检索结果-南通市图书馆

地学前缘 2009年第S1期16卷 173-174页

作者： Ying Song~1,Jianye Ren~2 1.faculty of earth Resources,china university of geosciences,wuhan 43.074,china. 2.Structural Research Center of Oil & Gas Bearing Basin,Ministry of Education,Branch Center in china university of geosciences,wuhan 43.074,china

Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE china provide a unique opportunity both for building the terrestrial type stage of Cretaceous in china and for studying the response of Cretaceous maj... 详细信息

关键词： Songliao Basin T11 boundary tectonic inversion responding surface tectonic revolution

Delineation of Potential Mineral Resources RegionBased on Geo-anomaly Unit

在线全文

学校读者我要写书评

暂无评论

Journal of earth Science 2000年第2期19卷 66-71页

作者： Chen Yongqing faculty of earth Resources, china university of geosciences, wuhan 43.074 The Center for Development and Research, china Geological Survey, Beijing 100083 Liu Hongguang faculty of earth Resources, china university of geosciences, wuhan 4

The geological anomaly unit method (GAUM) is a new way to delineate and evaluate ore finding targets in line with the “geological anomaly ore finding theory”. Comprehensive ore finding information from geological, geochemical and geophysical data is used for quantitative measurement of the “ore forming geological anomaly unit” in this paper. The main procedures are shown as follows: (1) The geo anomalous events associated with gold mineralization are analyzed in Tongshi gold field; (2) The zonation in the concentrated heavy minerals and the stream sediment elements of ore forming geo anomaly are studied in detail; (3) The deep geological structural framework is deduced by means of the synthetic geological interpretation of gravity and magnetic information; (4) The ore controlling geo anomalies and ore anomalies are chosen as the variables of the favorable ore forming indexes that can be used for the quantitative delineation and evaluation of the potential ore forming regions.

关键词： ore forming geo anomaly unit mineral resources areas comprehensive ore forming information favorable ore forming index Tongshi gold field western Shandong Province Eastern china.

FROM BACK-ARC BASIN TO BACK-ARC FORELAND BASIN—THE SEDIMENTARY BASIN AND TECTONIC EVOLUTION OF THE LATE CALEDONIAN—EARLY HERCYNIAN STAGES IN CORRIDOR AND NORTH QILIAN MTS

在线全文

学校读者我要写书评

暂无评论

地学前缘 2000年第S1期7卷 252-253页

作者： Du Yuansheng, Gong Shuyun, Han Xin, Wang Jiasheng, Hou Guangjiu(faculty of earth sciences, china university of geosciences, wuhan 43.074,china)

Qilian orogenic belt is a typical orogenic belt formed by polycyclic collisions between the North china plate and Qaidam microplate. Qilian ocean originated from the rift of the late Proterozoic Rodinia continent(Pangea\|850), evolved through rift basin and became an archipelagic ocean in the Caledonian stage. The Lower Proterozoic strata in Qilian area are mid\|high\|rank metamorphic rocks that constitute the metamorphic basement of the area. The “Huangyuan Movement" (in South Qilian and Central Qilian) and "Alashan Movement" (in North Qilian) in the latest Late Proterozoic formed a regional unconformity. The middle Proterozoic in the area are mudstones and carbonate rocks with stromatolites and ooids. The Qingbaikou System of the upper Proterozoic in the North Qilian and Corridor region is also mudstone and carbonate rock with stromatolites. The Qingbaikou System in Central Qilian is sandstones and mudstones. There are alkaline and tholeiite in the Sinian System in North Qilian and Corridor. The contact between Qingbaikou System and Sinian System is a regional unconformity (Quanji Movement). Qilian ocean began to rift away in Caledonian tectonic stage on the Pre\|Sinian basement.

