Organic–inorganic rock–fluid interactions in stylolitic micro‐environments of carbonate rocks: a FIB‐TEM study combined with a hydrogeochemical modelling approach

Stylolites and the interfaces to the host limestone have been investigated by means of a multidisciplinary analytical approach (thin section microscopy, FIB‐TEM, organic geochemistry and petrography). Carbonate dissolution assuming different boundary conditions was simulated by applying a generic hydrogeochemical modelling approach. It is the conceptual approach to characterize and quantify traceable organic–inorganic interactions in stylolites dependent on organic matter type and its thermal maturity, and to follow stylolite formation in carbonates as result of organic matter reactivity rather than pressure solution as a main control. The investigated stylolite samples are of Upper Permian (Lopingian, Zechstein), Middle Triassic (Muschelkalk) and Late Cretaceous (Maastrichtian) age and always contain marine organic matter. The thermal maturity of the organic matter ranges from the pre‐oil generation zone (0.4–0.5% R_r) to the stage of dry gas generation (>1.3% R_r). The results of the generic hydrogeochemical modelling indicate a sharp increase of calcite dissolution and the beginning of stylolite formation at approximately 40°C, which is equivalent to a depth of less than 800 m under hydrostatic conditions considering a geothermal gradient of 30°C and a surface mean temperature of 20°C. This temperature corresponds to the pre‐oil window when kerogens release an aqueous fluid enriched in carbon dioxide and organic acids. This aqueous fluid may change the existing pore water pH or alkalinity and causes dissolution of carbonate, feldspar and quartz, and clay mineral precipitation along the stylolite. Dissolution of limestone and dolostone leads to reprecipitation of calcite or dolomite opposite of the dissolution side, which indicates only localized mass redistribution. All these integrated hydrogeochemical processes are coupled to the generation of water during organic matter maturation. In all of the calculated hydrogeochemical scenarios, H₂O is a reaction product and its formation supports the suggested hypothesis.     

Devonian trilobites from the Shogrām Formation,Kurāgh,Chitral (NW Pakistan)

Late Devonian trilobites from horizons close to the Frasnian-Famennian boundary in the Shogrām Formation at Kurāgh, Chitral (NW Pakistan) are described. A new species of Asteropyginae, Neocalmonia chitralensis sp. nov., and a new subpecies, Neocalmonia batillifera orientalis subsp. nov., are described; these extend the range of Asteropyginae eastwards from Iran and southern Afghanistan. The Upper Kellwasser Event is located within KUR 19 of Talent et al. (1999).     

The Freedom of Archaeological Research: Archaeological Heritage Protection and Civil Rights in Austria (and Beyond)

Archaeologists like to think that heritage protection laws serve the purpose of protecting all archaeology from damage. Thus, provisions like that of §11 (1) Austrian Denkmalschutzgesetz or Art. 3 i-ii of the Valletta Convention are interpreted as a blanket ban on archaeological fieldwork ‘unauthorized’ by national heritage agencies, and a general prohibition against archaeological field research by non-professionals. The Austrian National Heritage Agency, the Bundesdenkmalamt, interprets the Austrian law in this way. Using the Austrian example as a case study, this paper demonstrates that this interpretation must be wrong, since, if it were true, it would revoke a fundamental civil right enshrined both in the Austrian constitution and the Charter of Fundamental Rights of the European Union: the unconditional freedom of research, which applies to archaeological field research as to any other kind of academic research, and extends equally to every citizen.     

THE GREEN ECONOMY AND POST‐GROWTH REGIMES: OPPORTUNITIES AND CHALLENGES FOR ECONOMIC GEOGRAPHY

While mainstream economic geography is doing increasing research on green manufacturing and services, with a few notable exceptions, its predominant conceptual approaches to emerging modes of economic orientation continue to examine economic transitions somewhat unreflexively within the context of traditional growth paradigms. The aim of this article is to explore and critically examine neoliberal discourses on the green economy and smart growth by exploring contributions to debates on green economics proposed by ideas linked to post‐growth economies. Based on studies by scholars such as Tim Jackson and Serge Latouche, the article examines the contours of debates on post‐growth, décroissance (de‐growth) and prosperity without growth. We begin by examining growth debates and existing contributions by economic and other geographers to the exploration of alternatives to conventional growth‐centred economics. We then identify some emergent spatial facets of post‐growth transitions and utilize these to explore potential research topics and opportunities for empirical and conceptual contributions by economic geographers to academic and societal debates on economic transitions and post‐growth paradigms. Particular attention is paid to approaches currently discussed in economic geography, such as socio‐technical transition studies.     

Book reviews

Women and Revolution in Iran. Edited by Guity Nashat. Boulder, Colorado: Westview Press, 1983. 301 pp.

Religion and Politics in Iran: Shi'ism from Quietism to Revolution. Edited by Nikki R. Keddie. New Haven: Yale University Press, 1983. x + 225 pp. $27.50. (cloth), $8.95 (paper).

The Persians amongst the English, Episodes in Anglo‐Persian History. By Denis Wright. London: I. B. Tauris & Co. Ltd., 1985.

Iran under the Safavids. By Roger M. Savory. Cambridge: Cambridge University Press, 1980.     

GLOBAL HISTORY,ENTANGLED AREAS,CULTURAL CONTACTS–AND THE ANCIENT WORLD

正Intertwined Institutions:Slavery as an Example While Global History and Entangled History are nowadays very much focused on modern times,there is a central area in which ancient history has set the pace for research since the 18th century:slavery.Slavery was common in many parts of the world up to the 19th century,it connected regions that were far apart,and it had drastic repercussions on both the"delivering"and the"receiving"areas.The