Electron microprobe study of detrital amphiboles from Famennian synorogenic clastic sediments of the Saxothuringian belt (Erbendorf Paleozoic,NE-Bavaria,Germany): Consequences for provenance and geotectonic development     

Jürgen Schäfer 《Geodinamica Acta》2013,26(4):125-136

Abstract

Detrital amphiboles from the Famennian, Saxothuringian greywackes of the “Erbendorf Paleozoic” in Bavaria were analysed with an electron microprobe. The results were compared with recalculated literature data of amphiboles from potential source rocks to obtain more detailed information about the provenance of the oldest preserved synorogenic sediments in the Saxothuringian belt.

All of the detrital amphiboles show very similar, homogeneous chemical compositions. All of them are Ca-amphiboles (with (Ca+Na)_B ≥: 1.34; Naf_B < 0.67; (Na+K)_A < 0.50 and Ti < 0.50), mostly inagnesio-hornblende and tschermakitic hornblende. The comparison with amphiboles from rocks of potential provenance areas reveals that the Randamphibolit-Series of the Miinchberg Massif – or an equivalent, already eroded unit – can be regarded as source rock of the detrital amphiboles.

The presented data are the first evidence, that the Randamphibolit of the Miinchberg Massif was exhumed as early as in the Famennian, shortly after its metamorphism. It can be concluded that before Famennian time the complete Saxothuringian oceanic crust and large parts of the Saxothuringian continental crust had been subducted at the active margin. This implies that the collision of the Saxothuringian plate with the Tepla-Barrandian microplate, leading to the accretion of the Saxothuringian plate, happened 15–20 Ma earlier than previous authors had supposed. Accordingly, the collisional stage must have been reached not later than in the middle Devonian (approx. 380 Ma).  相似文献   

西准噶尔包古图-哈图地区“太勒古拉组”使用商榷     

向坤鹏  李永军  徐磊  张宏伟  佟丽莉 《新疆地质》2013,(3)

新疆西准噶尔包古图-哈图地区石炭系广泛出露。近年来1∶5万区域地质调查证实,前人在包古图地区建立和命名的下石炭统“太勒古拉组”层型由早石炭世包古图组细碎屑岩和晚泥盆世克拉玛依蛇绿构造混杂岩带两部分组成。本文主要讨论“太勒古拉组”在西准噶尔地区的使用和相关商榷。  相似文献   

Consultas and Socially Responsible Investing in Guatemala: A Case Study Examining Maya Perspectives on the Indigenous Right to Free,Prior, and Informed Consent     

J. P. Laplante 《社会与自然资源》2014,27(3):231-248

Since 2005, more than 78 Maya communities representing approximately one million Guatemalans have held referendums called consultas comunitarias, which ask the community whether they are in agreement with mineral, hydroelectric, and/or other megaprojects in their traditional territory. Participation in the consultas is a form of resistance to the granting of mineral rights to corporate interests. In Canada, where much of the Guatemalan mining investment is based, “socially responsible investment firms” (SRIs) promote corporate respect for Indigenous rights. Based on interviews and participant observation, we highlight the perspectives of Maya consulta organizers in three communities that have undertaken consultas to resist the mining licenses of the Canadian mining company Goldcorp, Inc. We argue that a strict policy of corporate respect for the right to free, prior, and informed consent of affected communities is a minimum requirement for Maya acceptance of SRI legitimacy.  相似文献   

