甘肃北山炭山子东橄榄辉长岩年代学、地球化学特征及其地质意义     

余君鹏  王怀涛  王玉玺  孙新春  任文秀  魏海峰  王晓伟 《岩石矿物学杂志》2021,40(2):202-216

北山地区是中亚造山带的重要组成部分,位于北山地区大山头杂岩体西的炭山子东基性岩体是揭示中亚造山带南缘晚古生代构造演化的重要载体.炭山子东橄榄辉长岩LA-ICP-MS锆石U-Pb年龄为366.0±2.8 Ma,代表该岩体的形成年龄.岩石Si02(47.83％～52.25％)、K20(0.12％～0.45％)、Na20(2...  相似文献   

Meso-Cenozo ic basin evolution in northern Korean Peninsula          下载免费PDF全文

PAK Hyon Uk  LYANG To Jun  LIU Yongjiang  HYON Yun Su  KIM Gyong Chol 《世界地质(英文版)》2009,12(2):80-86

In the Korean Peninsula the Meso-Cenozoic basins were mainly formed due to fault block and block movement. The Mesozoic fracture structures correspond basically to modern large rivers in direction. Such faults were usually developed to rift and formed lake-type tectonic basin, such as the Amrokgang-, Taedonggang-, Ryesonggang-, Hochongang-, Jangphari-, Susongchon-, Pujon-, and Nampho basins. The Mesozoic strata are considered to be divided into the Lower Jurassic Taedong System, Upper Jurassic Jasong System, Upper Jurassic－early Lower Cretaceous Taebo System, and the Upper Cretaceous－Paleocene (Chonjaebong, Hongwon, Jaedok Series) . The Cenozoic block movement succeeded the Mesozoic fault block movement. The Kilju-Myonchon Graben and Tumangang Basin, etc, are the basins related to the fault zones developed from the Oligocene to Miocene. In addition, the Tertiary basins were formed in many areas in the Miocene ( e. g. Sinhung, Oro, Hamhung, Yonghung, Anbyon, Cholwon, etc) . The Cenozoic sedimentation occurred mainly from the late Oligocene to Miocene. The Kilju-Myongchon Graben was the fore deep connected to the sea and the basins inclined in the Chugaryong Fault Zone are intramountain basins. Therefore, coal-bearing beds and clastic rocks in the intramountain basins and rare marine strata and terrigenous clastic rocks are main sedimentary sequences in the Cenozoic.  相似文献   

十万大山盆地北缘侏罗纪轮藻的发现及意义     

蒙有言 《南方国土资源》2000,13(3):19-21

在十万大山盆地北缘的中小型盆地红层中首次发现侏罗纪的轮藻类植物化石.共计2个属,7个种,2个未定种.文章根据轮藻组成特征,讨论了这些中小盆地的地质时代,认为属早中侏罗世,为十万大山盆地侏罗纪红层的研究提供了新的线索.  相似文献   

New Zealand’s deepwater frontier     

Christopher I. Uruski 《Marine and Petroleum Geology》2010

The islands of New Zealand cover an area of approximately 250,000 km², but the New Zealand Exclusive Economic Zone (EEZ) extends to around 4 million km² and recent confirmation of New Zealand’s Extended Continental Shelf (ECS) has added a further 1.7 million km² to the country’s marine estate. Within the 5.7 million km² of New Zealand’s marine territory, approximately 1.2 million km² are underlain by sedimentary accumulations which may be thick enough to expel petroleum.  相似文献   

渤海残留盆地分布综合地球物理研究   总被引：13，自引：3，他引：10       下载免费PDF全文

徐亚  郝天珧  戴明刚  赵百民  李军  涂广红  赵玉合 《地球物理学报》2007,50(3):868-881

以活动论构造历史观为指导进行渤海海域残留盆地宏观分布特征研究. 以岩石物性为基础建立地质界面与物性界面的联系,通过重、磁、震等方法组合圈画不同物性界面的分布特征. 浅层沉积盆地结构通过反射地震资料控制,深层地质结构信息利用重磁异常场分离、物性界面反演等方法得到. 在地层分布格架基础上分析前新生代残留盆地宏观分布范围. 并结合渤海海域实例研究介绍了残留盆地宏观分布研究的技术方法和流程,在计算上古生界-中生界及元古界-下古生界残余地层厚度的基础上给出了渤海海域残留盆地的宏观分布范围,并指出在歧口凹陷东南部、石臼坨隆起南部及东北部、渤南凸起南部、辽东湾等地区是较好的前新生代油气潜力区.  相似文献   

