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Johannes Stets; Andreas Schäfer:

Depositional Environments in the Lower Devonian Siliciclastics of the Rhenohercynian Basin (Rheinisches Schiefergebirge, W-Germany)

Case Studies and a Model

2002. IV, 78 pages, 35 figures, 3 tables, 21x29cm, 350 g
Language: English

(Contributions to Sedimentary Geology, Volume 22)

ISBN 978-3-510-57022-5, paperback, price: 38.00 €

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Keywords

Lower Devonian Siliciclastics Rhenohercynian Basin Germany geology stratigraphy Rheinisches Schiefergebirge

Contents

Content Description top ↑

The main targets of this paper are analysis, interpretation, and reconstruction of the depositional palaeoenvironments of th Lower Devonian siliciclastics within the Rhenohercynian Basin. For this purpose, columnar sections and data of large outcrops have been collected along the Rhine transect between Bonn and Bingen. The rock sequences, some of them more than 150 m in thickness, have been analyzed as individual case studies. Understanding and interpretation of the depositional palaeoenvironments are supported by regional geologic data, lithology, primary depositional features, and biologic remains. The vertical evolution of the sedimentary sequences in the columnar sections favoured the understanding of the Rhenohercynian basin fill.

Contents top ↑

Abstract IV
1. Introduction 1
2. Geological setting 2
3. Subdivision of the Lower Devonian
Rhenohercynian Basin 4
4. Stratigraphic framework 6
5. Sedimentological data 8
6. Rocks, grain size range, and bedforms 9
7. Sedimentary environments 11
7.1 The Northern Facies belt 11
7.1.1 Fluvial environments 13
7.1.2 Deltaic environments 19
7.1.3 Interdistributary bay 21
7.1.4 Tidal environment 24
7.1.5 Fauna and flora 32
7.1.6 Concluding remarks 34
7.2 The Central Facies belt 35
7.2.1 Prodelta environment 35
7.2.2 Basinal environment 37
7.2.3 Tidal environment 38
7.2.4 Shoreface environment 41
7.2.5 Fauna and flora 43
7.2.5.1 Hunsrückschiefer basinal environment 43
7.2.5.2 Shallow sea to deltaic environment 45
7.2.6 Concluding remarks 45
7.3 The Southern Facies belt 45
7.3.1 Fluvial environment 46
7.3.2 Coastal to nearshore environment 47
7.3.3 Shallow sea siliciclastic environment 49
7.3.4 Outer offshore environment 53
7.3.5 Fauna and flora 53
7.3.6 Concluding remarks 55
8. Depositional model of the Rhenohercynian
Basin 56
8.1 The Northern Facies belt 56
8.2 The Central Facies belt 58
8.3 The Southern Facies belt 60
8.4 Comments on the "Mitteldeutsche
Schwelle" 61
9. Factors controlling the depositional model .64
9.1 Palaeogeography and palaeoclimatic
conditions 64
9.2 Subsidence 65
9.3 The sea level 67
9.4 The mode of siliciclastic input 69
10. Conclusions 71
Acknowledgements 73
References 74