Tanlu Fault Zone and Gold Ore Metallogenesis     

SHEN Yuanchao  ZENG Qingdong  LIU Tiebing 《东北亚地学研究》2002,(1)

Tanlu Fault Zone (TFZ) is a large NE trending deep fracture system in East China and is about 2500 km long. It extends from the south of Lujiang to Tancheng, and passes through the Bohai Sea and continues to the north, where it branches into Yilan ?Shulan Fault and Dunhua ?Mishan Fault. TFZ is a long lasting huge deep - rooted lithospherical fault system with different characteristics in different parts and at different periods of its evolution. TFZ also controls the distribution and occur-rences of many superlarge, large, middle and small sized gold ore deposits, e. g. Jiapigou, Haigou, Xiaoxihancha and Ciwei-gou gold deposits in Northeast China; Linglong, Jiaojia, Sanshandao, Taishang, Xincheng, Rushan, and Pengjiakuang gold deposits in Jiaodong Peninsula of Shandong Province; and Guilaizhuang and Yinan in Western Shandong Province.  相似文献   

华北克拉通破坏与岩石圈减薄   总被引：20，自引：2，他引：18  

嵇少丞  王茜  许志琴 《地质学报》2008,82(2):174-193

古太古代（约4.0 Ga）时地球上可能只有一个超级大陆, 它的岩石圈厚度高达400 km。在早元古代,这个超级大陆减薄、裂解成十几块,每块中心是太古宙岩石,边缘是元古宙岩石,且各块厚度不等（150~350km）。从元古宙之后这些被称之为稳定克拉通的大陆岩石圈就一直漂游在地幔软流圈之上。中国华北地块就是这些克拉通之一,与众不同的是它在中生代时遭受了第二次破坏,岩石圈厚度从古生代时的180~200 km 减少到现今的80~100 km。本文作者从流变学的视角出发,围绕华北克拉通破坏和岩石圈减薄这一核心问题,从  相似文献   

郯庐断裂带的断裂活动对渤海东部中、新生代裂谷盆地发育的控制作用     

李桂群  李学伦 《中国海洋大学学报(自然科学版)》1988,(4)

郯庐断裂带自南而北穿越渤海东部,自中生代中期至新生代中期表现裂谷发育特征。裂谷发育经历两个旋回,各旋回的裂谷发育演化、盆地分布格局,沉积相带,沉积补偿速度等均受断裂带的断裂活动的强烈控制。  相似文献   

中朝板块元古宙板内地震带与盆地格局   总被引：34，自引：3，他引：34  

乔秀夫 《地学前缘》2002,9(3):141-149

地史中发生的强地震事件在地层中留下固定的记录 (图 1～ 3) ,这些记录在区域上呈带状分布 ,代表地史中的地震带。中朝板块元古宙目前可识别出两个板内地震带 (图 5 )。中元古代板内地震带 (170 0～ 12 0 0Ma)西起太行山北段 ,经燕山山脉、辽宁西部、穿越辽河平原至辽宁北部的泛河流域分布 ,即燕山—泛河地震带 ,现今呈NEE向延伸。新元古代震旦纪地震带沿吉林南部、辽东半岛、山东中部及苏皖北部现今呈NNE走向分布 ,即古郯庐地震带 (6 5 0～ 6 0 0Ma)。上述两个板内地震带是元古宙不同时期超大陆裂解的响应。中元古代与新元古代两个不同方向的地震断裂带分别控制着两个时期的盆地边界。燕山泛河地震断裂带构成中元古代海盆南界 (指现在的位置 ) ,形成向北开放的海域。古郯庐地震断裂带将中朝板块裂解为华北块体与胶辽朝块体。古郯庐地震断裂带构成震旦纪海域的边界 ,震旦纪海盆通过朝鲜半岛与当时的外海相连接 ,华北块体则为陆源剥蚀区。文内四幅古地理图 (图 6～ 9)是以地震灾变思想为指导 ,以新的地层研究、对比为基础编制的 ,侧重反映了盆地的格局及其变化。根据地震、同沉积断裂新的思路 ,可提供地质学家重新认识与解释某些沉积矿床的成因 ,它们的成矿元素均来自地球深部而非地表风化作用。文中编制  相似文献   

