x
J
L
E
S
PETROLOGY OF THE METAMORPHIC ROCKS (GRAVELS) FROM BHAJANPUR AREA IN PANCHAGARH DISTRICT, BANGLADESH
By: Md. Rahat Hossain, Ismail Hossain*, A.S.M. Zahid Hossain and Prodip Kumar Biswas1
Key Words: Petrology, metamorphic rocks, gravels, P–T conditions, Panchagarh, lesser Himalayan sequence
JLES-Vol-5-No-P-91-96, December 2010
AbstractThe present study deals with petrology of the detrital gravelly rocks from Bhajanpur area, Panchagarh, Bangladesh. The results of detailed petrography of gravelly rocks indicate the presence of quartz (monocrystalline and polycrystalline quartz), K-feldspar, plagioclase, chlorite, muscovite and biotite as major mineralogical compositions. Other minor minerals are garnet, kyanite, graphite and opaque minerals. Based on definitive mineral assemblages, blueschist and greenschist facies sequences are recognized. Correspondingly, index minerals provide chlorite zone, biotite zone, garnet zone, kyanite zone, and graphite zone. The P–T conditions of the studied rocks demonstrate the possible temperature ranges 300–550oC and pressure ranges 2–10 kbar. Most common varieties of metamorphic rocks in the study area are garnet mica schist, chlorite schist, gneiss and few quartzites. Characteristics of garnet mica schist and chlorite schist are equivalent with the lesser Himalayan metamorphic rock sequence in Sikkim area, whereas gneiss from Bhajanpur area has similar precursor as Darjeeling gneiss. Therefore, the sources of detrital metamorphic rocks in Bhajanpur area obviously come from the lesser Himalayan sequence in Sikkim and Darjeeling areas, India.
Alam MS. 1992. Trends in grain-size measure and mineralogical analysis of Mahananda and Karatoya river sands of Tetulia Bhajanpur area, Panchagarh Bangladesh. Unpubl M.Sc. Thesis, Department of Geology and Mining, University of Rajshahi. 167pp.
Bakhtine MI. 1966. A speculative tectonic history of Pakistan and surroundings, Some constraints from the Indian Ocean: Geodynamics of Pakistan, pp. 5-24.
Burke K, Dewey JF. 1973. Plume-generated triple junctions: Key indicators in applying plate tectonics to old rocks. J Geol 81, 406–433.
Daniel CG, Hollister LS, Parrish RR, Grujic D. 2003. Exhumation of the Main Central Thrust from Lower Crustal Depths, Eastern Bhutan Himalaya. J Meta Geol 21, 317-334.
Ganguly J, Dasgupta S, Cheng W, Neogi S. 2000. Exhumation history of a section of the Sikkim Himalaya, India: records in the metamorphic mineral equilibria and compositional zoning of garnet. Earth Planet Sci Let 183, 471-486.
Gansser A. 1964. Geology of Himalayas (De Sitter LU ed) Interscience Publishers, John Wiley & Sons Ltd, London, 289 pp.
Goscombe BD, Hand M. 2000. Contrasting P–T paths in the Eastern Himalaya, Nepal: inverted isograds in a Paired Metamorphic Mountain Belt. J Petrol 41, 1673-1719.
Goscombe B, Gray D, Hand M. 2006. Crustal architecture of the Himalayan metamorphic front in eastern Nepal. Gond Res 10, 232-255.
Guha DK. 1978. Tectonic framework of oil and gas prospect of Bangladesh. Proc. 4th Annual Conf. Bangladesh Geological Soc. Dhaka pp. 65–74
Khan AA, Rahman T. 1992. An analysis of the gravity field and tectonic evaluation of north western part of Bangladesh. Tectonophys 206, 301-655.
Khan FH. 1991. Geology of Bangladesh. Wiley Eastern Ltd, New Delhi, India. 204 pp.
Khan SI, Williams VS, Das SK, Hassan KZ. 1990. Geology of Panchagarh District, Rajshahi Division, Bangladesh. Records of the Geological Survey of Bangladesh, Dhaka, Vol. 6(2).
Krisnan MS. 1982. Geology of India and Burma. CBS Publishers & Distributors, India. 536 pp.
Miyashiro A. 1994. Metamorphic Petrology. UCL Press Ltd, University College London, Gower Street, London. 331pp.
Monsur MH. 1994. Some geological and economical aspects of the gravel deposits exposed in Dahagram-Panchagarh areas. Bengal Delta 1: 8-9.
Morgan JP, Mclntire WG. 1959. Quaternary Geology of Bangle Basin, East Pakistan and India. Geol. Soc. Am. Bull. 70: 319-342.
Mukhopadhay D. 1986. Structural pattern in the Dharwar craton. J. Geol. 98: 167-186.
Neogi S, Dasgupta S, Fukuoka M. 1998. High-P–T polymetamorphism, dehydration melting, and generation of migmatites and granites in the Higher Himalayan Crystalline Complex, Sikkim, India. J. Petrol. 39: 61–99.
Rahman MA, Alam MS, Islam MA. 2004. Lithostratigraphy and Alluviation History of the Quaternary Deposits in Panchagarh Districts, Northwestern part of Bangladesh. Geosci. J. 10: 13-25.
Rahman MA, Alam MS and Shine FMM. 2005. Roundness and sphericity of clastic sediments of apical part of the Tista Fan in Panchagarh Districts, Bangladesh. Rajshahi Univ. Studies Part B. J. Sci. 33: 153-163.
Reimann KU. 1993. Geology of Bangladesh. Gerbruder Bornt Ramerg, Berlin, Germany. 160 pp.
Sengupta S. 1966. Geological and geophysical studies in the Western part of the Bengal Basin, India. Am. Soc. Geol. Bull. 50(5): 1001-1017.
Spear FS. 1999. Real-time AFM diagrams on your Macintosh.
Geol. Mater. Res. 1: 1-18.
Spear FS and Cheney JT. 1989. A petrogenetic grid for pelitic schists in the system SiO2-Al2O3-FeO-MgO-K2O-H2O. Contrib. Mineral Petrol. 101: 149-164.
Yardley BWD. 1989. An Introduction to Metamorphic Petrology. Longman, Harlow. 248 pp.
Manuscript received on 26 October 2010 and revised on 20 January 2011
Md. Rahat Hossain, Ismail Hossain*, A.S.M. Zahid Hossain and Prodip Kumar Biswas1
PETROLOGY OF THE METAMORPHIC ROCKS (GRAVELS) FROM BHAJANPUR AREA IN PANCHAGARH DISTRICT, BANGLADESH
JLES-Vol-5-No-P-91-96, December 2010
https://jlescience.com/les-publish/petrology-of-the-metamorphic-rocks-gravels-from-bhajanpur-area-in-panchagarh-district-bangladesh/Copyright © 2022
By Authors and Journal of Life and Earth Science (JLES)
https://jlescience.com