Environmental Isotopic Characterization of Groundwater and Surface Water in Northeast Missan Province,South Iraq     

Hussein Badr GHALIB  and Ali R?za S??üT 《《地质学报》英文版》2014,88(4):1227-1238

The present work studies the environmental isotopes assess groundwater characteristics of the different parts of the main aquifer in the northeast Missan Province in south of Iraq.Water samples of groundwater and surface water were collected for two dry and wet seasons during the water year of 2011–2012.The study shows that most of the groundwater in the aquifer falls above the global meteoric water line,and all the samples fall below the Mediterranean meteoric water line,indicating that these samples are a mixture of two water types.The tritium content of these samples supports this conclusion.The overall conclusion of this study indicates that there are two sources of groundwater recharge in the studied area:the ephemeral streams(Teeb and Dewerge) and major precipitation sources.According to the tritium levels at or below one tritium unit(TU) obtained from the water,supply wells are highly confined or "not vulnerable".Overall,the 3H results imply that recent recharge has taken place during the last four to five decades.In the recharge area,the high tritium content in the southern part of the Teeb area suggests that the recharge originates from rapid infiltration of surface runoff.Therefore,the groundwater resources in the study area should be protected from contamination,because it will influence the aquifer in a relatively short period of time if any contamination enters the recharge areas of the aquifer.  相似文献   

花岗岩暗色微粒包体特征及其研究方向   总被引：3，自引：0，他引：3       下载免费PDF全文

薛玉山  柳振江  王建平  成少博 《地质找矿论丛》2014,29(1):20-30

通过调研近年来国内外学者对于花岗岩类中暗色微粒包体的研究成果,总结了其野外地质、岩相学、地球化学和同位素等特征以及成因研究中的主要问题。暗色微粒包体(MME)广泛分布于I型花岗岩中,一般呈随机分布,形态多样,但以塑性特征为主;一般认为是岩浆混合成因,其原始物源是玄武质岩浆,具典型的火成岩结构,发育针状磷灰石、环带结构和筛状结构的斜长石;相对于寄主岩石,暗色微粒包体富Fe,Mg,贫Si,Na,其锆石U-Pb年龄在误差范围内与寄主岩石年龄一致等,反映了壳幔源岩浆的混合事件。暗色微粒包体与岩浆动力学行为、矿化关系及区域地质演化等方面值得进一步研究、探索。  相似文献   

A Forearc (Guleman, Elaziğ) Ophiolite: Evidence from Peridotite Mineral Geochemistry     

Mustafa Eren RIZELI  Melahat BEYARSLAN  A. Feyzi BING?L 《《地质学报》英文版》2017,91(Z1):31-31

The Guleman ophiolite,one of the most important ophiolitic massifs of the Southeast Anatolian Ophiolitic Belt,consists of a core of serpentinized mantle rocks overlain by an ultramafic sequence,layered and isotropic gabbro,and sheeted dykes.The ophiolite structurally overlies the Lower Miocene Lice Formation and is overlain by young sandstones and shales of the Upper Maashtrichtian-Lower Eocene Hazar Complex and Middle Eocene Maden Complex.The Guleman ophiolite tectonically overlain by Precambrian to Upper Triassic Bitlis metamorphic massif.The mantle peridotites compose mainly of fresh and in place serpentinized harzburgite tectonite with local bands and lenses of dunites with large-sized chromitite pods.The Guleman peridotites commonly show porphyroclastic texture,high-temperature fabrics such as kink-bands in olivines.According to microprobe analyses,the harzburgite and dunite have low Ca O and Al2O3 abundance similar to Mariana forearc,and their average Cr-(=Cr/(Cr+Al)atomic)ratio of Cr-spinelsis surprisingly high(0.63)besides Fo content of olivine is between 90.9 to 92.3 in peridotites.According to Mg#(Mg/(Mg+Fe2+))versus Cr#in spinel diagram,the degree of partial melting is higher than 35%and spinel values plot in the forearc peridotites field.The Gulemanharzburgites have low Ca O,Al2O3 and Ti O2 contents in orthopyroxene and clinopyroxene lammelles,resembling those of depleted harzburgites from modern forearcs and different from moderately depleted abyssal peridotites.Consequently,we propose that the Guleman peridotites form in a forearc setting during the subduction initiation that developed as a result of northward subduction of the southern branch of the Neo-Tethys in response to the convergence between Arabian and Anatolian plates.  相似文献   

