DACIAN BASIN - GeoEcoMar

More documents

Recommendations

Info

224 Chapter 10. History of the Dacian Basin Sediment Accumulation FIGURE 10.9. Tentative representation of the Dacian Basin sediment transport system. 1. Carpathian fluvial network (conceptual image). 2. Paleocurrents in the littoral/sublittoral zone. 3. Paleocurrents in the Dacian Basin trough. 4. Area with large scale Maeotian-Pontian progradation structures. 5. Southeastern Dacian Basin shelf. 6. Zone with intermediary water depth between shelf and trough (including the sub-Carpathian littoral zone). 7. Axial zone of the Dacian Basin trough. Upper-left: paleocurrent measurement data 10.3. STAgES OF THE <strong>DACIAN</strong> <strong>BASIN</strong> SEDIMENT FILLINg The evolution of the two depocenters offers the best information on the Dacian Basin sediment filling process. Three stages have been distinguished in the evolution of the sediment filling process.
10.4. Control factors of the sediment filling process Stage 1. Brackish sediment accumulation restricted to two separated depocenters. This stage extends through the Middle-Late Sarmatian (s. l.) – Maeotian time interval. The main distinctive character of the stage 1 is the sediment accumulation within two distinct Dacian Basin depocenters (Fig. 10.10 A and B). The areas of the individual depocenters enlarged considerably during the Maeotian, as compared to the Middle-Late Sarmatian (s. l.) extent. During the Maeotian time interval the eastern depocenter extended mostly toward the south-west with a fan-like geometry (Fig. 10.10 B). The western depocenter enlarged eastward and southward, and the maximal sediment thickness increased from 200 m during Middle-Late Sarmatian (s. l.) to 600 m in the Maeotian time (Fig. 10.10 B). In the space between the two depocenters a reduced amount of sediments accumulated, with around 100 m thickness. Stage 2. Brackish sediment filling, mainly through the extension of the eastern depocenter. This stage covers the time span from the Early Pontian to the Early Dacian. The characteristic of the sediment filling process during the stage 2 is the westward advance of the sediment accumulation along the sedimentary trench (Fig. 10.10 C and D). The main effect of this process was the filling of the accommodation space of the former sediment deficient area between the two depocenters. In the western depocenter, the southward extension of the sediment accumulation area continued, reaching its maximum during the Early Pontian (Fig. 10.10 C). The Late Pontian-Dacian isopach map (Saulea et al., 1969) shows the end of this process and the decrease of the sediment accumulation in the western depocenter of the Dacian Basin (Fig. 10.10 D). The two depocenters coalesced into a single depocenter sometimes between Late Pontian and Early Dacian. The stage 2 ends with the filling out and closure of the brackish-marine Dacian Basin. Stage 3. Fluvial sediment accumulation subsequent to the filling out of the Dacian Basin. Starting from the Middle Dacian time, the sedimentation in the area of the Dacian Basin is fluvial. The isopach map indicates a single area, with an east–west elongated sediment accumulation front (Fig. 10.10 E). The large scale geometry of the sediment accumulation, belonging to the piedmont type, indicates an exclusively Carpathian sediment supply. In contrast with the preceding sediment filling stage, the sediment accumulation tends to extend southward. 10.4. CONTROL FACTORS OF THE SEDIMENT FILLINg PROCESS The history of the sediment filling in the Dacian Basin was strongly influenced by the tectonic factor. Being a foreland unit, the Dacian Basin physiography have been shaped mainly by the tectonic forces. The Dacian Basin elongation (a typical fore- 225
Page 1:
Dan C. Jipa, Cornel Olariu DACIAN B
Page 5:
Dedicated to the memory of Prof. Gh
Page 8 and 9:
NATIONAL INSTITUTE OF MARINE GEOLOG
Page 11 and 12:
CONTENTS Foreword and Acknowledgeme
Page 13 and 14:
Contents Chapter 7. The Point Bar F
Page 15 and 16:
FOREwORD AND ACkNOwLEDgEMENTS The s
Page 17:
PLATE 1. Location of the Dacian Bas
Page 20 and 21:
18 Chapter 1. Dacian Basin. General
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
The analysis of the paleogeographic
Page 44 and 45:
42 Chapter 2. Dacian Basin paleogeo
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
58 FIGURE 2.14. Paleogeography and
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
68 Chapter 3. Sediment Thickness Di
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Sedimentation in the brackish-water
Page 86 and 87:
84 Chapter 4. Dacian Basin Physiogr
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
94 Chapter 5. Littoral Sedimentary
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Fluvial sedimentation played a majo
Page 138 and 139:
136 Chapter 6. Upper Neogene Fluvia
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
The large and continuous rock expos
Page 160 and 161:
158 Chapter 7. The Point Bar Facies
Page 162 and 163:
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
Page 174 and 175:
Page 176 and 177: 174 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
Page 214 and 215: 10.1. SEDIMENT ACCUMULATION AREAS I
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
Page 260 and 261: 258 References hA m o r, g., et al.
Page 262 and 263: 260 References mA C A r o V iC i, n
Page 264 and 265: 262 References ră d A n, s.C., 200
Page 266: 264 References VAsilieV, i., Kr iJ
show all

DACIAN BASIN - GeoEcoMar

Create successful ePaper yourself

Delete template?

Save as template?