祁连县国土局严厉打击非法开采砂石资源违法行为     

蔡更藏  马升皓 《青海国土经略》2011,(4):45-45

8月9日至11日,由祁连县国土资源局牵头,县监察、公安、安监、环保、水利、草监七部门组成联合专项整治组,对祁连县境内二尕公路沿线、峨祁公路沿线及默勒镇扎沙村赛什图河、纳子峡沟等区域的砂场进行了全面检查及清理整顿。  相似文献   

山东招远夏甸金矿的成因矿物学研究   总被引：2，自引：0，他引：2  

陈光远  藏维生 《矿产与地质》1987,(1)

胶东金矿带位于郯庐断裂北支——沂沐断裂的东侧,是我国金矿重要产地之一。当地已知金矿床有两大主要成因类型,即石英脉型和蚀变岩型,夏甸金矿床属蚀变岩型。该矿早已发现,曾土法开采。1967年山东省地质局八○七队进行详查,1980年至1981年由○○五二三与○○五二四部队先后进行勘探,同时交由招远县黄金公司边探边采。但由于蚀变岩型矿体与围岩边界不明,矿体分布规律不清,采矿损失率与贫化率较大。同时,由于矿化不均匀,钻孔难以控制,加以地质研究程度较低,垂直分带、剥蚀深度与下部远景不明,给矿山开采设计带来了不少困难。经应用成因矿物学于1984～1986年对该矿山进行地质研究,本文是这一研究工作的初步小结。  相似文献   

新疆准噶尔北缘北塔山组火山岩年龄及岩石成因   总被引：9，自引：7，他引：2  

柴凤梅  杨富全  刘锋  耿新霞  吕书君  姜丽萍  藏梅  陈斌 《岩石学报》2012,28(7):2183-2198

对准噶尔北缘北塔山组辉石玄武岩进行了LA-ICP-MS锆石U-Pb 年龄测定, 获得了玄武岩的喷发年龄380.5±2.2Ma,表明北塔山组火山岩形成于中泥盆世。该地层火山岩中辉石玄武岩和无斑玄武岩的SiO₂含量为47.55%~52.97%、Al₂O₃的含量为8.44%~20.00%、TiO₂为0.5%~1.2%,MgO含量为2.8%~15.35%、CaO为3.98%~14.83%、FeO^T为9.46%~19.23%,具有亚碱性拉斑玄武岩的特征。其微量元素显示富集大离子亲石元素(LILE)和轻稀土元素(LREE),亏损Nb、Ta和Ti,Eu异常不明显。它们具有极低的初始⁸⁷Sr/⁸⁶Sr同位素比值(0.703835~0.704337)和高的ε_Nd(381Ma)值(+6.84~+12.3,t=381Ma)的亏损地幔源区特征。结合区域地质背景,北塔山组火山岩形成于与俯冲作用相关的构造环境,是准噶尔古洋盆于泥盆世时发生的俯冲-消减所引发的岛弧岩浆作用的地质记录。岩浆源区为被流体或沉积物熔体交代改造的地幔楔和软流圈地幔,不同类型的岩石系不同成分的原始岩浆经不同演化过程的产物。  相似文献   

Crust Shortening of the Daliangshan Tectonic Zone in the Cenozoic Era and Its Implications     

Chen Changyun    He Honglin 《中国地震研究》2009,23(1):68-77

The Daliangshan tectonic zone is a rhombic area to the east of the Anninghe and Zemuhe fault zones in the middle segment of the Xianshuihe-Xiaojiang fault system along the southeast margin of the Qinghai-Xizang (Tibet) Plateau. Since the Cenozoic era, the neotectonic deformation in the Daliangshan tectonic zone has presented not only sinistral slip and reverse faulting along the Daliangshan fault zone, but also proximate SN-trending crust shortening. It is estimated that the average crust shortening in the Daliangshan tectonic zone is 10.9±1.6 km, with a shortening rate of 17.8±2.2% using the method of balanced cross-sections. The crust shortening from folding occurred mainly in the Miocene and the Pliocene periods, lasting no more than 8.6 Ma. Based on this, a crust shortening velocity of 1.3±0.2 mm/a can be estimated. Compared with the left offset along the Daliangshan fault zone, it is recognized that crust shortening by folding plays an important part in transferring crustal deformation southeastward along the Xianshuihe-Xiaojiang fault system.  相似文献   

Tectonics and Seismicity of the Yarlung Tsangpo Grand Canyon Region     

Shao Cuiru  You Huichuan  Cao Zhongquan  Wang Chunyong  Tang Fangtou  Zhang Decheng  Lou Hai  Xu Guangyin  Yang Qiyan  Mei Tuo  Xie Ping  Yu Gang 《中国地震研究》2009,23(2):144-160