塔里木盆地南缘绿洲荒漠化动态变化遥感研究——以策勒县为例   总被引：30，自引：1，他引：30  

丁建丽  塔西甫拉提·特依拜  熊黑钢  海米提·依米提 《遥感学报》2002,6(1):56-62

根据遥感调查结果，论述塔里木南部地区策勒县荒漠化动态变化的特征及分布规律。在揭示规律之前，利用地面控制点对1977年，1990年，1998年三个不同时期的多源卫星遥感数据（MSS，HRV，TM）进行精确配准，并对多源卫星遥感图像数据复合进行了研究。在野外调研的基础上应用PCI软件进行图像数据处理，编制了策勒地区不同年代的土地分类及土地类型动态变化图；通过不同时期遥感图像中荒漠化环境要素的对比分析，研究了策勒县周围地区近21年的荒漠化动态变化规律，从自然和人文因素两个方面分析探讨了荒漠化发展的趋势。  相似文献   

从严管控 多举措促节约——南宁市横县创建国土资源节约集约模范县略记     

黄尚宁  梁为提 《南方国土资源》2017,(11)

正距离广西首府南宁市约30千米的泉南高速公路旁,有一个面积约20平方千米的工业园区——六景工业园区,园内12栋高层标准厂房里,聚集了14家企业,有限的土地在这里发挥了可观的效益。这是南宁市横县节约集约用地的一个缩影。近年来,横县积极开展国土资源节约集约模范县创建工作,分别在提高建筑容积率、推进低效用地再开发、实施城乡建设用地增减挂钩试点等方面下功夫,拓展土地利用管理新途径。近10  相似文献   

新疆棉区划分与可持续性评价   总被引：6，自引：3，他引：3  

海热提·涂尔逊  倪天麒  韩德麟  曾静  雷军  艾力西尔 《干旱区地理》1999,22(1):53-61

本文根据新疆棉花生产现状,棉区划分的基本思路和依据,系统地研究了全疆棉区的区域性,流域性和适应性划分,从而地全疆棉区生产发展进行了可持续性评价,在“发展满意度”,“持续度”基础上,利用棉区发展的“优势度”“集聚度”“饱和度”四个概念,设计了评价模型及其相应指标体系,进一步将全疆６０个产棉市县,１００个产棉兵团农场分为可持续性,基本可持续性,初步可持续性和非可持续性四个类型。  相似文献   

东濮凹陷孟岗集洼陷深层勘探前景   总被引：1，自引：0，他引：1  

苏玉山  朱翠芹 《复式油气田》1999,(1):25-29

孟岗集洼陷目的层理深大,对其石油地质特征及勘探潜力的认识程度较低,是东濮凹陷勘探程度最低的地区,近两年,濮深８,濮深６两口深探井的实施,为客观地认识,评价洼陷深层资源提供了可靠的依据。文章从基本的石油地质特征分析入手,对阵岗集 勘探前主进行了评价,以期为探探部署提供决策依据,并以深层石油地质综合研究提供借鉴。  相似文献   

Significance and petrochemistry of upper mantle–mantle transition zone metaperidotites and oceanic crust metagabbros within the Kazdağı metaophiolite: implications for the geological evolution of the Izmir–Ankara–Erzincan Ocean, northwestern Turkey     

Ender SARIFAKIOGLU  Mustafa SEVIN  Yildirim DILEK  Andreas M?LLER 《《地质学报》英文版》2018,92(Z2):6-6

  相似文献   

峰林平原区岩溶塌陷特征与抽水诱发塌陷的预防——以广西来宾小平阳地区为例   总被引：1，自引：1，他引：0  

刘志云  林玉山 《中国岩溶》1996,15(3):269-277

广西来宾小平阳地区为一典型的亚热带峰林平原地貌区,其间粘性土、砂性土厚０～１０ｍ,岩溶发育。截至目前为止,区内因自然和人为因素而引起的塌陷有１９处,共５１个塌坑。除马槽山基岩自然塌陷为巨型塌陷外,其余均为土层塌陷且规模均较小,塌陷群的影响面积都不足１ｋｍ２。岩溶塌陷的平面形态一般受基岩开口溶洞（隙）形态的控制;剖面形态除受开口洞隙形态控制外,还受土层厚度及其岩性的影响。塌陷的时空分布特征与自然地质环境、水文气象和人为因素的影响及其变化有关。对于抽水诱发塌陷的预防,可通过井孔的合理布局和控制抽水降深等手段来实施   相似文献   

岩石在循环荷载作用下的强度及变形特征     

林卓英  吴玉山 《岩土力学》1987,8(3):31-37

本文着重研究了岩石在循环荷载作用下的强度及变形特征。实验结果表明,岩石在循环荷载作用下的强度低于其静力强度,而这个循环疲劳强度极限与振幅、频率有关;岩石在循环荷载作用下的变形特征类似于静力蠕变特征。  相似文献