检索结果-南通市图书馆

Acta Geologica Sinica(English Edition) 2016年第5期90卷 1598-1610页

作者： ITO Tsuyoshi FENG Qinglai MATSUOKA Atsushi State Key Laboratory of Geo-processes and Mineral Resources China University of Geosciences Graduate School of Science and Technology Niigata University research institute of geology and geoinformation Geological Survey of Japan Department of geology Faculty of ScienceNiigata University

The Permian planktonic distribution is not well known,in contrast to other fossil distributions of nekton and *** are representative microfossils of plankton in the Permian *** study compares both correlated radiolarian occurrences（Pseudotormentus De Wever et Caridroit and Quadriremis Nazarov et Ormiston） in literature data from the Pacific Rim and quantitative data from the Liuhuang and Gujingling sections in South *** distributions are concentrated in the Panthalassa,whereas Quadriremis occurrences are distributed over both the Panthalassa and the *** uneven distribution of Pseudotormentus seems to have been controlled by a difference in the oceanic basins,indicating the presence of faunal differences in Permian planktonic microorganisms between the Panthalassa and the *** other words,this study infers the provincialism of Permian planktonic *** uneven distribution is explainable by a hypothesis that Pseudotormentus was strongly affected by a Panthalassan equatorial current.

关键词： palaeobiogeography Palaeotethys Panthalassa Permian radiolaria Pseudotormentus Quadriremis

Gottfried Konecny:The photogrammetric and remote sensing trend setter

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2021年第1期24卷 13-21,I0004页

作者： Karsten Jacobsen institute of Photogrammetry and geoinformation Leibniz University HannoverHannoverGermany

There are various publications on the 90th birthday of Gottfried *** involvement in the International Society for Photogrammetry and Remote Sensing(ISPRS)is particularly described by ***,his forward-oriented impulses in research and development at the former institute for Photogrammetry and Engineering Survey of the(Technical)University of Hannover,today institute for Photogrammetry and geoinformation,Leibniz University Hannover,and some of his activities supporting developing and other countries by given shortterm courses are *** Konecny was always one of the first in pushing new *** the analytical plotter AP/C-3,he introduced analytical photogrammetry in *** on his experience with this not really operational version,he induced the company Zeiss to develop the first really operational analytical plotter Planicomp,which resulted in the end of analog photogrammetric devices and their *** the invitation of Gilbert Hobrough,a mainly hardware-based image correlator was developed for the AP/C-3 in Hannover which anticipated many of today’s *** Konecny initiated remote sensing in *** on his proposal with the Metric Camera Flight on Spacelab,the then highest resolution civil stereoscopic space images available were *** limited computer performance at his institute,a digital stereo plotter was developed,using hardware components from the cooperating Swedish company Context Vision,long before digital stereo workstations with increased and affordable computer capacity were ***,in the area of GIS,he too,pushed development in collaboration with companies and *** before the end of his time as head of the institute,and more so after he became emeritus professor,he started a series of educational workshops,particularly in developing countries,but also other countries,to support the development of photogrammetry,remote sensing and *** prom

关键词： initiated gramme hardware

Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2016年第3期27卷 403-411页

作者： Tsuyoshi Ito Xin Qian Qinglai Feng State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Stratigraphy and Tectonics research Group Institute of Geology and Geoinformation Geological Survey of Japan School of Earth Sciences China University of Geosciences

The Changning-Menglian belt, distributed over southwestern Yunnan Province in Southwest China, contains oceanic rocks that are considered to be remnants of the Paleotethys. This study observed Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt and analyzed their geochemistry. The samples have high concentrations of SiO2（81.65 wt.%–88.38 wt.%; average： 84.99 wt.%±2.14 wt.%）. Most of the samples were plotted in the non-hydrothermal field on the Al-Fe-Mn diagram. Most of the samples were plotted in the continental margin field on the Fe2O3/TiO2-Al2O3/（Al2O3＋Fe2O3） and（La/Ce）N-Al2O3/（Al2O3＋Fe2O3） diagrams. Moreover, the samples show a flat REE（rare earth element） pattern normalized to NASC（North America shale composite）. These geochemical results, in addition to the lack of rhythmical bedding of the siliceous rocks, strongly suggest that the siliceous rocks are unlikely to represent pelagic deposits. Although previous studies have suggested that the siliceous rocks are pelagic deposits, the present results indicate that the extent of the pelagic ocean basins in the Paleotethys during the Triassic is probably less than previously believed. These non-pelagic deposits may represent the closure stage of the Paleotethys.

