DACIAN BASIN - GeoEcoMar

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208 Chapter 9. Source-Areas in the Geological History of the Dacian Basin FIGURE 9.8. Main interpreted trends of the Middle - Late Sarmatian (s. l.) to Dacian palaeocurrent systems, in the sub-Carpathian side of the Dacian Basin The paleocurrent measurements show that all sediments accumulated on the sub-Carpathian side of the Dacian Basin are derived from the Carpathian area. This is a direct evidence confirming the significant part played by the Carpathians as a source-area of the Dacian Basin. The paleocurrent data cannot differentiate the two major depocenters of the Dacian Basin. 9.6. SEDIMENT SOURCE-AREAS DURINg THE <strong>DACIAN</strong> <strong>BASIN</strong> EvOLUTION The source-area system. The provenance analysis of the Dacian Basin detrital material revealed the existence of four source-areas (Fig. 9.9). The Carpathians represented the most important source. The Carpathian clastic material was supplied independently from two areas: the southern part of the Eastern Carpathians and the western part of the Southern Carpathians. The bulk of the Dacian Basin material is of Carpathian origin. Two source-areas supplied clastic particles from the southern side of the Dacian Basin: the Balkanian and the Dobrogean source-areas. As the Balkans were relatively far from the Dacian Basin, only a small volume of detrital material from Balkanians entered the Dacian Basin. Dobrogea was a highland area with a reduced surface and, probably not very high relief. The amount of clastic material supplied to the Dacian Basin from the Dobrogean source-area was small. Due to the low amount of the
9.6. Sediment source-areas during the Dacian Basin evolution southern clastic supply the isopach maps, with contour line interval of 100 m, do not show separate southern depocenters of the Balkanian and Dobrogean source-areas. Middle-Late Sarmatian (s. l.) source-areas. Only Saulea et al. (1969) made a Dacian Basin litho-paleogeographic map for the Middle-Late Sarmatian (s. l.) time interval. The lithology (Fig. 2.5) and the isopachs (Fig. 9.3 A) shown on this map suggest that the Eastern Carpathians were the only important acting source-area. The western South Carpathians area represents, probably, the sediment source for the western Dacian Basin depocenter. Maeotian source-areas. The isopach map (Fig. 9.3 B) offers unambiguous evidence for the large sediment supply which came from the eastern and western Carpathian source-areas. The isopach and lithologic map pattern does not indicate the Balkanian as a source-area during the Maeotian time. Dobrogean sediment supply is suggested by some lithologic data (Fig. 9.4 A). On the isopach map (Fig. 9.3 B) the contours indicate a small sediment accumulation in front of the Dobrogean dry-land, which is backing the lithologic indication. FIGURE 9.9. The sediment source-areas system of the Dacian Basin. The size of the arrows suggests the importance of the volume of sediment supplied by the source areas. A. Eastern Carpathians source-area. B. Southern Carpathians source-area. C. Balkanian source-area. D. Dobrogean source-area 209
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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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Page 192 and 193: 190 Chapter 8. The Paleoenvironment
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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
Page 232 and 233: 230 Chapter 11. From Brackish-Marin
Page 258 and 259: 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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