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Late Permian-Middle Triassic Sea Level Changes of Yangtze Platform

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Journal of earth Science 1996年第1期15卷 101-104页

作者： Yin Hongfu Tong Jinnan (faculty of earth sciences, china university of geosciences,{4.)

This paper first introduces procedures leading to the establishment of Late Permian-Middle Triassic sea level change curve of Yangtze platform. Bathymetric curves extracted from curve of habitat types are first transformed to sea level curves stage by stage. Comparison between curves of Yangtze and the world reveals that because the Late Permian marine sequences are lacking in most parts of the world, the Late Permian to Griesbachian curve of Yangtze may serve as an important reference for further revision of the world curve. The Early-Middle Triassic short-term changes of Yangtze are briefly concordant with those of Haq's world curve, whereas their long-term changes are discordant. The latter, however, is representative of the East Asian regions affected by the Indosinian orogeny. Basically the third cycles of Yangtze and the world are only pertly concordant, and even in concordant cases their concrete boundaries are not coincident. This indicater that sea level changes are not strictly synchronous over the world. It seems that the 1st and 2nd cycles (supercycles and megacycles) may be world-wide, but not the 3rd cycles.

关键词： Permian Triassic sea level change bathmetric curve Yangtze region.

Distributions of fatty acids in a stalagmite related to paleoclimate change at Qingjiang in Hubei,southern china

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Science china earth sciences 2005年第9期48卷 1463-1469页

作者： XIE Shucheng1,HUANG Junhua1,WANG Hongmei2,YI Yi1,HU Chaoyong1, CAI Yanjun3 & CHENG Hai4.1. faculty of earth Science,china university of {4.,wuhan 430074,china 2. School of Environmental Studies,china university of {4.,wuhan 430074,china 3. SKLLQG,Institute of earth Environment,Chinese Academy of sciences,Xi’an 710075,china 4. Department of Geology and Geophysics,university of Minnesota,MN554.5,USA faculty of earth Science China University of Geosciences Wuhan China School of Environmental Studies China University of Geosciences Wuhan China SKLLQG Institute of Earth Environment Chinese Academy of Sciences Xi’an China Department of Geology and Geophysics University of Minnesota USA

Fatty acids extracted from a subtropical stalagmite at Qingjiang in Southern china’s Hubei Province were analysed using gas chromatography-mass spectrometry. These n-alkanoic acids range from C14.to C26 in carbon number, maximizing at C16, with a second dominance at C22. In contrast to the stalagmite analysed, the overlying soils are characterized by the dominance of heavy-molecular-weight homologues (>C20). The n-fatty acids in the stalagmite were proposed to be contributed by both the soil ecosystems and the microbes harboring in the percolating water and the cave. The ratios of unsaturated to saturated n-fatty acids (C16:1i/C16:0, C18:1/C18:0) appear to show trends comparable with the oxygen isotope records of the stalagmite carbonate, with enhanced values associated with the cold episode such as Heinrich event 1. This paleoclimate-dependent record of the n-fatty acids might reflect microbial changes in physiology and activity in response to the temperature. This record shows somewhat difference from the previous paleoclimate signal extracted from n-alkanols and n-alkan-2-ones of the same stalagmite. The acid record fails to document the well-known Younger Dryas event which was effectively shown by the latter two biomarkers derived from soil ecosystems. This discrepancy might result from the changing biogeochemical impact on different lipid fractions as well as the varied organism populations in different ecosystems.

关键词： biomarker, ecosystem, microbe, speleothem, paleoclimate, Quaternary.

Huanggang Intrusive Complexin Northern Tongbai Area:Island-Arc Tectonic Environment and Its Geological Significance

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Journal of earth Science 1998年第3期17卷 37-41页

作者： Zhang Li Zhang Hongfei faculty of earth sciences, china university of geosciences,{4.

The Huanggang intrusive complex in northern Tongbai area was formed in Early Paleozoic. It mainly consists of ultra basic, basic, intermediate and acid rocks, dominated by intermediate and basic rocks. The complex belongs to calc alkaline series. Geochemical characteristics of major and trace elements show that the complex was derived from the fractional crystallization of co source magma. It is suggested that the complex was formed in island arc tectonic environment and was closely related to the northward subduction of the Erlangping back arc basin. Thus, the subduction of the back arc basin can induce the island arc type magmatism similar to the one formed in the setting of ocean plate subduction.

