DACIAN BASIN - GeoEcoMar

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84 Chapter 4. Dacian Basin Physiography The simultaneous length and width changes experienced by the Dacian Basin during the brackish-marine development produced a change of its geometric areal configuration. The elongation of the Dacian Basin, expressed by a width/length ratio of 1/9.4 during the Middle Sarmatian (s.l.), was altered to a width/length ratio amounting to 1/4.8 - 1/5.7 during the Pontian-Dacian stage (Fig. 4.2). FIGURE 4.2. Evolution of the Dacian Basin geometry, expressed by comparing the shape parameters. Paleogeographic sketches based on Saulea et al. (1969). A, B, C - transects for the basin width measurement
4.2. Dacian Basin shelf and trough Presently, we have no data concerning the transversal shape of the Dacian Basin. The large-scale concave form of the Dacian Basin basal section should be another tectonically inflicted geometric feature of the basin, as a direct effect of the lithosphere depression and flexure. The trench pattern of the Dacian Basin is also suggested by the dominant longitudinal trend of the paleocurrents (see Chapter 10.2). Paleocurrent trends, being characteristics of foreland basins, are imposed by their elongated – trench like – shape. As a result of its location adjacent to the Carpathians, costal relief of the Dacian Basin is asymmetric. On the internal, mountain facing side, the coastal zone of the Dacian Basin had a higher relief. The external, southern and eastern sides of the basin were a low relief coast. 4.2. <strong>DACIAN</strong> <strong>BASIN</strong> SHELF AND TROUgH The isopach maps drawn for several successive time slices point out the development of a southern zone with very thin sediments (Fig. 2.12; marked as Sh in figure 4.3) during the Pontian and Dacian. In opposition, on the internal, sub-Carpathian side of the Dacian Basin, there are always thick deposits. FIGURE 4.3. Sediment thickness distribution during the Dacian Basin evolution. The southern area (Sh) with very thin (and fine grained) sediments became evident during the Pontian and Dacian time. This area is interpreted as the shelf zone of the Dacian Basin. Isopach maps from Saulea et al. (1969). Sediment thickness in meters 85
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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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Page 36 and 37: 34 Chapter 1. Dacian Basin. General
Page 42 and 43: The analysis of the paleogeographic
Page 44 and 45: 42 Chapter 2. Dacian Basin paleogeo
Page 60 and 61: 58 FIGURE 2.14. Paleogeography and
Page 70 and 71: 68 Chapter 3. Sediment Thickness Di
Page 84 and 85: Sedimentation in the brackish-water
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Page 96 and 97: 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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10.1. SEDIMENT ACCUMULATION AREAS I
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214 Chapter 10. History of the Daci
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230 Chapter 11. From Brackish-Marin
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Ai n s w o r t h r. B., Cr o w l e
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258 References hA m o r, g., et al.
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260 References mA C A r o V iC i, n
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262 References ră d A n, s.C., 200
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264 References VAsilieV, i., Kr iJ
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DACIAN BASIN - GeoEcoMar

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