// +author:e akon +author:akon 
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{userid:"sharif.khan", "refid":"15","repocollections":"","attachment":"","_thumb":"","articletype":"article","sectionheading":"","title":"Petrographic study of some core samples from Precambrian Basement, Maddhapara, Dinajpur district, Bangladesh.","year":"1997","author":"Khan, M. S. H., Ameen, S. M. M. and Akon, E.","journal":"Bangladesh Journal of Geology","volume":"16","number":"","pages":"55-64","month":"","doi":"","pubmed":"","pdflink":"","urllink":"","abstract":"Petrographical investigations of some core samples encountered between depths of 182.5 m and 272.4 m of drill hole BH-2 Maddhapara, Dinajpur district have been carried out. Tonalites are the most extensively developed litho-units occupying almost the entire length of the drill hole. Gneiss, granite and hornblende-biotite schist are the smaller litho-units encountered in the hole. Tonalites are hypidiomorphic, medium to coarse grained, inequigranular rocks, composed of chiefly plagioclase, quartz, hornblende, k-feldspar and biotite. Myrmekitic intergrowths,sericitization of feldspar and chloritization of biotites and hornblendes present in the tonalities are conspicuous. Gneiss is medium grained rock having mineral assemblage similar to tonalities. Granite is very coarse grained and composed mainly of quartz, k-feldspar and plagioclase. Very coarse grained hornblende-biotite schist is the only mafic rock present in the drill hole. Petrographic study suggests that the tonalities were formed through the fractionation of a single primary basaltic magma. Significant mafic phase: hornblende, biotite, presence of sphene and magnetites in granitic rocks of the area supports that the tonalities belong to I-type granitoid pluton which originated from the lowest crust or upper mantle.","note":"","tags":""}
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{userid:"sharif.khan", "refid":"14","repocollections":"","attachment":"","_thumb":"","articletype":"article","sectionheading":"","title":"Petrography and major oxide chemistry of some Precambrian Crystalline rocks from Maddhapara, Dinajpur.","year":"1998","author":"Ameen, S. M. M., Khan, M. S. H., Akon, E., and Kazi, A. I.","journal":"Bangladesh Geoscience Journal","volume":"4","number":"","pages":"1-19","month":"","doi":"","pubmed":"","pdflink":"","urllink":"","abstract":"Petrographical and petrochemical studies on some Precambrian core samples encountered between the depth of 182.5 m and 272.4 m of drillhole BH-2, Maddhapara, Dinajpur, have been carried out for their precise classification to elucidate their petrogenesis. The major lithotype occupying the drillhole is tonalite. Other minor lithotypes are gneiss, adamellite granite and hornblende-biotite schist. Medium to coarse grained tonalities are leucocratic to mesocratic and hypidiomorphic rocks, mainly composed of quartz, plagioclase and hornblende with considerable amount of biotite and k-feldspar. Sericitization of plagioclase and chloritization of hornblende and biotite are observed.The average K2O\/Na2O composition of Maddhapara tonalities is comparable with the older Archean granitoids of tonalitic composition of southern India. Mineralogical and chemical characteristics of the gneiss support tonalitic precursor for the gneiss. Both adamellite granite and hornblende-biotite schist are of very coarse grained rock and the latter shows schistose as well as granulitic texture. Mineralogy and chemistry of hornblende-biotite schist characterized by lower SiO2 and higher CaO, MgO and Fe2O3 (t) indicate predominantly a basic source for this rock. With regard to the evolution of the lithotypes encountered in the drillholes, it is evident that in the earlier magmatic episode huge tonalitic terrain came into being from the fractionation of a single primary basaltic magma. Gneiss appears to be the product of partial metamorphism of tonalities. The granite and schist within the tonalites seem to have been formed from later intrusion through crustal fractures, which might possibly be related with the later tectonic activities. From the characteristic mafic phase and chemical data, especially, alkali and CaO content, it is evident that the tonalites belong to I-type granitoid pluton, which originated from the lowest crust or the upper mantle source. The traces of uranium in the gneiss suggest further investigation on its potentiality.  ","note":"","tags":""}
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{userid:"sharif.khan", "refid":3,"repocollections":"","attachment":"","_thumb":"","articletype":"article","sectionheading":"","title":"Paleoproterozoic granitoids in the basement of Bangladesh: A piece of the Indian shield or an exotic fragment of the Gondwana jigsaw?","year":"2007","author":"Ameen, S. M. M., Wilde, S. A., Kabir, Z. M., Akon, E., Chowdhury, K. R. and Khan, M. S. H.","journal":"Gondwana Research","volume":"12","number":"","pages":"380-387","month":"","doi":"","pubmed":"","pdflink":"","urllink":"","abstract":"We present the first precise age for Precambrian basement rocks in Bangladesh. These lie within the Dinajpur block, located between the Indian Craton to the southwest and the Shillong Massif to the east. There are no surface outcrops and the rocks were intersected by drill holes. They consist of a suite of tonalitic and granodioritic rocks, variously deformed to granitic gneiss and intruded by younger monzogranite. A tonalite obtained at a depth of 227.48 m in drill hole BH-2 at Maddhapara, in northwestern Bangladesh, records a SHRIMP zircon 207Pb\/206Pb magmatic age of 1722 \u00b1 6 Ma. Paleoproterozoic rocks with similar magmatic ages are unknown in the adjacent Indian blocks of the Chotanagpur Plateau (Indian Craton) or Shillong Massif. This lack of comparable ages may be due to the paucity of precise radiometric ages from the Indian terrains or, more likely, because there are real age differences, with the buried rocks at Maddhapara representing a separate and discrete microcontinental fragment (the Dinajpur block) that was trapped by the northward migration of India during Gondwana dispersal.","note":"","tags":"Paleoproterozoic rocks; SHRIMP U\u2013Pb dating; Dinajpur block; Bangladesh"}
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