保护行动计划软件在湿地自然保护区功能区划分中的应用概述   总被引：2，自引：0，他引：2  

唐博雅  刘晓东 《湿地科学与管理》2011,7(1):44-47

在探讨湿地类型自然保护区功能区划分的意义及存在问题的基础上,将保护计划实施工具——CAP软件(Excel Workbook和Miradi)运用到湿地类型自然保护区功能区划分中,并对CAP软件的原理、功能及实用性进行探讨分析。分析研究表明,CAP软件对于湿地类型自然保护区功能区划分、动态分区具有可行性、适用性及科学性。  相似文献   

鄂东南铜绿山矿床石榴子石显微结构及微区成分对成矿过程的指示     

纪敏  赵新福  曾丽平  范田纬腾 《岩石学报》2018,34(9):2716-2732

鄂东南矿集区铜绿山矿床是典型的矽卡岩型铜铁多金属矿床,矿体产出在铜绿山岩体与三叠系碳酸盐地层的接触带。尽管本矿床的研究程度很高,但对早期成矿流体的成分与演化及矿质富集沉淀等过程的精细制约依然比较欠缺。石榴子石在铜绿山矿床中分布广泛,本文对不同产状的石榴子石利用SEM显微结构、EPMA主量元素和LA-ICPMS微量元素分析,去探讨石榴子石的生长动力学及其对成矿过程的指示。大理岩和镁质外矽卡岩中的石榴子石均以钙铝榴石为主,端元成分比较均一,∑REE含量低(3. 01×10~(-6)～14. 34×10~(-6)),具有弱的Eu异常、轻微富集LREE的模式。钙质外矽卡岩和内矽卡岩中的石榴子石以钙铁榴石为主,端元成分变化较大,单颗粒从核部到边部Fe含量具有增加的趋势,其∑REE含量较高(22. 71×10~(-6)～806. 8×10~(-6)),具有明显的正Eu异常、极度富集LREE亏损HREE的模式。大理岩中的钙铝榴石环带不发育,表明在晶体生长过程中,界面反应速率很慢且物质迁移以扩散为主;而镁质外矽卡岩中的钙铝榴石可见振荡环带,表明界面反应速率比以扩散为主要方式的物质迁移快,这与白云石相对于方解石具有较低的反应吉布斯自由能,因此较难被热液消耗有关;钙质外矽卡岩中的钙铁榴石振荡环带清晰,该类石榴子石只有在界面反应速率较快且物质迁移方式以对流为主的情况下才能形成;内矽卡岩中的钙铁榴石的环带杂乱,尽管其形成的动力学模式与钙质外矽卡岩中的类似,但由于其距离岩体更近,热量迁移困难,在结晶生长受阻的同时由于对流提供的充足物质使得原先的环带发生溶解再沉淀进而形成结构混乱的再吸收环带。上述生长动力学模式也能够很好的对应Nb、Ta含量的脱耦和轻重稀土分异的特征。铜绿山不同产状的石榴子石中,外矽卡岩带中钙铁榴石Eu含量最高,而Eu~(2+)与成矿金属元素一样可被Cl-络合的,其含量的高低可能指示了对应的成矿元素在成矿热液中的浓度。石榴子石环带自核部向边部Fe含量具有逐渐增加的趋势,反应干矽卡岩阶段从早到晚,热液中的金属成矿元素含量增加。  相似文献   

北京市地面沉降控沉目标分析     

郭萌  田芳  王荣  姜媛  贾三满 《城市地质》2013,(3):1-5

《全国地面沉降防治规划(2011-2020年)》明确提出了北京市的控沉目标。本文介绍了控沉指标的计算方法,对如何界定区域地面沉降速率的计算范围进行了探讨,提出了基于控沉目标的地面沉降分区标准,最后提出了用好南水北调来水等地面沉降的防控措施,以为北京市切实有效进行地面沉降防治工作提供参考。  相似文献   

普洱地区中二叠统茅口阶地层及类分带     

周铁明 《云南地质》2001,(3)

云南普洱中二叠统茅口阶地层处于古特提斯海云南 老挝海槽 ,沉积物为大套碳酸盐岩夹泥质岩。类化石十分丰富 ,依据垂直分布特征 ,由下而上建立Parafusulinanosonensis带及Neoschwagerinacriticulifera N .douvillei带 ,同时介绍了二化石带中类动物群特征 ,为与邻区中二叠统茅口阶地层的划分和对比提供了新的依据。  相似文献   

“北祁连蛇绿岩及其构造背景野外研讨会”在甘肃举行     

张旗 《岩石学报》1997,13(4):528-528

别鲁阿嘎希花岗闪长岩－石英闪长岩带与金矿化有十分密切的关系。锆石Ｕ－Ｐｂ法测得别鲁阿嘎希石英闪长岩年龄为３６９Ｍａ。斜长石环带成分振荡，与黑云母共生的角闪石成分显示为富镁。岩石地球化学特征表明，这些岩石为幔源的拉斑玄武岩岩浆和地壳部分熔融形成岩浆混合后的产物。  相似文献   

Applicability of landslide susceptibility and hazard zoning at different scales   总被引：6，自引：0，他引：6  

