湘黔汞矿带相关成矿问题的讨论

湘黔汞矿带的含汞建造与生油层系的特征相似,汞矿床的形成和油气的聚集一样具有“生、储、盖”的成矿地质条件。中寒武统敖溪组及下寒武统清虚洞组既是汞矿的容矿层,也是汞矿的矿源层。汞的成矿流体是一种以地下水为主、包括油气在内的混合热液,成矿作用是在低温低压高盐度的还原环境中进行的,属于沉积成岩－地下水热液的成因类型。     

湖北京山地区寒武—奥陶系碳酸盐岩成岩作用及孔隙演化

本文通过对京山地区寒武—奥陶系碳酸盐岩成岩作用和孔隙演化的研究,认为本区寒武—奥陶系普遍经历了海底、大气淡水、埋藏及表生成岩环境,其间发生的成岩作用主要有胶结作用、白云岩化、压实-压溶、溶蚀和破裂作用。在这些成岩作用的改造下,岩石孔隙度从大于20％下降到1.5～5％,其中在中新生代孔隙相对较发育。     

A note on the algorithm of symplectic integrators

For a Hamiltonian that can be separated into N+1(N\geq 2) integrable parts, four algorithms can be built for a symplectic integrator. This research compares these algorithms for the first and second order integrators. We found that they have similar local truncation errors represented by error Hamiltonian but rather different numerical stability. When the computation of the main part of the Hamiltonian, H ₀, is not expensive, we recommend to use S ^* type algorithm, which cuts the calculation of the H ₀ system into several small time steps as Malhotra(1991) did. As to the order of the N+1 parts in one step calculation, we found that from the large to small would get a slower error accumulation. This revised version was published online in July 2006 with corrections to the Cover Date.     

利用高铁钾长石粉合成13X沸石分子筛的实验研究

对江苏丰县的富钾页岩进行预处理，得到钾长石含量达76．4％的钾长石粉，其Fe2O3含量高达7．52％。以此钾长石粉为原料经过焙烧处理、水热合成实验，在铁含量较高情况下成功合成了13X沸石分子筛，并采用正交实验法确定了优化工艺参数。对实验产物的主要性能测试表明，合成的富铁沸石产品与13X沸石分子筛工业产品相似，吸附量达到国家化学工业产品标准，可用于对含重金属离子废水的吸附处理。     

Detrital zircon provenance analysis in the Zagros Orogen,SW Iran: implications for the amalgamation history of the Neo-Tethys

International Journal of Earth Sciences - The Zagros Orogen developed as a result of Arabia–Eurasia collision. New in situ detrital zircon U–Pb and Hf isotopic analyses from a Cenozoic...     

论大气微量气体增加的环境效应及地质记录研究

大气CO2浓度增加对陆地化学侵蚀的影响小于酸雨的影响。水土流失可能促进大气CO2浓度的增高;植被破坏又影响大气CO2的固定。虽然大气CO2的较高浓度可能促成初级生产力的提高,但海洋光合作用速率增加于环境系统不利。尽管大气微量气体可能产生温室效应,但CO2与地表升温的对应关系不清楚、增温幅度与自然脉动的关系尚需客观评定。地质记录具全息性特征。加强地质记录和现代地质过程研究是揭示大气微量气体环境效应之谜的关键;从燃料和植被两个系列着手是维护全球环境的重要途径。     

Markov CA,Multi Regression,and Multiple Decision Making for Modeling Historical Changes in Kirkuk City,Iraq

The cellular automata (CA) model is an important tool in land use change studies. Swift increases in population and long-term expectations of rapid urbanization have led to extensive land use change, and normal living conditions have affected the natural resources of the land. This paper highlights and analyzes the historical urban changes in Kirkuk City, Iraq, considering repeated changes undergone by the state such change as government infrastructures, wars, and economic blockade. In this paper, an integrated model, built-in multi regression model, and multi-criteria evaluation were considered to improve the representation of CA transition rules. Environmental and socioeconomic factors were used to produce Suitable Maps (SMs). These SMs were practicalities to create factor layers and weight usage, rating method process for variance expert decision-making groups, and geographic information systems for the periods 1984, 1990, 2000, and 2010. The roots of the equation (R²) values are compared and these values are chosen to produce a good model of suitable maps. The approach used in this study provides a mechanism for monitoring suitability maps in Kirkuk. Furthermore, the model Markov CA is implemented and evaluated. The results indicate that the model, its related concepts performs sufficiency     

内蒙古东南部降水相态判据的对比分析

利用内蒙古东南部通辽、赤峰两站1992—2012年的地面和探空数据,针对两地雨、雨夹雪和雪等不同的降水相态进行对比分析,结果表明:通辽站降雨或雨夹雪时850hPa气温特征较为接近,赤峰站降雨夹雪或雪时850hPa气温特征较为接近;通辽站850~700hPa两层之间的厚度降雨夹雪或雪时特征相近,赤峰站降雨或雨夹雪时特征相近,在箱线图中两层之间的厚度与850hPa温度分别对3种相态出现完全相反的叠加。在850、925hPa气温的判别指标中,赤峰较通辽站:降雨时分别高1.5℃和1.7℃、降雪时分别高2.4℃和3.8℃。气温(T)统计表明:降雨时通辽站气温在4.0℃以上、赤峰站气温在6.0℃以上,降雪时两站均T≤0.0℃,两站气温在0.0℃T≤4.0℃(通辽站,赤峰站为6.0℃)为雨、雨夹雪和雪共同出现的温度区间。虽然两站阈值大小有较大差异,但3种降水相态的出现均与中、低层厚度和低层气温密切相关,与中层的气温关系甚小,说明该地区中、低层厚度和低层气温高低决定地面降水相态。     

WATER QUALITY STUDIES IN MALAYSIAN DISUSED MAN MADE LAKFS FOR SUITABILITY OF AN AQUACULTURE PROJECT

A study has been conducted on the status of water quality in two disused man made lakes, which have potential for cage aquaculture project. This study highlights the quality of water analyzed with reference to various physical - chemical parameters in two selected lakes and their suitability for fish farming. A number of parameters were measured including the amount of NH3 - N, NO3 - N, NO2 - N and total phosphorus while in - situ measurement including DO, pH, temperature, conductivity, TDS and Secchi disk visibility. Beside the physical -chemical of water, the location, morphometry and climate conditions were also investigated. The chemical data analyzed for six months indicated that Lake A and Lake B are characterized by relatively high DO, slightly neutral pH and low TSS. The concentration of NH3 -N and NO2 -N was very low （0. 058 mg/L and 0. 04 mg/L, respectively） and total phosphorus was usually in low concentration and sometimes would seem negligible. Besides, NO3 - N occurred in slightly higher concentration （1.75 mg/L）. Results obtained indicated that the study site has high potentiality for development of inland fisheries practices.     

武汉绕城公路东北段主要工程地质问题研究

为了给项目的设计和施工提供科学依据，对武汉绕城公路东北段软土、膨胀土、砂土地震液化、岩溶、深路堑、高填路基、筑路材料等潜在的地质灾害进行了详细评价，通过采用工程地质测绘及钻探、触探、物探、试验分析等多种勘探、测试手段，对沿线的各种工程地及其危害表现形式进行计算分析，预测施工过程及工程建成后可能出现的岩土工程问题，提出了相应的施工方法，对同类工程的建设具有指导意义。