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Depositional Model and Tectonic Evolution of Tertiary Transform-Extensional Basins in Northeast china: Case Study on Yitong and Damintun Grabens

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Journal of Earth Science 1997年第1期16卷 62-67页

作者：  Xie Xinong Huang Yanqiu faculty of Earth resources, china university of geosciences, wuhan 43.074Lu Zongshengfaculty of Earth Sciences, china university of geosciences, wuhan 43.074

? The formation and evolution of the Tertiary transformextensional basins in Northeast china are controlled by extensional and strikeslidding combinational processes because the giant strikeslip fault system, TanchengLujiang fault, cut through the basement or margin. Two kinds of structural styles have been identified in Northeast china: Yitong and Damintun styles. The former shows a clear asymmetry, in which sediments came mainly from two lateral sides and thick filling sediments were adjacent to the main strikeslip fault. The latter shows symmetry filling, in which sediments came from the long axial ends in addition to from two lateral sides. The tectonic evolution of Tertiary transformextensional basins in Northeast china underwent three stages: Eocene extensional, Oligocene transformextensional and Neogene transpressional stages.

关键词： transformextensional basin Tertiary Yitong graben Xialiaohe basin.

A New Accumulation Model of Coal Seams in France Extensional Basins

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Journal of Earth Science 2000年第3期19卷 103-107页

作者： Wang Hua Wang Genfa faculty of Earth resources, china university of geosciences, wuhan 43.074, china

This paper, based on the sedimentary features of the coal seams in the typical extensional (faulted) coal basins between two inland mountainous areas of the Central Massif (France) deals with the accumulation mechanism and the corresponding sedimentary tectonic conditions of these thick coalbeds, and proposes a new coal accumulation model for the inland lacustrine basin thick coalbeds. The presence of a great number of gravity flow sediments such as detrital flow, diluted slurry flow or turbidity current sediments in the coal seams, and that of the contemporaneous gravity slump and deformation structure in the coal seam itself both indicate that the lacustrine environment in the accumulation of the thick coalbeds was characterized by the relatively deep flood and violent sedimentation. This model can not only interpret reasonably the accumulation mechanism of the thick coalbeds developed in the fault basins in the Central Massif, France, but also show its features distinctively from those of the accumulation model of the traditional thick coalbeds.

关键词： thick coalbeds accumulation model sedimentary architecture Central Massif France.

Delineation of Potential Mineral resources RegionBased on Geo-anomaly Unit

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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.

Application of Wavelet Analysis toInterference Elimination for Geochemical Hydrocarbon Exploration

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Journal of Earth Science 2000年第1期19卷 91-93页

作者： Zhang Liuping Ruan Tianjian faculty of Earth resources, china university of geosciences, wuhan 43.074

Interference in the data of geochemical hydrocarbon exploration is a large obstacle for anomaly recognition. The multiresolution analysis of wavelet analysis can extract the information at different scales so as to provide a powerful tool for information analysis and processing. Based on the analysis of the geometric nature of hydrocarbon anomalies and background, Mallat wavelet and symmetric border treatment are selected and data pre-processing (logarithm-normalization) is established. This approach provide good results in Shandong and Inner Mongolia, china. It is demonstrated that this approach overcome the disadvantage of backgound variation in the window (interference in window), used in moving average, frame filtering and spatial and scaling modeling methods.

关键词： geochemical exploration petroleum exploration interference elimination wavelet analysis data processing anomaly recognition.

Magnetic Structure of Archean Kongling Group from Yangtze Craton,South china

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Journal of Earth Science 1998年第2期17卷 52-59页

作者： Liu Qingsheng Department of Applied Geophysics, china university of geosciences, wuhan 43.074 Gao Shan faculty of Earth Sciences, china university of geosciences, wuhan 43.074 Xu Qidong faculty of Earth resources, china university of geosciences, W

Densities and various magnetic parameters (susceptibility, saturation magnetization, saturation isothermal remanent magnetization and intrinsic coercivity) were measured for 20 representative rock samples of different lithologies from the Archean Kongling amphibolite to granulite facies terrain of the Yangtze craton. Metasedimentary rocks and tonalitic trondhjemitic granodioritic granitic (TTGG) gneisses show that values of susceptibility κ and saturation isothermal remanent magnetization SIRM are higher than those of amphibolites and gabbros. The felsic gneisses have averages of κ =(1 163±375)×10 -6 SI, SIRM =(18.23±8.38) A/m and R 1=0.083 3± 0.005 7 and the metasedimentary rocks κ =(1 236±823)×10 -6 SI, SIRM =(20.70±10.91) A/m and R I=0.071 4±0.025 2. In contrast, mafic rocks have average κ =(764±316)×10 -6 SI, SIRM = (10.46±3.94)A/m and R 1=0.036±0.009 4, and are dominated by a mixed paramagnetic and ferrimagnetic behavior. Thermal magnetic analyses indicate that magnetite and maghemite of low coercivity are the major carriers of remanent magnetism in the metaclastic sedimentary rocks and TTGG gneisses. The amphibolite and gabbro contain minor amounts of magnetite and pyrrhotite. Magnetism of metaclastic sedimentary rocks and TTGG gneisses is highly heterogeneous; variation coefficients of κ and SIRM are as high as 67 % and 53 % for the former and 32 % and 46 % for the latter. Mineral compositions suggest that biotite may be responsible for the higher magnetism of the metasedimentary rocks. The highest variations in κ, SIRM and R I exhibited by metasedimentary rocks can also be interpreted by their largest absolute variations in biotite mass fraction relative to mafic rocks and felsic gneisses. The average ratio ( Q ) of natural remanent magnetization to induced magnetization of felsic gneisses and metasediments is 0.47 . Ratios ( REM ) of natural remanent to sat

关键词： magnetic structure amphibolite granulite facies Yangtze craton.

