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SHRIMP zircon U-Pb geochronology of early Mesozoic felsic igneous rocks from the southern Lancangjiang and its tectonic implications

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Science china Earth sciences 2006年第10期49卷 1032-1042页

作者： PENG Touping1,2. WANG Yuejun1, FAN Weiming1, LIU Dunyi3, SHI Yuruo3 & MIAO Laicheng4 1. Key Laboratory of Isotope Geochronology and geochemistry, Guangzhou institute of geochemistry, Chinese academy of sciences, Guangzhou 510640, china 2. Graduate University of Chinese academy of sciences, Beijing 100039, china 3. SHRIMP isotope Laboratory, Chinese academy of Geological sciences, Beijing 100037, china 4. institute of Geology and Geophysics, Chinese academy of sciences, Beijing 10002., china Key Laboratory of Isotope Geochronology and geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Graduate University of Chinese academy of sciences Beijing China SHRIMP isotope Laboratory Chinese Academy of Geological Sciences Beijing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

The SHRIMP zircon U-Pb geochronology of three typical samples, including two monzo nitic granites from the Lincang batholith and a rhyolite from the Manghuai Formation are presented in the southern Lancangjiang, western Yunnan Province. The analyses of zircons for the biotite monzonitic granites from the northern (02.X-137) and southern (2.JH-10) Lincang batholith show the single and tight clusters on the concordia, and yield the weighted mean 2.6Pb/2.8U ages of 2.9.4 ± 3.0 Ma and 2.0.4 ± 3.6 Ma, respectively, representing the crystallized ages of these granites. The zircons for the rhyolitic sample (02.X-95) from the Manghuai Formation give a weighted mean 2.6Pb/2.8U age of 2.1.0 ± 5.0 Ma. These data suggest that the igneous rocks from the Lincang granitic batholith and Manghuai Formation have a similar crystallized age. In combination with other data, it is inferred that both were generated at a narrow age span (~2.0 Ma) and were originated from the postcollisional tectonic regime. An early Proterozoic 2.6Pb/2.8U apparent age of 1977±44 Ma is additionally obtained from one zircon from the biotite monzonitic granite (southern Lincang batholith), indicative of devel- opment of the early Proterozoic Yangtze basement in the region. These precisely geochronological data provide important constraints on better understanding the Paleozoic tectonic evolution of the Tethys, western Yunnan Province.

关键词： SHRIMP zircon U-Pb dating, Middle Triassic, Lincang granitic batholith, Manghuai Formation rhyolite, southern Lancangjiang.

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The first finding of superhigh concentration of REE-rich bed in carbonate rock weathering crusts and its siginificance

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Chinese Science Bulletin 1999年第S2期44卷 104-106页

作者： JI Hongbing, WANG Shijie, ZHOU Dequan, OUYANG Ziyuan and SUN Chengxing State Key Laboratory of Environmental geochemistry, institute of geochemistry, Chinese academy of sciences, guiyang 550002. china State Key Laboratory of Environmental geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

THE Pingba soil profile developed on the bedrock Triassic dolomitite and morphologically located in uplandin karst terrain in Central Guizhou, china was proven to be in-situ dolomitite weathering pedogeneticproduct. Continuous sampling method was used for taking samples from man-made excavated pit fromthe Pingba profile. REE for samples was measured on ELEMENT ICP-MS in the institute of {2., CAS. The standard reference samples GSR-6 and GSS-1,4,7 were used to monitor the precisionof REE measurement. The measurement error was less than ≤10%. For PB-T1 sample, the coefficientof variation (CV) of three analytical run precision is: La, Ce, Pr, Nd, Ho, Er≤10%; Sm, Eu, Dy,Tm≤15%; Y, Lu, Gd, Tb≤2.%.

关键词： superhigh REE concentration weathering crust carbonate rock.

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Effect of low-temperature mineralization of mantle fluid processes: as exemplified by the polymetallic deposits of Cenozoic alkali-rich porphyry of western Yunnan, china

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Chinese Science Bulletin 1999年第S2期44卷 24-25页

作者： LIU Xianfan~(1,2., GAO Zhenmin~1, LIU Jiajun~1, ZHAN Xinzhi~1, LI Chaoyang~1 and SU Wenchao 1. institute of geochemistry, Chinese {2. of sciences, guiyang 550002. china 2. Chengdu institute of Technology, Chengdu 610059, china institute of geochemistry Chinese Academy of Sciences Guiyang 550002 China Chengdu institute of Technology Chengdu 610059 China

SANJING region (the region of three rivers, i.e. Jinsha-Lanchang-Nujiang rivers) is a very active Cenozoicinterplate deformation area on the east margin of Qinghai-Xizang Plateau, where the alkali-rich porphyrybodies occur extensively and the porphyry-related polymetallic mineral resources are produced. Manystudies on the petrology and geochemistry of the alkali-rich porphyry have been carried out and thegenerally accepted conclusion is that the petrogenesis material source has something to do with the enriched source in the mantle. The integrated interactive factors of the mineralization related to the alkalirich porphyry consist in the favourable combination of the mantle fluid metasomatism, which is derivedfrom the deep processes, and the conducting and controlling roles of the large-scale deep faults. Alongwith the changes in physical and chemical conditions caused by the diffusion of the ore-forming

关键词： low-temperature mineralization mantle fluid processes alkali-rich porphyry deposit Cenozoic Yunnan.