关键词： sedimentary basin tectonic evolution late Caledon ian early Hercynian North Qilian Mts. Corridor

Weathered Mantle Hosted Gold Deposit atShewushan, Hubei, Central china

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1期12卷 60-67页

作者： Hong Hanlie Wang Qinyan The Center for Material Research and Testing, wuhan university of Technology, wuhan 430070 Bian Qiujuan faculty of earth sciences, china university of geosciences, wuhan 43.074 The Center for Material Research and Testing Wuhan University of Technology faculty of earth sciences China University of Geosciences

A supergene gold deposit is located at Shewushan, south Hubei, Central china. The Au mass fraction of the supergene deposits ranges from 1.0.10-6 to 19.5 10-6, with an average of about 2.2 10-6. Primary gold mineralization is closely associated with the well developed faults and fractures mainly on the crest of the reverse anticline with gold mass fraction exceeding1.0 X 10-6(average 0.6 X 10-6 ), the gold occurs as small Ag-bearing particles in association with illite and kaolinite, and partly incorporated within the lattice of pyrite. Fluid inclusion studies on the gold mineralization yield trapping temperatures and pressures from 110 to 290 and 410 105 to 460 105 pa, respectively. The salinities of mineralization fluids range from 2. 6 % to 8. 4 % w(NaCl, equivalent). Calculated (18O) values and measured (D) data of the hypogene fluids indicate a meteoric origin. These fluids underwent extreme 18 O enrichment by reacting with country carbonate rock. Supergene gold minerali- zation is confined largely to the lower portion at the weathered mantle; the gold occurs as small native gold particles accompanied by clay minerals, kaolinite and illite and Mn and Fe oxides. Geochemical investigation shows that Au, together with As and Sb, decreases progressively from the top of ore body to some 2 kilometers away and define a lateral dispersion halo. It is proposed that the gold is mobilized by surficial leaching and concentrated at the lower portion of the weathering profile, and thio-sulfate may play an active role in gold dissolution and re-precipitation.

关键词： gold deposit weathering inclusion temperature stable isotopes Shewushan.

Geochemistry of Sedimentation and Diagenesis in Qixia Formation (Early Permian) of Badong, Hubei Province, china: Implications for T-R Cycle Interpretation

在线全文

学校读者我要写书评

暂无评论

Journal of earth Science 1999年第2期18卷 56-62页

作者： Yan Jiaxin Zhao Laishi faculty of earth sciences, china university of geosciences, wuhan 43.074 Fang Nianqiao Department of Geology and Mineral Resources, china university of geosciences, Beijing 100083

Combined with sedimentary observation and mineralogical research on a type of drusy celestite of early diagenesis in origin, this geochemical study on the Qixia Formation at the Shuibuya Section, Badong County, Hubei Province of south china evaluates the contribution of sedimentation and diagenesis to the mass fractions of CaO, Al 2O 3, MgO, SiO 2, Fe 2O 3, Na 2O, K 2O, Mn, Sr, P and Ba in the carbonates. The Sr, initially released from the stabilization of carbonate calcium mineral, precipitated with sulfate ion as celestite in early diagenetic environment, where sulfate reduction was the minimum. Then it redistributed in burial diagenetic environment, where celestite was replaced by calcite. The fractions of the MgO and SiO 2 in the carbonates were mainly modified by the early dolomitization and silicification respectively. That of the Na 2O was overprinted by the burial diagenesis. Multivariate statistical analysis on data of sixty bulk rocks indicates that the mass fractions of the Al 2O 3, K 2O, Fe 2O 3, Mn, CaO, P and Ba were affiliated with the sedimentary factor despite the obvious decrease of CaO during early dolomitization and silicification. Among them, the Al 2O 3 and K 2O mainly represent the detrital components. In addition, a dysaerobic sedimentary background was confirmed by trace element measurement and information derived from the formation of the celestite. This genetic discrimination facilitates the interpretation of the transgressive regressive (T R) cycle and specialities featured this unusual carbonate unit.

关键词： sedimentation diagenesis celestite geochemistry T R cycle.

