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The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton:Implication for Palaeozoic subducted oceanic slab-mantle interaction

The origin of Mengyin and Fuxian diamondiferous kimberlites ...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Hong-Fu Zhang~(a,*),Mei-Fu Zhou~b,Min Sun~b,Xin-Hua Zhou~a a State Key Laboratory of Lithospheric Evolution,Institute of geology and geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,PR China b department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong

Concentrations of major,trace,and platinum-group element(PGE)compositions were determined for a suite of the Early Palaeozoic(ca.4.5 Ma)Mengyin and Fuxian diamondiferous kimberlites from the eastern North China Craton to constrain the petrogenesis of these rocks and thus the mantle processes involved in their *** the Chinese kimberlites are broadly similar to the kimberlites of South Africa(McDonald et al.,1995),there are significant compositional differences between the Mengyin and the Fuxian *** Mengyin kimberlites are more refractory(Mg#>87,Ni=1207-1786,Cr=1991- 4.24.and more strongly enriched in LREE((La/Yb)=265-517),but have lower Pd/Ir ratios(1.26- 2.08)than those of the Fuxian *** Mengyin kimberlites possess primitive,mantle-like Sr-Nd isotopic *** features suggest that the Mengyin kimberlites formed from a mixture of carbonated asthenosphere and lithospheric keel with a minor contribution from a previously subduction-dehydrated oceanic *** contrast,the Fuxian kimberlites are less refractory(Mg#=80-87,Ni=971-14.1, Cr=14.3-2285),less enriched in LREE((La/Yb)=4.-173)and have higher Pd/Ir ratios(1.59-4.24.. Their lowerεNd values(εNd～-2.3)and large variations in Sr isotopic compositions suggest significant involvement of hydrothermally-altered and previously subduction-dehydrated oceanic ***, we consider that the formation of the two kimberlites was related to the previously dehydrated subduction of an oceanic slab beneath the North China Craton in the *** subduction of Palaeo-Tethyan oceanic lithosphere in the south and/or subduction of the Mongolian Ocean lithosphere in the north could have initiated the destabilization of the eastern North China *** released from the previously dehydrated subducted slab migrated and concentrated in regions of thermally perturbed asthenosphere and at the base of lithosphere keel,which in turn triggered the generation of kimberlitic magmas by a small degree o

关键词： PGE Kimberlite Subducted oceanic slab-mantle interaction North China Craton

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参加第27届国际地质大会的感受

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西北大学学报(自然科学版) 1985年第3期 4-10页

作者：霍世诚西北大学地质系

27届国际地质大会是1984.8月4.至14.在苏联首都莫斯科举行的,会议地点主要是莫斯科大学和苏联外贸中心,开幕和闭幕式都在克里姆林宫.参加会议的人数多达5600,来自112个国家。这届大会分为地层、古生物、第四纪地质、沉积学、前寒武... 详细信息

27届国际地质大会是1984.8月4.至14.在苏联首都莫斯科举行的,会议地点主要是莫斯科大学和苏联外贸中心,开幕和闭幕式都在克里姆林宫.参加会议的人数多达5600,来自112个国家。这届大会分为地层、古生物、第四纪地质、沉积学、前寒武纪地质、海洋地质、构造地质、地球物理、岩石学、矿物学、地球化学、金属矿床学、油气地质、固体燃料矿床、非金属矿床、水文地质、工程地质、遥感、比较行星学、数学地质、地质学史和地质教育等22个学科组。每个学科组的工作可按主题分别在各组进行,也有各相关组之间的讨论.地层组的主题有:地层学的原理及方法,地层学与地质年代学,地层单位的准确限度及地理稳定性,地层界限的性质及类型,显生宙地层问题。地层学的组间讨论有不同相和生物地理区沉积的对比,文德系(前寒武最后的系),前寒武系与显生宙的界限,二迭系,胞粉地层学。古生物组的主题有:早期的生物,生态系统的古生态学及演化,脊椎动物的起源及分布,作为系统发育分析钥匙的古构造与结构形态学,化石的微细构造及化学。古生物的组间讨论有地球历史中的基本生物变化与化石群的灭绝,迭层石,类迭层石的微小生物和灰藻,植物群的生成与大陆的历史,古植物群分区的起源及演化,寒武纪动物群、植物群的演化、迁移与区划,牙形刺的生物学及生物地层学。考虑到世界地层工作的进展,作者提出了加强与我国地层有关的古地理、同位素、磁性的研究。至于我国古生物的研究则应特别注意于早期的生物,古生态与进化论,寒武纪植物群,化石的微细构造与化学,牙形刺的生物学及生物地层学等。