关键词： geochemistry Triassic siliceous rock Paleotethys Muyinhe Formation Changning-Menglian belt

The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2016年第2期27卷 255-270页

作者： Lei Xiang Chunfang Cai Xunyun He Lei Jiang Yuyang Yuan Tiankai Wang Lianqi Jia Lei Yu Nanjing institute of geology and Palaeontology Chinese Academy of Sciences institute of geology and Geophysics Chinese Academy of Sciences Hangzhou research institute of geology Petro China Exploration and Development research institute of Petro China Changqing Oilfield Company Petro China

Well-exposed Lijiatuo Section was chosen to explore the temporal evolution and controls of the oceanic redox state, primary productivity and seawater sulfate levels during the Cambrian Series 1-2, South China. This section consists of Xiaoyanxi Formation（Fm.） mudstones and Liuchapo Fm. cherts that deposited in the slope and basin environment. Five oxic-anoxic cycles were identified based on V/Sc, Th/U and the enrichment factors of Mo, U, V, Ni and Cu. The Middle-Upper Liuchapo Fm. and the Middle Xiaoyanxi Fm. were deposited under oxic-suboxic conditions, and the rest of the strata were under anoxic conditions. The Re/Mo ratio demonstrated that the oxic-suboxic conditions in the Middle Xiaoyanxi Fm. were accompanied by transient sulfidic conditions, and the rest of the section was underanoxic and non-sulfidic conditions. All the TOC and the enrichment factors of Ba, Ni, Cu, Zn and Cd demonstrated that both the sinking and burial flux of organic matter（OM） in Liuchapo Fm. were lower than that in the overlying Xiaoyanxi Fm. The highest sinking and burial flux of OM in the Xiaoyanxi Fm. appeared at its lower parts; however, the lowest sinking and burial flux of OM in the Xiaoyanxi Fm. appeared in its middle parts. TOC/TS, TS and the vertical trend of δ^（34）S_（py） demonstrated that the seawater was dominated by low oceanic sulfate levels, which resulted in the absence of free H_2S. The rise of the atmospheric oxygen content may be the principal driver for the associated, transient suboxic-oxic and nearly sulfidic environment in the middle Xiaoyanxi Fm.

关键词： trace element redox state seawater sulfate level Cambrian Series 1-2 South China.

Main Controlling Factors and Dominant Reservoir Series Analysis of Es_3 in the Qibei Area of Qikou Sag

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第1期87卷 219-231页

作者： PU Xiugang HAN Wenzhong HUA Shuangjun ZHANG Wei CHEN Changwei research Department of Fundamental geology Exploration and Development Research InstituteDagang Oilfield

Based on analysis of geophysical data such as core observation, rock slices identification, physical property, scanning electron microscope, X-ray diffraction, logging data etc., 16 factors of sedimentation, diagenesis, fluid pressure, and their relationships with reservoir physical property were analyzed, and the results indicate sedimentation is the internal factor controlling the reservoir property, diagenesis is the external and final decisive factor and abnormal fluid pressure is an important factor preserving the deep reservoir property. Quantitative characterization of diagenesis indicates that compaction and dissolution are more important than cementation and they respectively cause porosity change of-23.6% and 7.7% and -6.2%. Through optimizing 11 main controlling factors and constructing reservoir evaluation index （REI） according to the hierarchical cluster and principal component analysis, reservoir classification standard was established and reservoirs were divided into four classes. The studies show that Es~ SQ4 consists mainly of class I and II, while Es~ SQ6 is mainly of class III and II; the favorable zone is the north and south slope of Qibei sub-sag and the Liujianfang fault-nose. The successful application of the quantitative and comprehensive evaluation in the Qibei area verifies the advanced, practicable method of less artificial factor is suitable for the low porosity and permeability reservoir.

