山东半岛人口和产业布局适宜性评价     

赵振华 《地域研究与开发》2017,36(2)

选择环境敏感性、交通优势度、水土资源丰度、人口聚集程度及附属设施4个方面的12个指标构建评价要素体系,对山东半岛地区人口和产业布局适宜性进行分类评价,利用AHP求取各指标权重,借助GIS软件空间叠加功能,计算人口和产业布局适宜性大小,并将其分为5个等级。评价结果显示:人口布局适宜性以强区为主,主要分布在胶莱盆地及烟台东部地区;制造业布局适宜性强区主要分布在潍北地区、威海市中部地区、青岛市环胶州湾地区、日照市东港区;新兴产业布局适宜性强区主要分布在威海市北部地区、青岛市沿胶州湾地区,烟台市北部地区有零星分布;物流行业布局适宜性强区主要分布在烟台市北部沿海、环胶州湾地区及潍坊市市域范围内。  相似文献   

1999年和2000年夏季南极菲尔德斯半岛N_2O浓度对比          下载免费PDF全文

孙立广  朱仁斌  尹雪斌  赵俊琳  邢光熹  施书莲  杜丽娟 《极地研究》2001,(2)

1999与 2 0 0 0年夏季对南极菲尔德斯半岛不同地点大气中 N2 O浓度进行了监测 ,分析了苔藓植被区 N2 O浓度季节变化特征 ;2 0 0 0年夏季该植被区 N2 O浓度均值为 ( 31 0 .7± 4.4)×1 0 - 9(体积百分比 ) ,比 1 999年的 ( 32 1 .9± 3.3)× 1 0 - 9约低 1 1× 1 0 - 9;阿德雷岛企鹅滩及其沙坝处N2 O浓度变化趋势与苔藓植被区相一致 ,浓度均值分别为 ( 31 2 .4± 5 .1 )× 1 0 - 9和 ( 31 2 .7± 5 .3)× 1 0 - 9,比 1 999年约低 9× 1 0 - 9;另外 ,不同地点大气中 N2 O浓度普遍比 1 999年低 ,但整体变化规律相似 :各考察站区 N2 O浓度普遍高于无人区 ;唯一例外的是企鹅聚集区 N2 O浓度却高于各考察站区 ,暗示了企鹅及其排泄物、人为源是南极大气中 N2 O主要的源。本文初步探讨了 N2 O浓度异常降低的原因  相似文献   

雷西南地洼盆地构造沉降及其演化     

詹文欢  钟建强 《大地构造与成矿学》1992,16(4):337-342

本文通过对雷西南地洼盆地地层资料的分析.认为该区自第三纪以来的构造沉降达1223m.构造沉降过程可划分为7个时期.其中渐新世和中新世为快速构造沉降时期.该地洼盆地的演化经历了幼—少年期(E_1—E_2).青年期(E_3—N_1~1)。壮年期(N_1~2—N_2)和中—老年期(Q_1—Q_4)等四个阶段.前三个阶段以构造沉降为主,第四阶段则转变为构造抬升为主.第二和第三阶段均存在一个Mckenzic旋回.青年期阶段是该地洼盆地演化的最主要阶段,壮年期则是其定型阶段.  相似文献   

辽东半岛南部早白垩世变质核杂岩时空分布及动力学特征     

仲米山  张国仁  杨中柱  高福亮  吴子杰  潘玉啟  高永钊  王煊  王然 《地质与资源》1992,29(5):411-418

  相似文献   

西南极菲尔德斯半岛第三纪钙碱性火山岩的生成与演化     

郑祥身  刘小汉 《岩石学报》1991,7(2):28-37

西南极菲尔德斯半岛第三纪火山岩的岩石学和岩石化学特征表明,它们基本属于钙碱性火山岩系列,是岛弧火山作用的产物。该岩石组合中,随岩石中SiO_2含量的增加,斜长石斑晶数量减少,微量元素Cr、V丰度降低,Sr、Ba丰度下降,这些揭示了岩浆中斜长石和单斜辉石的分离结晶作用。稀土元素的系统变化也证明了这一点。主元素和微量元素的定量计算所验证了岩浆的分离结晶作用演化过程。  相似文献   

