Hydrogeology of the Krafla geothermal system,northeast Iceland

The Krafla geothermal system is located in Iceland's northeastern neovolcanic zone, within the Krafla central volcanic complex. Geothermal fluids are superheated steam closest to the magma heat source, two‐phase at higher depths, and sub‐boiling at the shallowest depths. Hydrogen isotope ratios of geothermal fluids range from ?87‰, equivalent to local meteoric water, to ?94‰. These fluids are enriched in ¹⁸O relative to the global meteoric line by +0.5–3.2‰. Calculated vapor fractions of the fluids are 0.0–0.5 wt% (~0–16% by volume) in the northwestern portion of the geothermal system and increase towards the southeast, up to 5.4 wt% (~57% by volume). Hydrothermal epidote sampled from 900 to 2500 m depth has δD values from ?127 to ?108‰, and δ¹⁸O from ?13.0 to ?9.6‰. Fluids in equilibrium with epidote have isotope compositions similar to those calculated for the vapor phase of two‐phase aquifer fluids. We interpret the large range in δD_EPIDOTE and δ¹⁸O_EPIDOTE across the system and within individual wells (up to 7‰ and 3.3‰, respectively) to result from variable mixing of shallow sub‐boiling groundwater with condensates of vapor rising from a deeper two‐phase reservoir. The data suggest that meteoric waters derived from a single source in the northwest are separated into the shallow sub‐boiling reservoir, and deeper two‐phase reservoir. Interaction between these reservoirs occurs by channelized vertical flow of vapor along fractures, and input of magmatic volatiles further alters fluid chemistry in some wells. Isotopic compositions of hydrothermal epidote reflect local equilibrium with fluids formed by mixtures of shallow water, deep vapor condensates, and magmatic volatiles, whose ionic strength is subsequently derived from dissolution of basalt host rock. This study illustrates the benefits of combining phase segregation effects in two‐phase systems during analysis of wellhead fluid data with stable isotope values of hydrous alteration minerals when evaluating the complex hydrogeology of volcano‐hosted geothermal systems.     

EMPIRICAL STUDIES IN INDUSTRIAL LOCATION: AN ASSESSMENT OF THEIR METHODS AND RESULTS*

ABSTRACT This paper surveys recent evidence on the determinants of (national and/or foreign) industrial location. We find that the basic analytical framework has remained essentially unaltered since the early contributions of the early 1980s while, in contrast, there have been advances in the quality of the data (more firm and plant level information, geographical disaggregation, panel structure, etc.) and, to a lesser extent, the econometric modeling. We also identify certain determinants (neoclassical and institutional factors) that tend to provide largely consistent results across the reviewed studies. In light of this evidence, we finally suggest future lines of research.     

Planning Innovations in Land Management and Governance in Fragmented Rural Areas: Two Examples from Galicia (Spain)

Land fragmentation can be an important drawback for the development of rural areas. Due to the small size of the units, land management and planning are difficult from both the private and the public point of view. In some regions of Europe, land fragmentation can lead to the collapse of land-based activities such as agriculture and forestry. This process triggers land abandonment, which causes social, economic and environmental problems. Traditional interventions such as land consolidation have not worked because of the scale of land fragmentation, which leads to huge transaction costs. New planning instruments and governance structures for land management that balance the relations between property rights, management and labour force can be developed, in order to avoid the problems of land fragmentation. In this paper, we present two innovative examples of land management and governance structures for dealing with land fragmentation in rural areas of Galicia northwestern Spain. They were able to combine the use of individual and common property rights to make land use more sustainable, instead of trying to change land ownership. The new governance structures helped to increase efficiency and sustainability of the land use by, for example, increasing labour productivity, clarifying property rights and diminishing land abandonment.     

The Ubiquity of Rhetoric and Hermeneutic Philosophy

This essay examines how hermeneutic philosophy, particularly Gadamer's, recovers rhetoric, less as the art of speaking well than as a statement of a truth of the sensus communis, that which communicates veracious content through argumentation. This is the sense in which Gadamer acknowledges the ubiquity of rhetoric and hermeneutics as components of linguisticity (Sprachlichkeit). Conceived in the context of non-methodical wisdom and phronesis, Gadamer's rehabilitated rhetoric is concerned with pragmatics and ethics. Rhetoric is no longer viewed as a technique of verbal manipulation and becomes relevant for dialogic communication. Gadamer thus joins the Habermasian criticism of formalized reason that is detached from values. Both of them reject instrumental reason, because it has colonized communicational reason. However, since Gadamer's view of rhetoric has also been criticized by Habermas and Ricoeur their objections cannot be overlooked in a discussion of his hermeneutics. The essay concludes with a brief consideration of the implications of the debate on rhetoric, hermeneutics, and communication for the twenty-first century.     

VERTICAL INDUSTRY RELATIONS,SPILLOVERS, AND PRODUCTIVITY: EVIDENCE FROM CHILEAN PLANTS*

ABSTRACT We use disaggregated data on Chilean plants, and the Chilean input–output table to examine the impact of agglomeration spillovers on total factor productivity (TFP). In common with previous studies, we find evidence for intraindustry spillovers, but none for general cross‐industry spillovers. This picture changes when we take vertical industry relations into account. There are important productivity spillovers from plants in upstream industries. Interestingly, a similar effect cannot be found from plants in downstream industries. The number of plants in these sectors has no effect on plant‐level TFP, just as the number of plants in other industries that are neither important upstream suppliers nor downstream customers also has no effect.     

Placing blame: Making sense of Beslan

The aftermaths of terrorist spectacles are intensely consequential moments in the making of geopolitical meaning. This paper develops a critical geopolitical account of the ways in which key actors involved in the terrorist incident at School Number 1 in Beslan North Ossetia constructed its meaning and justified their actions. The event is examined from three perspectives: the terrorist's Beslan, the Kremlin's Beslan and the contested meaning of Beslan among Ossetians and others in the North Caucasus. Multiple sources are utilized in the construction of the account: an English language archive of Russian reporting on the event, accounts of the siege, statements by key protagonists, elite interviews in North Ossetia, and the results of a survey question in North Ossetia and the North Caucasus on Beslan. The paper examines the construction of blame by the various actors and relates it to indiscriminate geographies, sweeping acts of abstraction whose homogenizing effects make (counter)terrorist violence possible.     

Trace-element evidence for foreigners at a Maya port in Northern Yucatan

The present paper explores the potentials of trace elements in human dental enamel to indicate mobility and to detect the presence of individuals who had migrated into a community after childhood. Three Pre-Hispanic samples of infants from the Yucatán peninsula were chosen, one from the northern coast (Xcambó), one from the coast of the Gulf of Mexico (Campeche) and the last one from the tropical inland rain forest (Calakmul). Infants’ first permanent molars are the term of reference because infants were very likely born in the same place where they died and therefore are supposed to represent the local geo-chemical environment. Their chemical signature was then compared to the one of the adults from the site of Xcambó. The elemental composition was recorded by means of laser ablation-time of flight-ICP-MS. Sr and Ba (and secondly Mg and I) discriminate well the three infant samples. All the Early Classic adults from Xcambó fall within the range of variation of the site’s infants, while 25% of the Late Classic adults fall outside the range in agreement with archaeological, bioarcheological, and isotopic evidence. LA-ICP-Ms analyses of trace elements in archaeological samples can be an important analytical tool to detect foreigners in local populations. The selection of infants as reference values helps reduce the limits faced by trace element analyses in past human populations studies.