Seismic Sequence in Carbonate Rocks By Vibrational Liquefaction1     

Qiao Xiufu  Song Tianrui  Gao Linzhi  Peng Yang  Li Haibing  Gao Mai  Song Biao  Zhang Qiaoda 《《地质学报》英文版》1994,7(3):243-265

Abstract On the basis of the records of strong seismic events taking place in soft carbonate sediments, a new seismic sequence system of vibrational liquefaction is established, which consists of a series of units, such as escaped structure of micrite veins and liquefied deformation formed in the period of seismic liquefaction, land subsidence structure after liquefaction, tsunamic hummocky and turbidite produced by seismic events, This sequence is a generalization and summation of field observation in vast areas, which shows the whole process of a strong seismic event and provides an unified theoretical explanation. The pattern of the seismic sequence by vibrational liquefaction provides one of correlation standards for geologists in the field to discriminate events in carbonate sequences. Based on the pattern of seismic sequence, the authors first advance a new conception of the Palaeo - Tanlu (Tancheng - Lujiang) Zone and discuss primarily its geological significations.  相似文献   

东营凹陷八面河北部斜坡带构造特征及形成机制     

张蕾 《山东国土资源》2015,31(6)

研究了东营凹陷八面河北部斜坡带的断裂特征、构造演化特征及其形成机制,明确了该区的断裂展布特点和断层活动性,弄清了北部斜坡带的演化规律,同时分析该区的构造变形特征。结果表明：中生代以后,八面河地区存在2种独立的构造变形系统：一是板块边缘相互作用力;二是到后期由于板块的持续俯冲,地幔底辟作用在岩石圈底面产生的牵引力。八面河北部地区在这2种构造力的综合作用下,不同时期表现出不同的构造变形特征。  相似文献   

A multi-scale 3-D crust velocity model in the Hefei-Chao Lake area around the southern segment of Tanlu Fault Zone          下载免费PDF全文

Lingli Li  Huajian Yao  Song Luo  Junhui Li  Xiaoli Wang  Hongyu Ni  Ziwen Bao 《地震科学（英文版）》2021,34(4):344-357

Regional high-precision velocity models of the crust are an important foundation for examining seismic activity, seismogenic environments, and disaster distribution characteristics. The Hefei-Chao Lake area contains the main geological units of Hefei Basin, with thick sediments and the Chao Lake depression. Several major concealed faults of the southern NNE-trending Tanlu Fault Zone cross this area. To further explore the underground distribution characteristics of the faults and their tectonic evolutionary relationship with adjacent tectonic units, this study used ambient noise data recorded by a seismic array deployed in Hefei City and Chao Lake, constructing a 3-D velocity model at the depth of 1–8 km. Then a multi-scale high-resolution 3-D velocity model of this area was constructed by this new upper crustal velocity model with the previous middle and lower crustal model. The new model reveals that a high-velocity belt is highly consistent with the strike of the Tanlu Fault Zone, and a low-velocity sedimentary characteristic is consistent with the Hefei Basin and Chao Lake depression. The distribution morphology of high and low velocity bodies shows that the sedimentary pattern of Hefei-Chao Lake area is closely related to the tectonic evolution of the Tanlu Fault Zone since the Mesozoic. This study also identifies multiple low-velocity anomalies in the southeastern Hefei City. We speculate that strong ground motion during the 2009 Feidong earthquake (magnitude of 3.5) was related to amplification by the thick sediments in the Hefei Basin. We also discuss further applications of multi-scale high-resolution models of the shallow layer to strong ground motion simulations in cities and for earthquake disaster assessments.  相似文献   

