Effects of the pharmaceutical fluoxetine in spiked-sediments on feeding activity and growth of the polychaete Capitella teleta     

《Marine environmental research》2013

The marine–estuarine polychaete Capitella is an indicator of organic pollution and plays important roles in sewage waste cycling. The antidepressant fluoxetine can be accumulated in streams and sewage effluents and it could pose a hazard to infauna. Effects of fluoxetine on feeding and growth of Capitella teleta were investigated through the exposure to 0, 0.001, 0.03, 0.3 and 3.3 μg/g dry weight sediment-spiked fluoxetine during 18 days. No effects of fluoxetine concentrations were observed on egestion rates, body weight and size-specific egestion rates. Fluoxetine favoured the occurrence of males with abnormal genital spines. This suggests that fluoxetine can have important reproductive implications. Further studies are recommended to assess potential detrimental effects on benthic infauna inhabiting close to sewage treatment plants.  相似文献   

鲁西北西向断裂系与沂沭断裂带晚中生代演化关系及其动力学背景探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

王先美  钟大赉  李理  丁增勇  李松  张荣强 《地学前缘》2010,17(3):166

晚中生代是华北地块构造演化的转折时期。由出露于沂沭断裂带、鲁西地体、鲁东地体的中生代地层、岩浆,结合断裂活动年代学、区域地质等资料分析,可以将沂沭断裂带晚中生代构造演化划分出距今约160Ma、130～110Ma、90～80Ma等3个关键时期,并分别与左行压剪、左行张剪、右行压剪构造活动相对应。晚中生代沂沭断裂带与鲁西北西向断裂系间的几何学、运动学、年代学的共轭匹配关系表明,它们为特定构造动力学背景下形成的一组共轭断裂系。同时对鲁东地体晚中生代构造演化、鲁东北西向断裂系特征,以及沂沭断裂带、北西向断裂系晚中生代构造演化的动力学背景进行探讨。  相似文献   

川滇西部上新世以来构造地貌:断裂控制的盆地发育及对于远程陆内构造过程的约束   总被引：4，自引：0，他引：4  

唐渊  刘俊来 《岩石学报》2010,26(6):1925-1937

青藏高原隆升、周边地貌形成是新生代时期印度-欧亚板块碰撞后的重要响应。在滇西北地区发育了一系列由晚新生代(上新世以来)活动断裂所控制的盆地,例如宾川盆地、洱海盆地、鹤庆盆地、弥渡盆地等。宾川盆地是近南北向程海左行走滑断裂在走滑剪切作用下产生的北西向正断层和北东向走滑断层共同作用而形成的一个较大的拉分盆地。洱海盆地是由两组陡立的共轭张剪性(Transtensional)断层组限定的,为一伸展断陷盆地,总体上反映了近E-W向的区域伸展。滇西北地区发育的其它晚新生代盆地,如弥渡盆地、鹤庆盆地、剑川盆地等,也为区域走滑断裂及其分支断裂所控制,并且这些分支断裂在区域上为一组NE-SW和NW-SE向的共轭正断裂,反映了该区域近E-W向的伸展。将藏东南三江地区发育的活动断裂按照其走向分为三组:(1)NW-SE走向的断裂,如红河断裂、无量山-营盘山断裂等;(2)近N-S向断裂系,以程海断裂、小江断裂等为代表;(3)NE-SW走向的断裂,如丽江-剑川断裂、鹤庆-洱源断裂和南定河断裂等。这些断裂的震源机制解表明地震断裂活动性或者是走滑性质或者是伸展属性,它们的组合型式也揭示出藏东南三江地区在上新世以来表现为近E-W向的伸展。区域上,在藏东北部地区发育的断层构造组合普遍反映了以近E-W向挤压为主导的应力场。推测这一现象为上新世以来藏东地区上地壳围绕喜马拉雅东构造结做顺时针旋转所致,区域上受印度-欧亚会聚过程中印度板块顺时针旋转诱发的差异性应力场制约。  相似文献   

Socio-economic drivers of deforestation in Roghani Valley,Hindu-Raj Mountains,Northern Pakistan   总被引：1，自引：1，他引：0  

Fazlur RAHMAN  Fazlul HAQ  Iffat TABASSUM  Ihsan ULLAH 《山地科学学报》2014,11(1):167-179

Deforestation and associated ecological disturbances are the issues of global concern.Researchers have investigated a number of driving forces which accelerate the rate of deforestation at local and regional levels.These include poverty,population growth,market demand and prices,political instability,agricultural expansion and changes in property right and ownership regimes.This paper seeks to explore the impacts of population growth,changing tenure system and other socioeconomic factors on the forest cover of Roghani Valley,located in Hindu Raj Mountains,Northern Pakistan.The present study is mainly based on information collected through participatory observation,selfadministered interviews and questionnaire survey.Geographical Information System（GIS） database is also used for mapping and quantification.The results reveal that in the past three to four decades the study area has been subjected to severe deforestation and about half of the forest area has been converted into barren land.Thus,the area under natural forests decreased from 2099 to 1444 hectares in four decades.This large-scale deforestation is attributed to both proximate and under lying causes particularly traditional land tenure system and demographic development.Consequently,forest resources have been degraded and a number of plant species have disappeared from the forests of the study area while several others are in the process of disappearance.  相似文献   

山东福吉山铜矿构造控矿因素分析          下载免费PDF全文

吴立新  刘俊玉  肖翔 《山东国土资源》2014,30(7)

福吉山铜矿成矿地质特点不同于山东已有的铜矿类型,属于构造热液成因类型。近SN向的平移断裂同时具有张扭性和压扭性双重力学性质,其中张扭性破碎带造就成矿空间,造成了矿体近等间距雁列式排列。受断裂构造的影响,矿区内节理、裂隙发育,为成矿热液的运移和积聚提供了良好的空间。区内沿裂隙充填形成的石英脉、褐铁矿脉、铜矿脉发育。  相似文献   

