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Chinese Science Bulletin 2002年第13期47卷 1119-1124页

作者： chu xuelei, sun min & zhou meifuinstitute of geology and geophysics, Chinese {2. of Sciences,{3., china Key Laboratory of mineral Resources, Institute of geology and geophysics, Chinese {2. of Sciences, beijing 100101, china Department Institute of geology and geophysics Chinese Academy of Sciences Beijing China Key Laboratory of mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China Department of Earth Sciences The University of Hong Kong Hong Kong China

By comparing PGE patterns of sulfide ores with that of basic-ultrabasic dikes occurring in the Dajing Cu-polymetallic deposit, we discover that there are similar positive slopes between the basic-ultrabasic dikes and the black ores composed mainly of sphalerite and galena, reflecting affinity of their source. The PGE patterns of the yellow ores composed basically of chalcopyrite, arsenopyrite and pyrite are actually different. One is close to the pattern of the mantle 1herzolite, and others resemble the pattern of the basic rocks. However, the concentrations of Ru are higher in the yellow ores, reflecting that sulfur attains or approaches saturation in their parent magma. The PGE characteristics of ores and dikes show that the magmas derived from the deep of crust and the metallogenic elements were supplied mainly by growth material of the crust. In addition, the mantle-derived magma also offered some elements.

关键词： Da Hinggan area polymetallic deposit PGE pattern hypomagma.

^(2.7)Pb/^(2.6)Pb determination of zircons by laser probe-inductively coupled plasma mass spectrometry

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Chinese Science Bulletin 1998年第23期43卷 2008-2012页

作者： YAN Xin\+1, chu Zhuyin\+1, sun {2.\+2. XU Ping\+1 and zhou Xinhua\+11. Institute of geology, Chinese academy of Sciences, beijing 10002., china 2. Department of Geosciences, Hong Kong University, Hong Kong, china Institute of geology Chinese Academy of Sciences Beijing China Department of Geosciences Hong Kong University Hong Kong China

Laser probe_inductively coupled plasma mass spectrometry (LP_ICP_MS) was used to determine 2.7 Pb/ 2.6 Pb ratios in single zircon grains. A Nd∶YAG laser operating at 1 064 nm and a Fisons_VG PQII Turbo ICP_MS were employed. For the known zircons, the 2.7 Pb/ 2.6 Pb results of LP_ICP_MS are close to the thermal ionization mass spectrometry (TIMS) results. The spatial resolution of this method is 40-50 μm and the sensitivities for lead isotopes are about 3.0-400 cps/ppm. The precision of 2.7 Pb/ 2.6 Pb ratio is 0.3.-4% and depends on the lead concentration of the sampling pits. LP_ICP_MS provides a simple, rapid and economic method for zircon 2.7 Pb/ 2.6 Pb determination.

关键词： laser probe_inductively coupled plasma mass spectrometry zircon microanalysis.

Ultramafic xenoliths in Mesozoic diorite in west Shandong Province

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Science china Earth Sciences 2004年第6期47卷 489-499页

作者： CHEN Lihui1,2.& zhou Xinhua2.1.The Key Laboratory of Orogenic Belts and Crustal Evolution,{3.istry of Education,{2. and School of Earth and Space Sciences,Peking University,beijing 100871,{2. 2.Institute of geology and geophysics,Chinese academy of Sciences,beijing 10002.,{2. Correspondence should be addressed to Chen Lihui(email: lihui_chen@***) 1. The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China and School of Earth and Space Science Peking University 100871 Beijing China 2. Institute of geology and geophysics Chinese Academy of Sciences 100029 Beijing China

Ultramafic xenoliths are common in Tietonggou intrusion, Laiwu, Shandong Prov-ince. Peridotite xenoliths develop two-stage metasomatism popularly: (i) The early metasoma-tism is characterized by intergranular clinopyroxene and phlogopite; (ii) The later metasomatism is characterized by orthopyroxene veins with a few plagioclases and amphiboles. These ul-tramafic xenoliths are thought to be mostly from the crust-mantle transitional zone on the basis of their combination, mineral chemistry, equilibrium temperature, and metasomatic characteristics. Major elements, rare earth elements, and Sr-Nd isotopic composition of the ultramafic xenoliths indicate that there is a petrogenetic relationship between the silica-enriched xenoliths and their host diorites. We propose that such silica enrichment might be an indicator of melt-rock interac-tions in the Mesozoic lithosphere beneath western Shandong.

