caa a22 4500 445389834 CHVBK 20180317143043.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00710-011-0151-0 doi (NATIONALLICENCE)springer-10.1007/s00710-011-0151-0 Thermal microstructural changes of grain-supported limestones [Elektronische Daten] [Abdel Soltan, Wolf Kahl, Mahmoud Hazem, Mechael Wendschuh, Reinhard Fischer] The microstructure of grainstone, grain-supported limestone, samples representing different geographic and stratigraphic intervals in Egypt were examined before and after calcination at 950°C for 0.25, 0.5, 1 and 2h. The examination utilized are X-ray diffraction (XRD), X-ray fluorescence (XRF), transmitted light microscopy (TLM), scanning electron microscopy (SEM) and X-ray micro tomography (μ-CT). Both the free lime content and reactivity of the produced quicklime were measured. The quicklime produced at 950°C for 0.25 and 0.5h is un-reactive (RDIN < 10) due to its low content of free lime. However, quicklime produced at 1 and 2h conditions is highly reactive (RDIN > 30) with variable reactivity due to the differences in the lime microfabric. The grainstones enriched in nummulites resulted in quicklime of higher reactivity than those dominated by foraminifera, peloids and miliolids. This is mainly attributed to the preservation of the intraparticle pores of the original limestone and the development of pinhole and fracture micropores. The shape of pores and not their amount is the main controlling variable in the quicklime reactivity. The grainstones enriched in fracture pores showed more reactive lime, whereas those with compact structures are less reactive post calcination. Springer-Verlag, 2011 Soltan Abdel Geology Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt aut Kahl Wolf Geosciences Department, University of Bremen, 28359, Bremen, Germany aut Hazem Mahmoud Chemistry Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt aut Wendschuh Mechael Crystallography Department, Faculty of Science, Bremen University, 28359, Bremen, Germany aut Fischer Reinhard Crystallography Department, Faculty of Science, Bremen University, 28359, Bremen, Germany aut Mineralogy and Petrology Springer Vienna 103/1-4(2011-11-01), 9-17 0930-0708 103:1-4<9 2011 103 710 https://doi.org/10.1007/s00710-011-0151-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-011-0151-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Soltan Abdel Geology Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt aut NATIONALLICENCE 700 1- Kahl Wolf Geosciences Department, University of Bremen, 28359, Bremen, Germany aut NATIONALLICENCE 700 1- Hazem Mahmoud Chemistry Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt aut NATIONALLICENCE 700 1- Wendschuh Mechael Crystallography Department, Faculty of Science, Bremen University, 28359, Bremen, Germany aut NATIONALLICENCE 700 1- Fischer Reinhard Crystallography Department, Faculty of Science, Bremen University, 28359, Bremen, Germany aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer Vienna 103/1-4(2011-11-01), 9-17 0930-0708 103:1-4<9 2011 103 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer