Argile Microconglomerat Formation

Argile Microconglomerat Fm

Period:

Ordovician

Age Interval:

Hirnantian.

Province:
Oued Mya Basin

Type Locality and Naming

Informal name after sediment facies, which is a glacial-marine origin.

Synonym: Hassi el Hadjar (Spina, 2015); Argile Microconglomérat Fm; Microconglomerate claystone (translation of facies name); Argile Microcongl. Fm (abbreviated; Klett, 2000 charts).

References: Klett, 2000.

Lithology and Thickness

The Argile Microconglerat Fm is made up of microconglomeratic mudstones that is truncated at its base by the Glacial Unconformity. Interpreted as glacial-marine in origin. It is laterally equivalent to the Bir Tlacsin Fm of the Ghadames Basin (Klett, 2000).

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

It is truncated at its base by the Glacial Unconformity; below which is the Gres d’Oued Saret Fm.

Upper contact

It is conformably overlain by the Gres de Remada Fm.

Regional extent

GeoJSON

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Fossils

Age

Hirnantian “on the basis of the occurrence of the elongata and oulebsiri biozones of the northern Gondwana chitinozoan zones” (Spina, 2015, citing Paris et al., 2000).

Age Span:

Beginning stage:

Hirnantian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

445.21

Ending stage:

Hirnantian

Fraction up in the ending stage:

1.0

Ending date (Ma):

443.07

Depositional setting

Interpreted as glacio-marine from a transgressive event resulting from the initial melting of the Late Ordovician Gondwana ice cap (e.g., Spina, 2015, citing Paris et al., 2000).

Depositional pattern:

Additional Information

Compiler:

Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following books:

Baouche, R., Ganguli, S. S., Sen, S., Radwan A. E. (2023): Assessment of reservoir stress state and its implications for Paleozoic tight oil reservoir development in the Oued Mya Basin, northeastern Algerian Sahara. Geosystems and Geoenvironment 2: pp.1-18. https://doi.org/10.1016/j.geogeo.2022.100112

Fadila B. (2004): Reservoir Characterization and Reservoir Modeling in the Northwestern Part of Hassi Massaoud Field Algeria. A PhD thesis at the University of Hamburg, Hamburg, Germany.

T.R. Klett (2000): Total Petroleum Systems of the Trias/Ghadames Province, Algeria, Tunisia, and Libya - The Tanezzuft-Oued Mya, Tanezzuft-Melrhir, and Tanezzuft-Ghadames. U.S. Geological Survey Bulletin, 2202-C.

Kraouia et al., (2023): Ordovician–Upper Silurian–Triassic Petroleum System Assessment in the Chotts Area. In S. Khomsi and F. Roure (eds.), Geology of North Africa and the Mediterranean: Sedimentary Basins and Georesources, Regional Geology Reviews, https://doi.org/10.1007/978-3-031-18747-6_7

Spina, A. (2015): Latest Ordovician (Hirnantian) miospores from the Nl-2 well, Algeria, North Africa, and their evolutionary significance. Palynology, 39(2): 205-219. 5-219, http://dx.doi.org/10.1080/01916122.2014.944626.