关键词：生物地层学植物群牙形刺动物群古生态学生物地理区国际地质大会地球历史迭层石燃料矿床

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天然气水合物的特征及环境意义

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上海地质 2000年第2期 24-28页

作者：徐国强吕炳全王红罡同济大学海洋地质与地球物理系上海200092

天然气水合物是由甲烷等气体和水分子组成的类冰状的固态物质,主要分布在极地永冻层和外大陆架边缘的海洋沉积物中。赋存在天然气水合物中的碳约为10^(13)吨,相当于全球其他化石燃料中碳含量的两倍。由于天然气水合物处于亚稳定状态,因... 详细信息

天然气水合物是由甲烷等气体和水分子组成的类冰状的固态物质,主要分布在极地永冻层和外大陆架边缘的海洋沉积物中。赋存在天然气水合物中的碳约为10^(13)吨,相当于全球其他化石燃料中碳含量的两倍。由于天然气水合物处于亚稳定状态,因此天然气水合物既可作为21世纪潜在的能源资源,又可以非稳定状态导致海底滑塌和滑坡等地质灾害,并可通过释放甲烷影响全球气候。

关键词：天然气水合物能源资源海洋灾害海洋沉积物

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Re-Os dating of the Kalatongke Cu-Ni deposit,Altay Shan,NW China,and resulting geodynamic implications

Re-Os dating of the Kalatongke Cu-Ni deposit,Altay Shan,NW C...

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中国科学院地质与地球物理研究所2007学术年会

作者： Chunming Han~(a,*),Wenjiao Xiao~a,Guochun Zhao~b,Wenjun Qu~c,Andao Du~c * State Key laboratory of Lithospheric Evolution,Institute of geology and geophysics,Chinese Academy of Sciences,Beijing,100029,China b department of Earth Sciences,The Uttiversity of Hong Kong,Pokfulam Road,Hong Kong,China c National Research Center of Geoanalysis,Beijing,100037,China

Kalatongke is a large Cu-Ni deposit in the southern part of the Altay orogenic belt,northwestern *** and osmium isotopic analyses of Ni- and Cu-bearing sulfide minerals from the deposit have been used to determine the timing of mineralization, the source of osmium,and,by inference,the source of ore *** ore samples have Os and Re concentrations varying in the ranges 0.29 to 3.07 ppb and 6.605 to 61.10 ppb,*** of these data yield a six-point isochron with an age of 305±15 *** initial

关键词： Re-Os isotopic dating Cu-Ni deposit Geodynamics Kalatongke Altay China

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Quantitative P-T-X constraints on orthopyroxene-bearing high-pressure granulites in felsic-metapelitic rocks:evidence from the Huangtuling granulite,Dabieshan Orogen

Quantitative P-T-X constraints on orthopyroxene-bearing high...

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中国科学院地质与地球物理研究所2008学术年会

作者： Y.CHEN,~1 K.YE,~1 J-B.LIU~1 AND M.SUN~2 1 State Key Laboratory of Lithospheric Evolution,Institute of geology and geophysics,Chinese Academy of Sciences,Beijing 100029,P.O.Box 9825,China 2 department of Earth Sciences,University of Hong Kong,Hong Kong,China

High-pressure granulites are generally characterized by the absence of ***, orthopyroxene is reported in a few high-pressure,felsic-metapelitic granulites,such as the Huangtuling felsic high-pressure granulite in the North Dabie metamorphic core complex in east-central China, which rarely preserves the high-pressure granulite facies assemblage of garnet + orthopyroxene + biotite + plagioclase + K-feldspar + *** investigate the effects of bulk-rock composition on the stability of orthopyroxene-bearing,high-pressure granulite facies assemblages in the NCKFMASHTO (NaO-CaO-KO-FeO-MgO-AlO-SiO-HO-TiO-FeO) system,a series of P-T-X pseudosections based on the melt-reintegrated composition of the Huangtuling felsic high-pressure granulite were *** demonstrate that the orthopyroxene-bearing,high-pressure granulite facies assemblages are restricted to low X[AlO/(NaO + CaO + KO + FeO + MgO + A1O)0.85]felsic-metapelitic rock *** study also reveals that the X values in the residual felsic-metapelitic,high-pressure granulites could be significantly reduced by a high proportion of melt *** suggest that orthopyroxene-bearing,high-pressure granulites occur in residual overthickened crustal basement under continental subduction-collision zones and arc-continent collision belts.