12 600 years of lake level changes, changing sills, ephemeral lakes and Niagara Gorge erosion in the Niagara Peninsula and Eastern Lake Erie basin   总被引：1，自引：0，他引：1  

James W. Pengelly  Keith J. Tinkler  William G. Parkins  Francine M. McCarthy 《Journal of Paleolimnology》1997,17(4):377-402

Over the last 12600 years, lake levels in the eastern Lake Erie basin have fluctuated dramatically, causing major changes in drainage patterns, flooding and draining ephemeral Lake Wainfleet several times and widening and narrowing the Niagara Gorge as the erosive effects of Niagara Falls waxed and waned. The control sill for Lake Erie levels was at first the Fort Erie/Buffalo sill, before the Lyell/Johnson sill in Niagara Falls took over due to isostatic rebound. This sill, in time, was eventually eroded by the recession of Niagara Falls and the Fort Erie/Buffalo sill regained control. The environmental picture is complicated by catastrophic outbursts from glacial Lake Agassiz and Lake Barlow-Ojibway, changes in outlet routes, isostatic rebound and climatic changes over the Great Lakes basins. Today, the flow of water into Lake Erie from the streams and rivers surrounding it only accounts for about 13% of the flow out of it, therefore, the importance of flow from the Upper Great Lakes, specifically the flow from Lake Huron, has a great effect on Lake Erie levels. While the changing control sills, Lyell/Johnson and Buffalo/Fort Erie would affect Lake Erie levels, overall they are mostly input driven by the amount of waters received from the Upper Great Lakes. Since Lake Erie's water level changes are so closely tied to Lake Huron's water level changes we have decided to use names assigned to Lake Huron such as the two Mattawa highstands and three Stanley lowstands rather than inflict a whole new set of names on the public. While the duration of each high and lowstand in Erie and Huron may not always be the same, they always happen within the same time frame. The datum elevations used for Lake Huron (175.8 m) and Lake Erie (173.3 m) are historically recorded averages. The Lake Erie levels proposed in this paper reflect Lake Hurons effects on Lake Erie and the levels occuring at the eastern end of the Erie Basin throughout the last 12600 years. All dates in this paper are uncorrected ¹⁴ C dates unless the date was obtained from shells, then the date has been corrected for hard-water effects. Also, all heights are given as modern day elevations and are not adjusted for isostatic rebound.  相似文献   

A review of the upper Campanian vertebrate site of Armuña (Segovia Province,Spain)     

《Cretaceous Research》2016

The Upper Cretaceous outcrops of Armuña (Segovia Province, Spain) yielded relatively abundant material of vertebrates during prospection and excavation in the second half of the 1980s. However, little has been published on these remains. A new analysis of the specimens from this upper Campanian site reveals the presence of some clades in the site for the first time (e.g., Dortokidae, Anguimorpha, Mosasauroidea). Furthermore, the material of the clades previously recognized there has been reviewed and described in more detail, with some previous systematic attributions confirmed and others refuted. Consequently, a relatively high local diversity has been identified. New taxa (i.e., a member of Anguimorpha and a eusuchian crocodyliform) are identified in Armuña, coexisting with other taxa previously described in other sites from the Iberoarmorican Realm. The vertebrates from Armuña confirm that the fauna from the Upper Cretaceous of the Iberian Peninsula is composed of a mixture of European endemic clades and lineages shared with other continents such as North America (e.g., anguimorphs) and Africa (e.g., bothremydids).  相似文献   

A Review of the Bentong-Raub Suture vis-à-vis New Insight of the Tectonic Evolution of Malay Peninsula,South East Asia     