关键词： ultramafic xenoliths, crust-mantle transitional zone,metasomatism, Tietonggou intrusion, Laiwu.

Simulation of the impact of the South to North Water Transfer Project on groundwater in the beijing plain

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Simulation of the impact of the South to North Water Transfe...

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： YANG YONG~1,LI GUO-min~1,DONG YAN-HUI~1,LI minG~1, YANG JIANG-QING~2.{2. DONG~3.& YANG ZHONG-SHAN~3.1 Institute of geology and geophysics Chinese academy of sciences,beijing 10002.,china 2.ministry of Water Resources,Department of Hydrological Analysis,beijing 100053.china 3.beijing Hydraulic Center,beijing 10003.,china

In the beijing plain,the groundwater level has been gradually descending due to extensive groundwater pumping in consecutive drought *** the implementation of the South to North Water Transfer Project, an opportunity has been provided for restoration of groundwater under over-exploitation *** the basis of hydrogeology conditions of the beijing plain,as well as the high performance parallel computing platforms,a numerical groundwater flow model was *** results show that several obvious depression cones of groundwater have been formed because of the rapid decline of groundwater levels in the beijing plain in recent years. After the implementation of the South to North Water Transfer Project and due to the restrictions on groundwater exploitation,the area of the cone of depression will be reduced to different degrees,and the centre level of depression cone will rise *** is a benefit to relieve water shortage and control the development of land subsidence and the deterioration of the ecological environment.

关键词： South to North Water Transfer Project groundwater dynamic change beijing plain numerical model parallel computing

Secular evolution of the lithosphere beneath the eastern North china Craton:Evidence from Mesozoic basalts and high-Mg andesites

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Secular evolution of the lithosphere beneath the eastern Nor...

中国科学院地质与地球物理研究所2.03.术年会

作者： HONG-FU ZHANG,~(1,*) min sun,~2.XIN-HUA {2.,~1 MEI-FU {2.,~2.WEI-minG FAN,~1 and JIAN-PING ZHENG~3.1 Laboratory of Lithosphere Tectonic Evolution,Institute of geology and geophysics,Chinese academy of Sciences, P.O.Box 982.,beijing 10002.,P.R.{13. 2.Department of Earth Sciences,The University of Hong Kong,Pokrulam Road,Hong Kong,P.R.{13. 3.Faculty of Earth Sciences,{13. University of Geosciences,Wuhan 43.074,P.R.{13.

Geochemical and isotopic data from Mesozoic lavas from the Jianguo,Niutoushan,Wulahada,and Guancaishan volcanic fields on the northern margin of the North china Craton provide evidence for secular lithospheric evolution of the *** lavas are alkaline basalts with LILE- and LREE-enrichment ((La/Yb)=12.2.13.2. and MORB-like Sr-Nd-Pb isotopic ratios((Sr/Sr)3.9-4.8;(Pb/ Pb)≈18).Niutoushan basalts are similar but show evidence of olivine *** lavas are high-Mg andesites(Mg#～67) with EM1 Sr-Nd-Pb isotopic *** data suggest that the basalts originated from MORB-type asthenosphere whereas the high-Mg andesites were derived an EM1 mantle source,i.e.,a refractory lithospheric mantle modified by a previously subducted *** result, combined with the available data of the Mesozoic basalts from the southern portion of the NCC(Zhang et al., 2.02.,manifests a vast secular evolution of the lithospheric mantle beneath the eastern NCC from the Paleozoic refractory continental lithosphere to this Mesozoic modified *** with the cratonic margin,the lithospheric mantle beneath the center of the craton was less extensively modified, implying the secular evolution was related to the subduction processes surrounding the ***,we suggest that the interaction of the slab-derived silicic melt with the old refractory lithospheric mantle converted the Paleozoic cratonic lithospheric mantle into the late Mesozoic fertile mantle,which was also different from the Cenozoic counterpart.A geodynamic model is proposed to illustrate such a secular lithosphere evolution.

