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study on lithogeochemistry of Middle Jurassic basalts from southern china represented by the Fankeng basalts from Yongding of Fujian Province

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science china earth sciences 2006年第10期49卷 1020-1031页

作者： ZHOU Jincheng1,2, JIANG shaoyong1,2, WANG Xiaolei1,2, YANG Jinghong 1,2 & ZHANG Mengqun 3.1. state Key Laboratory of Mineral Deposit Research, nanjing university, nanjing 210093. china 2. department of {3. sciences, nanjing university, nanjing 210093. china 3. Modern Analysis Center, nanjing university, nanjing 210093. china 1. state Key Laboratory of Mineral Deposit Research Nanjing University Nanjing 210093 China 2. department of earth sciences Nanjing University Nanjing 210093 China 3. Modern Analysis Center Nanjing University Nanjing 210093 China

There exists an E-W trending Middle Jurassic volcanic zone in southern china. The Fankeng basalts in the Yongding basin of Fujian Province are considered to be a typical example. The Fankeng basalts have TiO2 contents in the range of 1.92%-3.21%. They are classified as high-Ti basalts. They also have higher total Fe (averaging FeO* = 11.09%). The Middle Jurassic Fankeng basalts from southwestern Fujian have obvious distinctive lithogeochemical features from early Cre- taceous basalts from southeastern coast of china. They have higher HFsE, such as Th, Nb, Ta, Zr and Ti. Their element ratios related with HFsE, such as Zr/Ba, La/Nb, La/Ta ,Zr/Y, Ti/Y, Ba/Nb, K/Ti and Rb/Zr are similar to those of OIB. The most samples have ε Nd(T) of-0.70-0.24, which are near chondrite. some samples have higher ε Nd(T) of ***, these basaltic magmas might be derived from depleted asthenospheric mantle. The lithogeochemical characteristics of the Fankeng basalts may be caused by interaction between asthenosphere and lithosphere at the time. The (Early-) Middle Jurassic basalts and gabbros from southeastern Hunan, southern Jiangxi and northern Guangdong provinces show similar geochemical features to those of the Fankeng basalts from the Yongding of Fujian. Occurrence of these OIB-type basalts in the area may be regarded as the petrological mark of upwelling of asthenosphere at the time. Upwelling of asthenosphere has led to tectonic extension and the formation of rifted basin in the area.

关键词： interaction between asthenosphere and lithosphere, lithogeochemistry, basalts, Middle Jurassic, southern china.

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study on the thermal stability and electrical properties of the high-k dielectrics (ZrO_2) _x(siO_2)_(1-x)

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science china(Technological sciences) 2009年第8期52卷 2222-2226页

作者： Lü shiCheng1,2, YIN Jiang1,2, XIA YiDong2,3. GAO LiGang2,3.& LIU ZhiGuo2,3.1 department of Physics, nanjing university, nanjing 210093. china 2 National Laboratory of solid sate Microstructures, nanjing university, nanjing 210093. china 3.department of Materials science and Engineering, nanjing university, nanjing 210093. china 1. department of Physics Nanjing University Nanjing 210093 China 2. National Laboratory of solid sate Microstructures Nanjing University Nanjing 210093 China 3. department of Materials science and Engineering Nanjing University Nanjing 210093 China

(ZrO2)x(siO2)1-x (Zr-si-O) films with different compositions were deposited on p-si(100) substrates by using pulsed laser deposition technique. X-ray photoelectron spectra (XPs) showed that these films remained amorphous after annealing at 800℃ with RTA process in N2 for 60 s. The XPs spectra indi- cated that Zr-si-O films with x=0.5 suffered no obvious phase separation after annealing at 800℃, and no interface layer was formed between Zr-si-O film and si substrate. While Zr-si-O films with x >0.5 suffered phase separation to precipitate ZrO2 after annealing under the same condition, and siO2 was formed at the interface. To get a good interface between Zr-si-O films and si substrate, Zr-si-O films with bi-layer structure (ZrO2)0.7(siO2)0.3.(ZrO2)0.5(siO2)0.5/si was deposited. The electrical properties showed that the bi-layer Zr-si-O film is of the lowest equivalent oxide thickness and good interface with si substrate.

