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| 1 | Geomorphologic evidence of phased uplift of the northeastern Qinghai-Tibet Plateau since 14 million years ago显示文摘A typical sequence of fluvial terraces and aeolian deposits overlying these terraces were multidisciplinary investigated. New evidences for uplift process of the northeastern Qinghai-Tibetan Plateau in the past 14 million years were obtained. At least 11 river terraces along Huangshui, the first-class tributary of Yellow River, at the Xining-Huzhu region are identified. While the first one (T1) is classified as an accumulation terrace, the others are all basement river terraces, which consist of the Tertiary sandstone and siltstone bedrock, fluvial gravel and pebbles and the overlying aeolian loess-Red Clay deposit. Samples from the aeolian deposits were examined for paleomagnetic stratigraphic reconstruction (1030 samples), luminescence dating (16 samples), magnetic susceptibility and grain-size distribution (more than 4000 samples). The luminescence dating and stratigraphic correlation suggest that terraces of T11, T10,T8, T7, T3, T2, T1 were formed at 14, 11.3, 1.55, 1.2, 0.15, 0.07 and 0.01 million years ago, respectively. Sedimentological analysis and geomorphological observation indicate that formation and evolution of these terraces were mainly driven by tectonic uplift. Therefore, the terrace sequence provides an ideal geological record of the uplift process of the northeastern Qinghai-Tibet during the past 14 million years, and the timings of the terraces formation are regarded as the timings of tectonic uplift. The significant uplifting events took place at 14, 11.3, 1.2 and 0.15 million years ago, respectively. The fluvial incision at the Xining-Huzhu region is less than 100 m during a period of ~12 million years in the Miocene era (between the T11 and T9), while the Huangshui River had incised 432 m during the past 1.2 million years (from T7 to the present floodplain). The river incision process clearly demonstrates that accelerated rising of the northeastern Qinghai-Tibet Plateau during the late Cenozoic, and provides new evidence of previous thoughts. There was a significant readjustment of the fluvial catchment during 1.55-1.2 million years ago: before this time, the paleoriver flowed to southwest. After this time the Huangshui River flows to southeast. A tectonic movement dominates reorganization of this fluvial system. | LU Huayu1, WANG Xiaoyong1, AN Zhisheng1, MIAO Xiaodong1, ZHU Rixiang3, MA Haizhou2, LI Zhen4, TAN Hongbing2 & WANG Xianyan1 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075 China 2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences. Xining 810008, China 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 4. Department of Geography, Qinghai Normal University, Xining 810008, China | 2004 | Science China Earth Sciences2004，47，9： | 51 |
| 2 | Boron isotopic fractionation in laboratory inorganic carbonate precipitation:Evidence for the incorpora-tion of B(OH)_3 into carbonate显示文摘A laboratory inorganic carbonate precipitation experiment at high pH of 8.96 to 9.34 was conducted, and the boron isotopic fractionations of the precipitated carbonate were measured. The data show that boron isotopic fractionation factors (αcarb-3) between carbonate and B(OH)3 in seawater range 0.937 and 0.965, with an average value of 0.953. Our results together with those reported by Sanyal and collabo-rators show that the αcarb-3 values between carbonate and B(OH)3 in solution are not constant but are negatively correlated with the pH of seawater. The measured boron isotopic compositions of carbonate precipitation (δ11Bcarb) do not exactly lie on the best-fit theoretical δ 11B4-pH curves and neither do they exactly parallel any theoretical δ 11B4-pH curves. Therefore, it is reasonable to argue that a changeable proportion of B(OH)3 with pH of seawater should also be incorporated into carbonate except for the dominant incorporation of B(OH)4- in carbonate . Hence, in the reconstruction of the paleo-pH of sea-water from boron isotopes in marine biogenic carbonates, the use of theoretical boron isotopic frac-tionation factor (α4-3) between B(OH)4- and B(OH)3 is not suitable. Instead, an empirical equation should be established. | XIAO YingKai1,2, LI HuaLing1,3, LIU WeiGuo4, WANG XiuFang1 & JIANG ShaoYong5 1 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China 2 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 3 Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China 4 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 5 State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China | 2008 | Science China Earth Sciences2008，51，12： | 8 |