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High temperatures and high pressures Brillouin scattering studies of liquid H2.+CO2.mixtures

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High temperatures and high pressures Brillouin scattering st...

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Junfeng Qin,~1 min Li,~2.un Li,~1Rongyan Chen,~2.henhao Duan,~1Qiang {3.,~2.Fangfei Li,~(2.a))and Qiliang Cui~2.1 Key Laboratory of Earth’s Deep Interior,Institute of {2. and geophysics,Chinese academy of Sciences,beijing 1002.,china 2.State Key Lab of Superhard Materials,Jilin University,Changchun 13.012.china

The Brillouin scattering spectroscopy studies have been conducted in a diamond anvil cell for a liquid mixtures composed of 95 mol%HO and 5 mol%CO under high temperatures and *** sound velocity,refractive index,density,and adiabatic bulk modulus of the HO + CO mixtures were determined under pressures up to the freezing point at 2.3.453.and 575 K. It is found from the experiment that sound velocities of the liquid mixture are substantially lower than those of pure water at 575 K,but not at lower *** presented an empirical relation of the density in terms of pressure and *** results show that liquid HO+CO mixtures are more compressible than water obtained from an existing equation of state of at 453.and 575 K.

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Petrology and geochemistry of Zijinshan alkaline intrusive complex in Shanxi Province,western North china Craton:Implication for magma mixing of different sources in an extensional regime

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Petrology and geochemistry of Zijinshan alkaline intrusive c...

中国科学院地质与地球物理研究所2.07学术年会

作者： Jifeng Ying~(a,*),Hongfu Zhang~a,min sun~b,Yanjie Tang~a, Xinhua {2.~a,Xiaoming Liu~c a State Key Laboratory of Lithospheric Evolution,Institute of geology and geophysics,Chinese academy of Sciences, P.O.Box 982..beijing 10002.,china b Department of Earth Sciences,The University of Hong Kong,Porkfulam road,Hong Kong,china c Department of geology,Northwest University,Xi’an 710069,china

In situ zircon U-Pb ages and Hf isotopic compositions and whole rock geochemical and Sr-Nd-Pb isotopic data are presented for the Zijinshan alkaline intrusive complex from the Shanxi Province,western North china *** rocks dominate the complex with the monzonite occurring in the outermost and pseudoleucite phonolitic breccia in the *** intrusion took place 12. Ma ago with the earliest emplacement of monzonite and the termination of cryptoexplosive pseudoleucite phonolitic *** rocks from this complex show LREE enrichment and HFSE depletion and exhibit enriched to depleted Sr-Nd isotopic *** presence of inherited zircons and enriched Hf isotopic compositions in zircon rims,along with the enriched whole rock Sr-Nd isotopic compositions,indicate that the monzonite was formed through the mixing of lithospheric mantle-derived magma with lower crustderived *** diopside syenite and nepheline-bearing diopside syenite are more depleted than the monzonite in terms of the Sr and Nd isotopes,together with their very high concentrations of LILE,we proposed that they originated from a mixed mantle source of enriched lithospheric mantle and depleted *** nepheline syenite has very low concentrations of MgO,Ni,Cr, suggesting that the magma underwent significant crystal *** most depleted Sr and Nd isotopic compositions ((Sr/Sr)=0.703.-0.7042.ε(t)=-0.2.0.3. among all rock types indicate a great contribution of asthenosphere to the nepheline *** Zijinshan complex and its related crust-mantle interaction occurred in an extensional environment which resulted in continuously asthenospheric *** an extensional environment might have been developed during the post-orogenic stage of the Late Paleozoic amalgamation of North china Craton with Mongolian continents and subsequent Mongol-Okhotsk ocean closure.

关键词： Alkaline complex Crust-mantle interaction Monzonite Nepheline syenite North china Craton

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

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The origin of Mengyin and Fuxian diamondiferous kimberlites ...

