Geochemical Characterization of Exposed Black Shale Sediments of Matamuhari Anticline, Bangladesh
International Journal of Environmental Protection and Policy
Volume 7, Issue 3, May 2019, Pages: 86-92
Received: May 31, 2019;
Accepted: Jul. 3, 2019;
Published: Jul. 19, 2019
Views 379 Downloads 74
Ashraf Ali Seddique, Department of Environmental Science and Engineering, Jatiya Kabi Kazi Nazrul Islam University, Mymensingh, Bangladesh
Nazmul Islam, Department of Petroleum and Mining Engineering, Jessore University of Science and Technology, Jessore, Bangladesh
Shree Bipulendu Basak, Department of Environmental Science and Engineering, Jatiya Kabi Kazi Nazrul Islam University, Mymensingh, Bangladesh
Muhammad Badruzzaman, Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
Abdul Batin, Bangladesh Petroleum Exploration and Production Company Ltd., Dhaka, Bangladesh
Matamuhari anticline is one of the largest anticline situated at Bandarban district of Bangladesh which is 60 km long and 20 km wide in the part of Bangladesh. Like other part of Bangladesh the whole sequence of exposed rocks of Matamuhari anticline is composed with Neogene sedimentary rocks of shale, sandstone, siltstone, silty shale, tabular and spheroidal calcareous concretions. Seven outcrop black shale samples were collected during February 2013 from the different parts of the anticline namely Boro Bari Jhiri, Ochir Jhiri and Tak Chara area were mineralogically and geochemically examined in order to better understand the depositional environment in the studied area. The major and trace elements were analyzed using XRF spectrometry. Two distinct lithofacies assemblages, mud and silty-clay are found in the collected sediments. The shales are predominated by quartz, kaolinite, chlorite, mica (muscovite and biotite), feldspar (both K-feldspar and plagioclase), and in addition to a variable ratio of vermiculite. Lithologial characteristics and geochemical data demonstrated that sediments are enriched with TOC contents ranging from 0.39 to 0.67 wt.% and shows distinctive correlation to concentration of TOC and particle size distribution. These shales are characterized by a low Mg and K as well as high Al and Fe contents. Studies also show that the values of MgO/Al2O3 and K2O/Al2O3 ratio ranges from 0.15 to 0.17 and 0.18 to 0.20 respectively. The relationship of log MgO/Al2O3 and log K2O/Al2O3 values reveals that all of the studied samples fell within the marine environment. Ni/Co ratio of the studied shale samples ranges from 2.84 to 3.88 (average 3.36). These low values of Ni/Co ratio suggest that the sediments were deposited under oxic conditions. However, the above observations suggest that the sediments of Matamuhari anticline area were deposited in a shallow marine environment under oxic conditions.
Ashraf Ali Seddique,
Shree Bipulendu Basak,
Geochemical Characterization of Exposed Black Shale Sediments of Matamuhari Anticline, Bangladesh, International Journal of Environmental Protection and Policy.
Vol. 7, No. 3,
2019, pp. 86-92.
Ahmed S., Uddin M. N., Batin M. A., (2012). Geological Report on Matamuhari Anticline.
Alam, M., Alam, M. M., Curray, J. R., Chowdhury, M. L. R., Gani, M. R., (2003). An overview of the sedimentary geology of the Bengal basin in relation to the regional tectonic framework and basin-fill history. Sediment. Geol. 155, 179–208.
Alam, M. M., and Karim, S. M. R., (1997). Facies and environmental analysis of the Neogene (Surma Group) clastic succession in the Mirinja anticline, Folded Belt of the Bengal Basin, Bangladesh. Bangladesh Geosci. J. 3, 19–32.
Evans, P., (1932). Tertiary succession in Assam. Trans. Min. Geol. Inst. India 27, 155–260.
Khan, F. H. (1991). Geology of Bangladesh, Wiley, New Delhi. 207pp.
Gani, M. R., and Alam, M. M., (1999). Trench-slope controlled deep-sea clastics in the exposed Surma Group in the southeastern fold belt of the Bengal Basin, Bangladesh. Sediment. Geol. 127, 221–236.
Gani, M. R., and Alam, M. M., (2003). Sedimentation and basin-fill history of the Neogene clastic succession exposed in the southeastern fold belt of the Bengal Basin, Bangladesh: a high-resolution sequence stratigraphic approach, Sedimentary Geology 155, 227–270.
Gulbay R. K., Kırmacı M. Z., Korkmaz S., (2012). Organic geochemistry and depositional environment of the Aptian bituminous limestone in the Kale Gumus_hane area (NE-Turkey): An example of lacustrine deposits on the platform carbonate sequence. Organic Geochem. 49, 6–17.
Johnson, S. Y., and Alam, A. M. N., (1991). Sedimentation and tectonics of the Sylhet Trough, Bangladesh. Geol. Soc. Am. Bull. 103, 1513–1527.
Jones B., Manning D. C., (1994). Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones. Chem. Geol. 111, 111–129.
Jarvie, D. M., (1993). Total organic carbon (TOC) analysis. In: Merrill, R. K. (Ed.), Source and Migration Processes and Evaluation Techniques. AAPG, Tulsa, Oklahoma, pp. 113–118.
Mousa A. D., Abdou A. A., El Gendy H. N., Shehata G. M., Kassab A. M., Abuhagaza A. A. (2014). Mineralogical, geochemical and hydrocarbon potential of subsurface Cretaceous shales, Northern Western Desert, Egypt. Egyptian Journal of Petroleum 23, 67–78.
E. Roaldest (1978). Mineralogical and chemical changes during weathering, transportation and sedimentation in different environments with particular references to the distribution of Yttrium and lanthanide elements (Ph.D. thesis), Geol. Inst., Univ. of Oslo, Norway.
Seddique, A. A., Masuda, H., Mitamura, M., Shinoda, K., Yamanakam T., Itai, T., Maruoka, T., Uesugi, K., Ahmed K. M., Biswas, D. K. (2008). Arsenic release from biotite into a Holocene groundwater aquifer in Bangladesh. Applied Geochemistry. 23, 2236-2248.
Taylor S. R, and McLennan S. M (1985). The continental crust: its composition and evolution. Blackwell Scientific Publication, Carlton, 312 p.