中国第四纪地质发展史   总被引：4，自引：1，他引：4  

张宗祜 《海洋地质与第四纪地质》1991,11(2):1-6

中国大陆第四纪地质发展史的决定性因素是以青藏高原抬升为主的新构造运动,干冷—温暖频繁交替的古气候变化。中国第四纪时期内发生过一系列重大的地质事件:强烈的新构造活动及青藏高原的抬升;频繁的冷暖交替的气候变化;第三纪末以来古湖泊的萎缩和消亡及大陆外流型水系的形成;活跃的火山活动;巨厚黄土的堆积;第四纪大沙漠的形成和发展。  相似文献   

The Ionian Abyssal Plain (central Mediterranean Sea): Morphology, subbottom structures and geodynamic history – an inventory     

W. Hieke  H. B. Hirschleber  G. A. Dehghani 《Marine Geophysical Researches》2003,24(3-4):279-310

In order to understand the structure and evolution of the Mediterranean Ridge accretionary complex, it is necessary to understand the structure and history of its foreland. The Ionian Abyssal Plain is one of the varying types of foreland. The state of knowledge for that is presented. Its contour and detailed relief are described for the first time. Based on published and hitherto unpublished seismic data, information on the thickness of the Plio-Quaternary and on the Messinian evaporites are presented. Of particular interest are data concerning the pre-Messinian reflectors. They indicate a pattern of tilted blocks and horst-like features created in pre-Messinian time by tensional tectonics. Varying subsidence continued, however, during Messinian time and controlled the thickness of evaporites. At some places (e.g. Victor Hensen Seahill) vertical tectonics seem to be still active. The main tectonic structures of the Ionian Abyssal Plain are not related to the process of the present accretion and subduction at the Africa/Eurasia plate boundary but are pre-existing and should influence the internal structure of the Mediterranean Ridge which is still growing at the expense of the foreland. As a consequence of our structural evidence, we favour the following interpretation: the Ionian Abyssal Plain is not a remainder of the Jurassic Tethyan ocean but originated by extensive attenuation of continental crust.  相似文献   

等深岩识别标志研究   总被引：5，自引：0，他引：5  

李日辉  李维群 《海洋地质与第四纪地质》1997,17(3):63-70

等深岩的识别标志可分为沉积学标志、古生物学标志和古地理标志三大类。沉这标志主要是成份、粒度、分选以及沉积构造等。研究发现，遗迹化石也是一个重要的识别标志。等深岩往往与Ｎｅｒｅｉｔｅｓ遗迹相伴 生，特别与其中的网状遗迹类关系密切。而且，网状遗这的Ｐａｌｅｏｄｉｃｔｙｏｎ遗迹还可用来指示着深流方向。由于各种标志大多具有多解性，因此在识别等深岩时应采用多种标志的综合。  相似文献   

基于数字剖面的河流阶地与新构造运动研究——以内蒙古西拉木伦河河流阶地为例     

周文孝  ;葛梦春  ;于庆文  ;李超岭  ;赵温霞  ;谢德凡 《中国区域地质》2008,(7):995-1001

野外调查发现在内蒙古东部西拉木伦河流域存在12级阶地序列。利用数字剖面野外系统对该河流阶地剖面的记录完成全程数字化采集,并进行数字剖面桌面系统厚度自动计算和剖面图、柱状图自动生成,发现该阶地序列中T7、T8、T9保存完好,而时代最为古老的T12 根据基座玄武岩形成于上新世—早更新世的年龄,其形成时代应为上新世—早更新世。通过计算新构造运动抬升速率,将其形成、演化过程划分为6个阶段。数据表明,自中新世以来,该地区新构造运动存在一定的周期性,在总体上新构造运动的强度逐渐趋于缓和。  相似文献   

基于数字剖面的河流阶地与新构造运动研究 ——以内蒙古西拉木伦河河流阶地为例     

周文孝  葛梦春  于庆文  李超岭  赵温霞  谢德凡 《地质通报》2008,27(7):995-1001

野外调查发现在内蒙古东部西拉木伦河流域存在12级阶地序列。利用数字剖面野外系统对该河流阶地剖面的记录完成全程数字化采集,并进行数字剖面桌面系统厚度自动计算和剖面图、柱状图自动生成,发现该阶地序列中T7、T8、T9保存完好,而时代最为古老的T12 根据基座玄武岩形成于上新世—早更新世的年龄,其形成时代应为上新世—早更新世。通过计算新构造运动抬升速率,将其形成、演化过程划分为6个阶段。数据表明,自中新世以来,该地区新构造运动存在一定的周期性,在总体上新构造运动的强度逐渐趋于缓和。  相似文献   

