium isotopes from rutile using LA-MC-ICP-MS

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In situ determination of hafnium isotopes from rutile using ...

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： LI Yang YANG YueHeng jiao shujuan WU FuYuan YANG JinHui XIE LieWen HUANG Chao State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

The hafnium isotopic analysis using laser ablation has been widely conducted on Hf-rich minerals(zircon/baddeleyite/calzirtite/eudialyte),however,little work has been reported on Hf-poor(<100 ppm)*** work presents a detailed procedure of in situ hafnium isotopic analysis from rutile using laser ablation multiple collector inductively coupled plasma mass spectrometry(LA-MC-ICP-MS).The rutile U-Pb dating reference material JDX shows homogeneous hafnium isotopic ratios,withHf/Hf=0.281795±0.000015(2SD,n=33)andLu/Hf=0.000018±0.000004(2SD,n=17)that suggest the possibility of using JDX as a new reference material hafnium isotopic *** also measure hafnium isotopic compositions of other rutile U-Pb dating reference material(R10,Sugluk-4 and PCA-S207)and theHf/Hf values are similar to previously reported results,which confirms that we can acquire accurate and precise hafnium isotopic compositions using our developed analytical *** analyzed hafnium isotopic compositions and U-Pb ages of rutile in high-temperature and ultrahigh-temperature granulites from various terrains of the Khondahte Belt from the North China Craton,combined with zircon results in the same area,suggesting that the metamorphic evolution history of the granulite is much more complicated than previously thought.

关键词： rutile hafnium isotope in situ laser ablation MC-ICP-MS khondalite