Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh
This research deals with the petrography and mineral chemistry of gabbroic and monzodioritic rocks to characterize the minerals, including their genesis and tectonic evolution. The rocks are dominated by gabbro in Barapaharpur and monzodiorite in Voktipur, and they contain plagioclase, hornblende, b...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Journal of Asian Earth Sciences: X |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S259005602200055X |
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| author | Ismail Hossain Toshiaki Tsunogae Nura Jannatun Md. Sazzadur Rahman Mowsumi Nahar A.S.M. Mehedi Hasan Most. Momotaz Khatun |
| author_facet | Ismail Hossain Toshiaki Tsunogae Nura Jannatun Md. Sazzadur Rahman Mowsumi Nahar A.S.M. Mehedi Hasan Most. Momotaz Khatun |
| author_sort | Ismail Hossain |
| collection | DOAJ |
| description | This research deals with the petrography and mineral chemistry of gabbroic and monzodioritic rocks to characterize the minerals, including their genesis and tectonic evolution. The rocks are dominated by gabbro in Barapaharpur and monzodiorite in Voktipur, and they contain plagioclase, hornblende, biotite, and magnetite, with few epidote and apatite, as well as clinopyroxene and orthopyroxene in gabbroic member. Chemical analyses of minerals were carried out by an electron microprobe analyzer. The chemistry of plagioclases is compositionally oligoclase-andesine and andesine, amphiboles are dominantly magnesiohornblende, biotites are Mg-biotites (phlogopite), and pyroxenes are diopside and enstatite types. The calculated P-T conditions of the gabbroic rocks yielded about 850–957 °C and 5.8–9.3 kbar, which are the highest geothermobarometric values in the region. However, the monzodioritic rocks yielded about 696–723 °C and 5.6–6.2 kbar. The estimated emplacement depths from the calculated highest pressure values equalize at ∼ 20–33 km and at ∼ 19–22 km, respectively. Biotite chemistry provides quantitative fO2 within QFM and HM buffers ranging from −10.6 to −12.0 in gabbroic rocks and −11.6 to −13.5 in quartz monzodiorite, respectively. These data are also echoed by amphibole and pyroxene mineral chemistry, which collectively demonstrate that the source materials were in a relatively higher oxidation state within arc magmatism. The mineral data also offer calc-alkaline I-type suites formed within subduction-related environments. However, gabbroic rocks show a dominantly island arc signature substantiating the suprasubduction zone, and also have the affinity of the island arc tholeiitic and calc-alkaline basaltic equivalents within orogenic environments and marginally boninitic affinities. |
| first_indexed | 2024-03-13T03:43:30Z |
| format | Article |
| id | doaj.art-59a623ba20e34b8984799e228c6edcd8 |
| institution | Directory Open Access Journal |
| issn | 2590-0560 |
| language | English |
| last_indexed | 2024-03-13T03:43:30Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Asian Earth Sciences: X |
| spelling | doaj.art-59a623ba20e34b8984799e228c6edcd82023-06-23T04:43:54ZengElsevierJournal of Asian Earth Sciences: X2590-05602023-06-019100134Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW BangladeshIsmail Hossain0Toshiaki Tsunogae1Nura Jannatun2Md. Sazzadur Rahman3Mowsumi Nahar4A.S.M. Mehedi Hasan5Most. Momotaz Khatun6Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh; Corresponding author at: Department of Geology and Mining, University of Rajshahi, Bangladesh.Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba, Ibaraki 305-8572, Japan; Department of Geology, University of Johannesburg, Auckland Park 2006, South AfricaDepartment of Geology and Mining, University of Rajshahi, Rajshahi 6205, BangladeshGraduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba, Ibaraki 305-8572, JapanDepartment of Geology and Mining, University of Rajshahi, Rajshahi 6205, BangladeshDepartment of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh; Institute of Mining, Mineralogy and Metallurgy (IMMM), BCSIR, Khanjanpur, Joypurhat 5900, BangladeshDepartment of Geology and Mining, University of Rajshahi, Rajshahi 6205, BangladeshThis research deals with the petrography and mineral chemistry of gabbroic and monzodioritic rocks to characterize the minerals, including their genesis and tectonic evolution. The rocks are dominated by gabbro in Barapaharpur and monzodiorite in Voktipur, and they contain plagioclase, hornblende, biotite, and magnetite, with few epidote and apatite, as well as clinopyroxene and orthopyroxene in gabbroic member. Chemical analyses of minerals were carried out by an electron microprobe analyzer. The chemistry of plagioclases is compositionally oligoclase-andesine and andesine, amphiboles are dominantly magnesiohornblende, biotites are Mg-biotites (phlogopite), and pyroxenes are diopside and enstatite types. The calculated P-T conditions of the gabbroic rocks yielded about 850–957 °C and 5.8–9.3 kbar, which are the highest geothermobarometric values in the region. However, the monzodioritic rocks yielded about 696–723 °C and 5.6–6.2 kbar. The estimated emplacement depths from the calculated highest pressure values equalize at ∼ 20–33 km and at ∼ 19–22 km, respectively. Biotite chemistry provides quantitative fO2 within QFM and HM buffers ranging from −10.6 to −12.0 in gabbroic rocks and −11.6 to −13.5 in quartz monzodiorite, respectively. These data are also echoed by amphibole and pyroxene mineral chemistry, which collectively demonstrate that the source materials were in a relatively higher oxidation state within arc magmatism. The mineral data also offer calc-alkaline I-type suites formed within subduction-related environments. However, gabbroic rocks show a dominantly island arc signature substantiating the suprasubduction zone, and also have the affinity of the island arc tholeiitic and calc-alkaline basaltic equivalents within orogenic environments and marginally boninitic affinities.http://www.sciencedirect.com/science/article/pii/S259005602200055XMineral chemistryGeothermobarometryOxygen fugacityTwo-pyroxenesPlagioclase-amphiboleBangladesh |
| spellingShingle | Ismail Hossain Toshiaki Tsunogae Nura Jannatun Md. Sazzadur Rahman Mowsumi Nahar A.S.M. Mehedi Hasan Most. Momotaz Khatun Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh Journal of Asian Earth Sciences: X Mineral chemistry Geothermobarometry Oxygen fugacity Two-pyroxenes Plagioclase-amphibole Bangladesh |
| title | Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh |
| title_full | Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh |
| title_fullStr | Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh |
| title_full_unstemmed | Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh |
| title_short | Mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in Rangpur District, NW Bangladesh |
| title_sort | mineral compositional constraints on the petrogenesis of gabbroic and monzodioritic rocks in rangpur district nw bangladesh |
| topic | Mineral chemistry Geothermobarometry Oxygen fugacity Two-pyroxenes Plagioclase-amphibole Bangladesh |
| url | http://www.sciencedirect.com/science/article/pii/S259005602200055X |
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