[ Trois types de cycles eustatiques du shelf margin system tract du camp JVL dans le Sous-Groupe Schisto-Calcaire (Province du Kongo Central, R.D. Congo) ]
Volume 35, Issue 1, December 2021, Pages 184–194
C. M. E. Cibambula1, M. J. A. Makutu2, and L. O. Tuema3
1 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
2 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
3 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
Original language: French
Copyright © 2021 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Between two stromatolitic reefs of Collenia (LLH) and Cryptozoon (SH) of the JVL encampment outcrop alternate brecciated, bedded and massive limestones beds belonging to Schisto-calcaire Subgroup. And as the bathymetry fluctuates from supratidal flat to intertidal in the biostromes, the depositional systems of brecciated, bedded and massive limestones regularly change from lagoon to tidal flat. By the presence of the evaporite, of the re-worked elements and of the erosional figures formed by the tidal chenal, the JVL encampment outcrop constitutes a shelf margin system tract deposited after a moderate sea level fall on the continental plateau overlain of brackish water and isolated of clastic material supply under a desertic climate within the later Ediacaran period. This regression, caused by a local epirogenic mouvement, is enameled of numerous minor sedimentary cycles.
Author Keywords: Schisto-calcaire, Collenia, Cryptozoon, eustatic cycle, lagon, tidal flat, tidal chenal, regression, shelf margin system tract, sedimentary cycle.
Volume 35, Issue 1, December 2021, Pages 184–194
C. M. E. Cibambula1, M. J. A. Makutu2, and L. O. Tuema3
1 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
2 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
3 Université de Kinshasa, Faculté des Sciences, Département des Géosciences, Géologie, Post office Box 190, Kinshasa XI, RD Congo
Original language: French
Copyright © 2021 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Between two stromatolitic reefs of Collenia (LLH) and Cryptozoon (SH) of the JVL encampment outcrop alternate brecciated, bedded and massive limestones beds belonging to Schisto-calcaire Subgroup. And as the bathymetry fluctuates from supratidal flat to intertidal in the biostromes, the depositional systems of brecciated, bedded and massive limestones regularly change from lagoon to tidal flat. By the presence of the evaporite, of the re-worked elements and of the erosional figures formed by the tidal chenal, the JVL encampment outcrop constitutes a shelf margin system tract deposited after a moderate sea level fall on the continental plateau overlain of brackish water and isolated of clastic material supply under a desertic climate within the later Ediacaran period. This regression, caused by a local epirogenic mouvement, is enameled of numerous minor sedimentary cycles.
Author Keywords: Schisto-calcaire, Collenia, Cryptozoon, eustatic cycle, lagon, tidal flat, tidal chenal, regression, shelf margin system tract, sedimentary cycle.
Abstract: (french)
Entre deux récifs stromatolitiques à Collenia (LLH) et Cryptozoon (SH) de l’affleurement du camp JVL alternent des bancs de calcaires bréchiques, lités et massifs appartenant au Sous-groupe Schisto-Calcaire. Tout comme la bathymétrie oscille du flat supratidal à intertidal dans les biostromes, les milieux de dépôt de calcaires bréchiques, lités et massifs changent régulièrement du lagon restreint au flat intertidal. Par la présence des évaporites, des éléments remaniés et des figures érosionelles formées par des chenaux tidaux, l’affleurement du camp JVL constitue un shelf margin system tract déposé après une chute modérée du niveau marin sur un plateau continental recouvert d’eaux saumâtres et isolé d’apport clastiques sous un climat désertique vers la fin de l’Ediacarien. Cette régression, causée par un mouvement épirogénique local, est jonchée de plusieurs cycles sédimentaires mineurs.
Author Keywords: Schisto-calcaire, Collenia, Cryptozoon, cycle eustatique, lagon, flat intertidal, chenal intertidal, régression, shelf margin system tract, cycle sédimentaire.
How to Cite this Article
C. M. E. Cibambula, M. J. A. Makutu, and L. O. Tuema, “Three types of eustatic cycles of the shelf margin system tract of the JVL camp in the Schisto-Limestone Sub-Group (Kongo Central Province, R.D. Congo),” International Journal of Innovation and Applied Studies, vol. 35, no. 1, pp. 184–194, December 2021.