南黄海新构造运动   总被引：1，自引：0，他引：1  

侯方辉  张志殉  李三忠  张训华 《海洋地质前沿》2005,21(11):8-10

定义了南黄海新构造运动的概念;提出了南黄海新构造运动的研究方法;阐明了南黄海新构造运动的机理,即受滨西太平洋构造域控制,是在老构造基础上的继承和发展;描述了南黄海新构造运动的基本特征;总结了南黄海新构造运动的研究意义。  相似文献   

青藏高原均衡重力异常研究   总被引：1，自引：0，他引：1  

袁果田  张勇军 《大地测量与地球动力学》1997,(1)

根据重力异常图等有关资料，研究了青藏高原均衡重力异常的分布特征与地质构造、地壳新构造运动间的关系，结果表明：（１）高原内各块体的均衡状态并不均一，而且异常幅值大小与地壳的相对隆起或沉降程度相关；（２）高原均衡异常同强地震分布有较密切的联系  相似文献   

Glacial geomorphology in Utsjoki, Finnish Lapland proposes Younger Dryas fault-instability     

Raimo Sutinen  Matti Piekkari  Maarit Middleton   《Global and Planetary Change》2009,69(1-2):16-28

Northern Fennoscandia has experienced high-magnitude postglacial fault (PGF) events, yet the role of seismic tremors in subglacial deformations and meltwater discharge has remained obscure. We studied glacial geomorphology in Utsjoki, Finnish Lapland, an area characterized by the Utsjoki drumlin field fanning out north and northeast to the Younger Dryas End Moraines (YDEMs) in northern Norway. Paleolandslides were common on fells (i.e. mountains shaped by Pleistocene glaciations) and were formed in nunatak position evidencing fault-instability in app. 11,900 calibrated (cal) BP. An anastomosing network of eskers was found throughout Utsjoki, and was probably generated through short-lived sliding bed stages during the discharge of subglacial lake(s). The formation of networks is different from time-transgressive evolution of single-ridged eskers in arborescent (treelike) systems. The most probable triggering mechanism for the meltwater outburst(s) was an earthquake tremor(s) associated with fault-instability during the late and post-Younger Dryas (YD). The alignment of the esker network was inconsistent with parallel-to-iceflow streamlining and the eskers erode or superimpose drumlins. Hence the esker network post-dates the streamlining. In some cases, hummocky (Pulju) moraine was observed to coexist with esker network and peculiar ‘kettle’ and ‘liquefaction’ features. We propose that glacio-seismotectonic events contributed not only to landslides but were also the primary force behind subglacial evolution of esker networks and possibly even hummocky moraine.  相似文献   

鄂西北房县盆地断裂构造与新构造运动特征     

雷东宁  乔岳强  胡庆  余松  蔡永建 《大地测量与地球动力学》2017,37(2):116-121

通过遥感解译、现场地质地貌调查,获得了房县盆地内及控盆边界断裂活动、河流阶地、夷平面等基础资料,并在此基础上讨论了盆地新构造运动特征。综合分析认为,盆地内断裂早第四纪有一定的活动,晚第四纪以来未见明显活动迹象;控盆断裂第四纪以来有过活动,晚第四纪活动稍强,活动性质以正断为主,表现为隆起背景下的伸展构造环境;盆地新构造活动的显著特征表现为南北差异隆升,新生代地层整体往南倾斜。  相似文献   

新构造运动在南黄海盆地的表现及其对油气成藏的影响          下载免费PDF全文

陈春峰 《沉积与特提斯地质》2019,39(3):84-91

在精细地震资料构造解释基础上,认为上新世—第四纪是南黄海盆地新构造运动的主要活动期,对应南黄海盆地第二个阶段的断裂活动期。垂向上,新构造运动具有早晚构造响应差异:早期南北向弱挤压背景下以张性正断层为主,晚期东西向两幕挤压背景下以逆断层和褶皱为主;平面上,新构造运动影响亦具有差异:北部坳陷活动强烈、正断层发育、逆断层少量,而南部坳陷活动较弱。新构造运动与北部坳陷烃源岩的生排烃时期吻合,断裂带是重要输导体系,也是重要的潜在成藏区。  相似文献