贵州桐梓松坎剖面中、下三叠统岩石学特征及沉积环境分析   总被引：1，自引：0，他引：1       下载免费PDF全文

胡广成  鲍志东  张震  罗小玉  蔡雨  刘丽 《古地理学报》2009,11(2):195-204

贵州桐梓松坎剖面中、下三叠统发育齐全,化石丰富,出露良好,是研究上扬子地区海相地层的理想剖面之一。根据地层划分与对比,将其分为下三叠统夜郎组、茅草铺组和中三叠统关岭组。该剖面以碳酸盐岩和碎屑岩为主,其中碳酸盐岩占67％,在夜郞组、茅草铺组和关岭组均有分布;碎屑岩占24％,主要分布于夜郎组。研究表明,松坎剖面中、下三叠统是一套多旋回沉积,其中夜郎组包括2个海进海退旋回,属于潮坪、开阔台地和浅滩沉积环境;茅草铺组包括3个海进海退旋回,属于开阔台地和局限台地沉积环境;关岭组总体上为海退沉积,属于局限台地和潮坪沉积环境。在沉积环境分析的基础上,建立了松坎剖面中、下三叠统的沉积模式,即潮坪-局限台地-浅滩-开阔台地沉积模式。  相似文献   

藏北羌塘中部桃形湖早古生代蛇绿岩的岩石学特征   总被引：8，自引：3，他引：5  

吴彦旺  李才  董永胜  解超明  胡培远 《地质通报》2009,28(9):1290-1296

桃形湖早古生代蛇绿岩是龙木错－双湖板块缝合带近期的重要发现。通过对桃形湖蛇绿岩进行详细的野外地质调查和岩石学、年代学、地球化学的研究发现,桃形湖早古生代蛇绿岩各单元出露齐全,由下到上分别为变质橄榄岩、超基性堆晶杂岩、堆晶辉长岩、基性岩墙群和枕状玄武岩,在堆晶岩中有不同规模的斜长花岗岩（层）脉体。桃形湖堆晶辉长岩的时代为中奥陶世,并具有大洋中脊型的地球化学特点。桃形湖早古生代蛇绿岩的发现说明龙木错－双湖板块缝合带中存在完整的蛇绿岩组合,同时也是古特提斯洋早期裂解的重要证据。  相似文献   

藏北羌塘中部果干加年山地区发现榴辉岩   总被引：5，自引：1，他引：4  

董永胜  李才 《地质通报》2009,28(9):1197-1200

果干加年山位于羌塘中部的龙木错-双湖-澜沧江板块缝合带之内,出露有蛇绿岩、晚古生代浅变质岩系等。新近在该区发现了榴辉岩,以透镜体的形式产于石榴子石白云母片岩中,矿物粒度极细,仅为0.05~0.1mm,典型矿物组合为石榴子石+绿辉石+多硅白云母+金红石。初步研究表明,榴辉岩相变质温压条件为470~520℃、2.21~2.51GPa,属于低温型榴辉岩。该榴辉岩的形成过程对探讨龙木错-双湖-澜沧江板块缝合带的构造演化具有重要意义。  相似文献   

辽西八道壕煤盆地含煤地层时代及聚煤规律分析     

蔡厚安  李宝芳 《中国煤炭地质》2009,(2):1-5

八道壕含煤盆地位于辽西的黑山一彰武地区,与阜新一义县盆地相邻,是阜新外围的一个重要含煤盆地。本文从生物地层和沉积学角度说明八道壕矿区的煤层属于早白垩世,可与阜新盆地的沙海组对比,在此基础上对八道壕矿区的地层层序及煤炭资源赋存的规律进行了研究,认为八道壕盆地的煤层可分为上下两个煤层组,下煤组形成于水下扇边缘．上煤组形成于扇三角洲覆水合适的地区。早期冲积扇自盆地西南注入湖盆,煤层发育在盆地北部,自西侧盆缘断裂前向东超覆,向南碎屑岩增多,煤层变薄尖灭。  相似文献   

Impact of phased uplift of Tibetan Plateau on environmental changes since late Middle Pleistocene: Palynological records in the three terraces of Middle Shiquan River     

Rongke Xu  Xiongfei Cai  Yulian Zhang  Liang Shan  Yaoyu Chen  Jianhong Qi  Gang Wang 《Frontiers of Earth Science》2009,3(4):402-410