Fault detection by reflected surface waves based on ambient noise interferometry     

《地震研究进展（英文）》2021,1(4):100035

Detecting subsurface fault structure is important for evaluating potential earthquake risks associated with active faults. In this study, we propose a new method to detect faults using reflected surface waves observed in ambient noise cross correlation functions. Ambient noise tomography using direct surface waves obtained from ambient noise interferometry has been widely used to characterize active fault zones. In cases where a strong velocity contrast exists across the fault interface, fault-reflected surface waves are expected. We test this idea using a linear array deployed in the Suqian segment of Tanlu fault zone in Eastern China. The fault-reflected surface waves can be clearly seen in the cross-correlation functions of the ambient noise data, and the spatial position of the fault on the surface is close to the stations where the reflected signals first appear. Potentially reflected surface waves could also be used to infer the dip angle, fault zone thickness and the degree of velocity contrast across the fault by comparing synthetic and observed waveforms.  相似文献   

郯庐断裂带(安徽段)对地表水系空间分布形态的影响研究          下载免费PDF全文

钱家忠  卫佳佳  姜琼  郑勇  赵卫东 《地质科学》2019,54(2):398-410

为了研究郯庐断裂带(安徽段)构造活动对其周边地表水系形态及其发育特征的影响,本文基于DEM数据,利用GIS空间分析功能并结合郯庐断裂带构造运动特征,对郯庐断裂带(安徽段)周边水系的几何分布特征进行研究。研究表明:郯庐断裂带(安徽段)在不同地质历史时期对区内地表水系产生错动影响。受郯庐断裂三叠纪到白垩纪期间左旋走滑运动影响,两条二级水系在大别山区自西北向东南流经郯庐主干断裂及次级断裂时与断裂呈近似直角相交并发生左旋错动。大别山地区的皖河流域与华阳河流域水系受郯庐断裂第四纪以来逆右行平移运动影响流向由东南向同步大幅度拐向南西,表现为右旋扭错;巢湖流域水系受五河—合肥断裂和石门山断裂影响也出现了右旋位错。此外,受郯庐断裂带构造运动形成的合肥盆地和地堑式嘉山盆地的影响,池河的主河道沿合肥盆地东侧的沉降带和石门山断裂与嘉庐断裂之间的嘉山盆地发育。  相似文献   

郯庐断裂带苏鲁界地应力积累特征及地震危险性研究     

邱君  吴满路  范桃园  张重远  王连山 《地质学报》2019,93(12):3249-3258

郯庐断裂带是中国东部重要的地质构造带和地震活动带,苏、鲁交界部位的地震活动性和强震危险性一直引人瞩目,1668年发生过郯城8.5级大地震。为了解郯庐断裂带苏鲁界现今地应力环境与地震发展趋势,应用水压致裂法在该区开展了一个钻孔的原地应力测量工作,同时参考前人利用钻孔崩落法与声发射法获取的中国大陆科学钻探(CCSD)主孔301～5047m深度范围内的地应力数据,揭示了研究区地应力状态。利用库伦破裂准则、Byerlee定律以及断层摩擦参数μ_m分析研究该地区的地应力积累水平,评估断层发生滑动的可能性。结果表明:水压致裂法测点在75.74～191.04m深度范围内最小水平主应力的量值为3.68～13.15MPa,最大水平主应力的量值为4.02～19.40MPa。CCSD主孔在1269～5047m深度范围内最小水平主应力的量值为25.3～122.0MPa,最大水平主应力的量值为41.4～166.4MPa;分析地应力结构,发现自地表至660m的范围内,σ_Hσ_hσ_v,为逆断层地应力状态,660m以下表现为σ_Hσ_vσ_h,为走滑断层地应力状态。综合分析断层摩擦参数μ_m,郯庐断裂带苏鲁交界处尚未达到断层失稳的临界地应力状态。  相似文献