2003年3月北大西洋上两个爆发性气旋的“吞并”过程及发展机制分析     

傅刚  张雪贝  孙柏堂  鄢珅  陈莅佳 《中国海洋大学学报(自然科学版)》2022,52(3):8-27

本文利用欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts,ECMWF)提供的0.125(°)×0.125(°)的ERA-Interim再分析资料、美国国家航空航天局(National Aeronautics and Space Administration,NASA)提供的MODIS(Moderate Resolution Imaging Spectroradiometer)可见光云图、气象卫星合作研究所(Cooperative Institute for Meteorological Satellite Studies,CIMSS)提供的GOES-EAST红外卫星云图等资料以及WRF(Weather Research and Forecasting)数值模式的模拟结果,对2003年3月北大西洋上一个爆发性气旋B“吞并”另一个气旋A后快速发展机制进行了分析。气旋A和B均生成于美国东部,气旋A于2003年3月5日06 UTC生成,气旋B于6日00 UTC生成,且比气旋A向东北方向移动得更快,7日18 UTC达到最大加深率3.27 hPa·h^-1。在北大西洋中部地区,从8日00 UTC开始,气旋B吞并气旋A后形成气旋C,8日12 UTC气旋C中心气压达到最低值938.3 hPa。高空急流、低空水汽输送和潜热释放为气旋A和气旋B的快速发展提供了有利的环流背景场。气旋B吞并气旋A的过程经历三个阶段:前期阶段、吞并阶段、完成阶段。利用WRF模式模拟结果的分析表明,气旋A和B之间建立水汽输运通道,水汽从气旋A向气旋B输送。气旋B吞并气旋A后形成气旋C快速发展的主要原因是暖平流的作用。  相似文献   

A Review of “Hot,Flat and Crowded: Why We Need a Green Revolution—And How It Can Renew America”     

Greg Bierly 《The Professional geographer》2013,65(2):284-286

Based on a county-level Chinese industry survey data set, this article aims to extend the agglomeration literature by applying and comparing selected combination indexes of geographical concentration that incorporate both traditional indexes of inequality and measures of spatial autocorrelation at the global level and by applying and comparing a new measure, the focal location quotient (FLQ), to the local Moran's I, a commonly used local indicator of spatial association, at the county level. At the global level, the results show that the combination indexes used are generally effective for comparing the extent of geographical concentration across industries, and they could serve as useful dependent variables in modeling agglomeration effects across industries. At the local level, specific spatial patterns of production concentrations are identified for textiles, machinery, food manufacturing, and the electronics and telecommunication industries. FLQ tends to generate more generalized patterns than does the local Moran statistic. Mapping the local statistics is useful in supplementing the global measures, and those maps tend to support the results of the global combination indexes.  相似文献   

Migration,Sources of Income,and Community Change in the Nonmetropolitan Northwest     

《The Professional geographer》2013,65(4):418-430

During the late 1980s and the first half of the 1990s, the nonmetropolitan Northwest grew quite rapidly, narrowing the gap between the growth rates of the metropolitan Northwest, and oupacing national rates. This growth was largely the result of in-migration from regional and national metropolitan areas. Traditional economic base theory does not explain the recent growth, as employment levels in in the region's basic industries continue to stagnate and decline, and the sources of income for these in-migrants remain a mystery. This paper utilizes data from the 1990 Public Use Microdata Sample (PUMS) to determine the extent to which metropolitan-origin migrants are measurably different from oldtime nonmetropolitan residents on certain socioeconomic variables, in an attempt to understand the ways in which the newcomers survive financially. Analysis of variance (ANOVA) shows that newcomers are younger, earn less in wages and salary, receive more nonearnings income, and reside in more valuable housing compared with the resident population. Discriminant analysis shows that differences in the earned income measures are largely explained by age differences, while the nonearnings income and value of residence remainsignificantly higher for the metropolitan origin migrants even when age and earned income are controlled. While the analysis indicates that measurable socioeconomic differences do exist between the two populations, it appears that the current wave of growth and change in the nonmetropolitan Northwest is much more complicated than a simple newcomer-oldtimer dichotomy.  相似文献   

面向国土空间规划的测绘地理信息技术及数据成果服务应用展望   总被引：1，自引：0，他引：1  

王伟  金贤锋 《测绘通报》2020,(12):58-64

新时代国土空间规划体系的顶层设计和“四梁八柱”建设及未来的智慧型国土空间规划需要数字化、信息化技术支撑。以空间数据获取与分析为主要特征的测绘地理信息，能为国土空间规划的编制、审批、修改和实施监督各环节提供有效的技术服务和基于数据成果的定制服务。而融合现状数据、规划数据、管理数据，实现统一“底图”、统一“底数”、统一“底线”、统一“底板”的国土空间规划“一张图”，以及支撑国土空间规划动态监测评估预警的国土空间规划“一张图”实施监督信息系统，是可感知、能学习、善治理和自适应的智慧型国土空间规划发展的重要保障。本文在梳理“五级三类”国土空间规划体系基本构成和特征的基础上，从技术体系和数据成果定制体系两个方面，研究了面向国土空间规划的测绘地理信息服务体系，展望了面向智慧型国土空间规划的测绘地理信息应用。  相似文献   

