Main Feature and Potential Seismic Capability of Active Fault Belts in the Chengdu Depression     

Tang Rongchang  Huang Zuzhi  Qian Hong  Gong Yu  Wen Dehua  Ma Senghao  and Zhou RongjunSeismological Bureau of Sichuan Province  Chengdu  China 《中国地震研究》1997,(1)

Chengdu fault depression is an important Quaternary basin in the piedmont of Longmenshan mountain.Formation and evolution of the fault depression are entirely controlled by the Longmenshan piedmont fault and the Longquanshan fault.Since the late Quaternary,Chengdu fault depression has been subjected to an NW-SE oriented compression.Many NE or NNE trending faults inside the depression or near its margins show thrust slip,resulting in moderate and strong earthquakes along the piedmont Longmenshan fault,the western slop Longquanshan fault,and Pujiang-Xinjin-Chengdu-Deyang fault.It is indicated that three faults as mentioned above have the potential capability for the occurrence of moderate earthquakes.  相似文献   

西藏措勤地区“乌郁群”上部有孔虫化石的发现及其地层意义     

石和胡新伟  马润则陶晓风　刘登忠 《地质通报》2001,20(4):348-351

西藏措勤地区“乌郁群”上部是一套红色碎屑沉积,原来被认为属湖沼相,划归上新统.在1∶25万措勤县幅区调中,在这套碎屑沉积中发现一些含较丰富有孔虫、固着蛤化石的灰岩层.根据有孔虫化石组合,措勤地区的“乌郁群”上部应为滨浅海相沉积,其时代归属为早白垩世晚期至晚白垩世早期(Aptian-Cenomanian).  相似文献   

Segmentation of Active Faults and Risk Probability Prediction of Strong Earthquakes in Sichuan Province     

Tang Rongchang  Huang Zuzhi  Zhou Rongjun  Zhu Jiangang  and Gong YuSeismological Bureau of Sichuan Province  Chengdu  China 《中国地震研究》1996,(1)

Based on geometric structure,active strength,and maximum seismic rupture length along the fault in the late Quaternary or Holocene,this paper presents the segmentation of main active faults in Sichuan Province and uses the recurrence probability model to predict the recurrence probabilities of strong earthquakes along each segment during next 30 years.The results indicate that earthquakes with M=7.0 or greater may happen along Qiajiao segment,Qianning segment,and Selaha segment of Xianshuihe fault zone,the segment from Xichang to Mianning and Yejidong segment of Anninghe fault zone; earthquakes with M=6.0 or greater may happen along the segment from Maowen to Caopuo of Longmenshan fault zone and Xiaoyanjing segment of Anninghe fault zone.  相似文献   

川北下侏罗统自流井组大安寨段灰岩非常规储层包裹体研究   总被引：5，自引：0，他引：5  

郑荣才  刘文均 《地质论评》1997,43(5):515-523

通过对川北大安寨段灰岩非常规储层流体包裹体的系统研究，表明该储层的成因与多期次的深部溶蚀作用有关，可划分为成岩期，构造期和构造期３个溶蚀期及５个次生矿物沉淀阶段，各阶段流体包裹体类型丰度，形态，均一温度，盐度、密度和成分特征各相相同，显示溶蚀流体来自油源岩区于不同演化阶段排出的无机和有机流体，因而包裹体的各项牲和演化规律可作为评价和预测大安寨段非常规储层的标志。  相似文献   

INTEGRATED MANAGEMENT PLAN OF SEDIMENT AND ECOLOGICAL RESTORATION IN WATERSHEDS, A CASE STUDY IN CHINA     

Shuyou CAO  Xingnian LIU  Changzhi LI  Xiaozhang LEI  Er HUANG  Hualong DAI 《国际泥沙研究》2003,(2)

1 INTRODUCTION Soil erosion is serious in Western China. With the implementation of a development strategy for western China, soil and water conservation and ecological restoration in western China earn more attention because economic development requires parallel efforts on ecological restoration. To protect the ecology of the upper reaches of the Yangtze River, integrated management of sediment and ecological restoration are being conducted in Sichuan Province. The Yufeng Watershed…  相似文献   

