赣闽粤地区早、中侏罗世构造地层研究   总被引：8，自引：0，他引：8  

王彬  舒良树  杨振宇 《地层学杂志》2006,30(1):42-49

对中国东南部浙闽赣湘粤地区侏罗纪以来的沉积地层和赣闽粤一带的早侏罗世—中侏罗世的地层特征和沉积规律进行了研究,结果表明:1)晚三叠世—早侏罗世时赣闽粤地区为东南高西北低的古地理格局,沉积环境差异明显;2)中侏罗世时受古太平洋板块在日本一带俯冲作用的影响,中国东南部发生了构造转换,构造格局发生了明显变动,以再一次的挤压隆升和山前快速堆积为特征,并使区域地层和构造格局从原先的近东西方向展布变成北东方向,尤以南岭东段的武夷山西部表现最明显,使早侏罗世的山地范围朝西北方向扩展,但是在南岭地区的闽西—赣南—粤北一带则以陆内裂谷和双峰式火山作用为特征,其成因可能与其深部动力学背景密切相关;3)从中侏罗世开始,在古太平洋板块强烈俯冲作用下,研究区逐步发生了从古亚洲—特提斯构造体制向古太平洋构造体制的转换,早白垩世已经完成这一构造转换,原先的近东西向构造域已经基本被北东向构造域所取代。中侏罗世是构造体制转换的重要时期,转换位置可能在南岭东段。  相似文献   

中国干旱区不同成因碎屑沉积物的吹蚀速率研究     

宋阳  刘连友  李晓燕  WANG Jianhua  TUO Wanquan  LIU Yuzhang 《地理学报(英文版)》2006,16(4):495-501

1 Introduction The sand deserts in China are the product of long-term wind erosion from clastic sediments and remodified by wind in the arid environments (Wu, 1987; Gao et al., 1993). The origin of aeolian sand is an elementary issue in studying morpholog…  相似文献   

A nested pre-operational model for the Egyptian shelf zone: Model configuration and validation/calibration     

《Dynamics of Atmospheres and Oceans》2017

We explored the variability of the Egyptian shelf zone circulation connected to atmospheric forcing by means of a numerical simulation of the general circulation. A high resolution model grid was used at 1/60° horizontal resolution and 25 sigma layers. The simulation was carried out using the most recent version of the Princeton Ocean Model (POM). The initialised model was run the whole year of 2006 using the analysis forcing data for the same year obtained from ECMWF and MFS (Mediterranean Forecasting System, Pinardi et al., 2003). The model skills were evaluated by means of the root mean square error (RMSE) and correlations. The Egyptian Shelf Model (EGYSHM) simulation suggests the presence of an Egyptian Shelf Slope Current (ESSC), which is flowing eastward at different depths in the domain. We found that the maximum velocity of the ESSC [0.25 m/s] is located near the continental slope during the summer time, while in winter the velocity of ESSC is weaker [0.12 m/s] in the same location. The ESSC appears to be directly affected by Mersa-Matruh gyre system. EGYSHM reproduced the main region circulation patterns, especially after adding the Nile River outflow. We found that wind stress is crucial to force the circulation of the Egyptian shelf zone. EGYSHM SST was significantly correlated to satellite SST in all months at a 95% confidence limit, with a maximum of 0.9743 which was obtained in May 2006. The RMSE between EGYSHM and Argo floats salinity data was about 0.09. We compared our results with satellite altimetry to verify the positions and shapes of mesoscale features.  相似文献   

Synoptic features and structures of some equatorial vortices over the South China Sea in the Malaysian region during the winter monsoon,December 1973     

Boon Khean Cheang 《Pure and Applied Geophysics》1977,115(5-6):1303-1333

In December 1973, Peninsular Malaysia and Sarawak experienced a few periods of heavy rain caused by westward moving equatorial vortices from the South China Sea. In this report, the synoptic characteristies associated with the development and intersification of these vortices are shown. Structure of one of the disturbances was examined. Disturbances in the trades associated with lateral shear were found to be important for the genesis of the equatorial vortices. However, the intensification of these disturbances depended on the interaction with the cold monsoon surge.  相似文献   

