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HYDROTHERMAL ALTERATION OF MAGMATIC TITANITE: EVIDENCE FROM PROTEROZOIC GRANITIC ROCKS, SOUTHEASTERN SWEDEN

¹ Department of Petroleum Geosciences, The Petroleum Institute, Abu Dhabi, P.O. Box 2533, Abu Dhabi, United Arab Emirates, and Department of Earth Sciences, Uppsala University, Villavägen 16, SE–752 36 Uppsala, Sweden
² Department of Petroleum Geosciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE 1410, Brunei Darussalam, and Department of Earth Science, Faculty of Science, Al-Fateh University, P.O. Box 13696, Tripoli, Libya
³ Departamento de Petrología y Geoquímica, Facultad de Geología, Universidad Complutense de Madrid, E–28040 Madrid, Spain
⁴ Department of Earth Sciences, King Fahd Univeristy of Petroleum and Minerals, Dhahran 3126, P.O. Box 1400, Saudi Arabia
⁵ AGR Petroleum, Karenslyst Allé 4, P.O. Box 444, NO–0278 Oslo, Norway

E-mail address: melghali{at}fos.ubd.edu.bn

Magmatic titanite in Proterozoic granitic rocks from southeastern Sweden has been subjected to hydrothermal dissolution and replacement by finely crystalline Fe-dominant chlorite and TiO₂ (± quartz ± calcite). These alteration patterns require the redistribution of the highly immobile Ti and Al on the thin-section scale. The chloritization of titanite involved the formation of an intermediate Al–Fe-rich phase probably comprising intimately intergrown, submicroscopic chlorite and titanite. The creation of microporosity by the hydrothermal alteration of titanite may enhance the diffusive flux of matter, and hence the rate of reactions in granitic rocks. The alteration of titanite is most pronounced in red-stained granitic rock zones enriched in partly dissolved biotite and magnetite, which could have acted as local source of Al, Fe and Mg needed for chlorite formation.

Keywords: titanite, alteration, hydrothermal process, granite, Proterozoic, Sweden.