DACIAN BASIN - GeoEcoMar

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234 Chapter 11. From Brackish-Marine to Continental-Fluvial Depositional Environment FIGURE 11.5. The Early Dacian unit (a) is visible in the sedimentary column being placed between a dominantly clayey Pontian succession (b) and an alternating sand-clay fluvial sequence (c) The Dacian-aged coarsening upward sedimentary interval overlies muddy, low salinity upper Pontian deposits and is followed by a very thick upper Dacian-Romanian fluvial unit (sandy beds intercalated within the muddy deposits). The distinct facies of the three stratigraphic entities is the factor that singles out the lower Dacian unit investigated in this paper. In the sub-Carpathian area of the Dacian Basin coarsening upward units occur in the Early Dacian but also in the Late Pontian stratigraphic interval, due to the proximal character of the area. Only the Early Dacian coarsening upward bodies extend in the distal area of the basin (Fig. 11.2). 11.1.4. The thickness of the Early Dacian coarsening upward unit During this study, Dacian coarsening upward units were recognized in many wells drilled in the Dacian Basin area. The thickness of this unit was measured only on
11.1. Late Pontian-Romanian regressive unit 73 well logs, where it was possible to indicate confidently the boundaries of the coarsening upward interval. The thickness values of the coarsening upward unit are in the range of 50- 80 m, but the thicknesses between 60-70 m are the most frequent (Fig. 11.6). The lowest thickness measured on the well logs is 23 m. The maximum determined thickness is 85 m. FIGURE 11.6. Thickness values of the Early Dacian coarsening upward sedimentary sequence. The graph of the frequency distribution is based on 73 borehole thickness measurements 11.1.5. Areal extent of the Dacian coarsening upward unit About one hundred Dacian Basin well logs were used to map the extent area of the Early Dacian coarsening upward units. The presence of the coarsening upward unit was noticed in almost the whole area covered by the Dacian Basin (Fig. 11.8). The north-eastern part of the basin is the region where the coarsening upward unit was not identified (Fig. 11.8 d). The coarsening upward unit was distinguished in the northern, outcrop belt, in the central region and in the southern part of the Dacian Basin. On the Jiu-Olt transect (Fig. 11.7), the coarsening upward unit appears from the northern part of the Dacian Basin to its southern edge. Even within the area where the Dacian-dated coarsening upward unit was mapped, this sedimentary unit may be locally absent. However, the well logs with- 235
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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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Page 186 and 187: 184 Chapter 7. The Point Bar Facies
Page 192 and 193: 190 Chapter 8. The Paleoenvironment
Page 200 and 201: The evolution and architecture of a
Page 202 and 203: 200 Chapter 9. Source-Areas in the
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Page 216 and 217: 214 Chapter 10. History of the Daci
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Page 260 and 261: 258 References hA m o r, g., et al.
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Page 264 and 265: 262 References ră d A n, s.C., 200
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DACIAN BASIN - GeoEcoMar

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