塔里木巴楚隆起北缘吐木休克楔形基底卷入构造     

杨庚  赵孟军  陈竹新  雷永良  王晓波 《大地构造与成矿学》2017,41(4):638-652

石油地震资料揭示出塔里木盆地中央巴楚隆起为结晶基底和古生代地层相对隆升区,多数地区缺失中新生界,顶部为第四系陆相碎屑岩不整合覆盖隐伏隆起。在隆起南北两侧构造变形比较强烈,均发育基底卷入的逆冲构造和古生界内逆冲构造。运用断层相关褶皱理论,通过对研究区的二维地震测网解释及钻井标定,综合研究得出巴楚隆起北侧吐木休克卷入基底逆冲断层倾向南,向北逆冲,前寒武系基底到早古生代地层被错断。新生代时期的生长地层特征指示基底卷入构造于古近纪、中新世-上新世和更新世均有活动。构造分析表明基底卷入构造于中生代末期还有一次活动,说明吐木休克构造由多期构造运动形成。向北逆冲的吐木休克基底断层和盖层褶皱构造的向南反冲逆冲断层或滑脱断层共同组成基底卷入楔形构造,楔形点同时位于基底和盖层中。盖层构造以中寒武统膏岩为滑动面,向南逆冲,发育断层扩展或滑脱背斜构造。基底断层和盖层滑脱断层在剖面上组成典型的楔形构造几何形态,平面上形成三角形构造。地震剖面综合解释成果图显示,吐木休克弧形逆冲构造东部盖层反冲构造,即基底卷入楔形构造表现较为清楚,向西则表现不太明显,但地震反射波组(地层转折)指示盖层中仍存在这些反冲构造。纵向地震剖面和联络地震剖面均显示出存在该类构造。吐木休克基底卷入断层弧形构造顶部位移最大,盖层变形相对最小;向东西两侧基底断层位移逐渐减小,盖层构造位移相应逐渐增加。研究认为,塔里木巴楚隆起系挤压作用下,刚性地壳发生挠曲而形成的变形区带。  相似文献   

Low-magnitude earthquakes in Rome: structural interpretation and implications for the local stress field     

Fabrizio Marra 《Geophysical Journal International》1999,138(1):231-243

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Quaternary normal faulting in southeastern Sicily (Italy):a seismic source for the 1693 large earthquake   总被引：5，自引：0，他引：5  

Marcello Bianca  Carmelo Monaco  Luigi Tortorici  Licio Cernobori 《Geophysical Journal International》1999,139(2):370-394

We present geological and morphological data, combined with an analysis of seismic reflection lines across the Ionian offshore zone and information on historical earthquakes, in order to yield new constraints on active faulting in southeastern Sicily. This region, one of the most seismically active of the Mediterranean, is affected by WNW–ESE regional extension producing normal faulting of the southern edge of the Siculo–Calabrian rift zone. Our data describe two systems of Quaternary normal faults, characterized by different ages and related to distinct tectonic processes. The older NW–SE-trending normal fault segments developed up to ≈400  kyr ago and, striking perpendicular to the main front of the Maghrebian thrust belt, bound the small basins occurring along the eastern coast of the Hyblean Plateau. The younger fault system is represented by prominent NNW–SSE-trending normal fault segments and extends along the Ionian offshore zone following the NE–SW-trending Avola and Rosolini–Ispica normal faults. These faults are characterized by vertical slip rates of 0.7–3.3  mm  yr ⁻¹ and might be associated with the large seismic events of January 1693. We suggest that the main shock of the January 1693 earthquakes ( M ~ 7) could be related to a 45  km long normal fault with a right-lateral component of motion. A long-term net slip rate of about 3.7  mm  yr ⁻¹ is calculated, and a recurrence interval of about 550 ± 50  yr is proposed for large events similar to that of January 1693.  相似文献   

鹿井铀矿田空间定位条件分析   总被引：2，自引：0，他引：2  

张振华  李顺初  翦勋平 《铀矿地质》1999,15(6):338-343

笔者在研究鹿井铀矿田区域地质背景、产铀花岗岩及矿田构造环境的基础上,认为鹿井铀矿田空间定位于特定的区域地质背景及特殊产铀花岗岩体中的独特构造环境中。强调了离散走滑断裂作用（即纵向及横向拉伸作用）控制了鹿井铀矿田的空间分布范围,它是控制鹿井铀矿田的主导因素。  相似文献   

犁式(箕状)断陷盆地的一种模拟方法及其在海拉尔盆地的应用   总被引：1，自引：1，他引：0  

张晓东  李贵顺  李桂荣 《铀矿地质》1999,15(6):361-366

弹性条件下的拉伸速率和由于压实作用而不断变化的沉积物密度满足一定的散度方程。通过有限差分方法解该方程可计算盆地的拉伸量。应用该方法对海拉尔盆地各沉积时期进行了计算,取得了较好的效果,这对盆地的形成和演化以及寻找油气靶区等研究具有一定的指导意义。  相似文献   

