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Fluid components in accessory minerals of pan-african granitoids in the S■r Rondane Mountains, East Antarctica

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1004-1010页

作者： LI Zi-long CHEN Han-lin YANG Shu-feng TAINOSHO Yoshiaki SHIRAISHI Kazuyuki OWADA Masaaki Department of Earth Science College of Science Zhejiang University Hangzhou 310027 China Faculty of Human Development Kobe University Nada Kobe 657-8507 Japan National Institute of Polar Research Kaga 1-chome ltabashi-ku Tokyo 173-8515 Japan Department of Earth Sciences University of Yamaguchi Yamaguchi 753-8512 Japan Department of Earth and Planetary Science Harvard University Cambridge MA 02138 USA

Fluids （fluorine, chlorine, and OH） in accessory minerals （apatite, titanite and allanite） of pan-african granitoids （Group-I granitoids, Group-II granitoids and Mefjell Plutonic Complex） from the Sor Rondane Mountains, East Antarctica were precisely measured by an electronic microprobe analyzer in this study. Apatites in the granites have commonly high fluorine contents. However, fluorine contents from the Group-Ⅰ, Group-Ⅱ granitoids and Mefjell Plutonic Complex （MPC） are of important variation, which F contents （3.21-7.20 wt%） in apatite from the Group-Ⅱ granitoids are much higher than those from the Group-Ⅰ granitoids （1.22-3.60 wt%） and the MPC （3.21-4.11 wt%）. Titanite in the MPC has a low fluorine content （0.23-0.50 wt%）, being less than those in the Group-Ⅰ granitoids （2.28 wt%） and Group-Ⅱ granitoids （1.85-2.78 wt%）. Fluorine in allanite in the Group-Ⅱ granitoids seems to have much lower contents than those from the Group-Ⅰ granitoids and the MPC. Higher fluorine contents in the titanite from the Group-Ⅱ granitoids may be mainly controlled by late-magmatic fluid-rock interaction processes associated with melt, but may not be indicative of original magma contents based on its petrographic feature, Due to very lower chlorine contents from all of accessory minerals, the authors suggest that titanite and apatite with higher fluorine contents in the Group-Ⅱ granitoids have much lower H2O （OH） contents compared with those in the Group-Ⅰ granitoids according to the partition among （F, Cl, OH）. Fluorine contents in whole-rock samples show a variation from the higher in the Group-Ⅰ granitoids to the lower in the Group-Ⅱ granitoids and the MPC, which are consistent with the changes of those from the biotite and hornblende as well as fluorite occurred in the Group-Ⅰ granitoids reported previously. Based on the above study of fluorine in accessory minerals and combined with the previous fluorine contents from biotites and hornblendes, the authors suggest that apatites a

关键词： Fluorine contents Accessory minerals pan-african granitoids Sor Rondane Mountains Antarctica

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Petrology, Age and Geodynamic Implication of the panafrican granitoids Associated with the Glito-Kpatala Shear Zone (South-East Togo)

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International Journal of Geosciences 2023年第12期14卷 1193-1225页

作者： Gnanwasou Alayi Sarakawa Abalo Malibida Kpanzou Yao Agbossoumondé Essodina Padaro René-Pierre Menot Mahaman Sani Tairou Départment de Géologie Faculté des Sciences Université de Lomé Lomé Togo Laboratoire Magmas et Volcans Université Jean Monnet Saint Etienne France

The granitic plutons associated with the Glito-Kpatala shear zone are composed of biotite and amphibole granodiorites, biotite granites, two-mica granites and aplitic granites, which are very poorly represented. The chemical and mineralogical compositions of these facies indicate that they are I type and belong to high-K calc-alkaline series, with a chemical metaluminous character displayed by the granodiorites relative to the biotite and two-mica facies whose chemical compositions vary between metaluminous and peraluminous caracter. The Th/Ta (14.04 - 43.82 ppm, mean = 26.05), Th/U (2.58 to 15.05 ppm, mean = 5.85 ppm), Zr/Hf (25.27 to 37.21, mean = 30.67 ppm) and Rb/Sr (0.16 to 4.32;mean = 1.67 ppm) ratios of these granitoids reveal a strong crustal involvement in their magmatogenesis. Variations in CaO/Na2O (0.47 - 1.44 ppm), Rb/Sr (0.14 - 0.27 ppm), Rb/Ba (0.07 - 0.14 ppm) and Sr/Y (38.21 - 174.42 ppm) ratios indicate that biotite and amphibole granodiorites with their excessive Ni (135.37 - 139.51 ppm) and Cr (395.73 - 447.74 ppm) were derived from a mafic to intermediate lower continental crust where garnet and/or amphibole were stable residual assemblage minerals. The moderate Sr/Y ratios (1.81 - 9.47 ppm) and low transition elements Ni (1 - 6.44 ppm) and Cr (7.89 - 13.47 ppm) contents in both the two-mica and biotite granites are consistent with their emplacement at relatively shallow depths in the upper to mean continental crust, at pressures below 10 Kbar. In the two-mica granites, moderate CaO/Na2O (0.20 - 0.57 ppm, mean = 0.38 ppm) and Rb/Ba (0.39 - 1.37, mean = 0.84 ppm) ratios and quite varied Rb/Sr (1.53 - 4.23 ppm, mean = 2.85 ppm) ratios indicate a predominant derivation from psammitic and pelitic metasediments rather than metagreywackes. These low ratios (0.25 ≤ CaO/Na2O ≤ 0.32, mean = 0.28 ppm;0.31 ≤ Rb/Ba ≤ 0.44, mean = 0.39 ppm;1.11 ≤ Rb/Sr ≤ 1.78, mean = 0.39 ppm) in biotite granites are more consistent with melt

关键词： pan-african granitoids Post-Collisional Shear Zone South-East Togo

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