关键词： high-pressure granulite NCKFMASHTO system orthopyroxene P-T-X pseudosections

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A Tectonic Escape Model for the Formation of Sedimentary Basins in the Yangzhou Block of theLower Yangtze Region,Eastern China

A Tectonic Escape Model for the Formation of Sedimentary Bas...

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中国科学院地质与地球物理研究所2002学术年会

作者： Y.J.Shang~a,Z.Q.Yue~b,B.D.Xia~c,G.H.Li~a a Engineering Geomechanics Laboratory,Institute of geology and geophysics, Chinese Academy of Sciences,Beijing 100029,P.R.China b department of Civil Engineering.The University of Hong Kong,Hong Kong,P.R.China c department of Earth Sciences,Nanjing University,Nanjing 210008,P.R.China

This paper presents a tectonic escape model for the formation of sedimentary basins in the Yangzhou Block of the Lower Yangtze Region,Eastern *** sedimentary basins are identified in which the Pukou Formation of the Upper Cretaceous has been *** south to north,the nine sedimentary basins are named:Wangjing,Qiangshan,Wuwei,Nanxuan, Changzhou,Jurong,Nanjing,Quanjiao and Subei *** form a wedge-shape fragment(the Yangzhou Block) occupying an area of 100,000 km in the Lower Yangtze *** two side boundaries of the Yangzhou Block are the strike-slip Tanlu Fault and the strike-slip Quangjiao-Xiangshui Fault on the northwest and the strike-slip Qingyang-Nantong Fault on the *** wide end of the wedge faces the Southern Yellow Sea in the northeast and the narrow end contacts the Dabie Block in the southwest. During the Early Mesozoic,collision between the Yangtze Block and the North China Block resulted in the formation of the Qinling-Dabie Orogenic Belt and caused the Lower Yangtze Region to become a foreland basin with many strike-slip *** the Late Mesozoic,wide spread extension in Eastern China and shortening in Qin-ling/Dabie Shan and in the Huaying Shan region resulted following establishment of an Andean-type arc margin to the east of the Southern Yellow Sea area,when"Greater Japan"collided with ***,the wedge-shaped Yangzhou Block escaped tectonically toward the northeast and formed distinctive geological features in nine sedimentary basins during Pukou time in the Late *** geological features are reflected in basin spatial distributions,basin geometries,sedimentary facies,sediment thicknesses, sedimentary environments,and the petrology of fanglomerates and *** basins are part of a large population of arc-crestal rifts formed on top of that Andean arc. The proposed tectonic escape model could be useful in petroleum exploration and mining in the region.

关键词： Late Cretaceous Sedimentary Basins Strike-slip fault Tectonic escape Lower Yangtze Region

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NORMAL-SLIP ALONG THE NORTHERN ALTYN TAGH FAULT, NORTH TIBET

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地学前缘 2000年第S1期7卷 237-238页

作者： Yin An 1, George Gehrels 2, Chen Xunhua 3, Wang Xiao\|Feng 3, T. Mark Harrison 1, Shen Jie 1[WT5,5”BX](1 department of Earth and Space Sciences and Institute of geophysics and Planetary Physics, University of California, Los Angeles, CA 90095\

The east\|west striking Northern Altyn Tagh Fault, about 24.km long between Bashkaogong (90°E, 39°25′N) and Lapeiquan (92°15′E, 39°25′N), was previously mapped as a north\|dipping thrust, juxtaposing late Archean\|Mesoproterozoic gneisses in the hanging wall over Paleozoic volcanics, plutons, turbidite, and melange complexes in the footwall. In order to estimate the total magnitude of slip along the Cenozoic Altyn Tagh fault, we conducted geologic mapping along four traverses across the Jinyan Shan where the fault lies. Our field observations suggest that the fault is south\|dipping, with dip angles varying from 4.° in the west. The eastern fault zone exhibits mylonitic fabrics, whereas the western fault zone is characterized by cataclastic deformation. Kinematic indicators in the ductily deformed mylonitic shear zone consistently show a top\|to\|the\|south sense of shear, suggesting that the Northern Altyn Tagh fault is a south\|dipping normal fault, not a north\|dipping thrust.. The ductile shear zone is typically 30～4.m thick, consisting of highly sheared metasediments (pelite and marble), granites, and granitic *** latter are systematically cut by small\|scale, south\|dipping ductile normal faults with displacements between 10s of cm to several meters, forming spectacular asymmetric boudinages in the sheared meta\|pelite *** minimum displacement along the detachment is about 20km, as measured by the north\|south width of the exposed footwall gneisses. We renamed the Northern Altyn Tagh Fault in the Jinyan Shan region as the Lapeiquan detachment fault to avoid confusion with other east\|west trending Cenozoic faults to the west along the northern edge of the Altyn Tagh range (e.g., the Cenozoic Jianglisai fault near Qiemo), collectively known as the Northern Altyn Tagh fault system (see Cowgill et al., geology,in press). The lower age bound of the Lapeiquan fault is Ordovician, as the fault cuts Ordovician volcanics and plut