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Vertical　fluxes　of　volatile　mercury　over　soil　surfaces　in　Guizhou　Province,china

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Journal of Environmental sciences 1997年第2期9卷 116-120页

作者： Feng Xinbin, Chen Yecai, Zhu Weiguo State Key Laboratory of Environmental geochemistry, institute of geochemistry, Chinese academy of sciences, guiyang 550002. china

An instrument that can be used to measure the fluxes of volatile mercury over soil surface in field was set up. From August to October in 1993, the fluxes of volatile mercury over soil surfaces at 5 sites of three different areas(high mercury area, mercury polluted area, and reference area) were measured. The results showed that the measured fluxes over soil surface during daytime were higher than those measured at night, and that the flux of volatile mercury over soil surface has relationship with both the total mercury contents of soil and air temperature.

关键词： mercury fluxes flux chamber Guizhou Province Danzhai Mercury Mine.

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Oxygen isotope as a tracer of REE fractionation in water-rock interaction

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Chinese Science Bulletin 1999年第S2期44卷 224-226页

作者： DENG Hailin~1, LI Chaoyang~1, ZHOU Yunman~2.and WANG Chongwu~2.1. Open Laboratory of Ore Deposit geochemistry, institute of geochemistry Chinese academy of sciences, guiyang 550002. china 2. No.1 Geological Party, Yunnan Bureau of Geology and Mineral Resources, Xundian 6552.5, china Open Laboratory of Ore Deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China No. 1 Geological Party Yunnan Bureau of Geology and Mineral Resources Xundian 655205 China

STABLE oxygen isotope is not only an effective approach to tracing water-rock interactions, but also canprovide much information about ore-forming temperature and source and evolution of ore fluids in thestudy of hydrothermal deposits. The rare-earth elements (REE) can be used to trace the sources ofore-forming materials and can also, to some extent, indicate the physical and chemical properties of fluids in the geochemical processes. The combination of these two aspects of research can effectivelyprobe into the geochemical behavior and evolution of REE in the process of water-rock interaction duringhydrothermal ore deposition. On the other hand, the essence of REE as tracers in hydrothermal mineralization can be better understood. In this note the Lemachang independent Ag deposit in northeastern Yunnan is selected for a case study.

关键词： oxygen isotope tracer water-rock interaction REE fractionation.

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GEODYNAMICS OF SUPERLARGE DEPOSITS IN chinses YUNNAN-GUIZHOU-GUANGXI ON THE EASTERN MARGIN OF THE QINGZANG PLEAUTAN

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地学前缘 2000年第S1期7卷 413-415页

作者： Fang Weixuan, Hu Ruizhong, Su Wenchao[WT5,5”BX](LOOG institute of geochemistry, Chinese {2. of sciences, guiyang 550002.china)

Interest in the ore\|forming histories of basins has grown rapid since 1960 and is now intensive. The main reason behind the acceleration is the increasing awareness that the natural processes responsible for generating metal deposits in the sedimentary basin from the source rocks of the beneath the basin and intensively hydrothermal activity in the basin. Observations made in different continental margin basin systems and superlarge deposits in Chinese Yunnan\|Guizhou\|Guangxi Province on the eastern margin of the Qingzang (Himalaya—Karakoram—Tibet) were investigated in terms of geodynamics of basin formation. Geotectonically, the area is situated in the conjoint between the Tethys—Himalaya and the Marginal\|Pacific tectonic domain, characterized by very complex geological structure, typical basin\|mountain tectonics, abundant Superlarge deposits.

关键词： superlarge deposits geodynamics, extensional tectonics sedimentary basin mantle plume extension of lithosphere Chinese Yunnan\|Gui zhou\|Guangxi Province

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Expression pattern of CYC-like genes relating to a dorsalized actinomorphic flower in Tengia(Gesneriaceae)

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Journal of Systematics and Evolution 2010年第5期48卷 309-317页

作者： 1Hong-Bo PANG 2.ing-Wen SUN 2.hun-Zhi HE 1Yin-Zheng WANG 1(State Key Laboratory of Systematic and Evolutionary Botany,institute of Botany,Chinese academy of {2.,Beijing 100093,china) 2.guiyang College of Traditional Chinese Medicine,guiyang 550002.china) (State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (guiyang College of Traditional Chinese Medicine Guiyang 550002 China)

