济南东部岩溶水有机污染健康风险评价

近年来,济南岩溶水有机污染越来越突出,为了探究济南岩溶水有机污染对居民健康造成的影响,保障饮用水安全,该文在系统分析研究区水文地质条件的基础上,采用USEPA推荐的健康风险评价模型,根据实际采样测试数据,分析评价了济南东部3处岩溶水井点的有机污染对其范围内暴露人群造成的健康风险。结果表明:检出的主要有机污染物为三氯甲烷、四氯化碳、三氯乙烯、四氯乙烯。3个水井的有机污染非致癌风险未超过限值1,在可接受的范围内,四氯化碳的非致癌风险所占比例最大,为89.85%; 3个采样点有机污染致癌风险,超出了其可接受水平的最小限制10-6,但均未超出可接受的致癌风险的最大限制10-4,风险指数均在10-6~5.0×10-5之间,应该引起关注,产生致癌风险的主要污染物为三氯乙烯。有机污染非致癌风险和致癌风险的主要暴露途径为呼吸吸入,其次是饮水吸收,皮肤接触暴露途径风险值最小。     

草河群区域变质带及石榴石的研究

辽东草河群由北向南,可以分出比较完整的中压型巴罗式变质带、变质带的分界线或等变质度线和面基本上与地槽褶皱的构造方向一致,显示出带型区域变质作用和复合变质作用的特点。区域变质相带的矿物共生组合、斜长石号码、岩石类型、矿物的物理化学性质都具独自的特征。变质相带的变泥质岩石中的石榴石均属铁铝榴石,随变质度的增高,石榴石成分中的Al2O3、MgO、FeO Fe2O3含量增加,CaO、MnO含量降低。     

夹皮沟金矿田成矿模式

本文以岩性—构造—事件法论述了夹皮沟金矿田地质演化历史,并建立了夹皮沟金矿田成矿模式,对金矿田成矿理论和金矿预测提出了新的见解。研究认为,该矿田金的物质来源具多源性,金矿形成具多期多阶段性。区内北西向弧形韧性剪切带是金的主要控矿构造。总结出该矿田具有“一型三式”的特点,即花岗—绿岩型,包括板庙子式、大线沟式和三道岔式。     

浅谈区域地质及矿产调查中的（有关）物探工作

在区域地质调查和找矿工作中,运用地球物理信息解释地质体、线性构造、矿化体、矿体是行之有效的方法。解释的原则是遵循以地质为前提,以物性为基础,以各类地球物理资料为依据,点面结合的解释程序。笔者通过具体实例阐述了物探资料在地质填图和矿产调查中的应用效果,特别是运用综合信息提出的夹皮沟金矿田“一型三式”成矿模型的实例,对该地区地质找矿工作具有一定的实际意义 。     

吉林晚石炭世威宁期石头口门裂陷槽的发现及地质意义

吉林晚石炭世要期石头口门裂陷槽位于长春东５０ｋｍ。该裂陷槽以海底火山沉积－－硅质岩沉积为主。早期以含锰结核的碎屑岩和泥岩、硅质岩为主,并有少量的凝灰碉和玄武岩;中期以海底火山喷发的高钠质细碧岩、角地为主,并伴有规模不大的蛇纹岩;晚期以硅质岩、长石杂砂岩、泥岩、生物碎屑灰岩为主,在生物碎屑灰岩中首次发现Ｆｕｓｕｌｉｎａ ｌａｎｃｅｏｌａｔａ Ｆ．ｓｐ．、Ｐｓｅｕｄｏｓｔａｆｆｅｌｌａ ｋｈｏｔｕｎｅ     

Comparing data-driven landslide susceptibility models based on participatory landslide inventory mapping in Purwosari area,Yogyakarta, Java

There are different approaches and techniques for landslide susceptibility mapping. However, no agreement has been reached in both the procedure and the use of specific controlling factors employed in the landslide susceptibility mapping. Each model has its own assumption, and the result may differ from place to place. Different landslide controlling factors and the completeness of landslide inventory may also affect the different result. Incomplete landslide inventory may produce significance error in the interpretation of the relationship between landslide and controlling factor. Comparing landslide susceptibility models using complete inventory is essential in order to identify the most realistic landslide susceptibility approach applied typically in the tropical region Indonesia. Purwosari area, Java, which has total 182 landslides occurred from 1979 to 2011, was selected as study area to evaluate three data-driven landslide susceptibility models, i.e., weight of evidence, logistic regression, and artificial neural network. Landslide in the study area is usually affected by rainfall and anthropogenic activities. The landslide typology consists of shallow translational and rotational slide. The elevation, slope, aspect, plan curvature, profile curvature, stream power index, topographic wetness index, distance to river, land use, and distance to road were selected as landslide controlling factors for the analysis. Considering the accuracy and the precision evaluations, the weight of evidence represents considerably the most realistic prediction capacities (79%) when comparing with the logistic regression (72%) and artificial neural network (71%). The linear model shows more powerful result than the nonlinear models because it fits to the area where complete landslide inventory is available, the landscape is not varied, and the occurence of landslide is evenly distributed to the class of controlling factor.     

Numerical Simulation in Rockfall Analysis: A Close Comparison of 2-D and 3-D DDA

Accurate estimation of rockfall trajectory and motion behaviors is essential for rockfall risk assessment and the design and performance evaluation of preventive structures. Numerical simulation using discontinuous deformation analysis (DDA) is effective and helpful in rockfall analysis. Up to now, there have been many reports on application of two-dimensional (2-D) DDA programs. In this paper, the major advantages of rockfall analysis using 2-D and extensions to three-dimensional (3-D) analysis are presented. A practical 3-D DDA code is demonstrated to be capable of simulating free falling, rolling, sliding, and bouncing with high accuracy. Because rockfall trajectories and motion behaviors can be described as combinations of these four types, this demonstration indicates that the implemented code is capable of providing reliable rockfall analysis. Finally, specific tests are conducted to compare 2-D and 3-D DDA rockfall analysis in predicting trajectory and dynamic behavior. The results indicate that 3-D DDA simulations are more appropriate for rough tree-laden inclined slopes in providing detailed spatial distribution, whereas 2-D DDA simulations have better efficiency for slopes dominated by valleys and ravines. These results can help in selecting the appropriate DDA simulation for rockfall analysis.     

辽吉东部层状混合岩的成因

辽吉东部的层状混合岩与上、下围岩始终保持整合接触,反映它的体系基本上是封闭的,没有外来组份的加入。其组构、岩石化学、微量元素和稀土资料等表明层状混合岩不足岩浆型的,而是重熔岩浆型的,其原岩是沉积变质岩。     

济南岩溶水系统划分及典型泉域水力联系

济南地区岩溶地下水研究程度较高,但泉域边界争议较多,命名混乱。为统一思想认识,以地下水系统理论为指导,依据相关边界划分及定名原则,将济南单斜岩溶水系统划分了三级系统,明确了各级系统的边界范围。通过对主要构造水文地质特征分析,揭露了典型泉域之间的水力联系及补排关系。对济南岩溶地下水系统划分及相互关系的综合研究结果,可为济南保泉供水提供地质依据。