P–T–t evolution of eclogite/blueschist facies metamorphism in Alanya Massif: time and space relations with HP event in Bitlis Massif, Turkey

© 2014, Springer-Verlag Berlin Heidelberg. The Alanya Massif, which is located to the south of central Taurides in Turkey, presents a typical nappe pile consisting of thrust sheets with contrasting metamorphic histories. In two thrust sheets, Sugözü and Gündogmus nappes, HP metamorphism under eclogite (550–567 °C/14–18 kbar) and blueschist facies (435–480 °C/11–13 kbar) conditions have been recognized, respectively. Whereas the rest of the Massif underwent MP metamorphism under greenschist to amphibolite facies (525–555 °C/6.5–7.5 kbar) conditions. Eclogite facies metamorphism in Sugözü nappe, which consists of homogeneous garnet–glaucophane–phengite schists with eclogite lenses is dated at 84.8 ± 0.8, 84.7 ± 1.5 and 82 ± 3 Ma (Santonian–Campanian) by 40Ar/39Ar phengite, U/Pb zircon and rutile dating methods, respectively. Similarly, phengites in Gündogmus nappe representing an accretionary complex yield 82–80 Ma (Campanian) ages for blueschist facies metamorphism. During the exhumation, the retrograde overprint of the HP units under greenschist–amphibolite facies conditions and tectonic juxtaposition with the Barrovian units occurred during Campanian (75–78 Ma). Petrological and geochronological data clearly indicate a similar Late Cretaceous tectonometamorphic evolution for both Alanya (84–75 Ma) and Bitlis (84–72 Ma) Massifs. They form part of a single continental sliver (Alanya–Bitlis microcontinent), which was rifted from the southern part of the Anatolide–Tauride platform. The P–T–t coherence between two Massifs suggests that both Massifs have been derived from the closure of the same ocean (Alanya–Bitlis Ocean) located to the south of the Anatolide–Tauride block by a northward subduction. The boundary separating the autochthonous Tauride platform to the north from both the Alanya and Bitlis Massifs to the south represents a suture zone, the Pamphylian–Alanya–Bitlis suture

Arithmetic Aspects of Bianchi Groups

We discuss several arithmetic aspects of Bianchi groups, especially from a computational point of view. In particular, we consider computing the homology of Bianchi groups together with the Hecke action, connections with automorphic forms, abelian varieties, Galois representations and the torsion in the homology of Bianchi groups. Along the way, we list several open problems and conjectures, survey the related literature, presenting concrete examples and numerical data

Revisiting the trustworthiness-performance-governance nexus in international joint ventures

This paper contributes to the research on international joint ventures (IJV) in the following ways: (1) by identifying different patterns of governance that partners in the post-formation period exercise and examining how contrasting patterns relate to variations in perceived partner’s trustworthiness, as well as to IJV performance; (2) by empirically testing the extent to which partners emphasize or even renegotiate and change different elements of governance; and (3) by complementing existing studies that have examined only unidirectional links among trustworthiness, performance and governance by considering possible simultaneous relationships that may exist among these variables. The findings from a survey and follow-up interviews with international joint ventures located in Taiwan reveal that levels of partners’ trustworthiness and performance satisfaction each, by itself, may lead to the deployment of different governance measures. However, it is the combinations of extreme (high or low) variants on both partners’ trustworthiness and performance satisfaction that seem to generate clearer patterns of governance. Low satisfaction and partners’ trustworthiness seem to encourage intensification of control or the deployment of more aggressive governance measures. In contrast, high performance satisfaction and partners’ trustworthiness may foster a combination of soft and routine forms of control