关键词： single factor analysis quantitative characterization comprehensive and quantitativereservoir evaluation Shahejie Formation Qibei area Qikou sag

Geochemical characteristics of crude oils from Well Zheng-1 in the Junggar Basin, Xinjiang,China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2007年第2期26卷 163-169页

作者：李志明张长江秦建中张渠范明刘文斌张志荣 Wuxi research institute of Petroleum geology SINOPEC

Well Zheng-1 is located in the combined area of the central uplift and the north Tianshan piedmont depression in the Junggar Basin. Two oil-bearing beds are recognized at 4788–4797 m of the Lower Cretaceous Tugulu Formation (K1tg) and 4808.5–4812.5 m of the Lower Jurassic Sangonghe Formation (J1s). The geochemical characteristics of family composition, carbon isotopic composition, saturated hydrocarbons, sterane and terpane biomarkers and carotane of two crude oils are described in this paper. The results show that the geochemical characteristics of the two crude oils are basically similar to each other, indicating they were all derived mainly from the high mature, brine, algae-rich lake facies sediments. Oil-source correlation revealed that crude oils of the two beds were derived mainly from the source rocks of Permian and mixed by the oil derived from the source rocks of Jurassic and Triassic. This is consistent with the geological background with several sets of source rocks in the area studied.

关键词：新疆准噶尔盆地 Zheng-1井原油地球化学特征

Early dolomitisation of the Lower-Middle Ordovician cyclic carbonates in northern Tarim Basin, NW China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2017年第7期60卷 1283-1298页

作者： GUO Chuan CHEN DaiZhao DONG ShaoFeng QIAN YiXiong LIU CunGe Key Laboratory of Petroleum Resources research Institute of Geology and Geophysics Chinese Academy of Sciences Wuxi research institute Petroleum geology SINOPEC College of Petroleum Engineering Guangdong University of Petrochemical Technology

High-frequency metre-scale cycles are present within the Lower-Middle Ordovician carbonate successions in northern Tarim Basin, NW China. These metre-scale cycles were variably dolomitised from top to bottom. Three types of replacive dolomites were recognised, including dololaminite(very finely to finely crystalline, planar-s to nonplanar-a dolomite;type-1), patterned dolomite(finely crystalline, planar-s dolomite; type-2), and mottled dolomite(finely to medium crystalline,nonplanar-a(s) dolomite; type-3). Petrographic evidence indicate these dolomites were primarily deposited in supratidal to restricted subtidal environments, and formed in near-surface to shallow burial realms. Geochemically, all types of dolomites have similar δ13C and 87Sr/86 Sr ratios comparable to calcite precipitated in equilibrium with the Early-Middle Ordovician seawater. These geochemical attributes indicate that these dolomites were genetically associated and likely formed from connate seawater-derived brines. Of these, type-1 dolomite has δ18O values(.4.97‰ to.4.04‰ VPDB) slightly higher than those of normal seawater dolomite of the Early-Middle Ordovician age. Considering the absence of associated evaporites within type-1 dolomite, its parental fluids were likely represented by slightly evaporated(i.e., mesosaline to penesaline) seawater with salinity below that of gypsum precipitation. More depleted δ18O values(.7.74‰ to.5.20‰ VPDB) of type-2 dolomite and its stratigraphic position below type-1 dolomite indicate the generation of this dolomite from mesosaline to penesaline brines at higher temperatures in near-surface to shallow burial domains. Type-3 dolomite yields the most depleted δ18O values(–9.30‰to –7.28‰ VPDB), pointing to that it was most likely formed from coeval seawater-derived brines at highest temperatures in a shallow burial setting. There is a downward decreasing trend in δ18O values from type-1 through type-2 to type-3 dolomites, and in abundance of dolomites, indicatin

关键词： Early dolomitisation Cyclicity Carbonate Lower-Middle Ordovician Tarim Basin

Geochemistry,geochronology,and zircon Hf isotopic compositions of felsite porphyry in Xiangshan uranium orefield and its geological implication

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2021年第5期40卷 773-786页

作者： Mingming Tian Ziying Li Jiangtao Nie Jun Zhong Jian Wang Jianhui Cao Beijing research institute of Uranium geology Beijing 100029China