The influence of third order terms on basins of convergence in the Hénon–Heiles type system     

《New Astronomy》2022

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Dinantian sedimentation and the basement structure of the Derbyshire Dome     

Peter Gutteridge 《Geological Journal》1987,22(1):25-41

The depositional history of the Dinantian on the Derbyshire Dome can be divided into three phases: (1) pre-Holkerian: onlap of an irregular basement surface by evaporite and carbonate sediments, (2) Holkerian to Asbian: sedimentation on a carbonate shelf formed by the merging of early Dinantian depocentres following burial of the basement topography, and (3) Brigantian: formation of intrashelf basins and the development of a carbonate ramp on part of the pre-existing shelf. A model of the basement structure underlying the Derbyshire Dome is presented to explain the location of the Brigantian intrashelf basins and carbonate ramp. The basement consists of two main tilted fault blocks separated by a smaller tilt block. Movement on faults bounding the tilt blocks caused the development of intrashelf basins. The basin margins were controlled by structures which developed in the cover sediments. The carbonate ramp present during the late Brigantian developed in response to an eastward tilting of the basement.  相似文献   

甘肃北山双峰山花岗闪长岩锆石LA-ICP-MS定年及其构造意义     

孙新春  王怀涛  李通国  魏海峰  徐磊  王晓伟 《岩石矿物学杂志》2021,40(2):171-184

为了确定双峰山花岗闪长岩的形成时代、岩体成因及形成环境,对其开展了锆石U-Pb年代学、岩石地球化学以及Sr-Nd同位素的研究.LA-ICP-MS锆石U-Pb定年结果表明双峰山花岗闪长岩的形成时代为334.8±2.1 Ma(MSWD= 1.2).岩石具较高的Si02(55.42％～65.53％)、A1203(14.84％...  相似文献   

三维椭球形盆地对球面波的散射          下载免费PDF全文

冯亭  刘中宪  黄磊  刘明珍 《地震工程学报》2021,43(1):131-141

针对三维沉积盆地对球面波的散射问题,发展一种快速宽频间接边界元方法(IBEM).利用ANSYS建立求解模型,基于Intel-Fortran编译器编译相应的计算程序,对基岩半空间三维半椭球形盆地对球面波的散射进行了数值分析,着重探讨入射波频率、波源埋深、波源与不规则地形(沉积盆地)距离等参数对地震动特性的影响规律,计算方...  相似文献   

Local and regional constraints on relative sea-level changes in southern Isle of Skye,Scotland, since the Last Glacial Maximum     

Louise Best  Alexander R. Simms  Martin Brader  Jerry Lloyd  Juliet Sefton  Ian Shennan 《第四纪科学杂志》2022,37(1):59-70

New relative sea-level (RSL) data constrain the timing and magnitude of RSL changes in the southern Isle of Skye following the Last Glacial Maximum (LGM). We identify a marine limit at ~23 m OD, indicating RSL ~20 m above present c. 15.1 ka. Isolation basin data, supported by terrestrial and marine limiting dates, record an RSL fall to 11.59 m above present by c. 14.2 ka. This RSL fall occurs across the time of global Meltwater Pulse 1A, supporting recent research on the sources of ice melting. Our new data also help to resolve some of the chronological issues within the existing Isle of Skye RSL record and provide details of the sub-Arctic marine environment associated with the transition into Devensian Lateglacial climate at c. 14.5 k cal a bp , and the timing of changes in response to the Loch Lomond Stadial climate. Glacio-isostatic adjustment (GIA) model predictions of RSL deviate from the RSL constraints and reflect uncertainties in local and global ice models used within the GIA models. An empirical RSL curve provides a target for future research.  相似文献