DACIAN BASIN - GeoEcoMar

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192 Chapter 8. The Paleoenvironmental Significance of Clay in the Dacian Basin FIGURE 8.3. Types of clay and the associated sandy sedimentary units. A - Stratified clay in a littoral sequence with a coarsening upward bed and thin silty and sandy intercalations with wave ripples. Late Neogene, Bizdidel River, Pucioasa (Dâmboviţa County). B - Non-stratified clay in a fluvial sequence with fining upwards sandy units. Romanian, Dumitreşti (Vrancea County) ■ fluvial crevasse splay environment; this is the interpretation applied to the coarsening upward sedimentary units intercalated in fluvial deposits (characteristically with fining upward trend). The homogeneous clay is associated with fluvial sequences. Taking into consideration that the homogeneous clay belongs to the fining upward sequence, we may conclude that some of this type of clay accumulate in the fluvial channel environments. Since this is an extremely fine sediment accumulation and without current structures, the homogeneous clay could represent the moment when flu-
8.3. Sediment accumulation paleoenvironment and the clay facies vial channels were abandoned by avulsion and the clogging of the abandoned channels was in progress. The marsh is also a site where the homogeneous clay accumulated. Another feature underlining the fluvial affiliation of the non-bedded clay is represented by the presence of soil fossil aspects. Some homogeneous clay display calcareous concretions (Fig. 8.5), either randomly distributed or aligned to evidence the bedding surface. Dark colored intervals, believed to be rich in organic matter, occur in some fluvial, flood plain sediments (Fig. 8.5 E). FIGURE 8.4. Stratified clay in a fluvial sequence. The bedded clay deposits are part of the crevasse splay units. See also Figure 6.19. Bizdidel River, Pucioasa (Dâmboviţa County) 193
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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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Page 144 and 145: 142 Chapter 6. Upper Neogene Fluvia
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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
Page 232 and 233: 230 Chapter 11. From Brackish-Marin
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242 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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