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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.

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.

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 43.074 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

Electron microscopy study of the sakhaite from endogenous borate deposit in Hunan, china

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Science china earth sciences 2004年第3期47卷 232-238页

作者： LIU Xiangwen1,2, YANG Guangming2, ZOU Huamin3, QU Jing1 & ZHAO Wenxia4.1. Graduate School, china university of geosciences, wuhan 43.074, china 2. Test Center, china university of geosciences, wuhan 43.074, china 3. Physics and Technology College, wuhan university, wuhan 4.0072, china 4. Test Center, Zhongshan university, Guangzhou 510275, china Graduate School China University of Geosciences Wuhan 430074 China Test Center China University of Geosciences Wuhan 430074 China Physics and Technology College Wuhan University Wuhan 430072 China Test Center Zhongshan University Guangzhou 510275 China

Sakhaite specimens from an endogenous borate deposit in Hunan Province, china have been studied in detail by means of transmission electron microscopy (TEM). The selected area electron diffraction (SAED) patterns obtained with different crystal zone axes show that the crystal system is cubic, with a = 1.4.3 nm. The convergent beam electron diffraction (CBED) patterns indicate that the point group and space group of sakhaite is m3m and Fd3m, respec-tively. The space group of synthetic sakhaite determined by Chichagov (1974. is F4.32. The possible reasons why the space groups of the natural and the synthetic sakhaites are different are discussed.

关键词： sakhaite, space group, convergent beam electron diffraction (CBED).

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.

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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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.

Three Dimensional Modeling of Effect of India-Eurasia Collision

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Journal of earth Science 1997年第1期16卷 90-94页

作者： Zeng Zuoxun faculty of earth sciences, china university of geosciences,{4. Li Sitian Yang Shigong faculty of earth Resources, china university of geosciences,{4.Liu Lilin Fu Yongtao faculty of earth sciences, china Univers

The progressive extrusion model proposed by Tapponnier for the effect of IndiaEurasia collision is modified by taking threedimensional deformation and preexisting faults into account. Through model analysis, the possibility is discussed in this paper that the collision causes the inversion of TanchengLujiang faults and Red River fault from leftlateral slip to rightlateral slip, triggers the extension of the sedimentary basins producing oil and gas such as Bohaiwan basin and Yinggehai basin in Cenozoic era, and induces clockwise rotation of Southeast Asia.

关键词： IndiaEurasia collision TanchengLujiang fault Red River fault Bohaiwan basin Yinggehai basin model analysis.

Griesbachian Cyclostratigraphy at MajiashanSection, Anhui Province, china

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Journal of china university of geosciences 2001年第1期12卷 22-26页

作者： Peng Yuanqiao Tong Jinnan faculty of earth sciences, china university of geosciences,{4. Gao Yongqun china university of geosciences Press,{4. faculty of earth sciences China University of Geosciences china university of geosciences Press

The Lower Triassic at Majiashan Section, deposited in the deep part of the Lower Yangtze carbonate ramp, is the only outcrop of the deep Lower Triassic preserved in the present Lower Yangtze region. Even so, the alternations of mudrock of mudrock and marl (or limestone) are still very distinct and recognizableable, though usually more or less condensed. The lithological and geochemical cycles at Majiashan Section are discussed in terms of the sedimentary characters and the contents of some elements analyzed at a 2-centimeter-interval with no hiatus of the Lower Triassic. The division resolution of the Griesbachian stratigraphy may increase to the scale of ten thousand years by the mudrock-marl (or limestone) bundles and the geochemical cycles. The analysis of the relationship between the sedimentary cycles/the geochemical cycles and the Milankovitch cycles may suggest the time limit and the sedimentary rates.

关键词： Majiashan Section Griesbachian sedimentary bundles geochemical characters Milankovitch cycles.

Magnetic Petrology of Archean High-Grade Terrains: Window into Deep Crustal Structure and Geodynamic Processes

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Journal of earth Science 1998年第1期17卷 83-87页

作者： Liu Qingsheng Department of Applied Geophysics, china university of geosciences, wuhan 43.074 Gao Shan faculty of earth {4., china university of geosciences, wuhan 43.074

The major results about magnetic petrology of Archearn high grade terrains in the world are reviewed in this article, focusing on the relationship between rock magnetism and deformation, and metamorphism and intensity of magnetization of the lower continental crust. The important problems about the magnetic study of rocks for high grade terrains are advanced.

关键词： lower continental crust granulite facies terrain magnetic petrology.