关键词： high-k dielectric film pulsed laser deposition pseudo ternary alloy

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EPR studies of Mn^(2+) in the Loess Plateau of central china: Implication for variation of the East Asia summer monsoon

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Chinese science Bulletin 1998年第1期43卷 72-75页

作者： CHEN Jun\+1, JI Junfeng\+1, sU Yuanxia\+2 and LU Huayu\+3.. department of earth sciences, nanjing university,{3. 2. Center of Material Analysis, nanjing university,{3. 3. Xi’an Laboratory of Loess and Qu department of earth sciences Nanjing University Nanjing China Center of Material Analysis Nanjing University Nanjing China Xi’an Laboratory of Loess and Quaternary Geology Chinese Academy of Sciences Xi’an China

Mn 2+ EPR intensity recorded in the Chinese loess_paleosol sequence shows close correlation with magnetic susceptibility and sr content as well as the oscillation of paleoclimate. Thus Mn 2+ EPR signal can serve as an... 详细信息

关键词： paleomonsoon loess paleosol EPR signal of Mn 2+

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Ultra-microbes are the minerogenetic constructors of oceanic polymetallic nodules

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Chinese science Bulletin 1997年第8期42卷 617-624页

作者： CHEN Jianlin, ZHANG Fusheng and BIAN Lizeng1 second Institute of Oceanography, state Oceanic Administration, Hangzhou 3.0012, china 2 Center for Materials Analysis, nanjing university, nanjing 210093. china 3. {3. of earth sciences, nanjing university, nanjing 210093. china second Institute of Oceanography State Oceanic Administration Hangzhou China Centu for Materials Analysis Nanjing University Nanjing China department of earth sciences Nanjing University Nanjing China

Polymetallic nodules (mangnese nodules) are a typical kind of manganese oncolites The distribution of smooth sur-face and knobbly manganese nodules is closely related to the geological background of the mine field. A systematic study on their inner laminae structure and features suggests that they are the products of millions of years reproduction and accumulation of the recently found Miniactinomyces chinensis and spirisophaerospora pacijica .

关键词： oceanic manganese nodule stromatolite ultra-microbe biolite.

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Depth zonation of Arenigian acritarchs in south china

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Chinese science Bulletin 1997年第3期42卷 248-251页

作者： XU Wanhongdepartment of earth sciences, nanjing university,{3. department of earth sciences Nanjing University Nanjing China

sTAPLIN revealed that palaeoenvironment changes seem to control acritarch distribution patterns. However, scientists have been puzzled by the fact that characteristic offshore acritarchs occur with nearshore ones. This note demonstrates depth zonation of Arenigian acritarchs in south china and reveals the variation of water depth in south china during the Arenig Age.

关键词： south china Arenigian acritarch depth zonation.

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(1.2)INVERsEs OF OPERATORs BETWEEN BANACH sPACEs AND LOCAL CONJUGACY THEOREM

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Chinese Annals of Mathematics,series B 1999年第1期20卷 57-62页

作者： MA JIPU(department of Mathematics,nanjing university,nanjing 210093.china) nanjing Univ Dept Math Nanjing 210093 Peoples R China

Let E and F be Banach spaces and f non-linear C1 map from E into F. The main result isTheorem 2.2, in which a connection between local conjugacy problem of f at x0E and a localfine property of f'(x) at x0(see the Definition 1.1 in this paper) are obtained. This theoremincludes as special cases the two known theorems: the finite rank theorem and Berger's Theoremfor non-linear Fredholm operators. Moreover, the thcorem gives rise the further results for somenon-linear semi-Fredholm maps and for all non-linear semi-Wedholm maps when E and F areHilbert spaces. Thus Theorem 2.2 not only just unifies the above known theorems but alsoreally generalizes them.