Engineering Strategies on Flood Control in Middle Reach of Yangtze River, china

在线全文

学校读者我要写书评

暂无评论

Journal of earth Science 2000年第3期19卷 99-102页

作者： Li Chang’an Yin Hongfu Zhang Yufen Gu Yansheng faculty of earth sciences, china university of geosciences, wuhan 43.074, china

Flood disaster has been a serious hidden danger since the ancient time. The essential cause for the fact that floods have not been eliminated for hundreds of years is that time honored strategies do not suit the cases of flood prevention. In the view of geological environmental analyses of flood formation and from the synthesis of experiences gained in flood control in the past hundreds of years, sluggish draining of flood, silt sedimentation in channel and building levee blindly constitute the main cause of intractable flood for a long time in the middle reach of the Yangtze River. Draining away silt and water is the only way to stamping out flood disaster. Opening up artificial waterways for flood diversion, draining away the silt of channel into the polders, and storing the flood water are important engineering measures for the flood control and damage reduction.

关键词： the middle reach of Yangtze River flood disaster opening artificial waterways for flood diversion draining away the silt of channel into the embarked lowlands storing flood water.

Research on the dynamics of the South china Sea opening:Evidence from analogue modeling

在线全文

学校读者我要写书评

暂无评论

Science china earth sciences 2006年第10期49卷 1053-1069页

作者： SUN Zhen1,2, ZHOU Di1, ZHONG Zhihong3, XIA Bin2, QIU Xuelin1, ZENG Zuoxun4 & JIANG Jianqun5 1. CAS Key Laboratory of Marginal Sea Geology, South china Sea Institute of Oceanology, Chinese Academy of sciences, Guangzhou 510301, china 2. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of sciences, Guangzhou 510640, china 3. Department of Technology, Shenzhen Branch of CNOOC, Guangzhou 510240, china 4. faculty of earth sciences, china university of geosciences, wuhan 43.074, china 5. Hainan Oil & Gas Exploration Company, Liaohe Oilfield Petrochina, Panjin 124010, china 1. CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2. CAS Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 3. Department of Technology Shenzhen Branch of CNOOC Guangzhou 510240 China 4. faculty of earth sciences China University of Geosciences Wuhan 430074 China 5. Hainan Oil & Gas Exploration Company Liaohe Oilfield PetroChina Panjin 124010 China

Independent of Indochina extrusion, the South china Sea experienced a process from passive continental rifting to marginal sea drifting. According to the fault patterns in the Beibu Gulf basin and the Pearl River Mouth basin, the continental rifting and early spreading stage from 32 to 26 Ma were controlled by extensional stress field, which shifted clockwise from southeastward to south southeastward. From 24 Ma on, the sea spread in NW-SE direction and ceased spreading at around 15.5 Ma. Integrated geological information with the assumption that the South china Sea developed along a pre-Cenozoic weakness zone, we did analogue experiments on the South china Sea evolu- tion. Experiments revealed that the pre-existing weakness zone goes roughly along the uplift zone between the present Zhu-1 and Zhu-2 depression. The pre-existing weakness zone is composed of three segments trending NNE, roughly EW and NEE, respectively. The early opening of the South china Sea is accompanied with roughly 15° clockwise rotation, while the SE sub-sea basin opened with SE extension. Tinjar fault was the western boundary of the Nansha block (Dangerous Ground), while Lupar fault was the eastern boundary of the Indochina, NW-trending rift belt known as Zengmu basin developed between above two faults due to block divergent of Indochina from Nansha. In the experiment, transtensional flower structures along NW-trending faults are seen, and slight inversion occurs along some NE-dipping faults. The existence of rigid massifs changed the orientations of some faults and rift belt, and also led to deformation concentrate around the massifs. The rifting and drifting of the South china Sea might be caused by slab pull from the proto South china Sea subducting toward Borneo and/or mantle flow caused by India-Asia collision.

关键词： South china Sea, rifting and drifting, clockwise rotation, analogue modeling, rigid massifs.

