DACIAN BASIN - GeoEcoMar

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170 Chapter 7. The Point Bar Facies in the Jilţ Quarry (Romanian Deposits) The sequence with large scale cross stratification develops above an erosional basal limit, marked by a thin sheet of fine gravel, the basal lag (Fig. 7.10 F). A flood plain silty - sandy interval occurs under the point bar unit, separating the point bar from the underlying lignite bed VII (Fig. 7.15). The upper limit of the Jilţ South sequence is normal, depositional, marked by the base of a minor coal episode. Another flood plain clayey deposit occurs above the point bar (Fig. 7.15), between the thin lignite bed and the lignite bed VIII. 7.2.5. geometry of the facies units The sandy deposits cropping out in the Jilţ Quarry belong to two types of fluvial accumulation. In the western part of the studied area, the point bar deposits overlie coarse and very coarse-grained sand (Fig. 7.16 A), with large cross lamination structures (Fig. 7.16). These deposits do not show mud drapes intercalations. Occasional inclined clay pebble units (Fig. 7.10) point out the sedimentation of the coarse and very coarse-grained sand facies into an environment of lateral accretion, probably close to the channel talweg. Three thin sheets of fine-grained gravel divide the sandy accumulations into three units (Fig. 7.16). The first two units are in the coarse sandy sediments without inclined stratification. The entire sand succession is bounded by flood plain sediments (Figs. 7.15; 7.16A). In the transversal cross section resulted from the mining work in the Jilţ South Quarry, the facies characteristics and geometric relationships are dominated by the existence of a large lens-shaped accumulation of coarse sand (up to 12 m thick) in the central part of the cross section (Fig. 7.16 B). Pinching out of the coarse sand facies is compensated by the increasing thickness of the fine and very fine sand facies. Consequently, the general shape of the inclined stratification Jilţ body is approximately tabular in the eastern part of the section. Westward from the central coarse sand lens, the very fine grained sand subfacies and the silty-clayey upper facies are getting thicker (Fig. 7.16 B). In the westernmost part, the very fine grained sand sub-facies gradually pinch out above an inclined surface (probably, the channel margin) made up by the coarse-grained sediments without inclined stratification. 7.2.6. Pattern of the inclined stratification The thin clayey interbeds (mud drapes) indicate the internal inclined sedimentary surfaces within the Jilţ sand body (Figs. 7.18; 7.19; 7.20). The clayey intercalations (lateral accretion surfaces) have a common eastward dip direction, but their variable dipping value and extension differentiate several sets of inclined stratification sediments (Fig. 7.21).
7.2. The sedimentological description of the Jilţ point bar deposits FIGURE 7.15. Synthetic litho-facial column of the deposits cropping out on the walls of the mining fronts E12 and E13. Jilţ South Quarry 171
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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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Page 122 and 123: 120 Chapter 5. Littoral Sedimentary
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Page 158 and 159: The large and continuous rock expos
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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
Page 214 and 215: 10.1. SEDIMENT ACCUMULATION AREAS I
Page 216 and 217: 214 Chapter 10. History of the Daci
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220 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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