城市旅游“三生”竞争力空间分异——以西北五省为例          下载免费PDF全文

杨发鹏  张雪唱  李宗阳 《干旱区地理》2019,42(3):664-672

基于“三生”理念的指导，以西北五省的29个中国优秀旅游城市为研究对象，建立一套城市生产—生活—生态旅游竞争力模型，利用ESDA方法测算旅游“三生”竞争力的空间集聚程度、自然间断点分级聚类展示旅游生产、生活、生态的空间格局，同时结合相关性分析与AHP赋权解剖其影响因素。结果表明，样本城市旅游“三生”竞争力整体趋弱，空间分布离散，局部地区聚集效应低，其中国内旅游消费、公厕个数和降水量是城市旅游“三生”竞争力的主导因素。最终，29个城市依据实证结果可划分为生产型、生活型和生态型旅游城市，在西北五省共同组建4个“三生”旅游圈，为区域旅游发展提供新型合作机制。  相似文献   

村域尺度“三生”功能与生活质量感知空间格局及其关联——以江苏省扬中市为例   总被引：6，自引：1，他引：5  

李欣  方斌  殷如梦  许昕  陈添悦 《地理科学》2020,40(4):599-607

以经济发达区江苏省扬中市为例,基于土地利用变更调查及农户抽样调查数据,利用因子分析、GIS空间分析、标准差椭圆等方法对居民生活质量与生产、生活和生态（三生）功能水平空间格局进行定量测度及关联研究。结果表明:① 研究区各单一功能水平不等,空间形态差异显著;“三生”功能水平整体较低,高值区分散,低值区长江沿岸、建成区周边集聚,与生产功能高低值集聚区空间重叠度高。② 扬中市居民生活质量主观感知总体为中等水平,相邻村域生活质量感知趋同,高值区集中于三茅街道及五一村、丰乐村等地,低值区呈零星散布状。③ 研究区“三生”功能与生活质量主观感知整体空间关联密切,局部因地域分异及公共基础设施与环境条件差异有所偏差,未来仍需因地制宜强化管理,协调区域生产-生活-生态功能关系。  相似文献   

The “easy restriction” syndrome drive local fish stocks to extinction: The case of the management of Swedish coastal populations     

《Marine Policy》2017

Spatially sensitive management built on detailed biological and socio-economic knowledge is required to establish sound fishing regulations and to avoid extinction of small coastal populations of fish and shellfish. Highly productive isolated populations of several commercial species have historically inhabited the Swedish west coast, but during the past century these populations have been depleted by fisheries and with no sign of recovery. Since 1999 several fisheries regulations and different stakeholder co-management initiatives have flourished along the Swedish coast of the Skagerrak. They aimed to facilitate the recovery of collapsed local stocks but the established regulations failed to identify and restrict the main sources of mortality acting on local stocks and they have thus been ineffective to promote the recovery. Furthermore, regulations have operated on the weakest among stakeholders (e.g.. recreational fishers), which have minor influence over management, and the restrictions have been imposed without providing any data which supported the choice (i.e. the “easy restriction” syndrome). In line with the general “spirit” of recent Swedish fishery management, we conclude that managers, without the disapproval of Swedish scientists, have circumvented limitations which should address the largest mortality factor, i.e. the commercial fishery. The regulations presently in place, have been politically uncontroversial and easy to implement, but have been highly unsuccessful. We therefore suggest that stakeholders, including politicians, should start focusing on more effective and science-based management and less on what is politically attractive if Swedish citizens shall have a chance to witness the recovery of their once flourishing coastal populations.  相似文献