关键词： detachment fault Northern Altyn Tagh Fault Tibet

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ICP中钨基体对三十种元素的光谱干扰

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分析化学 1989年第11期17卷 1031-1032页

作者：万家亮金泽祥华中师大化学系武汉地质学院应化系武汉

本文利用高分辨能力的JY38单道光谱仪,在ICP中系统地研究了钨基体对30种常见元素灵敏线的光谱干扰。为钨和钨化合物中元素 (Ag、Al、As、B、Ba、Be、Bi、Ca、Cd、Co、Cr、Cu、Fe、Hg、La、Mg、mn、Mo、Nb、Ni、P、Pb、Se、Si、Sn、Ta、T... 详细信息

本文利用高分辨能力的JY38单道光谱仪,在ICP中系统地研究了钨基体对30种常见元素灵敏线的光谱干扰。为钨和钨化合物中元素 (Ag、Al、As、B、Ba、Be、Bi、Ca、Cd、Co、Cr、Cu、Fe、Hg、La、Mg、mn、Mo、Nb、Ni、P、Pb、Se、Si、Sn、Ta、Ti、Th、V、Zn) 分析线的选择提供了依据。

关键词： ICP-AES 钨光谱干扰

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Geochronology of source materials from high-pressure and ultrahigh-pressure metamorphic rocks in Jurassic sedimentary rocks of Hefei Basin

Geochronology of source materials from high-pressure and ult...

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中国科学院地质与地球物理研究所2003学术年会

作者： LI Renwei~1,SANG Haiqing~1,ZHANG Renhu~1, CHU Zhuyin~1,LI Shuangyin~2,JIN Fuquan~2 & JIANG Maosheng~1 1.Institute of geology and geophysics.Chinese Academy of Sciences, Beijing 100029.China `2.department of Resource and Environment Sciences.Hefei Industrial University.Hefei 230026.China

In this report,it is proven through stable isotopic geoehronological study that for the Jurassic sedimentary rocks in the Dushan area of Anhui Province,the source materials derived from high-pressure and ultrahigh-pressure metamorphic rocks are the products of subduction and exhumation of the Yangtze plate under the North China plate during the Triassic *** cobble of high-pressure or ultrahigh-pressure metamorphic rock in the Fenghuangtai Formation of Hefei Basin has Rb-Sr isotopic isochron age of phengite,apatite and whole rock,232.1±2.1 Ma(MSWD= 0.59).Plateau ages of Ar/Ar age spectra of detrital phengites in the Sanjianpu and Fenghuangtai formations are concordant,and they are 216.5±0.6 Ma and 217.4.1.3 Ma, respectively.

关键词： Dabie orogenesis Hefei Basin source materials high-pressure and ultrahigh-pressure metamorphic rocks isotopic ages

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滦河口区沉积物中元素的分布和环境的关系

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海洋通报 1983年第2期 60-70页

作者：周福根同济大学海洋地质系

滦河横贯河北省北部,全长1200公里,流域面积约4.000平方公里,年平均迳流量为4..5亿立方米,每年把约1900万吨泥沙输入渤海,平均含沙量仅次于黄河而高于长江。大量泥沙堆积于河口外的浅海中,形成扇状三角洲。同时在河口外海域的东和东北... 详细信息

滦河横贯河北省北部,全长1200公里,流域面积约4.000平方公里,年平均迳流量为4..5亿立方米,每年把约1900万吨泥沙输入渤海,平均含沙量仅次于黄河而高于长江。大量泥沙堆积于河口外的浅海中,形成扇状三角洲。同时在河口外海域的东和东北强风浪(最大风速可达20米/秒)的作用下,沿岸形成了一系列的滨岸沙坝,类似墨西哥湾西岸的里奥·格兰德(Rio Grande)河口。

关键词：曹妃甸周福沙坝河床地形沉积物样品浅滩水动力滨岸富集有孔虫权系数地质系河槽河床

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