Tengia has been called a "natural peloria" in the family Gesneriaceae because it exhibits an almost perfect actinomorphic flower from whorl one to whorl *** would be especially interesting to know whether or how CYC-like gene activities are related to this type of perfect actinomorphic *** address this,we have isolated four CYC-like TCP genes and carried out an investigation on their expression patterns in ***1C and TsCYC1D have similar expression patterns with strong signals being detected in all five petals and stamens,whereas TsCYC2. and TsCYC2. are only transiently expressed in the very early floral *** results suggest that the expansion of the expressions of TsCYC1C and TsCYC1D from the dorsal to the ventral petals is likely responsible for the evolutionary formation of the fully dorsalized actinomorphic corolla,that is,an expanded functional domain of CYC-like gene dorsal identity in Tengia ***,the expressions of TsCYC1C and TsCYC1D are not correlated with stamen abortion;therefore,TsCYC genes do not functionally repress the stamen development in Tengia *** is probably due to changed cis-activities that result in the cell cycle-related genes uncoupling from the TsCYC regulatory pathway in Tengia.

关键词： actinomorphy CYCLOIDEA dorsalized Gesneriaceae RNA in situ hybridization Tengia.

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Effect of Pb, Hg and Cd in soil on scavenging system of activated oxygen in tobacco leaves

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Chinese Science Bulletin 1999年第S2期44卷 91-93页

作者： YAN Chongling~(1,2., HONG Yetang~1, WANG Shijie~1, LIN Peng~3, YANG Xianke~2. FU Shunzhen~2. ZHU Keyong~2.and WU Shanqi~2.1. State Key Laboratory of Environmental geochemistry, Chinese academy of {2., guiyang 550002. china 2. Guizhou institute of Environmental Protection, guiyang 550002. china 3. Department of Biology, Xiamen University, Xiamen 361005, china State Key Laboratory of Environmental geochemistry Chinese Academy of Sciences Guiyang 550002 China Guizhou institute of Environmental Protection Guiyang 550002 China Department of Biology Xiamen University Xiamen 361005 China

Pb, Hg and Cd will affect human health by vegetative chain. In recent years, people more and more are concerned about heavy metal pollution of the soil-plant system. Many researchers studied the effect of single heavy metal on growth, photosynthesis, respiration and quality of plants, but few systematicstudies of the effect of heavy metals on the scavenging system of activated oxygen of plants. This note systematically studies the effect of Pb, Hg and Cd in soil on the scavenging system of activated oxygen in tobacco leaves. 1 Material and methods Material: Tobacco (Nicoticana tabacum L). Methods: Cultivating and measuring methods were according to reference. 2.Results Results of this study indicate that the common effect of Pb, Hg and Cd on activity of CAT is obvi-

关键词： Pb Hg and Cd scavenging system of activated oxygen tobacco.

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Discovery of sponge body fossils from the late Meishucunian (Cambrian) at Jinsha, Guizhou, south china

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Progress in Natural Science:Materials International 2005年第8期15卷 708-712页

作者： YANG Xinglian 1,2., ZHAO Yuanlong2. WANG Yue2.and WANG Pingli2.1. Nanjing institute of Geology and Palaeontology, Chinese academy of {2., Nanjing 2.0008, china 2. institute of Resource and Environment, Guizhou University, guiyang 550003, china) Nanjing institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China institute of Resource and Environment Guizhou University Guiyang 550003 China

Here we report discovery of a sponge body fossil Triticispongia sp. from the base of lower Cambrian Niutitang Formation at Jinsha, Guizhou. Stratigraphically, the fossil horizon is located below Ni-Mo ore layer with the Niutitang Biota above, and is equivalent to the late Meishucunian. The species is global in shape with skeletons composed of stauractins and monaxons. Triticispongia sp. reported here may be the earliest sponge body fossils of Cambrian, which provides new information for understanding early evolution and radiation of sponge animals.

关键词： sponges Cambrian Niutitang Formation Guizhou china.

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^(40)Ar/^(39)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance

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Science china Earth sciences 2004年第9期47卷 794-803页

作者： ZHANG Yueqiao1, CHEN Wen2. 3 & YANG Nong1 1. institute of Geomechanics, Chinese academy of Geological {2., Beijing 100081, china 2. institute of Geology, Chinese academy of Geological {2., Beijing 100037, china 3. institute of Geology and Geophysics, Chinese academy of {2., Beijing 10002., china institute of Geomechanics Chinese Academy of Geological Sciences Beijing China institute of Geology Chinese Academy of Geological Sciences Beijing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Based on field geological survey, structural measurements and classical Ar/Ar dating of mica, biotite and K-feldspar, we obtain cooling ages for Miocene left-lateral shear along the Xianshuihe fault zone. The results document two thermal events during the sinistral shear. The early event (12.10 Ma) corresponds to rapid cooling of the Zheduoshan granitic massif from above 700℃ to below 350℃. The late event (5-3.5 Ma) corresponds to cooling of granites intruded along the eastern side of the fault zone. These dating results provide important thermochronological constraint on the timing of late Cenozoic eastward extrusion of the Chuan-Dian Block in the SE Tibetan margin.

关键词： Xianshuihe fault zone, Zheduoshan granitic massif, sinistral shear deformation, 40Ar/39Ar dating, late Cenozoic.

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