内蒙古赤峰市白音诺尔铅锌矿床构造控制与找矿方向   总被引：3，自引：3，他引：3  

曾庆栋  刘建明  万志民  于昌明  叶杰  刘红涛 《大地构造与成矿学》2007,31(4):430-434

位于大兴安岭中段的内蒙古赤峰市白音诺尔铅锌矿产于二叠纪黄梁组地层中。矿床矿体主要呈层状、似层状、透镜状产出。控矿因素研究表明,层状、透镜状矿体分布主要受褶皱构造控制。根据褶皱控矿规律指出了三个找矿方向,部分区段得到地球物理验证,白音诺尔铅锌矿床具有良好的成矿前景。  相似文献   

Deep Seismogenic Environment in the Southern Section of the Longmenshan Fault Zone on the Eastern Margin of the Tibetan Plateau and Lushan Ms 7.0 Earthquake   总被引：1，自引：1，他引：0  

LI Dahu  DING Zhifeng  ZHAN Yan  WU Pingping  YE Qingdong 《《地质学报》英文版》2015,89(2):519-530

The 2,026 earthquake events registered by the Sichuan regional digital seismic network and mobile seismic array after the April 20 th,2013 Lushan earthquake and 28,188 pieces of data were selected to determine direct P waves arrival times. We applied the tomographic method to inverse the characteristics of the velocity structure for the three-dimensional(3D) P wave in the mid-upper crust of the seismic source region of the Lushan earthquake. The imaging results were combined with the apparent magnetization inversion and magnetotelluric(MT) sounding retest data to comprehensively study the causes of the deep seismogenic environment in the southern section of the Longmenshan fault zone and explore the formation of the Lushan earthquake. Research has shown that there are obvious differences in velocity structure and magnetic distribution between the southern and northern sections of the Longmenshan fault zone. The epicenter of the Lushan earthquake is located near the boundary of the high and low-velocity anomalies and favorable for a high-velocity section. Moreover,at the epicenter of the Lushan earthquake located on the magnetic dome boundary of Ya’an,the development of high velocity and magnetic solid medium favors the accumulation and release of strain energy. Lowvelocity anomalies are distributed underneath the are of seismogenic origin,The inversion results of the MT retest data after the April 20 th Lushan earthquake also indicate that there a high-conductor anomaly occurs under the area of seismogenic origin of the Lushan earthquake,Therefore,we speculated that the presence of a high-conductivity anomaly and low-velocity anomaly underneath the seismogenic body of the Lushan earthquake could be related to the existence of fluids. The role of fluids caused the weakening of the seismogenic layer inside the mid-upper crust and resulted in a seismogenic fault that was prone to rupture and played a triggering role in the Lushan earthquake.  相似文献   

克里雅河尾闾绿洲浅层地下水位埋深变化特征研究   总被引：2，自引：0，他引：2  

唐敏  张峰  师庆东 《干旱区地理》2021,44(1):80-88

地下水位埋深的动态变化极大程度上控制着荒漠植被。达理雅博依位于克里雅河尾闾,是塔克拉玛干沙漠腹地现存面积最大的一处由荒漠河岸林构成的天然绿洲,在这里对地下水位埋深动态变化的监测有助于研究其对地表植被的影响,从而进一步揭示天然绿洲形成与维系的机理。由于复杂的地理环境和闭塞的交通,尚未有学者在该绿洲获得连续的地下水位埋深监测数据。于2012年10月在尾闾绿洲腹地设立了观测井,获取了2012-2018年间地下水位埋深数据,从地下水位埋深的日极值分布特征、日极差分布特征、年内和年际波动特征4个方面分析了该井近6 a来水位埋深的动态变化过程,并结合胡杨的生长习性探讨了尾闾绿洲地下水位埋深变化对生态系统的可能影响。对该绿洲地下水位埋深数据观测结果的初步分析表明:(1)测井每日水位埋深最小值多出现在16:00、20:00与04:00;每日水位埋深最大值多出现在16:00,分布于4-10月,尤以9月为多。(2)地下水位埋深日极差波动范围为0~0.5 m。大于0.1 m的日极差主要分布于7-8月,并以2017年最为显著。(3)地下水位埋深基本在1.0~3.0 m波动,月峰值主要出现在2-3月与8-9月。(4)地下水位埋深多年平均值为2.0 m,水位埋深总体呈缓慢上升,约0.08 m·a^-1。(5)各年水位埋深在1.0~2.0 m的总天数呈增加趋势,利于胡杨种子萌发与植株扎根;在2.0~4.0 m的总天数呈减少趋势,青壮胡杨生长可能受限。  相似文献   

Prediction of hidden Au and Cu–Ni ores from depleted mines in Northwestern China: four case studies of integrated geological and geophysical investigations     

Ping Shen  Yuanchao Shen  Tiebing Liu  Guangming Li  Qingdong Zeng 《Mineralium Deposita》2008,43(5):499-517