Evolution　of　Circum－Pacific　Basins　andVolcanic　Belts　in　East　china　and　Their　Geodynamic　Background

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Journal of Earth Science 1995年第1期14卷 48-58页

作者： Li Sitian(faculty of Earth resources, china university of geosciences, wuhan 43.074)Mo Xuanxue(Department of Geology and Mineral resources, china university of geosciences, Beijing 100083 )Yang Shigong(faculty of Earth resources, china university of Geosc

Based upon the recent research on the Circum- Pacific geology and sedimentary basins a review of the time - space evolution of Mesozoic and Cenozoic basic and their geodynamic background are outlined. The foreland-type basins originated mainly in Late Triassic during the convergence of East Tethys and the continental collision, while the extensional and transform-extensional basins formed mainly in the Eastern china in Late Mesozoic and Cenozoic. They are closely related to the subduction Process of Pacific Plate from eat and the collision from southwest. As a sighficat indicator of deep Process of the Earth, the igneous rocks and magmatism offer very important information for the basin dynamic analysis. The evolution of the basins in East china were controlled by the combination and alternation effects from the surrounding Plates of Eurasia and the deep Process.

关键词： Cirum-Pacific basins magmatism geodynamics.

Criteria for defining and recognizing the various orders of sequences in outcrop sequence stratigraphy

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Science china Earth Sciences 2004年第7期47卷 618-629页

作者： WANG Xunlian faculty of Earth Sciences and Mineral resources, china university of geosciences, Beijing 100083, china State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, chinese Academy of Sciences, Nanjing 210008, china 1. faculty of Earth Sciences and Mineral resources China University of Geosciences 100083 Beijing China 2. State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences 210008 Nanjing China

The regional distribution in different depositional facies belts is here regarded as an important criterion for defining and recognizing the various orders of sequences. The third-order sequence is possibly global in nature, which may be discerned in different depositional facies belts in one continental margin and can be correlated over long distances, sometimes even worldwide. Commonly, correlation of subsequence (fourth-order sequence with time interval of 0.51.5 Ma) is difficult in different facies belts, although some of them may also be worldwide in distribution. A subsequence should be able to discern and correlate within at least one facies belt. The higher-order sequences, including microsequence (fifth-order sequence) and minisequence (sixth-order sequence), are regional or local in distribution. They may reflect the longer and shorter Milankovitch cycles respectively. Sequence and subsequence are usually recognizable in different facies belts, while microsequence and minisequence may be distinguished only in shallow marine deposits, but not in slope and basin facies deposits. A brief discussion is made on the essential conditions for correct identification of sequences, useful methods of study, and problems meriting special attention in outcrop sequence stratigraphy.

关键词： outcrop sequence stratigraphy, facies belt, sequence, subsequence, microsequence, minisequence, meter-scale cyclothem, Milankovitch cycle.

Fluid Dynamic Field in BozhongDepression, Bohai Bay Basin

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Journal of china university of geosciences 2001年第1期12卷 84-89页

作者： Ye Jiaren Chen Bonghan Yang Xianghua faculty of Earth resources, china university of geosciences, wuhan 43.074 faculty of Earth resources China University of Geosciences

The data from regional geology, boreholes, geophysics and tests are integrated to analyze the fluid dynamic field in the Bozhong depression, Bohai Bay basin. The current geothermal gradient is determined to be about 2.95 /100 m by integrating 266 drill-stem test (DST) measurements and comparing with the global average value. The paleogeothermal gradients are calculated from the homogenization temperatures of saline inclusions, which vary both laterally and vertically. The data from sonic logs, well tests and seismic velocities are used to investigate the pressure variations in the study area. The mudstone compaction is classified as three major types: normal compaction and normal pressure, under-compaction and overpressure, and past-compaction and under-overpressure. The current pressure profile is characterized by normal pressure, sight pressure and intense overpressure from top to bottom The faults, unconformity surfaces and interconnecting pores constitute a complex network of vertical and horizontal fluid flows within the depression. The fluid potential energy profiles present a 'double-deck' structure. The depocenters are the area of fluids supply, whereas the slopes and uplifts are the main areas of fluids charge.

关键词： Bozhong depression fluid dynamic field geothermal field pressure field potential energy field.

Tectonic Dynamic Metallization of Silver-GoldHydrothermal Fluids in Proterozoic GneissTerrene Shear Zones, Suichang, Zhejiang, china

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Journal of china university of geosciences 2001年第1期12卷 68-74页

作者： Wang Siyuan Xiao Qibing Zeng Jianguo faculty of Earth resources, china university of geosciences, wuhan 43.074 faculty of Earth resources China University of Geosciences

The Suichang mine is the largest silicified vein-type silver-gold mineralization system in Southeast china, whose ore bodies are controlled by shear zones developing in Lower Proterozoic gneiss terrene with initial migmatization, which is covered by Upper Jurassic and Lower Cretaceous volcanic rock system and cut by acidic igneous veins of Jurassic and Cretaceous. The conclusions are as follows: (1) The ore-forming fluid is defined as superhigh tectonic-metamorphic fluid on the base of : 1 (D)-(18O) values 2 fluid inclusions;3 trace elements of pyrite from ores. (2) The shear zone silicified orebod-ies occurred in proterozoic, Jurassic and Cretaceous, which have been transforms in part by ore-bearing comb quartz vein of volcanism.

关键词： tectonic dynamic metallization silver-gold hydrothermal fluids Proterozoic gneiss terrene shear zone Suichang field Cathaysian plate.