检索结果-南通市图书馆

New stylophorans(Echinodermata) from the Upper Cambrian of Guangxi,South china

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2008年第2期51卷 181-186页

作者： HAN NaiRen1 & CHEN GuiYing1,2 1 Department of resources and Environmental Engineering, Guilin university of Technology, Gulin 541004, china 2 faculty of Earth Sciences, china university of Geoscience, wuhan 43.074, china Department of resources and Environmental Engineering Guilin University of Technology Gulin 541004 China faculty of Earth Sciences China University of Geoscience Wuhan 430074 China

This paper describes for the first time the cornute stylophorans (Echinodermata) in china. The new material came from the Guole Formation of the Furongian (Late Cambrian) in the Guole area of Jingxi, Guangxi Province, South china. These new cornute specimens are preserved in situ and found along with well-preserved trilobites and brachiopods. One new species, Phyllocystis jingxiensis sp. nov., is proposed to accommodate these unusual materials. The new species is defined by the small, heart-shaped theca with the frame composed of ten narrow, smooth and thick marginal plates, three adoral plates and distinctive zygal and aulacophore. Both supracentrals and infracentrals are polygonal-outlined. The marginal plate M1' on the inferior face extends posteriorly to form zygal that possesses a broadened proximal end and the proximal portion joining with the conjunction between M4 and M5 on the inferior face. Aulacophore comprises ten segments at its proximal part and is conical at the middle part (named stylocone). Its distal portion is rather long and bears conspicuous ambulacrum grooves. Tectals are horizontally arranged on superior face and obliquely arranged on inferior face. Both cothurnopore and anal pyramid are vaguely seen on the right anterior corner and the extremity of theca's superior face.

关键词： Phyllocystis Stylophora Echinodermata Cambrian Guangxi South china

Lithospheric Stretching,Subsidence and Thermal History Modeling: Application to Yinggehai,Qiongdongnan and Songliao Basins in East china

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1997年第1期16卷 83-89页

作者： Lin ChangsongDepartment of Energy resources, china university of geosciences, Beijing 100083Li Sitianfaculty of Earth resources, china university of geosciences, wuhan 43.074Zhang QiminWest Nanhai Oil Company, Zhanjiang 524000Zhang

he lithosphere stretching, subsidence and basement thermal history of the Songliao, Yinggehai and Qiongdongnan basins in East china have been investigated by using backstripping technique and stretching models. The subsidence curve of the Songliao basin characterizes a rift basin history evolving from synrift rapid subsidence to postrift thermal subsidence. The calculated stretching factor of the basin is about 1.8 to 2.0 and the horizontal extension is about 55-60 km. The reconstructed subsidence curves of the Qiongdongnan and Yinggehai basins show that the basins underwent several rapid subsidence episodes, which has been interpreted as the result of a multiple stretching of the lithosphere. The total mean stretching factors of the Qiongdongnan and Yinggehai basins, calculated by using a multiple instantaneous stretching model, are about 1.7-1.9 and 2.5-3.0 respectively. The stretching factors of these basins, estimated from subsidence, are consistent with those determined from crustal thinning. The reconstructed thermal histories of these basins are in agreement with the geological observation.

关键词： subsidence stretching Mesozoic rift basin East china.

Water in peridotite xenoliths from South china

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2011年第10期54卷 1511-1522页

作者： WANG Rong 1,2,3 & ZHANG BaoMin 3 1 faculty of Land Resource Engineering, Kunming university of Science and Technology, Kunming 650093, china 2 State Key Laboratory for Mineral Deposits Research, Nanjing university, Nanjing 210093, china 3 faculty of Earth Science, china university of geosciences, wuhan 43.074, china 1. faculty of Land Resource Engineering Kunming University of Science and Technology Kunming 650093 China2. State Key Laboratory for Mineral Deposits Research Nanjing University Nanjing 210093 China3. Faculty of Earth Science China University of Geosciences Wuhan 430074 China

