Rio Nhavudezi Fm
Period:
Jurassic
Age Interval:
Toarcian
Province:
Moatize-Minjova Basin
Type Locality and Naming
In the Tete Province, these basaltic lavas and more felsic varieties form prominent flat-top mountains and a large dome structure. Correlative with the Karoo basalts that are widespread throughout south Africa.
Lithology and Thickness
The Rio Nhavúdezi Formation comprisesa several kilometer-thick pile of basaltic lavas. Only a thin sliver of these ‑ ne-grained, low-MgO basalts are exposed north of the Singuédzi River. Here the basalts occur in weathered outcrops as massive rocks, lacking amygdales or other features typical to lava flows. Most probably, these outcrops represent massive, medium to coarse-grained flow cores, with the amygdaloidal flow top being mostly covered.
Lithology Pattern:
Lava
Relationships and Distribution
Lower contact
Upper contact
Regional extent
GeoJSON
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Fossils
Age
Early Toarcian (synchronous with Karoo basalts?)
Age Span:
Beginning stage:
Toarcian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
184.20
Ending stage:
Toarcian
Fraction up in the ending stage:
1.0
Ending date (Ma):
174.70
Depositional setting
Continental
Depositional pattern:
Additional Information
Compiler:
Jamal, Daúde; Sitoe, Sandra; Siquela, Eduardo; Venâncio, Jazilo; Lourenço, Ester (2024), Stratigraphic Lexicon: The Sedimentary Formations of the Republic of Mozambique, Africa.