TIDAL FEATURES IN THE CHINA SEAS AND THEIR ADJACENT SEA AREAS AS DERIVED FROM TOPEX／POSEIDON ALTIMETER DATA   总被引：2，自引：0，他引：2  

胡建宇  HiroshiKAWAMURA  洪华生  FumiakiKOBASHI  谢强 《中国海洋湖沼学报》2001,19(4):293-305

Some important tidal features of 8 major tidal constituents (M2, S2, K1, O1, P1,Sa, N2 and K2 ) in the china Seas and their adjacent sea areas were obtained using six years‘ TOPEX/POSEIDON altimeter data. The results showed that the obtained co-tidal and co-range charts for these major tidal constituents agreed well with those of previous researches using observational data from coastal tidal gauge stations and numerical models.  相似文献   

浙江诸暨地区陈蔡群主要地质特征及其构造演化探讨     

孔祥生  包超民  顾明光 《浙江国土资源》1994,(1)

陈蔡群原岩的主体形成于大洋岛弧环境，由拉斑玄武岩和同源辉长岩，碳酸盐岩和浊流沉积的泥砂质碎屑岩组成；经受了中压角闪岩相区域动力—热流变质作用和多期褶皱变形；岩石地球化学和同位素年代资料表明，中国东南的威尔逊旋回在中元古晚期便已开始，即那时于扬子古陆与华夏地块之间存在一大洋盆地，洋壳上可能存在拉张期残留的花岗质陆壳碎块。中元古晚期开始了洋壳消减作用及其有关的火山—沉积作用，新元古晚期陈蔡大洋岛弧地体与双溪坞陆弧地体拼贴、碰撞，壳体间的聚合作用触发了陈蔡群岩石的变质、变形。  相似文献   

初论造山带地层学——以三江地区特提斯造山带为例   总被引：6，自引：5，他引：1  

吴根耀 《地层学杂志》1998,22(3):161-169

造山带是一复杂的构造拼贴体,其地层学工作需要新的理论和方法：造山带地层学,它强调盆地分析的活动论史观,即威尔逊旋回各阶段的建造在空间上都不能简单对比,和地史期间大规模的水平运动。以区域构造解析为主的综合分析法是力学分析与历史分析相结合的方法的发展,后者已被赋予了许多新内容,故造山带地层学不一定单按岩相古地理重建这一思路进行。地质图则可以与年代地层单位不发生平行关系的岩石地层单位为填图单位。  相似文献   

二连盆地下白垩统沉积相及含油性   总被引：10，自引：1，他引：9       下载免费PDF全文

张文朝 《地质科学》1998,33(2):204-213

根据大量钻井剖面、地震剖面、岩芯观察、野外出露剖面和岩石分析资料,研究了二连盆地近30个凹陷的下白垩统沉积相,并以勘探程度较高的阿南、吉尔嘎朗图等7个凹陷为重点,恢复了早白垩世的岩相古地理环境,总结了下白垩统的沉积特征、主要沉积体系和油气分布规律,并指出今后的油气勘探方向。  相似文献   

构造物理化学基本问题与金矿成矿预测   总被引：12，自引：2，他引：10  

吕古贤 《地球学报》1998,19(2):117-125

本文初步定义构造物理化学为研究地壳物质在构造力作用下发生的物理变化和化学变化相互关系的领域,提出该领域研究的基本问题：构造附加静水压力、构造影响热和构造岩石物理性质、成岩成矿ｐＴ变化及相组成,讨论了该领域的发展和应用前景。本文还以《金矿重点矿化区带隐仅矿床找矿方法和预测》项目（ＪＧ９４７１１０）成果为主,介绍用构造物理化学成矿找矿理论、方法开展金矿成矿预测方面的主要进展。  相似文献   

云南红土型金矿床地质特征及成矿条件研究   总被引：12，自引：0，他引：12  

李志群 《矿产与地质》1998,12(3):160-166

红土型金矿是云南找金工作的主攻类型之一。云南新构造期运动是红土型金矿的主成矿期,地壳的快速抬升,古气候与古地貌的变化,表现出红土型风化壳剖面发育不全,成熟度低,厚度不大,对基岩含金性依存度高等特点。云南红土型金矿成矿作用为红土化作用的初、中期阶段,其金矿类型有岩控型、层控型和构控型三种。  相似文献