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Types and Metallogenic Models of Nickel Sulfide Deposits of China

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Acta Geologica Sinica(English Edition) 1988年第2期1卷 193-206页

作者： Tang Zhongli Ren Duanjin bureau of Geology and Mineral Resources of gansu province, Lanzhou, gansu bureau of Geology and Mineral Resources of gansu province Lanzhou Gansu

Most of the sulfide nickel deposits in China occur on the margins of platforms and their outer mobilebelts. The ore-bearing basic-ultrabasic rock bodies were formed in the Proterozoic and Variscan. The types ofmetallogenic rock bodies include ultrahasic-basic complexes related to volcanism in eugeosynclines andultrabasic rock bodies, ultrabasic-basic complexes and basic rock bodies related to deep fractures. On the basisof ore-forming processes and modes, nickel sulfide deposits of China may be divided into two major types:in-situ magmatic liquid unmixing deposits and deep-seated magmatic liquid unmixing injection deposits. Thelatter may by subdivided into four types: single injection deposits, multiple injection deposits, and pulsatory in-jection depositis, and late injection deposits which may inject into either comagmatic rocks or other kinds ofcountry rocks. Two metallogenic models for nickel sulfide deposits are proposed in this paper.

关键词： Types and Metallogenic Models of Nickel Sulfide Deposits of China

COUNTERMEASURES TO SAND DEVIL REDUCTION IN NORTHWEST CHINA　

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Natural Disaster Reduction in China 1995年第4期 168-172页

作者： Xu Qiyun(The Meteorological bureau of gansu province)

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Assessment of time-dependent seismic hazards on segments of active fault, and its problems

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Chinese Science Bulletin 1998年第23期43卷 1937-1950页

作者： WEN Xueze Seismological bureau of Sichuan province, Chengdu 610041, China Seismological bureau of Sichuan province Chengdu China

Assessment of time dependent seismic hazards on segments of active fault is one of the important techniques of long term earthquake forecast for specific locations. It is based on the data from quantitatively seismo geologic investigation in active faults and expresses seismic hazards of a fault segment with both the earthquake occurrence probability, which increases as the elapsed time increases, and the magnitude predicted. Through summing up and analyzing main technical steps in research of the recent decade, some defects in the current theory and model of this technique are pointed out. For instance, the probabilistic models for recurrence interval are based solely on the quasi periodic behavior of earthquake recurrence, ignoring behavior’s diversity that possibly exists. Variability of repeated rupture dimensions in various cycles is considered inadequately in fault segmentation research, etc. It is most important for improving the reliability of the result of seismic hazard assessment to reveal actual earthquake recurrence behavior and its generalities, and to update relevant models for evaluating probabilistic earthquake hazard based on the behavior and generalities.

关键词： active fault rupture segmentation time dependent hazard probabilistic model long term forecast.

The effect of unstable inertia-gravity wave on the occurrence and the development of typhoon and tropical cyclone

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Acta Oceanologica Sinica 1990年第4期9卷 539-546页

作者： Niu Xuexin Meteorological bureau of Zhejiang province, Hangzhou, China Meteorological bureau of Zhejiang province Hongzhou China. China

In this paper,the analysis of the occurrence and the development of typhoon and tropical cyclone is made with the unstable theory of wave. The result indicates that the primary wave is the unstable inertia-gravity wave in the process of the occurrence and the deveJopmant of typhoon and tropical cyclone: The existence of the deep moist layer and the heating by moisture condensation can impel and intensify the unstability of the wave and is favourable for the reduction of the wave energy dispersion, therefore, it is good for the formation and the development of typhoon and tropical cyclone, and also can slow down the wave speed. Besides, the condition that the change of the specific volume of the basic state with pressure is less than that of adiabatic state may also lead to the wave unstability, thus may have certain effect on the occurrence and the development of typhoon and tropical cyclone.

关键词： wave The effect of unstable inertia-gravity wave on the occurrence and the development of typhoon and tropical cyclone

Ecological niche suitability model with an application in Taojiang land use planning

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Journal of Environmental Sciences 1994年第4期6卷 449-456页

作者： Ouyang Zhiyun Weisman Jason Wang Rusong(Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China) Fu Guinan (Taojiang county Land bureau, Hunan province, China)

Ecological suitability analysis is an important step in ecological planning. It applies the basis toestablish a sound development planning. In this paper, by applying multi-dimension niche concept, an eco-logical niche suitability (ENS) model was developed. The ENS model, combined with geographical informa-tion system (GIS) and spatial simulation, was used to analyze regional resources and environmental features ,and identify the suitability of regional resource and environment to regional development. An application ofthe ENS model in Taojiang agricultural land use planning is presented.

关键词： ecological suitability land use planning GIS.

Main Mineralization Mechanism of Magmatic Sulphide Deposits in China

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Acta Geologica Sinica(English Edition) 1997年第1期71卷 49-57页

作者： Tang Zhongli gansu bureau of Geology and Mineral Resource, Lanzhou, gansu Fei Zhenbi gansu bureau of Geology and Mineral Resource Lanzhou Gansu [?]Tang Zhongli Born in Anqing City Anhui Province in 1934 graduated from Beijing College of Geology in 1956. Former Chief Engineer of the gansu bureau of Geology and Minerai Resources Ministry of Geology and Mineral Resources of P.R. China he is now a member of the Academy of Engineering. He is China's famous expert in nickel deposits and has long engaged in the geological surveys and exploration of deposits of copper nickel and other minerals and the study of the petrology of igneous rocks and the geology of mineral deposits.

Before intruding, primary magmas have undergone liquation and partial crystallization atdepth; as a result the magmas are partitioned into barren magma, ore-bearing magma, ore-richmagma and ore magma, which then ascend and are injected into the present locations once ormultiple times, thus forming ore deposits. The above-mentioned mineralizing process is knownas deep-seated magmatic liquation-injection mineralization. The volume of the barren magma isgenerally much larger than those of the ore-bearing magma, ore-rich magma and ore magma. Inthe ascending process, most of the barren magma intrudes into different locations or outpoursonto the ground surface, forming intrusions or lava flows. The rest barren magma, ore-bearingmagma, ore-rich magma and ore magma may either multiple times inject into the same space inwhich rocks and ores are formed or separately inject into different spaces in which rocks and oresare formed. The intrusions containing such deep-seated magmatic liquation-injection depositshave a much smaller volume, greater ore potential and higher ore grade than that of in-situmagmatic liquation deposits. Consequently this mineralizing process results in the formation oflarge deposits in small intrusions.

关键词： deep-seated liquation injection small rock body large mineral deposit

The Neotectonic Movements of the Changle-Zhao'an Fault Belt in Fujian

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Acta Geologica Sinica(English Edition) 1988年第1期1卷 45-57页

作者： Zhang Hunan Seismological bureau of Guangdong province, Guangzhou Seismological bureau of Guangdong province Guangzhou

The Changle-Zhao’ an fault belt is an important belt bordering the southeast coast of China. It wasformed in pre-Mesozoic time and has undergone polyphase activities of different modes ever since. Through astudy of the data concerning the Cenozoic strata, volcanism. seismicity, hydrothermal activity and crustaldeformation, the characteristics of the neotectonic movement of this fault belt were preliminarily ascertained,the amplitudes and rates of recent faulting in some places were calculated, and the intensities of the activities invarious structural basins along the fault zone were compared. Besides, this paper also discusses the main causefor the origin of the Quanzhou-Shantou strong earthquake tectonic zone.

关键词： The Neotectonic Movements of the Changle-Zhao’an Fault Belt in Fujian