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71.
72.
对玲珑—焦家矿集区几个关键地质问题的认识 总被引:10,自引:0,他引:10
玲珑—焦家矿集区受伸展-走滑联合构造应力场控制,其矿体倾向与倾角以及侧伏向与侧伏角皆受上述构造动力学条件制约;成矿构造系列类型为伸展-走滑复合型,并可分为四个亚系列;脆性域成矿过程可分解为雏形断裂与宏观断裂两个阶段,而雏形断裂阶段成矿在矿集区十分普遍。讨论了矿集区几种关键构造的型式与性质,并对成矿远景做了初步评估。 相似文献
73.
利用遥感资料 ,通过野外实地考察并结合气候地貌事件的分析 ,对斜切北天山、长逾70 0km的博阿断裂 (博罗科努 -阿齐克库都克断裂 )的右旋走滑运动进行了定量研究。该断裂分为西部NW向断裂和东部NWW向断裂。西部NW向断裂长近 2 5 0km ,向西北延伸进入哈萨克斯坦 ,右旋走滑速率可达 5mm/a ;由 4~ 5个断裂段组成 ,其上发育 3~ 4条古地震或历史地震形变带 ,显示具有发生 7.5级地震的能力。东部NWW向断裂右旋走滑速率 1~ 1.4mm/a ;其上发现小规模古地震形变带 ,显示具备发生 7级左右地震的能力。该断裂与山前的逆冲推覆构造之间构成典型的挤压区应变分配形式 ,即在斜向挤压作用下 ,变形分配为山前的逆冲推覆构造和山内的走滑断裂 相似文献
74.
An inventory of artesian springs emerging from fractures (fracture springs) was conducted in the Pinh?o River Basin and Morais
Massif, northern Portugal, comprising an area of approximately 650 km2. Over 1,500 springs were identified and associated with geological domains and fracture sets. Using cross-tabulation analysis,
spring distributions by fracture sets were compared among geological environments, and the deviations related to differences
in rock structure and, presumably, to differences in deformational histories. The relation between spring frequencies and
rock structures was further investigated by spectral determination, the model introduced in this study. Input data are the
spring frequencies and fracture lengths in each geological domain, in addition to the angles between fracture strikes and
present-day stress-field orientation (θ). The model's output includes the so-called intrinsic densities, a parameter indexing spring occurrence to factors such as
fracture type and associated deformational regime and age. The highest densities (12.2 springs/km of lineament) were associated
with young shear fractures produced by brittle deformation, and the lowest (0.1) with old tensional and ductile fractures.
Spectral determination also relates each orientation class to a dominant structural parameter: where spring occurrence is
controlled by θ, the class is parallel to the present-day stress-field orientation; where the control is attributed to the length of fractures,
the spring occurrence follows the strike of large-scale normal faults crossing the region.
Electronic Publication 相似文献
75.
郯庐断裂带南段并无巨大平移—来自安徽境内的证据 总被引:26,自引:3,他引:26
本文根据新近1:5万地质填图和构造调查所获资料,依据郯庐断裂带两侧标志地质体(西冷岩组火山岩,宿松岩群和肥东岩群中磷矿层,大别岩群和阚集岩群)的构造型式和错位情况,拉伸线理的性质和动向,以及郯庐断裂带两侧的次级断裂带特征等,都不能判定郯庐断裂带存在巨大左行平移,故认为大别-苏鲁造山带呈弧形展布,基本代表了原始构造方位,郯庐断裂带是多期构造变动形成的负向构造带,综合造就的一种假位错效应。 相似文献
76.
Mecislovas Zalakevicius 《GeoJournal》2002,57(3):183-193
This paper presents data obtained from studies of the dependence of different migratory processes - spring arrival, migratory
take-off, spring and autumn en route migration–upon climate change in Lithuania. The article confirms the impact of global
climate warming on different breeding bird species and populations, changes in their ranges and population state, and their
staging and wintering areas. The list of bird species which are shifting their ranges north-eastward or eastward in the Baltic
region under the influence of global warming is presented. It was established that the impact of global climate change upon
birds of terrestrial and wetland complexes is more evident than upon waterfowl. Attention is focussed on the practical importance
of the global climate change impact on environmental protection and different branches of the economy.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
77.
Gonghua Song Maomao Wang Danqi Jiang Zhuxin Chen Bing Yan Wang Feng 《Basin Research》2021,33(1):210-226
Along‐strike structural linkage and interaction between faults is common in various compressional settings worldwide. Understanding the kinematic history of fault interaction processes can provide important constraints on the geometry and evolution of the lateral growth of segmented faults in the fold‐and‐thrust belts, which are important to seismic hazard assessment and hydrocarbon trap development. In this study, we study lateral structural geometry (fault displacement and horizon shortening) of thrust fault linkages and interactions along the Qiongxi anticline in the western Sichuan foreland basin, China, using a high‐resolution 3D seismic reflection dataset. Seismic interpretation suggests that the Qiongxi anticline can be related to three west‐dipping, hard‐linked thrust fault segments that sole onto a regional shallow detachment. Results reveal that the lateral linkage of fault segments limited their development, affecting the along‐strike fault displacement distributions. A deficit between shortening and displacement is observed to increase in linkage zones where complex structural processes occur, such as fault surface bifurcation and secondary faulting, demonstrating the effect of fault linkage process on structural deformation within a thrust array. The distribution of the geometrical characteristics shows that thrust fault development in the area can be described by both the isolated fault model and the coherent fault model. Our measurements show that new fault surfaces bifurcate from the main thrust ramp, which influences both strain distribution in the relay zone and along‐strike fault slip distribution. This work fully describes the geometric and kinematic characteristics of lateral thrust fault linkage, and may provide insights into seismic interpretation strategies in other complex fault transfer zones. 相似文献
78.
惠民凹陷东部区域性走滑断裂构造系统的发现和意义 总被引:3,自引:3,他引:3
惠民凹陷东部地区油气勘探程度相对较低,岩浆活动剧烈,深部地质构造复杂。为此,通过岩石物性特征的研究和引起重、磁异常的地质因素分析,将重、磁、震综合地球物理解释技术应用于解决盆地深层地质构造问题,确定了重力和磁力异常在研究区的分布特征,结合地震资料解释发现了近SN向延伸的滨县-高青-博山区域性右旋走滑断裂构造系统和NNW向延伸的白桥-文祖区域性左旋走滑断裂构造系统。这两条区域性走滑断裂构造系统对本区中新生代构造格局具有重要控制作用,并控制了研究区内线性分布的火山活动和幔源CO2气的分布。 相似文献
79.
渤海湾盆地新生代的走滑活动及其石油地质意义 总被引:15,自引:6,他引:9
渤海湾盆地新生代构造运动具有统一的右旋走滑特征 ,平面上具有自东向西由强变弱的特点 ,时间上走滑活动具有由老至新逐渐变弱的趋势。走滑作用对渤海湾盆地新生代的构造演化、沉积充填、油气生成、圈闭类型及形成等方面有明显的控制作用。本文特别指出了走滑作用对火山岩油气藏的控制作用。 相似文献
80.
Kobayashi Kenta Matsuoka Atsushi Yang Qun Nagahashi Toru Takei Masahiko Zeng Qinggao Wang Yujin 《地学前缘》2000,(Z1)
INVERSION OF STRIKE-SLIP MOVEMENTS ALONG THE YARLUNG ZANGBO SUTURE ZONE, TIBET 相似文献