Crystallization conditions and petrogenesis of the paleoproterozoic basement rocks in Bangladesh: An evaluation of biotite and coexisting amphibole mineral chemistry

Journal of Earth Science - Tập 25 - Trang 87-97 - 2014
Ismail Hossain1, Toshiaki Tsunogae2,3
1Department of Geology and Mining, University of Rajshahi, Rajshahi, Bangladesh
2Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba, Ibaraki, Japan
3Department of Geology, University of Johannesburg, Johannesburg, South Africa

Tóm tắt

The Paleoproterozoic (∼1.73 Ga) basement rocks from Maddhapara, Bangladesh show a large range of chemical variations including diorite, quartz diorite, monzodiorite, quartz monzonite and granite. These are composed of varying proportions of quartz+plagioclase+K-feldspar+biotite+ hornblende±epidote+titanite+magnetite+apatite and zircon. Amphibole and biotite, dominant ferromagnesian minerals, have been analyzed with an electron microprobe. The biotite, Mg-dominant trioctahedral micas, is classified as phlogopitic nature. Relatively high Mg (1.33–1.53 pfu), Mg# (0.52–0.59) and low AlVI (0.13–0.25 pfu) contents in the biotite reflect slightly fractionated magma, which might be a relative indicator for the origin of the parental magma. Biotite is also a very good sensor of oxidation state of the parental magma. Oxygen fugacity of the studied biotites estimate within the QFM and HM buffers and equilibrate at about −12.35 and −12.46, which exhibit the source materials were relatively higher oxidation state during crystallization and related to arc magmatism. Whereas, calcic amphiboles, a parental member of arc-related igneous suite, display consistent oxygen fugacity values (−11.7 to −12.3), low Al# (0.16–0.21) with H2Omelt (5.6 wt.%–9.5 wt.%) suggest their reliability with the typical values of calc-alkaline magma crystallization. The oxygen fugacity of magma is related to its source material, which in turn depends on tectonic setting. Discrimination diagrams and chemical indices of both biotite and amphibole of dioritic rocks reveal calc-alkaline orogenic complexes; mostly I-type suite formed within subduction-related environments. Moreover, igneous micas are used as metallogenic indicator. The biotites with coexisting amphibole compositions show an apparent calc-alkaline trend of differentiation. The study suggests that the trend of oxidized magmas is commonly associated with compressive tectonic and convergent plate boundaries.

Tài liệu tham khảo

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