关键词： Nonlinear semi-Fredholm maps Conjugacy problem Banach space

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Domain structures and copper vacancies in natural low-djurleite (Cu_(1.93.s)

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Chinese science Bulletin 2001年第6期46卷 502-504页

作者： sUN Tao & XUE Jiyuedepartment of earth sciences. nanjing university.{3. department of earth sciences Nanjing University Nanjing China

Based on HRTEM studies, the domain structure and the copper vacancy model of Dongxiang low-djurleite are discussed. The HRTEM images show: ( i ) The domain structures are the intergrowth between djurleit (dj) and digenite (dg) on nm scale. Although there is a transition area which appears as hexagonal-chalcocite-like structure between them, they still follow orientation relationship of (100)dj//(111)dg. (ii) 1.56%-3.12% vacancies of Cu are present in low-djurleite. There are 1-2 Cu vacancies aver-agely in every b0/2 of the unit cell. This ratio is coincident to the composition of djurleite (Cu1.93.1.97s)

关键词： djurleite HRTEM images domain structure copper vacancies Dongxiang in Jiangxi Province.

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Existence of Invariant Tori for Certain Weakly Reversible Mappings

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Acta Mathematica sinica,English series 2002年第4期18卷 701-718页

作者： Bao she WEI department of Mathematics, nanjing university. nanjing {3. P. R. china department of Mathematics Nanjing University Nanjing 210093 P. R. China

In this paper, we consider certain mappings. M, sufficiently close to an integrable one, which is weakly reversible with respect to the mappings G sufficiently close to an involution of type (m.n). where m, n∈Z_+ are arbitrary. Under some weak non-degeneracy condition, we construct a uniform KAM iteration for proving the existence of a Cantor family of m-tori invariant under the reversible mappings M and the reversing mapping G.

关键词： Weakly reversible mappings Weakly undegenerate condition Invariant tori

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EIT waves and coronal magnetic field diagnostics

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science china(Physics,Mechanics & Astronomy) 2009年第11期52卷 1785-1789页

作者： CHEN PengFei department of Astronomy, nanjing university, nanjing 210093. china 1. department of Astronomy Nanjing University Nanjing 210093 China

Magnetic field in the solar lower atmosphere can be measured by the use of the Zeeman and Hanle effects. By contrast, the coronal magnetic field well above the solar surface, which directly controls various eruptive phenomena, can not be precisely measured with the traditional techniques. several attempts are being made to probe the coronal magnetic field, such as force-free extrapolation based on the photospheric magnetograms, gyroresonance radio emissions, and coronal seismology based on MHD waves in the corona. Compared to the waves trapped in the localized coronal loops, EIT waves are the only global-scale wave phenomenon, and thus are the ideal tool for the coronal global seismology. In this paper, we review the observations and modelings of EIT waves, and illustrate how they can be applied to probe the global magnetic field in the corona.

关键词： coronal mass ejections (CMEs) magnetic field diagnostics magnetohydrodynamics (MHD)

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sorption behavior of U(VI), ^(23.)U(VI) and ^(23.)U(VI) onto fracture-filling clays in Beishan granite, Gansu: Application to selecting the site of high-level radwaste repository in china

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science china earth sciences 2005年第10期48卷 1649-1655页

作者： MIN Maozhong1,2, LUO Xingzhang3. WANG Ju4, JIN Yuanxin4 & WANG Rucheng1 1. department of earth sciences, state Key Laboratory of Mineral Deposit Research, nanjing university,{3. 2. Center of Materials Analysis, nanjing university,{3. 3. department of Environmental science and Engineering, nanjing university,{3. 4. Beijing Geology Institute, Nuclear Industry, Beijing 100029, china department of earth sciences State Key Laboratory of Mineral Deposit Research Nanjing University Nanjing China Center of Materials Analysis nanjing university nanjing china department of Environmental science and Engineering nanjing university nanjing {3. Beijing Geology Institute Nuclear Industry Beijing china

The first results of sorption experiments of U(VI), 23.U(VI) and 23.U(VI) onto original (unpurified) fracture-filling clays from No.1 monzonitic granite intrusion, Beishan area, Gansu Province, china are reported. The monzonitic granite intrusion is a potential location for a high-level radwaste (HLW) repository in china. The present experimental results show that the maximum U(VI) sorption reached 92% at near-neutral pH and the distribution coefficient (Kd) was 1226 mL/g. A high sorption capacity of the fracture-filling clays in host rock on radioactive ele-ments is necessary for HLW deep geological disposal repository. No preferential sorption of 23.U onto the clays was found. Finally, the sorption of U(VI) onto the clays was also modeled using a surface complexation model.

关键词： HLW geological disposal repository, granite, uranium, radionuclide, clay, sorption.

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