Aftab Alam KHAN  Mustaffa Kamal SHUIB 《《地质学报》英文版》2016,90(5):1865-1886

Genesis of the so‐called Bentong‐Raub Suture of Malay Peninsula does not fit to the model of subduction‐related collision. It has evolved from transpression tectonics resulting closure and exhumation of the inland basin which underwent extensive back‐arc extension during Triassic. Crust having similar thickness (average ～35 km) below entire Malay Peninsula nagate collision of two separate continental blocks rather supports single continental block that collided with South China continental block during Permo‐Triassic. Westward subduction of intervening sea (Proto South China Sea) below Malay Peninsula resulted in widespread I‐ and S‐Type granitization and volcanism in the back‐arc basins during Triassic. Extensive occurrence of Permo‐Triassic Pahang volcanics of predominantly rhyolitic tuff suggest its derivation from back‐arc extension. Back‐arc extension, basin development and sedimentation of the central belt of the peninsula continued until Cretaceous. A‐Type granite of metaluminous to peraluminous character indicates their emplacement in an intraplate tectonic setting. Malay Peninsula suffered an anticlockwise rotation due to the rifting of Luconia–Dangerous Grounds from the east Asia in the Late Cretaceous–Early Tertiary. Extensive ductile and brittle deformation including crustal segmentation, pull‐apart fracturing and faulting occurred during the closure and exhumation of the basins developed in the peninsula during Late Cretaceous–Early Tertiary. Crustal shortening in the central belt of the peninsula has been accomodated through strike‐slip displacement, shearing and uplift.  相似文献   

近岸水质遥感评价参数的选择及评价模型的研究   总被引：1，自引：0，他引：1  

雷桂斌  张莹  潘德炉  王迪峰  付东洋 《海洋学报(英文版)》2016,35(1):114-117

利用遥感技术的水质评价是海洋环境监测的必然趋势,但目前可通过遥感技术反演的水质参数种类远少于《海水水质标准》中的35项,因此遥感监测时必须反演的水质参数有哪些?利用有限的参数该建立怎样的水质评价模型?成为我们关心的问题。本文以雷州半岛海域为研究对象,通过对实测数据的分析得出13种水质参数中的主导参数为总氮(N)、总磷(P)、化学需氧量(COD)、酸度(pH)、溶解氧(DO)这5种;再通过数理统计理论得出这5种参数对水质分类判别能力的大小关系为:COD> DO> P> N> pH,分别建立对应的五参数、四参数、三参数水质评价模型,并确定最优评价模型。即,雷州半岛海域水质遥感评价时必须反演的参数为COD、DO、P和N,水质综合评价模型为四参数模型,为后续其他海域水质的遥感监测提供可借鉴的方法。  相似文献   

胶东三山岛金矿床构造-热历史:~(40)Ar/~(39)Ar和裂变径迹年代学制约   总被引：3，自引：3，他引：0  

张良  李广伟  郑小礼  安平  陈兵宇 《岩石学报》2016,32(8):2465-2476

胶东金成矿省目前已探明黄金资源储量超过4000t,是世界上最大的花岗岩容矿的单金成矿省之一。三山岛金矿床位于该金成矿省西北部,是产于早白垩世郭家岭型花岗中的世界级金矿床。锆石U-Pb数据表明该矿床内赋矿围岩郭家岭花岗岩侵位于~128Ma,其后郭家岭花岗岩快速冷却并普遍经历了亚固态韧性变形。已有绢云母Rb-Sr数据表明,该矿床大规模金成矿作用和脆性变形发生于约117Ma。本次获取的1件~99Ma白云母~(40)Ar/~(39)Ar年龄揭示了主期成矿后一期微弱的构造-流体活动。4件锆石裂变径迹年龄中相对较老的单颗粒锆石年龄组分90±10Ma说明,该矿床大致于该时间段冷却至锆石裂变径迹封闭温度240±50℃。13件磷灰石裂变径迹年龄分布于69.8±7.2Ma~46.1±4.8Ma之间;8件磷灰石裂变径迹长度集中于13.1±0.2~12.3±0.2μm,并且呈单峰型略带负偏态的分布,说明该矿床大致于70~50Ma单调缓慢冷却通过磷灰石裂变径迹部分退火带125~60℃。最终,该矿床缓慢冷却剥露至现今近地表温度。相对缓慢的成矿后冷却和剥蚀以及新近深部钻探成果说明,三山岛及其周缘金矿床主断裂下盘脆性变形和热液蚀变作用叠加部位成矿潜力巨大,为有利的找矿靶区。  相似文献