DACIAN BASIN - GeoEcoMar

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254 Chapter 12. From Brackish-Marine to Continental-Fluvial Depositional Environment extensive coal-generating marshes. This process took about 700.000 years, from the Early to the Late Dacian time (approximately from 4,8/4,7Ma to 4,1/3,9 Ma). 12.3.3. On the sedimentary pattern of the Dacian and Pannonian basins The dominant sedimentary process which shaped the Pannonian Basin architecture was the delta progradation, generated and maintained by a strong fluvial supply of detrital material (Juhász et al., 2007). The size reduction of the Pannonian Basin resulted from the advancement of the frontal part of the fluvio-deltaic system, under pressure from the high rate of the sediment supply. The Dacian Basin sediment filling evolved without significant changes of the basin size. The sediment entering the northern part of the basin was transferred along the trench axis. This action did not build large scale inclined bedded structure (clinoforms) as in the Pannonian Basin, which means that the sediment transfer was not made through deltaic-type frontal progradation in deep water, but by extended superposed sediment sheets. A notable exception is the progradation structure from the deeper, western end of the Dacian Basin (Tărăpoancă, 2004; Leveer, 2007) (Fig. 4.6). This architectural feature was built at the end of the longitudinal route of the transported sediment, probably induced by the steeper bottom slope of the deeper western area. Except for the large scale Maeotian-Pontian clinoform structure in the western end of the basin, no large-scale progradation was evidenced in the brackish Dacian Basin. This is in contrast to the dominant progradation aspect of the Pannonian Basin sediment filling. In the Pannonian Basin the transition from the brackish to the fresh-water environment was gradual, and the sedimentation has become lacustrine. The Dacian Basin passed to the fresh-water environment rather abruptly, following the migration of the shoreline, which swept the entire basin (see Chapter 11.2). The fresh-water sedimentary environment appeared as a very extensive, multiple fluvial plain, which included large coal-generating marshes. 12.3.4. Similarity and difference in the sedimentary evolution of the Dacian and Pannonian basins To conclude this short analysis of the comparative sedimentary evolution of the Dacian and Pannonian basins, let us underline the main similarities and differences between the two Paratethys units. The similar aspects of the parallel Dacian – Pannonian basins evolution refer to the initial and final moments of their sedimentary history. The time of basin separation of the Pannonian and Dacian basins is relatively close. Even closer is the time of passing from brackish to fresh-water environment, that is about 4.5 Ma for the
12.3. Comparative sedimentary evolution of the Dacian Basin and the Pannonian Basin Pannonian Basin (Magyar et al., 1999) and 4,8/4,7Ma to 4,1/3,9 Ma for the Dacian Basin. The long time areal changes represent a striking difference between the Dacian and Pannonian basins. The Pannonian Basin decreased from a large brackish-water body to the small fresh-water Slovanian lake, a change that took about five million years (Magyar et al., 1999). In contrast, during the seven million year sedimentary evolution, the Dacian Basin size stayed roughly constant. The difference in the changes affecting the basin size is a result of important sediment filling mechanism of the two basins. The Pannonian Basin was filled out mainly by lateral sedimentation. The only lateral sedimentation documented feature of the Dacian Basin is at its western end. 255
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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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The evolution and architecture of a
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200 Chapter 9. Source-Areas in the
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202 Chapter 9. Source-Areas in the
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DACIAN BASIN - GeoEcoMar

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