低序级断层成像技术在c13地区的应用     

许建国 《海洋地质前沿》2014,(2):56-62

低序级断层在地震剖面上,通常表现为具有微小错动,同相轴扭曲,或者振幅变弱,延伸短、断距小、识别难,描述难等特征。在对采集处理过程中影响低序级断层识别的观测系统面元网格、信噪比、频率、速度误差等因素详细分析的基础上,通过建立全波场正演地质模型,借助方查体属性技术以及井资料,研究了针对性的处理技术。同时利用相干体属性、曲率属性沿层切片、方差体等技术进行有效识别低级序断层,取得了较好的效果。  相似文献   

大洋核杂岩与拆离断层研究进展   总被引：1，自引：0，他引：1       下载免费PDF全文

于志腾  李家彪  丁巍伟  张洁  梁裕扬  朱磊 《海洋科学进展》2014,32(3)

大洋核杂岩和拆离断层是洋中脊中发育的重要构造,被广泛关注。拆离断层一般为长期活动的,低角度的,大断距的正断层,绝大多数形成于慢速和超慢速扩张洋中脊的内侧角上,其将地壳深部和上地幔的物质拆离到海底面形成大洋核杂岩。大洋核杂岩因其表面发育了窗棱构造,在多波束图像上更容易识别。大洋核杂岩所处的地壳年龄较年轻,为0~10Ma。洋中脊半扩张速率约为10mm/a,具有不对称扩张的特点,有拆离断层的一侧扩张速率更快。在大洋核杂岩取得的岩芯中代表性岩石为辉长岩,地震资料解释认为大洋核杂岩下具有一个大的辉长岩侵入体。发育大洋核杂岩和拆离断层的区域有升高的布格重力异常,高的P波速度和抬升的莫霍面。拆离断层起源于岩浆供给不足的区域,大多在大洋中脊洋脊段(segment)的末端,其演化会受到上地幔辉长岩体侵入的影响,通过旋转铰链的模式进行。总结了全球大洋核杂岩和拆离断层的分布情况,讨论了其岩石特征、地球物理场特征,探讨其成因机制和演化模式,并探讨了未来的研究方向。  相似文献   

高密度电法在探测隐伏断裂带中的应用   总被引：1，自引：0，他引：1  

池跃龙  ;张亭  ;王星捷 《城市地质》2014,(3):44-46

本文介绍了高密度电法的原理及工作方法,并应用高密度电法对龙门山断裂区的隐伏断裂带进行了勘测。实验结果表明了高密度电法,是探测隐伏断裂带的行之有效的方法。  相似文献   

Influence of carbonate facies on fault zone architecture     

《Journal of Structural Geology》2014

Normal faults on Malta were studied to analyse fault propagation and evolution in different carbonate facies. Deformation of carbonate facies is controlled by strength, particle size and pore structure. Different deformation styles influence the damage characteristics surrounding faults, and therefore the fault zone architecture. The carbonates were divided into grain- and micrite-dominated carbonate lithofacies. Stronger grain-dominated carbonates show localised deformation, whereas weaker micrite-dominated carbonates show distributed deformation. The weaker micrite-dominated carbonates overlie stronger grain-dominated carbonates, creating a mechanical stratigraphy. A different architecture of damage, the ‘Fracture Splay Zone’ (FSZ), is produced within micrite-dominated carbonates due to this mechanical stratigraphy. Strain accumulates at the point of juxtaposition between the stronger grain-dominated carbonates in the footwall block and the weaker micrite-dominated carbonates in the hanging wall block. New slip surfaces nucleate and grow from these points, developing an asymmetric fault damage zone segment. The development of more slip surfaces within a single fault zone forms a zone of intense deformation, bound between two slip surfaces within the micrite-dominated carbonate lithofacies (i.e., the FSZ). Rather than localisation onto a single slip surface, allowing formation of a continuous fault core, the deformation will be dispersed along several slip surfaces. The dispersed deformation can create a highly permeable zone, rather than a baffle/seal, in the micrite-dominated carbonate lithofacies. The formation of a Fracture Splay Zone will therefore affect the sealing potential of the fault zone. The FSZ, by contrast, is not observed in the majority of the grain-dominated carbonates.  相似文献   

Understanding the Mesozoic kinematic evolution in the Cameros basin (Iberian Range,NE Spain) from magnetic subfabrics and mesostructures     

《Journal of Structural Geology》2014

Analysis of anisotropy of magnetic susceptibility (AMS) and brittle mesostructures (hydroplastic synsedimentary faults and tension gashes) is applied in this study in order to characterize the Mesozoic tectonic events in the Cameros basin (NW Iberian Range), formed between Tithonian and Albian times. Low-field AMS at room and low temperature (LF-AMS at RT and LF-AMS at LT, respectively) together with high-field AMS (HF-AMS) measurements allow separating ferro- and paramagnetic fabrics. The combination of LF-AMS at LT and HF-AMS torque measurements confirms the reliability of both procedures in terms of isolating the paramagnetic contribution to the AMS. Magnetic fabric results combined with the analyses of synsedimentary faults indicate a NW–SE extension direction during Aptian (and probably Barremian) times. This extension direction is perpendicular to the main extension direction (NE–SW) prevailing during early and late stages of basin evolution. It is also consistent with extension direction deduced from large-scale bending folds and tension gashes, developed after partial lithification. Cleavage development during Albian enhanced the orientation of the magnetic fabric in lithologies where the previous extensional magnetic lineation is coaxial with the expected one for compression.  相似文献