卫星遥感热红外辐射信息与云南永胜6.0级地震     

刘放  程万正  但尚铭 《地震研究》2003,26(2):120-125

对利用气象卫星遥感热辐射信息进行地震监测预报时必须考虑的不同星号、不同通道、不同时段及不同分辨率等问题进行了讨论，并为此进行了多种应用方法的计算和比较，介绍了相应的气象卫星遥感热辐射信息资料处理方法及研制的计算软件。在此基础上，对200l年10月27日云南水胜6．0级地震前的卫星遥感热辐射信息及其异常的时空分布特征进行了分析和研究。研究表明：地震前一个月左右，从计算结果中可以发现明显的高频次异常图像；同时，在空间分布上呈现出“大范围减温异常一大范围增温异常-地震”这样一个过程。  相似文献   

亚洲地震委员会第四次学术大会于2002年11月在尼泊尔加德满都举行     

朱传镇  吴忠良  易桂喜  王夫运  郑重  赵凤新 《国际地震动态》2003,(1):18-21

亚洲地震委员会（ASC）第四次学术大会暨地震学、地震危险性评估和地震风险管理学术讨论会于2002年11月24－26日在尼泊尔加德满都举行。来自亚洲、大洋洲、美洲和欧洲的22个国家的近200名专家出席了会议，会议共收到约110篇研究报告。文章介绍了大会、学术交流和ASC工作会议等情况。  相似文献   

峨眉山大火成岩省的形成机制及空间展布:来自沉积地层学的新证据   总被引：57，自引：6，他引：57       下载免费PDF全文

何斌  徐义刚  肖龙  王康明  沙绍礼 《地质学报》2003,77(2):194-202

对西南地区茅口灰岩生物地层对比和峨眉山玄武岩与茅口灰岩之间的界面特征的研究表明,上扬子西缘茅口灰岩在玄武岩喷发前存在差异剥蚀,自西到东可分为深度剥蚀带(内带)、部分剥蚀带(中带)、古风化壳或短暂沉积间断带(外带)和连续沉积带;整个剥蚀区的范围同峨眉山玄武岩分布区基本一致。差异剥蚀是中二叠世晚期上扬子西缘一次快速地壳抬升和穹状隆起的结果,这说明峨眉山大火成岩省的形成与地幔柱活动有关。根据上升地幔柱地表抬升模型对峨眉山大火成岩省空间展布进行了讨论,并推算出该大火成岩省的规模。  相似文献   

四川某难浸金矿的矿石性质研究     

张永奎  宋航 《矿物岩石》2003,23(4):80-84

四川某金矿是一种难浸金矿，因为矿石中的金被包裹于含铁硫化矿物中，而且含有机炭质物。细菌Hst能有效氧化金矿中的硫化矿物以提高金的浸出率。如果细菌氧化矿石中铁的浸出率大于90％，金几乎完全解离，金的氰化浸出率大于90％。研究表明，该金矿的难浸特性是因为金包裹于含铁硫化矿物中，有机炭质物和粘土矿物对金浸出影响甚微。  相似文献   

Elemental Geochemical Anomaly in the Sinian Doushantuo Formation-Dengying FormationBoundary in Miaohe, Hubei     

YANG Jian Southwest Institute of Technology  Mianyang  Sichuan  DING Lianfang Xi''an Engineering University  Xi''an  Shaanxi 《《地质学报》英文版》1998,72(2):198-206

No research has been made on such a lower rank boundary as the Sinian Doushantuo Formation-Dengying Formation boundary in the eastern region of the Yangtze Gorges. Elemental geochemical determination has revealed anomalies of REE and other trace elements around the boundary, which have relatively high contents than those in its overlying and underlying beds. The authors therefore think that a catastrophic event once occurred in the Miaohe area at the end of the Doushantuoan Period, which caused the mass extinction of the Miaohe biota.  相似文献