关键词： Huanggang intrusive complex island arc tectonic environment geochemistry northern Tongbai area North Qinling.

A High Precision Forecasting Model and Its Constructing Method for Vein Type Gold Deposits

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Journal of china university of geosciences 2001年第2期12卷 100-107页

作者： Zhang Jun faculty of earth Resources, china university of geosciences, wuhan 430074 faculty of earth Resources China University of Geosciences

A high precision forecasting and prospecting model incorporating the “field theory field structure analysis field simulation”, a temporal and spatial structural framework reflecting local extremely fine structures, is established to make an effective extraction and an integrated analysis of multivariate forecasting information. This model can best show not only the coupling between metallogenic anomalous structure, mineralized structure and information structure, but also the extraction, optimization, matching and summarization of key forecasting information. The technological keys to this model are the fine structural analysis of geological and geophysical and geochemical anomalous fields and metallogenic fields, and the establishment of occurrence patterns for the spatial location of orebodies.

关键词： high precision forecasting model anomalous structure mineralized structure orebody location.

Stratigraphic Succession,Source-Rock Distribution and Paleoclimatic Zone in Meso-Cenozoic Basins,Eastern china

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Journal of earth Science 1997年第1期16卷 11-15页

作者： Lu Zongsheng Huang Qisheng faculty of earth sciences, china university of geosciences,{4. Li Sitianfaculty of earth Resources, china university of geosciences,{4.

?The unequal spacetime distribution of the source rocks resulted from the mutual superimposition of the biota evolution, basin type, and paleoclimatic change. The basin type is the most important in controlling the distribution of source rocks. The effect of the paleoclimate on the source rocks varied with different basins. In the rift basin, the source rocks were accumulated in the humid, semihumid and semiarid climates; however, in the flexural basin, only in the humid and semihumid climates. The biota features may control, to a great extent, the distribution pattern and the sourcerock quality. The abundance of the terrestrial flora and lacustrine phytoplankton was essential for the generation of the Meso-Cenozoic source rocks on a large scale.

关键词： petroleum source rock paleoclimatic zone Meso-Cenozoic basin eastern china.

^(4.)Ar-^(39)Ar and U-Pb ages of metadiorite from the East Kunlun Orogenic Belt: Evidence for Early-Paleozoic magmatic zone and excess argon in amphibole minerals

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Chinese Science Bulletin 2001年第4期46卷 330-333页

作者： CHEN Nengsong, SUN Min, ZHANG Kexin & ZHU Yunhaifaculty of earth sciences, china university of geosciences,{4., china Department of earth sciences, The university of Hong Kong, Hong Kong SAR, china faculty of earth sciences China University of Geosciences Wuhan China Department of earth sciences The University of Hong Kong Hong Kong SAR China

Single-grain zircon U-Pb and amphibole 4.Ar-39Ar dating have been conducted on a deformed and metamorphosed diorite in the East Kunlun Orogenic Belt, which intruded into the middle Proterozoic Kuhai Group exposed in the south of Xiangride region, Dulan County, NW Qinghai Province. The zircon gives a concordant U-Pb age of (4.6.5±9.1) Ma. The amphibole yields Ar plateau age of (4.8.0±1.2) Ma and an isochronal age of (4.8.9±5.6) Ma. Age results of both stepwise released Ar and conventional K-Ar analysis are remarkably higher than that of zircon U-Pb, suggesting that the amphibole contains excess argon and the amphibole plateau age cannot be taken as the timing of metamorphism or deformation. The zircon age is interpreted to be crystallization age of the diorite pluton, which suggests that an Early-Paleozoic magmatic zone indeed existed in the East Kunlun Orogenic Belt stretching along the region south to the Golmud, Normuhong and Xiangride.

关键词： East Kunlun Orogenic Belt metadiorite geochronology excess argon.