The water contents of nominally anhydrous clinopyroxene （cpx）, orthopyroxene （opx） and olivine （ol） in peridotite xenoliths hosted by Cenozoic basalts from Yingfengling, Zhangchouchun, Fujitian and Lindi, South china, were measured by Micro- FTIR. All cpx and opx grains contained a certain amount of water, which was indicated by the presence of hydroxyls in the crystal structure. The water contents （H20, ppm） of cpx and opx from peridotite xenoliths of the study areas were 293-981, 183-752, 73-586 and 51-423 ppm, and 82-471, 74-571, 53-170 and 9-135 ppm, respectively. No prominent OH absorption bands were detected for any ol grains, indicating that the water contents were below the detection limit （approximately 2 ppm）. The entire rock contents recalculated according to mineral volume proportions were 49-163, 48-168, 21-111 and 8-40 ppm, respectively. Combined with previously reported data describing the water contents of peridotite xenoliths worldwide, the results presented here suggest that water distribution in the continental lithospheric mantle is spatially heterogeneous at a global scale. The lithospheric mantle of South china is much richer in water than that of the North china Craton, and is close to that typical of off-craton localities, such as the Basin and Range Province, and Massif Central.

关键词： FTIR water peridotite xenoliths South china

Determination of Characteristics of Main Sliding Lithological Groups with Displacement Table of Pascal-Yanghui Triangle in china

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1998年第2期17卷 73-76页

作者： Yan Tongzhen Li Yun ’an faculty of Environmental Science and Geotechnique, china university of geosciences, wuhan 43.074 Zhong Yufang faculty of Earth Sciences, china university of geosciences, wuhan 43.074

Thousands of landslide data being taken as the nation wide statistics of sampling and the two state variables of landslide being processed with two methods described in the references, the main types of lithological groups of landslides in china have been sieved and *** the other hand, through the displacement table of Pascal Yanghui triangle used in the information encoding theory, the mark weight of sampling can be calculated and the main lithological groups which have close relationship with landslide occurrence can be *** comparison with the both results, the characteristics of main sliding lithological groups are determinated, and the main distribution regions of landslides can be prognosticated.

关键词： landslide Pascal Yanghui triangle main sliding lithological groups china.

Effect Blasting Excavation of Yujiapeng Tunnel on Stability of Nearby Giant Dangerous Rock Masses (DRM)

在线全文

学校读者我要写书评

暂无评论

Journal of china university of geosciences 2001年第2期12卷 142-144页

作者： Yu Hongming Hu Yanxin Engineering faculty, china university of geosciences, wuhan 43.074 Engineering faculty China University of Geosciences

On the basis of the interpretation of engineering geology of the tunnel and of its adjacent dangerous rock masses (DRM), this paper presents the energy and vibration parameters of the explosion that propagates in different blasting modes according to the experimental formulas now usually employed. Then the stability checking computation of T 8-T 12 area, the most dangerous area of DRM, is conducted under the limited blasting condition and with the limited equilibrium method. The result shows that the effect on the stability is only 5.5 % and that this area also contains certain safety reserves.

关键词： blast energy propagation vibration parameters safety reserves.

Dynamical Process and Genesis of Late Triassic Sediment Filling in Ordos Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1997年第1期16卷 45-48页

作者： Jiao Yangquan Lu Zongsheng Zhuang Xinguo Yang Shigongfaculty of Earth resources, china university of geosciences, wuhan 43.074

Coupling relationship exists in development time of the Qinling orogen and the neighboring Ordos basin, implying that they are connected genetically, that is, the formation and evolution of the Ordos basin are response to orogeny. The present Ordos basin is a residual part of the Late Triassic large Ordos basin. The primary large Ordos basin was featured by four types of boundaries, i.e. (1) southern thrusting boundary; (2) southwestern strikeslip thrusting boundary; (3) northwestern rifting boundary; and (4) northeastern and northern passive gentle slope type boundary. This basin was composed of sequences A and B. These sequences consist of three parts, i.e. lower alluvial systems tract, middle expanding lacustrine systems tract and the upper contracting lacustrine systems tract. A systems tract is actually a parasequence set. Based on division of sequences stratigraphic units and reconstruction of depositional systems tracts, the present paper proposes that: (1) two episodes occurred during Late Triassic Qinling collision orogeny; (2) collision is stronger in western Qinling than in eastern Qinling.