Leonardo Cascini   《Engineering Geology》2008,102(3-4):164

Landslide susceptibility and hazard zoning can notably improve land-use planning, and thus can be considered an efficient way to reduce future damage and loss of lives caused by landslides. However, the lack of standard procedures restricts the use of susceptibility and hazard-zoning maps, notwithstanding their extensive development over the last decades.JTC-1, the Joint Technical Committee on Landslides and Engineered Slopes, fills this void by proposing International Guidelines for Landslide Susceptibility, Hazard and Risk Zoning for land-use planning, which provide definitions, terminology and international standards for methods, levels, scales and types of zoning. The Guidelines also promote the use of quantitative risk-management principles, essential to compare risk from landslides with risks related to other hazards and with loss of life tolerance criteria.This paper focuses on the applicability of landslide susceptibility and hazard zoning at different scales. Several zoning examples, referring to active, dormant and occasionally reactivated slides, provide insights into and highlight the relationships among different methods, levels and types of zoning. The examples also stress the importance of a correct characterization of the processes leading to landsliding to produce reliable susceptibility and hazard-zoning maps.  相似文献   

Zoning for flowslide and debris flow in pyroclastic soils of Campania Region based on “infinite slope” analysis     

L. Picarelli  L. Olivares  B. Avolio 《Engineering Geology》2008,102(3-4):132

Campania Region (Italy), one of the most densely populated areas in Europe, is probably the one with the highest risk of landslide. A large part of the region is covered by unsaturated cohesionless pyroclastic deposits subjected to rainfall-induced landslides. According to experience, these can display different features and magnitude. The most catastrophic landslides are liquefied debris flows which periodically occur on steep slopes, causing death and destruction in areas located downslope. Therefore, zoning of those areas which can be the source of liquefied debris flow is necessary. The paper reports some useful elements for zoning based on infinite slope analysis, accounting for the results of recent research on the mechanics of rainfall-induced landslides in pyroclastic soils.  相似文献   

试论钾、钠、锂碱性元素在金银矿化异常评价及隐伏矿预测方面的应用──以山门银矿为例     

康太翰  于洪顺 《吉林地质》1995,(4)

本文以山门银矿床为例，研究和分析了碱性元素在矿化带三度空间上的含量变化和金银各侵蚀截面上异常变化特征。并建立碱性元素在金银矿床交代岩垂直分带综合模式。在此基础上进行了外围深部隐伏矿预测。  相似文献   

常宁县黄沙窿铜矿区原生晕特征     

罗长清 《湖南地质》1992,11(3):183-189

黄沙窿铜矿区热液矿床原生晕,严格受南北向与近东西向两组构造控制.与赤铁矿化、白云石化等围岩蚀变有密切关系。区内矿化蚀变与原生晕组分,有明显的垂直分带特征。其中Ⅱ矿带元素分带序列从上至下为Sb—As—Ag—Pb—Cu—Bi—Zn—(As)—Sn。据此可作为前缘与尾缘异常的评价依据。当地表矿体引起的原生异常中,包含明显的Sb、Ag异常,且Sb/Sn>0.3;蚀变以白云石化、赤铁矿化为主,矿石矿物主要为辉铜矿时,说明该矿体向深部尚有较大的延深,延深距离可用文中提到的线性方程来判断。笔者根据前缘异常评价指标,推测ZK_(13)与ZK_(24)间有盲矿存在。  相似文献   

Spatial relationships of salt distribution and related physical changes of underlying rocks on naturally weathered sandstone exposures (Bohemian Switzerland National Park,Czech Republic)   总被引：2，自引：0，他引：2  

R. Přikryl  L. Melounová  Z. Vařilová  Z. Weishauptová 《Environmental Geology》2007,52(2):409-420

Efflorescence, case hardening, and granular disintegration represent common weathering features of Upper Cretaceous quartz sandstones exposed in the Bohemian Switzerland National Park (NW Bohemia, Czech Republic). Salt species (sulphates: gypsum (CaSO₄·2H₂O), potassium alum (KAl(SO₄)₂·12H₂O), tschermigite (NH₄Al(SO₄)₂·12H₂O), alunite (K(Al₃(SO₄)₂(OH)₆), and alunogen (Al₂(SO₄)₃·17H₂O), minor nitrates: nitrammite (NH₄NO₃)) determined by X-ray diffraction exhibit vertical and geographic zoning. More soluble salts (chlorides, nitrates, tschermigite) crystallize preferentially on the cliffs exposed to the south, whereas the north face is characterized by the presence of less soluble phases: gypsum and K(Al₃(SO₄)₂(OH)₆. Vertical zoning of salt distribution on natural outcrops differs from the salt distribution in masonry. Salt distribution near the base of the cliff (profile to about 2–2.5 m above the ground) is affected by capillary rise from the ground level (first maximum of water-soluble salts at the level of 1–1.5 m above the ground) and by percolation of precipitation through the overhanging rock sequence (second maximum of 2–2.5 m above the ground). Percolation of salt solution from higher parts is affected by the asperity of the rock surface. The concentration of salts (determined by ion exchange chromatography) correlates to the changes of physical properties: bulk porosity, microporosity and water absorption. The porosity, microporosity, moisture content and absorption generally increase with the increasing volume of sulphates and nitrates.  相似文献