| 3 | An unusual isotopic fractionation of boron in synthetic calcium carbonate precipitated from seawater and saline water显示文摘Inorganic calcium carbonate precipitation from natural seawater and saline water at various pH values was carried out experimentally. The results show the clear positive relationships between boron concentration and δ11B of inorganic calcium carbonate with the pH of natural seawater and saline water. However, the variations of boron isotopic fractionation between inorganic calcite and seawater/saline water with pH are inconsistent with the hypothesis that B(OH)4- is the dominant spe-cies incorporated into the biogenic calcite structure. The isotopic fractionation factors α between synthetic calcium carbonate precipitate and parent solutions increase systematically as pH increases, from 0.9884 at pH 7.60 to 1.0072 at pH 8.60 for seawater and from 0.9826 at pH 7.60 to 1.0178 at pH 8.75 for saline water. An unusual boron isotopic fractionation factor of larger than 1 in synthetic calcium carbonate precipitated from seawater/saline water at higher pH is observed, which implies that a substantial amount of the isotopically heavier B(OH)3 species must be incorporated preferentially into synthetic inorganic carbonate. The results propose that the incorporation of B(OH)3 is attributed to the formation of Mg(OH)2 at higher pH of calcifying microenvironment during the synthetic calcium carbonate precipitation. The preliminary experiment of Mg(OH)2 precipitated from artificial seawater shows that heavier 11B is enriched in Mg(OH)2 precipitation, which suggests that isotopically heavier B(OH)3 species incorporated preferentially into Mg(OH)2 precipitation. This result cannot be applied to explain the boron isotopic fractionation of marine bio-carbonate because of the possibility that the unusual environment in this study appears in formation of marine bio-carbonate is infinitesimal. We, however, must pay more attention to this phenomenon observed in this study, which accidentally appears in especially natural environment. | XIAO Yingkai1,2,LI Shizhen1,WEI Haizhen1,SUN Aide1,ZHOU Weijian2 & LIU Weiguo2 1. Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China 2. State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710075,China | 2006 | Science China Chemistry2006，49，5： | 7 |
| 4 | Simulation of application strategies for local drug delivery to the inner ear显示文摘 | Plontke SK Salt AN | 2006 | ORI J Otorhinolaryngol Relat Spee2006，68，： | 1 |
| 5 | Analysis of gentamicin kinetics in fluids of the inner ear with round window adminis tration显示文摘 | Plontke SK Wood AW Salt AN | 2002 | Otol Neurotol2002，23，： | 1 |
| 6 | Accumulation of potassium in scala vestibuli perilymph of the mammalian cochlea显示文摘 | Salt AN Ohyama K | 1993 | Ann Otol Rhinol Laryngol1993，102，11： | 1 |
| 7 | Contamination of perilymph sampled from the basal cochlear turn with cerebrospinal fluid显示文摘 | Salt AN Kellner C Hale S | 2003 | Hear Res2003，182，： | 1 |
| 8 | Quantification of solute entry into cochlear perilymph through the round window membrane显示文摘 | Salt AN Ma Y | 2001 | Hear Res2001，154，： | 1 |
| 9 | Simulation of methods for drug delivery to the cochlear fluids显示文摘 | Salt AN | 2002 | Adv Otorhinolaryngol2002，59，： | 1 |
| 10 | Contamination of perilymph sampied from the basal cochlear turn with cerebrospinal fluid显示文摘 | Salt AN Kellner C Hale S | 2003 | Hear Res2003，182，： | 1 |
| 11 | Analysis of gentamicin kinetics in fluids of the inner ear with round window administration显示文摘 | Plontke SK Wood AW Salt AN | 2002 | Otol Neurotol2002，23，： | 1 |
| 12 | Simulation of application strategies for local drug delivery to the inner ear显示文摘 | Plontke SK Salt AN | 2006 | ORI J Otorhinolaryngol Relat Spec2006，68，： | 1 |
| 13 | Phytoremediation: a novel strategy for the removal of toxic metals from the environment using plants 显示文摘 | Salt D E Blaylock M Kumar P B AN | 1995 | Biotechnology1995，13，5： | 1 |
| 14 | Simulation of application strategies for local drug delivery to the inner ear显示文摘 | Plontke SK Salt AN | 2006 | ORL J Otorhinolaryngol Relat Spec2006，68，： | 1 |
| 15 | Quantitative interpretation of corticosteroid pharmacokinetics in inner ear fluids using computer simulations显示文摘 | Plontke SK Salt AN | 2003 | Hear Res2003，182，： | 1 |
| 16 | Perilymph sampling from the cochlear apex:a reliable method to obtain higher purity perilymph samples from scala tympani显示文摘 | Salt AN Hale SA Plontke SKR | 2006 | J Neurosci Methods2006，153，： | 1 |
| 17 | Local inner-ear drug delivery and pharmacokinetics显示文摘 | Salt AN Plontke SK | 2005 | Drug Discovery Today2005，10，： | 1 |
| 18 | Undetectable pressure increase duruinginduction of acute endolymphatichydrops by microinjiection显示文摘 | Salt AN DeMott JE | 1997 | Assoc Res Otolaryngol1997，20，： | 1 |
| 19 | Longitudinal endolymph movements induced by peri - lymphatic injections显示文摘 | Salt AN De Mott JE | 1998 | Hear Res1998，123，： | 1 |
| 20 | Morphological changes of the endolymphatic sac induced by microinjection of artifical endolymph into the cochlea显示文摘 | Andersen H De Mott HE Salt AN | 1999 | Hear Res1999，138，： | 1 |
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