关键词： tectonic sequence dynamics Ordos basin Qinling orogen.

Study on Basin-Filling and Reservoir Sedimentology of Zhu Ⅲ Depression of Pearl River Mouth Basin,South china Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2000年第1期19卷 39-48页

作者： Nie Fengjun Department of Energy resources, china university of geosciences, Beijing 10008 Li Sitian Xie Xinong Wang Hua faculty of Earth resources, china university of geosciences, wuhan 43.074 Zhu Weilin china National Offshore Oil Corporat

Through basin-filling analysis, one coarsening-upward and two fining-upward sequences have been identified in Zhu Ⅲ depression. In accondance with the general model proposed by Ravnas and Steel (1998), the basin-filling has two large cycles—rift (sediment-balanced and -overfilled) and postrift (sedimentunderfilled and starved). During the rifting process, the rifted lake developed through three stages: early, climax and late. The sedimentary characteristics of reservoir rocks show that barrier bar, lagoon and tidal channel facies well developed in Zhuhai Formation; offshore, tidal and barrier bar well developed in Zhujiang Formation. Neighborly, Shenhu, Wenchang and Enping formations deposited in rifted lakes during Paleogene time; Zhujiang Formation deposited in bay, lagoon and shoreface in late Paleogene. Zhujiang and other formations deposited in offshore and open shallow sea to shelf.

关键词： Zhu Ⅲ depression basin-fill reservoir rock facies environment.

Garnet-bearing Granulite Facies Rock Xenoliths from Late Mesozoic Volcaniclastic Breccia, Xinyang, Henan Province

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2001年第4期75卷 445-451页

作者： ZHENG Jianping, SUN Min, LU Fengxiang, WANG Chunyangand ZHONG Zengqiu faculty of Earth Sciences, china university of geosciences, wuhan 43.074, china Department of Earth Sciences, The university of Hong Kong, china faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Department of Earth Sciences The University of Hong Kong China [?]3Zheng Jianping Born in 1964 graduated from the china university of geosciences (wuhan) with a PhD degree in 1997 mainly engaged in teaching and scientific researches on petrology and chemical geodynamics. E-mail: jpzheng@***.

This paper presents the primary results of petrologic, mineralogical and petrochemical studies of garnet-bearing granulite facies rock xenoliths from Xinyang, Henan Province. These xenoliths, which are found in a pipe of late Mesozoic volcaniclastic breccia, are of high density (3.13–3.30 g/cm3) and high seismic velocity (Vp = 7.04–7.31 km/s), being products of underplating of basaltic magmas and had experienced granulite facies metamorphism. The underplating and metamorphism took place before the eruption of the host rock. Petrographical studies and equilibrium T-P calculations show that these xenoliths were captured at a 49 km depth and experienced at least a 16 km uplift before they were captured. The dynamics of the uplift could be related to the continent-continent collision between the North china plate and the Yangtze plate during the Triassic.

关键词： granulite facies mafic rock xenolith uplift Xinyang

A　New　Kind　of　Structural　Model：Constrained　Lateral　Extrusion　in　Western　Ordos　Basin　and　Its　Adjacent　Regions

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1996年第2期15卷 189-192页

作者： Liu Shaofeng(Department of Geology, Northwest university, Xi’an 710069)Li Sitian Yang Shigong(faculty of Earth resources, china university Of geosciences, wuhan 43.074)

A new kind of structural model, the constrained lateral extrusion, is presented based on the study of the Jurassic deformation style, combinatory pattern of several structural belts and the prototype basin development in western Ordos basin and its adjacent regions. The constitution,material movement and geodynamical process of the structural model are proposed. The formation mechanism and genetic relation between structural belts and prototype basins are fully studied.

关键词： western Ordos basin constrained lateral extrusion geodynamical process