Three fluvial terraces in Porougong River in the middle reach of Shiquan River were identified, and the palynological records were investigated to decipher the paleoenvironmental changes in the west inland of the Tibetan Plateau. Three phases of uplift in the west inland of the Tibetan Plateau are suggested to be associated with the third, second, and first fluvial terraces (T₃, T₂, and T₁) being formed at ca.126-25.1 ka B.P., 25.1-4.5 ka B.P., and 4.5-1.3 ka B.P., respectively. The differentiated uplift rate infers that the inland Tibetan Plateau shows an earlier uplift than the surroundings. Coincident with the phased uplift, three episodes of the changes in paleovegetation and paleoclimate since late Middle Pleistocene could be identified by the spore-pollen records, including the forests under the warm-wet climate featured by the assemblage of Picea + Pinus-Betula-Ulmus-Chenopodiaceae-Epheara in the third terrace, the forest-grassy vegetation under the semi-arid and semi-wet climate as shown by the Picea + Pinus-Chenopodiaceae-Epheara assemblage in the second terrace, and the grassland under the cold-dry climate indicated by the Chenopodiaceae-Artemisia-Ephedra assemblage in the first terrace. The association of the paleovegetation and paleoclimate changes with the phased uplift of the fluvial terraces has revealed the important impact of the Plateau uplift.  相似文献   

Distribution of phthalate esters in the groundwater of Jianghan plain, Hubei, China     

Dan Zhang  Hui Liu  Ying Liang  Cheng Wang  Hecheng Liang  Hesheng Cai 《Frontiers of Earth Science》2009,3(1):73-79

Samples of groundwater were collected from 17 sites in the Jianghan plain in July 2007. Sixteen phthalate esters (PAEs) were detected in samples collected by using solid-phase extraction (SPE)-gas chromatography (GC). The results show that there were one or several PAEs in all the samples, and the concentrations of total PAEs ranged from 80.12 to 1882.18 ng/L. Four PAEs, i.e. di-isobutyl phthalate (DIBP), di-n-butyl phthalate (DBP), bis (2-ethoxyethyl) phthalate (BEEP) and di (2-ethylhexyl) phthalate DEHP) were the dominant species. Among these, DIBP, DBP and DEHP concentrations were closely related to the water supply from the Yangtze River, Hanjiang River and Honghu Lake. However, the distribution of BEEP was irregular, which may be due to the application of some kind of products containing BEEP in the related areas. PAE distribution was irrelevant to the electrical conductivity and sample depth.  相似文献   

Comparison of linear and nonlinear shallow wave water equations applied to tsunami waves over the China Sea   总被引：4，自引：0，他引：4  

Yingchun Liu  Yaolin Shi  David A. Yuen  Erik O. D. Sevre  Xiaoru Yuan  Hui Lin Xing 《Acta Geotechnica》2009,4(2):129-137

This paper discusses the applications of linear and nonlinear shallow water wave equations in practical tsunami simulations. We verify which hydrodynamic theory would be most appropriate for different ocean depths. The linear and nonlinear shallow water wave equations in describing tsunami wave propagation are compared for the China Sea. There is a critical zone between 400 and 500 m depth for employing linear and nonlinear models. Furthermore, the bottom frictional term exerts a noticeable influence on the propagation of the nonlinear waves in shallow water. We also apply different models based on these characteristics for forecasting potential seismogenic tsunamis along the Chinese coast. Our results indicate that tsunami waves can be modeled with linear theory with enough accuracy in South China Sea, but the nonlinear terms should not be neglected in the eastern China Sea region.  相似文献   

Finite element modelling of non-linear deformation of rate-dependent materials using a R-minimum strategy   总被引：1，自引：0，他引：1  

H. L. Xing  J. Zhang 《Acta Geotechnica》2009,4(2):139-148

A R-minimum strategy, which was proposed and successfully applied to analyse the non-linear rate-independent finite deformation (including the thermal–mechanical coupling and frictional contact) of elasto-plastic materials, is extended and applied here to simulate the deformation of rate-dependent materials. It involves no iterations, thus belongs to the static-explicit algorithm and avoids the convergence problem resulting from nonlinearities. The R-minimum strategy-based adaptive control scheme of the time step size is proposed and applied to the related analysis of the rate-dependent materials with both the time-dependent and the time-independent viscosity. Both the simple benchmark test and the practical application in evaluation of the effect of the Earth materials on its response to the centrifugal force are carried out to demonstrate the stability, efficiency and usefulness of this algorithm.  相似文献   

Geodynamic modeling     

Huilin Xing  Jianhua Wang 《Acta Geotechnica》2009,4(2):149-149

  相似文献   

中国东北地区地震空间分布与主要断裂带、深部构造及应力场关系   总被引：5，自引：1，他引：4  

王兆国  刘财  冯晅  秦树洪 《世界地质》2009,28(4):513-519

中国东北地区在北东东向应力场控制下, 地震有其特殊性。地震空间分布和深度统计结果表明, 东北地区地震主要受岩石圈断裂(开原-赤峰断裂带) 控制, 以44°N为界, 南北具有明显差异。北部地震发生的数量少于南部, 震源深度主要集中在4～6 km和8～12 km两个深度范围内; 而南部主要集中在8～12 km和28～30 km两个深度范围内。发震深度分析显示, 开原-赤峰、郯庐断裂带、大兴安岭断裂带下可能存在地温较低的区域, 使地震可以在深部孕育。地震分布的Vp和Vs剖面资料的研究暗示, 断裂与速度变化带、断裂与断裂的相交区域是地震易发生区域。  相似文献