Late Caledonian Ductile Thrusting Deformation in the Central East Kunlun Belt, Qinghai, china and Its Significance: Evidence from Geochronology

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Acta Geologica Sinica(English Edition) 2003年第3期77卷 311-319页

作者： WANG Guocan, CHEN Nengsong, ZHU Yunhai and ZHANG Kexin faculty of earth sciences, china university of geosciences, {4., Hubei 430074 E-mail: wgcan@*** Ren Xifei, Liu Ruixun and Xie Guanglian china Univ Geosci Fac Earth Sci Wuhan 430074 Peoples R China

A high-angle ductile thrusting deformation with top-to-the-north movement penetratively developed in the Proterozoic-Early Paleozoic metamorphic rocks along the Central East Kunlun belt. The deformed rocks suffered epidote-amphibolite facies metamorphism. On the basis of our previous study, we present more data in this paper to further support that the ducdle thrust deformation occurred in the later Caledonian and more detailed information about the deformation. A zircon U-Pb concordant age of 4.6±2.2 Ma of a deformed granodiorite in the ductile thrust zone was obtained and can be interpreted as the lower limit of the deformation. A syntectonically crystallized and also strongly deformed hornblende Ar/ Ar dating gives an Ar/Ar plateau age of 4.6.5±3.8 Ma, which represents the deformation age. A strongly orientated muscovite gives an Ar/Ar plateau age of 4.8±1.6Ma, representing the cooling age after the peak temperature, constraining the upper limit of the ductile thrust deformation. This ductile thrust deformation can be interpreted as the result of the closing of the Central East Kunlun archipelago ocean. To the north, Ar/Ar plateau ages of 382.9±0.2 Ma and 386.8±0.8 Ma of muscovite in the deformed Xiaomiao Group represent the uplift cooling ages of deeper rocks after the thrusting movement. The original thrusting foliation has a low angle. A rotation model was put forward to explain the development of the foliation from the original low-angle to present high-angle dipping.

关键词： ductile thrust deformation geochronology Central East Kunlun Belt Qinghai china

Behavior Mechanism on Sulfide Solid-Liquid Interface and Its Application

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Journal of earth Science 1998年第3期17卷 42-43页

作者： Jia Jianye Pan Zhaolu faculty of earth sciences, china university of geosciences,{4.

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Ｓｕｒｆａｃｅｍｉｎｅｒａｌｏｇｙｉｓｏｎｅｏｆｔｈｅｍｏｄｅｒｎｂｒａｎｃｈｅｓｏｆｍｉｎ－ｅｒａｌｏｇｙ．Ｔｈｅｒｅｓｅａｒｃｈｏｆｔｈｅｉｎｔｅｒｆａｃｅｏｆｍｉｎｅｒａｌ－ｌｉｑｕｉｄ，ｎａｍｅｌｙｔｈｅｓｔｕｄｙｏｎｔｈｅｒｅａｃｔｉｏｎｏ...

关键词： surface mineralogy interface between sulfide and solution adsorption physical chemistry of interface treatment of sewage water heavy metal ion genesis of gold ore.

Location of Triassic Tectonic Suture Between Collided Sino-Korean and Yangtze Cratons in Dabie-Sulu Region, china

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Journal of earth Science 1999年第4期18卷 281-286页

作者： Suo Shutian Zhong Zengqiu You Zhendong(faculty of earth sciences, china university of geosciences,{4.) faculty of earth sciences China University of GeosciencesWuhan 430074

The regional extent and spatial distribution of ultrahigh pressure metamorphic(UHPM) and high pressure metamorphic (HPM) rocks, and the geometrical relationships of various petrotectonic units in the Dabie-Sulu region indicate that the Triassic collisional suture line between the Sino-Korean and Yangtze cratons is situated at the northern margin of the Dabie massif, that is,along the Balifan-Mozitan-Xiaotian fault in the Dabie region, and possibly is linked to the Wulian-Yantai fault in the Sulu region to tbe east. The suture line has been strongly modified duriug and subsequent to UHPM aud HPM events.

关键词： UHPM and HPM belts suture line Dabie massif Dabie-Sulu region