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Hong-Fu Zhang~(a,*),Mei-Fu zhou~b,min {2.~b,Xin-Hua zhou~a a State Key Laboratory of Lithospheric Evolution,Institute of geology and geophysics,Chinese academy of Sciences,P.O.Box 982.,beijing 10002.,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.465 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=12.7-1786,Cr=1991- 42.4)and more strongly enriched in LREE((La/Yb)=2.5-517),but have lower Pd/Ir ratios(1.2.- 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=971-1411, Cr=1483.2.85),less enriched in LREE((La/Yb)=45-173.and have higher Pd/Ir ratios(1.59-4.2.). 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

Highly heterogeneous Late Mesozoic lithospheric mantle beneath the North china Craton:evidence from Sr-Nd-Pb isotopic systematics of mafic igneous rocks

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Highly heterogeneous Late Mesozoic lithospheric mantle benea...

中国科学院地质与地球物理研究所2.04学术年会

作者： ZHANG HONG-FU~(*++),sun min~(++),{2. MEI-FU~(++),FAN WEI-minG~*, {2. XIN-HUA~* & ZHAI minG-GUO~* * Laboratory of Lithosphere Tectonic Evolution,Institute of geology and geophysics, Chinese academy of Sciences,P.O.Box 982.,beijing 10002.,P.R.china ++ Department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong

The lithospheric mantle beneath the North china Craton changed dramatically in its geophysical and geochemical characteristics from Palaeozoic to Cenozoic *** study uses samples of Mesozoic basalts and mafic intrusions from the North china Craton to investigate the nature of this mantle in Mesozoic ***-Nd-Pb isotopic data demonstrate that the Late Mesozoic lithospheric mantle was extremely *** the central craton or the Luzhong region,it is slightly Sr-Nd isotopically enriched,beneath the Taihangshan region it has an EM1 character (Sr/Sr=0.7050-0.7066;εNd(t))=-17--10),and beneath the Luxi-Jiaodong region,it possesses EM2.like characteristics(Sr/Sr up to 0.7114).Compositional variation with time is also apparent in the Mesozoic lithospheric *** data suggest that the old lithospheric mantle was modified during Mesozoic times by a silicic melt,where beneath the Luxi-Jiaodong region it was severely modified,but in the Luzhong and Taihangshan regions the effects were much less *** silicic melt may have been the product of partial melting of crustal materials brought into the mantle by the subducted slab during the formation of circum-cratonic orogenic *** Mesozoic mantle did not survive for a long time,and was replaced by a Cenozoic mantle with depleted geochemical characteristics.

关键词： Mesozoic continental lithosphere isotopes heterogeneity silicate melts

The discovery of the oldest rocks in the Kuluketage area and its geological implications

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Science china Earth Sciences 2011年第3期54卷 342-348页

作者： LONG XiaoPing YUAN Chao sun min XIAO WenJiao ZHAO Guo{2.n {3. KeFa WANG YuJing HU AiQin Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Department of Earth Sciences The University of Hong Kong Pokfulam Road Hong Kong China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Xinjiang Resources and Environment Center Urumqi 830000 China

The basement rocks in the Kuluketage area are composed predominately of tonalite-trondhjemite-granodiorite rocks, and occured mainly in Xinger and Korla. U-Pb dating of TTG gneiss near Korla yielded a late Neoarchean weighted mean 2.7Pb/2.6Pb age of 2.65 Ga, which is the oldest published age for the TTG rocks in the Kuluketage area and thus suggests that Archean terrane in the area was formed in the late Neoarchean. The Korla gneiss is much younger than the TTG rocks in the northern Altyn Tagh, eastern Tarim Craton, indicating that the oldest terrane of the Tarim Craton was exposed probably in the northern Altyn Tagh. Until late Neoarchean, the Tarim continent extends to the Kuluketage area and finally had generated a relatively large uniform Archean basement within the craton. Zircon Hf isotopic analyses of the TTG gneiss give low εHf(t) values (-5 to 1) with Paleoarchean to Mesoarchean two-stage model ages (TDM2. between 3.0 and 3.3.Ga, suggesting that the basement rocks in the northern Tarim Craton were derived dominately from partial melting of Paleoarchean to Mesoarchean juvenile crustal material. The Hf model ages, therefore, indicate that no continent crust older than 3.3.Ga existed in the Kuluketage area.

关键词： Tarim Craton Archean crustal growth zircon dating Hf isotope