Organic Geochemistry Characteristics in Ores and Host Rocks from Qixiashan Lead-Zinc Deposit, Nanjing, china

在线全文

学校读者我要写书评

暂无评论

Journal of china university of geosciences 2003年第2期14卷 127-136页

作者： Xie Shucheng Wang Hongmei Guo Jianqiu Liang Bin Zhou Xiugao faculty of earth sciences, china university of geosciences, wuhan 43.074 faculty of earth sciences China University of Geosciences Wuhan 430074

Organic matter, associated with ores, host rocks, ore source rocks and present in fluid inclusions in the Qixiashan lead zinc polymetallic deposit hosted in Upper Carboniferous dolomites and limestones in East china, was systematically analyzed using Fourier transform infrared spectroscopy, gas chromatography (GC), GC/mass spectrometry and proton induced X ray emission. The biomarker ratios of n C - 21 / n C + 22 alkanes, C 23 tricyclic/C 30 hopane and the tricyclic terpane parameters including C 21 /C 23 , C 19-20 /C 21-29 and C 19-25 /C 26-29 can effectively discriminate ores from host rocks. Extractable organic matter present in fluid inclusions displays similarities to those enclosed in the ore source rocks in the biomarker ratios, suggesting that a proportion of organic matter was introduced into the deposit from the ore source strata. The presence of copper and zinc in stage Ⅱ pyrobitumen indicates that some metals may have been transported by an organic fluid or removed from an aqueous fluid by organic matter.

关键词： biometallogenesis biomineralization mineral deposit molecular fossil.

Characteristics of the Bottom Boundary(T11) of Late Cretaceous Yaojia Formation in Songliao Basin and Its Dynamic Background

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 141-142页

作者： Ying Song~(1,2),Jianye Ren~3,Huaizhong Yang~2 1.Key Laboratory of Tectonics and Petroleum Resources(china university of geosciences),Ministry of Education,wuhan 43.074,china. 2.faculty of earth Resources,china university of geosciences(wuhan),wuhan 43.074,china 3.Structural Research Center of Oil&Gas Bearing Basin,Ministry of Education,Branch Center in china university of geosciences,wuhan 43.074,china

Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE china provide a unique oppor- tunity both for building the terrestrial type stage of Cretaceous in china and for studying the response of Cretaceous major global geological *** basin had undergone three stages of tectonic evolution during the Late Jurassic and Cretaceous:syn-rifting phase,post-rifting thermal subsidence phase and basin inversion *** shallow strata of Yaojia Formation contain excellent Putaohua and Sartu reservoir rocks,which contribute great to the giant

关键词： Songliao Basin tectonic inversion responding surface tectonic revolution

Retrogressive Microstructures: A Key to Post-Collisional Uplift and Extension Tectonics of Ultrahigh-Pressure Metamorphic Rocks from Dabie Orogenic Belt, china

在线全文

学校读者我要写书评

暂无评论

Journal of earth Science 1999年第3期18卷 200-206页

作者： You Zhendong Suo Shutian Zhong Zengqiu Zhang Zeming Wei Bize(faculty of earth sciences, china university of geosciences, wuhan 43.074) faculty of earth sciences China University of Geosciences Wuhan 430074

A wealth of retrogressive microstructures have been discovered from the UHP metamorphic rocks in Dabie orogenic belt, namely, the ultrahigh-pressure (URP) eclogites, jadeite quartzites and kyanite-zoisite-quartz vein. The most important are pseudomorphic replacements of UHP minerals like coesite, the corona reaction textures iuduced by solid-solid reactions as well as the corona and symplectites induced by reactions involving fluid. According to the textural relationships the sequence of mineral Paragenesis and the metamorphic stages in the UHP eclogites can be delineated; the mineral geobarothermometry of the various stages of retrograde metamorphism is studied and a clockwise, nearly isothermal decompressive metamorphic PT-trajectory for the UHP eclogites can be reconstructed. In terms of the PT-trajectory the two stage post collision uplirt and exhumation processes are reflected. When the UHP metumorphic rocks extruded to the lower-middle crust partial melting happened which bad in turn caused tke crustal extension and the further exhumation or the UHP metomorphic rocks. Based on the field strain analysis combined with geochronological data a scenario or post collision uplift aud exhumation model is presented.

关键词： retrogressive microstructure ultrahigh-pressure metamorphism Dabie orogenic belt