Character of active faulting in the North Aegean Sea     

Ruhi Saat&#x;lar  Semih Ergintav  Emin Demirba  Sedat nan 《Marine Geology》1999,160(3-4):339-353

A re-evaluation of the reprocessed seismic reflection data was made for the investigation of the presumed western continuation of the North Anatolian Fault (NAF) in the Aegean and mapping geometries of active faults in the Aegean Sea. Seismic data collected and processed by various national and international companies were selected from the data archives and they were reprocessed after stacking to bring them to the same processing and signal-to-noise ratio standards. The total length of the selected lines is 8000 km. We investigated the character of active faulting in the North Aegean Sea using seismic reflection data. Moreover, the relations of active faults with earthquakes were examined using earthquake fault plane solutions (FPS). We show that the active faults are dominantly normal in character in the NNE Aegean where FPS for earthquakes with M>5 indicate strike-slip movements along these faults. We propose a simple mechanism that potentially explains this inconsistency. Active normal faults are oriented in a NE–SW direction in alignment with the SW escape motion of the Anatolian block in this region and this orientation facilitates instantaneously strike-slip movements along these otherwise normal faults.  相似文献   

���ÿ���-λ��ģ�ͷ��ݻ������������˶��Ͷ��ѻ   总被引：1，自引：0，他引：1  

朱泽  孟国杰  苏小宁  金红林  胡新康  Ge Linlin 《大地测量与地球动力学》2014,34(4):39-42

?????????1999??????GPS?????????д??????????GPS?????????????????????媲λ?????????????????????????????????????????????????????о???????????????壬?о????????????????????С????????????????????????????????????????????????????????????????????????1 mm/a?????κ???α????????????????????????40 km??30 km???????????????????????????????????????1 mm/a??????????????30 km????????????????????????????????1 mm/a?????????????????40 km??  相似文献   

与城市地下生命线工程有关的双层地质结构中的几个问题     

彭一民  孙进忠 《现代地质》1993,7(1):93-101

近代城市地下生命线工程要求对埋藏基岩中的活动断裂作出工程评价,以判断其是否有出现地表破裂的可能。 本文提出了对研究活动断裂的3项内容,即:“活动断裂的活动时间下限、地震复发周期及活动断裂的活动速率;对不同的断裂活动机制,即蠕动和粘滑,从覆盖层厚薄两种情况分析了对地基所产生的影响。 作者通过超声地震模型实验对覆盖层横向非均一性影响地下生命线工程的特点进行了研究,结果表明,横向非均一的覆盖层在地震过程中对地下生命线工程影响显著,不可忽视。  相似文献   

四川汶川Ms 8.0地震地表破裂构造初步调查与发震背景分析   总被引：19，自引：3，他引：19  

董树文  张岳桥  龙长兴  吴珍汉  安美建  张永双  杨农  陈正乐  雷伟志  施炜  石菊松 《地球学报》2008,29(3):392-396

5月16-24日对川西汶川大地震震中区的发震断裂地带进行的实地考察和初步测量,获得了宝贵的地表变形和同震位移最数据资料,证实汶川地震属于逆冲断裂型地震,主破裂沿映秀-北川断裂带发育,前山地区滑灌县-安县断裂也有地表破裂,同震位移量在3～5m.汶川地震产牛的地表破裂构造和运动性质显示明显分段特性,映秀-北川段以挤压逆冲为主,而北川以北段则伴有显著的右旋走滑分量.  相似文献   

塔里木盆地基底卷入扭压构造与巴楚隆起的形成   总被引：3，自引：0，他引：3  

杨明慧  金之钧  吕修祥  潘文庆  胡剑风 《地质学报》2007,81(2):158-165

在板块斜向碰撞中,与走滑断层相伴生的隆升是弯曲挤压的必然结果。印度板块与欧亚板块的斜向碰撞使得塔里木盆地边界和内部发育的基底卷入构造大多表现出逆冲与走滑断裂的双重特征。本文通过地震、钻井和构造几何学、地面资料约束研究表明,巴楚隆起两侧的阿恰-吐木休克和色力布亚-玛扎塔格断裂是由基底卷入构造和扭压构造复合而成的基底卷入扭压构造。这种构造样式的组合包括3个部分,即两端的基底走滑断裂和中段的基底卷入逆冲断裂。巴楚隆起的形成主要与阿恰-吐木休克断裂的基底卷入扭压构造活动有关。巴楚隆起的形成过程具有“跷跷板”特点,可分两个阶段:巴楚隆起前石炭纪沿南缘的玛扎塔格断裂抬升,地层最大剥蚀厚度至少530m;前古近纪,主要剥蚀区沿吐木休克断裂以南展布,推测最大剥蚀厚度超过1100m。巴楚隆起南段的主变形期是在前石炭纪完成的,地层缩短量约占55%;北段推迟到前古近纪,缩短量占55%;而中段的地层缩短量一直在逐步增强,前上新世达到最大,占52%。  相似文献