Integrated geological and geophysical investigations were carried out in 26 active mines in Northwestern China during the period 2001–2006 to explore for hidden extensions of known ore bodies and to search for new mineralization. This paper presents four case studies from northwest China: the Kuoerzhenkuoa volcanogenic hydrothermal gold deposit, the Nanjinshan breccia-associated gold deposit, the Duolanasayi deposit, associated with a ductile–shear zone, and the Hulu magmatic Cu–Ni sulfide deposit. In these studies, detailed mine-scale geological studies were carried out to determine the location and controls on ore formation. Based on these investigations and a review of previous exploration data, genetic models for the deposits were evaluated, and specific new targets were generated. These target areas were tested with surface geophysical surveys using the Stratagem EH4 system, a hybrid-source magnetotellurics (MT) method. Analysis of the data obtained in the surveys identified geophysical target anomalies that were subsequently drilled. Many of these test holes demonstrate the presence of Au and Cu–Ni mineralization. Evaluation of the geological models was crucial in developing conceptual targets as a basis for surface geophysical surveys. These models established the most likely target areas where Au and Cu–Ni mineralization could occur, but they did not define the limits or the geometries of the mineralized zones. Hybrid MT surveys played an important role in defining the location of buried mineralized systems and in testing the validity of the conceptual targets. The resistivity cross-sections obtained by imaging the MT data established the boundaries and geometries of the host rocks, including the distribution of lithology, structures, alteration, and mineralization. The four case studies in this paper show how this integrated geological and geophysical approach was used successfully to discover hidden mineral deposits.

Ping ShenEmail:

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山东乳山石英脉型金矿侧伏规律及找矿方向   总被引：5，自引：0，他引：5  

沈远超  曾庆栋 《黄金地质》1999,5(3):1-5

山东乳山中部发育石英脉型金矿,金矿分布和产出受ＮＮＥ向及ＮＥＥ向断裂构造控制,具有棋盘格式分布规律,其中ＮＮＥ向断裂是区内金矿脉的定位构造。金矿床矿体侧伏具有同一断裂带分布的不同金矿床矿体侧伏方向两两相反,相邻断裂带中的金矿床矿体侧伏方向相同的规律。根据矿体侧伏规律指出了找矿方向。  相似文献   

新疆东昆仑鸭子泉蛇绿岩的基本特征及其大地构造意义   总被引：19，自引：2，他引：17  

杨金中  沈远超 《现代地质》1999,13(3):309-314

鸭子泉蛇绿岩位于新疆东昆仑祁漫塔格山系中部, 与阿尔金断裂平行产出, 由超基性岩、基性岩和拉斑玄武岩等组成。它侵位于早石炭世含放射虫的深海沉积物中, 可能代表了东昆仑祁漫塔格地区晚古生代的板块俯冲带。蛇绿岩可能来源于俯冲带附近的由小型扩张中心形成的次生洋壳, 之后由于消减作用, 侵位到深海沉积物中, 形成了造山带中的蛇绿岩。  相似文献   

山东省乳山金矿隐伏矿体定位预测   总被引：6，自引：3，他引：3  

曾庆栋  沈远超  杨金中  张启锐  李慎之 《地质与勘探》1999,35(2):3-5,24

乳山金矿赋存在中生代昆嵛山花岗岩中,矿脉（体）定位的构造为ＮＮＥ向断裂,该组断裂具多期活动特点,构造扩容带是矿体（富矿段）赋存的主要空间,通过地质,地球化学,γ能谱及矿体存规律等综合研究,预测隐伏矿体应定位于－２２２ｍ～－６００ｍ标高之间的构造扩容带中。  相似文献   

古尔班通古特沙漠生境对植物群落格局的影响   总被引：16，自引：0，他引：16  

钱亦兵  吴兆宁  张立运  师庆东  蒋进  唐立松 《地理学报》2004,59(6):895-902

沿87^o37'09"~88^o24'04"E纵穿古尔班通古特沙漠,对44^o14'04"~45^o41'52"N的范围进行11个样地的地貌景观调查、植被分布参数采集和土壤取样。研究区统计到的植物种数占古尔班通古特沙漠文献资料中植物种数的1/3,出现的植物群落构建了该沙漠大面积成片分布的荒漠植被景观。调查发现,随着宏观生境的空间变化,植物群落作相应的演替。在此基础上,利用因子分析 (PCA)和相关分析 (CA) 查明了沙漠风沙土理化属性,如土壤养分、盐分、水分、碱性 (pH) 等微生境的异质性仅对沙漠植被草本层片的多样性 (PIE草) 产生显著影响。同时,这些微生境因相互拮抗使沙漠环境处于暂时的脆弱平衡之中。  相似文献   

基于倒谱的2015年天津港“8·12”爆炸分析     

叶庆东  毛远凤  王生文  余大新  王岩 《震灾防御技术》2018,13(3):627-635

本文通过对记录到2015年天津港“8·12”爆炸的32个台站的三分量数字地震波形进行倒谱分析,得到了以下结论:①2个主要爆炸的发生时间间隔约为32.3s;②爆炸-2发生在爆炸-1的西北侧约353°处;③依据这些记录的倒谱,无法判定在爆炸-1前是否还存在微小的爆炸。以上结论均与前人研究成果吻合。由于倒谱叠加采用的是全波形,对滤波频带不敏感,因此,在检测发生在同一地点的多次爆炸或其它类似事件（如核爆）上有一定的优势。  相似文献   

艾比湖流域2008年丰水期水环境质量现状评价   总被引：8，自引：2，他引：6  

弥艳  常顺利  师庆东  高翔  黄聪 《湖泊科学》2009,21(6):891-894

在断面类别比例法的基础上采用内梅罗综合污染指数法分别评价新疆艾比湖流域2008年丰水期地表水和底泥的污染程度.评价结果显示:总氮、总磷、氨氮基本超标;其中博尔塔拉河污染物超标最严重,总磷超标14.1倍,总氮超标10.1倍.艾比湖流域水质及底泥实际监测类别中Ⅰ-Ⅲ类比例为30%.劣Ⅴ类比例为30%.因此,艾比湖流域丰水期水质中度污染.  相似文献