The Yarlung Tsangpo Grand Canyon region is located in the frontal zone of the eastern Himalayan syntaxis, where neo-tectonics and seismicity are intensive and closely related to each other. In the region, two sets of fault structures have developed, striking NNE-NE and NWW-NW, respectively. Investigation shows that they differ markedly in terms of scope, property, active times and intensity. The NWW-NW trending faults are large in size, and most are thrust and thrust strike-slip faults, formed in earlier times. The NEE-NE-strike faults are relatively small in size individually, with concentrated distribution, constituting the NNE-trending shear extensional fault zone, which is relatively younger with evident late Quaternary activities. Strong earthquakes occur mainly in the areas or zones of intensive differential movement of the Himalayas, e.g. along the deep and large fault zones around the crustal blocks. Most earthquakes of M≥7.0 are closely related to tectonics, where large-scale Holocene active faults are distributed with complicated fault geometry, or the faults of multiple directions intersect. Among them, earthquakes of M≥7.5 have occurred on the NW and NE-trending faults with a greater strike-slip component in the fault tectonic zones.  相似文献   

Primary Quantitative Study on Earthquake Damage Extracted from Remote Sensing Imagery——A Case Study of Seismic Damage in the Urban Area of Dujiangyan due to the M_S8.0 Wenchuan Earthquake     

Wang Xiaoqing  Wang Long  Zhang Xihai  Ding Xiang  Qiu Hu  Dong Yanfang  DouAixia  Zhang Feiyu  Liu Zaitao 《中国地震研究》2009,23(4):392-401

The fast developing remote sensing techniques play an increasingly important role in earthquake emergency response, disaster survey and loss estimation. As there is a lack of quantitative studies on seismic damage based on remote sensing, its practicality in seismic disaster management has usually been questioned. The paper introduces the essential quantitative study idea, the concept of the remote sensing seismic damage index (DRS_I RS) and analysis models, demonstrates the seismic damage indices (DG_IC) of buildings obtained from ground surveying and its quantitative relation to DRS_I RS in Dujiangyan city, Sichuan Province, which was destroyed by the 2008 Wenchuan earthquake with M_S8.0. The primary results show that an obvious relationship exists between the DRS_I RS of buildings obtained from the high resolution satellite or aerial remote sensing images and DG_I C or the building collapse ratio obtained through ground survey, which suggests that the quantitative study on seismic damage based on remote sensing will provide an effective method for seismic damage survey and loss estimation.  相似文献   

加拿大华裔少年寄回长城砖     

万容  ;袁世明藏石摄影 《地球》2009,(6):78-78

2005年3月中旬,八达岭路城的工作人员意外收到了特殊“礼物”：一块古城砖和两封道歉信。  相似文献   

沉积白云石形成条件的试验研究   总被引：1，自引：0，他引：1  

王亚烈  蒋汶田  李钟鸣  藏广才  贺玉贞 《地球学报》1996,17(Z1):112-119

经过大量试验研究工作，总结出在常温常压条件下，全成碳酸盐矿物的控制因素和形成条件，合成出原白云石（无序白云）等一系列碳酸盐矿物.原白云石经加温加压，在100℃或150℃转化为白云石（有序白云石）.  相似文献   

使用系统重构方法建立大庆油田地面工程规划数据库系统     

毕硕本  藏天仪 《东北测绘》1999,22(3):36-36,32

本文结合现有的大庆萨南油田地面工程规划数据库系统开发和管理的经验,介绍了对建立大庆油田地面工程规划数据库系统的认识,以指导开发和研制工作。首先介绍了对规划数据库系统重构工作的认识,随后给出了规划数据库系统重构应遵循的原则,最后说明了规划数据系统重构的一般过程。  相似文献   

2023年4—5月寒潮天气过程对新疆棉花播种出苗及苗期生长的影响     

黄娟  黄健  吴新国  姚艳丽 《沙漠与绿洲气象(新疆气象)》2023,17(6):75-82

基于新疆105个国家站2023年4—5月气象观测数据和同期棉花生长发育的物候资料,选取日平均气温≤12℃的持续天数作为棉花苗期低温冷害等级指标,采用GIS空间加权综合评判法对棉花苗期生长低温冷害修正后的指标进行划分,结果表明：4月,播种后棉花出苗缓慢,北疆部分棉区、巴州北部棉区、阿克苏地区已播种的棉花出现烂种烂芽、棉苗立枯病等现象;5月上旬,全疆棉区气温持续偏低,多降水碱灾、低温霜冻及局地冰雹等灾害天气,致使棉田土壤板结,棉花出苗困难,5月下旬,多地出现强对流天气,冰雹、强降水导致棉花受灾;4月较重度、重度苗期低温冷害的棉区有：北疆沿天山一带大部分棉区,鄯善、哈密市、巴州北部部分棉区,克州部分棉区;5月较重度、重度苗期低温冷害的棉区有：昌吉州、哈密市北部、巴州北部、克州部分;综合4—5月新疆棉区日最低气温≤0℃的持续日数、大风日数、日平均相对湿度情况分析,北疆沿天山一带的大部分棉区、吐鲁番市、巴州棉区、阿克苏地区东部的棉花受冻较严重,需及时补苗,关注棉花后期生长状况。  相似文献