新疆塔什库尔干杏子沟铁矿区元素地球化学特征研究   总被引：1，自引：0，他引：1  

周兵  刘兵  程铂林  杨利锋  廖黎明 《四川地质学报》2010,30(3):342-346

塔什库尔干杏子沟铁矿位于华南成矿区木吉-阿克赛钦Cu、Au（Fe）成矿带。研究从矿区元素背景特征、共生组合关系、空间分布、在各地质单元中的分布、时间演化规律、元素分布与地层、岩浆岩以及构造的关系等六个方面论述了铁矿区的元素地球化学特征,对寻找铁金钼多金属矿种具有重要的指示意义。  相似文献   

莲花山断裂带东南段碧甲地区地震地质特征     

黄河生  魏柏林  陈庞龙  徐辉龙 《华南地震》1993,(4)

在对拟建的惠州钢铁厂址及平海、碧甲地区进行地震地质调查的基础上,论述了莲花山断裂带东南段在稔平半岛的展布方向、发育和组合规律以及(车免)近期以来的活动性,进而对该地区的地震危险性作出评估。  相似文献   

EPA Develops Ground Water Protection Approach     

Bob Barles  Steve Ainsworth 《Ground Water Monitoring & Remediation》1993,13(1):98-100

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Australian conservation organisations' perspectives on tourism in national parks: a critique     

Bob McKercher 《GeoJournal》1993,29(3):307-313

Australia's conservation and parks organisations have become actively involved in the debate over tourism use of national parks and their associated wilderness areas. To date, at least seven organisations have produced at least ten formal policy statements and submissions. This paper presents an analysis of these policy statements.The policies reviewed use a narrow definition of tourism, based on the presence or absence of commercial, private sector activity. If commercial activity exists, then tourism exists; if not, then it is considered to be recreation. This distinction reflects the widely held opinion among many environmentalists that non-commercial use of national parks is acceptable, but that commercial use is essentially unacceptable, even though the groups may be participating in the same activity. The author argues that while making a number of valuable suggestions, these policies suffer from major conceptual flaws that minimise their contribution to the debate on acceptable human uses of parks.The author concludes by making a number of recommendations to rectify the conceptual flaws inherent in the policies.  相似文献   

豫陕中-晚元古代沉积盆地(一)   总被引：24，自引：2，他引：24       下载免费PDF全文

孙枢  从柏林  李继亮 《地质科学》1981,(4):314-322

河南西部和陕西东部的秦岭以北地区,以及山西南部中条山地区,广泛分布的中、上元古界未变质地层,近年来受到越来越多的重视。由于剖面完整,厚度巨大,沉积建造又别具一格,因而多将本区视为华北断块上一个独立的地层和沉积分区。本文着重讨论该盆地类型及其与东秦岭拉张运动的关系<^[1,2]。  相似文献   

冀东迁西-迁安地区早太古代变质岩系原岩恢复及其地质意义          下载免费PDF全文

从柏林  李继亮  张儒瑗 《地质科学》1982,(2):125-133

冀东早太古代变质岩系的主体是一套呈层分布的,各种成分麻粒岩及其某些退变质产物——斜长角闪岩类。在其上部发育变质含铁建造,而在其下部常夹有变质的镁铁质和超镁铁质岩(如变闪辉岩、变辉石岩和蛇纹石化橄榄岩等)薄层或透镜体。 麻粒岩的矿物组合是斜方辉石+单斜辉石+斜长石(常常为反条纹长石)+石英+磁铁矿±角闪石±黑云母。在变质含铁建造中局部出现包括铝硅酸盐的矿物组合(蓝晶石-石榴石-黑云母-斜长石-石英)。变质铁硅质岩可以分为两类:辉石磁铁石英岩和英榴易熔岩(张儒瑗,从柏林,1981)。  相似文献   

Use of Systematic, Palaeoflood and Historical Data for the Improvement of Flood Risk Estimation. Review of Scientific Methods   总被引：2，自引：0，他引：2  

Gerardo Benito  Michel Lang  Mariano Barriendos  M. Carmen Llasat  Felix Francés  Taha Ouarda  Varyl Thorndycraft  Yehouda Enzel  Andras Bardossy  Denis Coeur  Bernard Bobée 《Natural Hazards》2004,31(3):623-643

The catastrophic floods recently occurring in Europe warn of the critical need forhydrologic data on floods over long-time scales. Palaeoflood techniques provideinformation on hydrologic variability and extreme floods over long-time intervals(100 to 10,000 yr) and may be used in combination with historical flood data (last1,000 yr) and the gauge record (last 30–50 yr). In this paper, advantages anduncertainties related to the reconstruction of palaeofloods in different geomorphologicalsettings and historical floods using different documentary sources are described.Systematic and non-systematic data can be combined in the flood frequency analysisusing different methods for the adjustment of distribution functions. Technical toolsintegrating multidisciplinary approaches (geologic, historical, hydraulic and statistical)on extreme flood risk assessment are discussed. A discussion on the potential theoreticalbases for solving the problem of dealing with non-systematic and non-stationary data ispresented. This methodology is being developed using new methodological approachesapplied to European countries as a part of a European Commission funded project (SPHERE).  相似文献   

Sounding the dark cosmos     

Bruce A Bassett  Bob Nichol  Daniel J Eisenstein 《Astronomy& Geophysics》2005,46(5):5.26-5.29

Bruce Bassett, Bob Nichol and Daniel J Eisenstein explain why the Wide-Field Multi-Object Spectrograph will need to look so far into the universe, over such a wide area, in order to map sound waves from the dawn of time.  相似文献   

大别山超高压变质带的大地构造框架   总被引：57，自引：17，他引：40  

王清晨  从柏林 《岩石学报》1998,14(4):481-492

依据岩石学、地球化学、同位素年代学的新资料,对大别山造山带研究中诸如蛇绿混杂岩、碰撞时代、超高压变质岩与围岩的关系、俯冲极性等问题进行了论证,指出大别山超高压变质带是中朝陆块与扬子陆块间碰撞造山的产物。在三叠纪发生的陆－陆碰撞中,扬子陆块向北俯冲至华北陆块之下,但至今尚无发现残存的蛇绿混杂岩,碰撞时缝合带的位置被已经折返出露地表的南大别碰撞杂岩带所取代。  相似文献   

微波波段大气的衰减作用之实验研究   总被引：1，自引：0，他引：1  

赵柏林  朱元竞  韩庆源 《气象学报》1987,45(1):48-55

本文研究了微波波段(λ=5mm-3.2cm)大气的衰减作用。用微波辐射计,根据太阳射电法和大气辐射法进行大气微波吸收值的测量,同时用探空记录计算大气微波吸收值,两者进行比较和分析它们的相关。本文研究了大气微波吸收值与大气总水汽含量或地面气象要素(如温度、比湿)之间的关系,提供预告大气微波吸收值的可能性,云层对于大气吸收值的影响,文中也作了讨论。  相似文献