DACIAN BASIN - GeoEcoMar

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246 Chapter 12. From Brackish-Marine to Continental-Fluvial Depositional Environment FIGURE 12.1. Paratethys component sedimentary basins during the Dacian Basin existence. Simplified and modified after Khondkarian et al. (in Popov et al., 2004) 12.2. SEDIMENTARY RELATIONSHIPS BETwEEN THE DACIAN BASIN AND THE EUxINIAN BASIN 12.2.1. Facies at the boundary between Dacian and Euxinian Basins The Dacian Basin sedimentary history includes two distinct development periods. During the first one, the brackish-marine stage, which extends from the appearance of the Dacian Basin (Middle-Upper Sarmatian s.l.; approximately 11 Ma) until it dried out (starting with Middle Dacian time; approximately 4.5 Ma). A comparison of the facies features of the Dacian Basin and the adjoining Black Sea shelf is important for the knowledge of the sedimentary relationships between the Dacian and the Euxinian basins (Jipa, 2008). The investigation focused on the critical area of the limits between the Dacian and Euxinian basins. This area, situated northward of the Dobrogean High and the contact between the north-eastern part of the Dacian Basin trough and the western Black Sea Depression shelf, is known as the Galaţi seaway (Saulea et al., 1969). During the Late Miocene (approximately 11 to 4.5 Ma) both Dacian and Euxinian basins represented brackish-marine water bodies, with common fauna, suggesting faunal interchanges. At their contact area the two basins were morphologically very different. The Dacian Basin appeared as a shallow but subsiding sedimentary trough, which received a high amount of Carpathian-derived sediment, and accumulated it with a high sedimentation rate. At the contact with the Dacian Basin, the Euxinian western shelf was characterized by reduced detrital accumulation, with its dominance of shell fragments and very fine-grained clastics. The lithofacies and sedimentation rate differentiation between the Dacian and the western Euxinian areas persisted during the Late Miocene time.
12.2. Sedimentary relationships between the Dacian Basin and the Euxinian Basin FIGURE 12.2. Paleogeographic sketches showing the comparative areal evolution of the Dacian Basin and the neighbouring Paratethys basins. Compiled from Saulea et al. (1969), Papaianopol et al. (1987), Hammor et al. (1988), Magyar et al. (1999) and Popov et al. (2004). The Carpathians and the Balkans are shown in the present-day setting as markers of the areal evolution 247
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Dan C. Jipa, Cornel Olariu DACIAN B
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Dedicated to the memory of Prof. Gh
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NATIONAL INSTITUTE OF MARINE GEOLOG
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CONTENTS Foreword and Acknowledgeme
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Contents Chapter 7. The Point Bar F
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FOREwORD AND ACkNOwLEDgEMENTS The s
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PLATE 1. Location of the Dacian Bas
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18 Chapter 1. Dacian Basin. General
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The analysis of the paleogeographic
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42 Chapter 2. Dacian Basin paleogeo
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58 FIGURE 2.14. Paleogeography and
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68 Chapter 3. Sediment Thickness Di
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Sedimentation in the brackish-water
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84 Chapter 4. Dacian Basin Physiogr
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94 Chapter 5. Littoral Sedimentary
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Fluvial sedimentation played a majo
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136 Chapter 6. Upper Neogene Fluvia
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The large and continuous rock expos
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158 Chapter 7. The Point Bar Facies
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190 Chapter 8. The Paleoenvironment
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Page 202 and 203: 200 Chapter 9. Source-Areas in the
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DACIAN BASIN - GeoEcoMar

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