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The study area is located southeast of Dehshir between the Urumieh-Dokhtar Magmatic Arc and Nain-Baft Ophiolite Belt comprising the Nain, Dehshir, Shahr Babak, and Baft ophiolite complexes. The Dehshir Ophiolitic Complex which obducted in the Late Cretaceous, consists mainly of ultramafic rocks. These remnants of oceanic crust are extensively faulted and fractured. The severe faulting and brecciating of the ophiolite sequence have undergone high-grade alteration and changed it to the tectonic mélange. The Dehshir colored mélange is bounded to the west by Dehshir fault which is a right-lateral offset of the Nain-Baft suture. In this research, the petrographic studies of the area showed that the ultramafic rocks consist mainly of dunite and harzburgite intruded by diabasic dikes. Syntectonic hydrothermal fluids circulated throughout these rocks. Migration of Mg-rich fluids and hydrothermal brecciating occurred within highly altered and brecciated zones. Magnesite precipitated from hydrothermal solutions and formed the massive, lenticular, and vein-type ore deposits in serpentinized-hosted rocks. Later on, magnesite turned into hydromagnesite due to hydration at the lower depths near the surface. According to the X-ray diffraction and X-ray fluorescence analysis, hydromagnesite is the most dominant and widely occurring Mg-rich carbonate mineral in this area. The main alteration is serpentinization but birbiritization also occurs as a result of interaction between fluids and ultramafic rocks. 相似文献
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Azat Zana Gündoğan 《Urban geography》2013,34(7):893-917
This article examines the role of state affinity in community struggles against authoritarian, neoliberal urban transformation projects (UTPs) in Turkey. It argues that as neoliberal hegemonic devices, UTPs produce contentious political spaces within which communities negotiate, resist, or comply with state-imposed, pro-market rationales (i.e. common sense). As an alternative to depictions of subaltern communities in mobilization as totally ‘co-opted‘ or ‘victimized‘ in neoliberal renewal or as ’unwilling’ or ’unable’ to produce a collective rights identity, the analysis offers a more complicated picture of community resistance, inactivity, and co-optation. To do this, it adopts a combination of Henri Lefebvre’s theory of production of space and Antonio Gramsci’s theory of hegemony. The analysis is based on the findings from original ethnographic research on two ethnically distinct working-class neighborhoods under UTP threat in Gebze, a satellite city of Istanbul. It compares communities’ affinity with the state-sponsored ideologies (Sunni-Turkish nationalism, neoliberalism) by looking at their ethnic identities and social histories. 相似文献
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