Erratum to: A spatio-temporal three-dimensional conceptualization and simulation of Dera Ismail Khan alluvial aquifer in visual MODFLOW: a case study from Pakistan |
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Authors: | Qadir Anwar Ahmad Zulfiqar Khan Tahseenullah Zafar Mohammad Qadir Atwar Murata Mamoru |
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Institution: | 1.Département des Sciences du Sol, Ecole Nationale Supérieure Agronomique, ENSA-El Harrach, 16200, Alger, Algérie ;2.L.G.G.P, U.S.T.H.B, B.P. 32, Dar el Beida, 16111, Alger, Algérie ;3.Institut de Physique du Globe de Paris, 75252, Cedex 05, Paris, France ; |
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Abstract: | The Gour Oumelalen area exposes Paleoproterozoic (1.9 Ga) marbles and calc-silicate granulites. Some marbles show a specific mineralogy characterized by the presence of a highly aluminous clinopyroxene with Al2O3 content exceeding16 wt%. This clinopyroxene shows a marked zoning with a hedenbergitic core rimmed by fassaite. Phase relations are expressed by spectacular reaction textures in calc-silicate granulites as Opx + Cpx + Pl + H2O == > Grt + Qtz ± Am and Cpx + Ilm + Pl ± Mt = > Grt + Qtz + Spn. In olivine-bearing marbles, clinopyroxene and dolomite occur around olivine and calcite. According to thermodynamic modeling in the Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O–TiO2–Fe2O3 (NCFMASHTO) system, the first stage of metamorphism is located at 800 °C and 6–7 kbar, which is followed by an increase in pressure at 9–10 kbar and 800 °C and an isobaric cooling at 680 °C. The deduced anticlockwise P–T path is consistent with a granulitic metamorphism occurring in an active continental margin context. |
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