Recently,a new kind of volcanic rock,felsite porphyry,has been revealed by drilling in Xiangshan area,Jiangxi Province,*** better understand petrogenesis and magmatic evolution sequence of the Xiangshan volcanic-intrusive complex,we studied systematic petrology,geochemistry,LA-ICP-MS zircon U–Pb dating,and Hf isotope results of the felsite *** show that the felsite porphyry has similar geochemical characteristics to the porphyroclastic rhyolite,which is the predominant lithology of Xiangshan uranium *** porphyry and porphyroclastic rhyolite have high SiO2,Al2O3,and K2O contents,low Na2O,and MgO contents,and slightly negative Eu ***,these rocks are relatively depleted in large ion lithophile elements(K,Ba,and Sr)and are enriched in high field strength elements(Th,Zr,and Hf).LA-ICP-MS zircon U–Pb dating of the felsite porphyry yielded a crystallization age of 132.2±0.9 Ma,which is coeval to that of the porphyroclastic *** ages signified that Xiangshan volcanic-intrusive complex formed in the Early Cretaceous,during which the entire South China was in the back-arc extension tectonic setting related to the subduction of the Pacific Plate under the Euroasian ***-situ zircon Hf isotope data on a felsite porphyry sample show eHf(t)values from-8.82 to-5.11,while the Hf isotope two-stage model age(TDM2-Hf)ranges from 1513 to 1747 *** with petrological,mineralogical,geochemistry,and geochronology results of the felsite porphyry,it is concluded that the felsite porphyry in Xiangshan might be originated from the partial melting of the Mesoproterozoic ancient metamorphic rocks,with possible input of small amounts of mantle materials.

关键词： Petrogeochemistry LA-ICP-MS zircon U-Pb age Hf isotope Felsite porphyry Xiangshan uranium orefield

Impact of Topography and Land-Sea Distribution on East Asian Paleoenvironmental Patterns

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2006年第2期23卷 258-266页

作者：张仲石王会军郭正堂姜大膀 institute of geology and Geophysics Nansen-Zhu International research Center

Much geological research has illustrated the transition of paleoenvironmental patterns during the Cenozoic from a planetary-wind-dominant type to a monsoon-dominant type, indicating the initiation of the East Asian monsoon and inland-type aridity. However, there is a dispute about the causes and mechanisms of the transition, especially about the impact of the Himalayan/Tibetan Plateau uplift and the Paratethys Sea retreat, Thirty numerical sensitivity experiments under different land-sea distributions and Himalayan/Tibetan Plateau topography conditions are performed here to simulate the evolution of climate belts with emphasis on changes in the rain band, and these are compared with the changes in the paleoenvironmental patterns during the Cenozoic recovered by geological records. The consistency between simulations and the geological evidence indicates that both the Tibetan Plateau uplift and the Paratethys Sea retreat play important roles in the formation of the monsoon-dominant environmental pattern. Furthermore, the simulations show the monsoon-dominant environmental pattern comes into being when the Himalayan/Tibetan Plateau reaches 1000-2000 m high and the Paratethys Sea retreats to the Turan Plate.

关键词： Paratethys Sea retreat Himalayan/Tibetan Plateau uplift paleoenvironmental pattern precipitation field Turan Plate

Experimental Studies on Seismic Anisotropy Enhanced by Alignment of Melt:Implication for the Origin of Abnormal Anisotropy in Tibetan Crust

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2011年第1期22卷 32-39页

作者：杨晓松陈建业杨彧张国苓 State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration School of Geophysics and geoinformation Systems China University of Geosciences Earthquake Administration of Hebei Province

It is commonly agreed that seismic anisotropy, most likely caused by lattice preferred orientation （LPO） of major minerals, is a very important indicator of intracrustal deformation. Ultra- sonic velocity measurements on the rocks from higher Himalayan crystallines （HHC） and Honghe （红河） strike-slip fault zone in Southwest China showed an average anisotropic magnitude of about 5%. However, a series of seismic measurements conducted in Tibet indicated marked anisotropy with a magnitude ranging from 8% to 18% within middle to lower crust. What causes the anomalously strong anisotropy within Tibetan crust？ Parts of HHC rocks, to some extent, had undergone granulitic-grade metamorphism, the temperature and pressure of which were in excess of their solidus. Additionally, oriented leucocratic portions, which are accepted to be products crystallized from localized melt bands and aligned melt pocket （AMP）, are present in HHC pervasively. If melt is oriented, it is expected to be an extremely important factor to influence anisotropy behavior. Experiments performed on analogue materials composed of plexiglass matrix and chocolate demonstrated that aligned melt could result in an extra anisotropy whose magnitude might increase two to three times. The contribution of AMP on anisotropy is likely comparable to or larger than that induced by LPO of major minerals, possibly amphiboles and micas, in middle to lower crust. It is implied that aligned melt may be a potential factor to induce anomalously strong anisotropy within Tibetan middle to lower crust.

关键词： partial melting aligned melt pocket anisotropy experimental measurement,Tibetan crust.