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Richat

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Journal Article
Journal: Geology
Published: 01 August 2005
Geology (2005) 33 (8): 665–668.
...Guillaume Matton; Michel Jébrak; James K.W. Lee Abstract The Richat structure (Sahara, Mauritania) appears as a large dome at least 40 km in diameter within a Late Proterozoic to Ordovician sequence. Erosion has created circular cuestas represented by three nested rings dipping outward from...
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Journal Article
Published: 01 January 1971
Bulletin de la Société Géologique de France (1971) S7-XIII (1-2): 111–117.
... Precambrian Richat sedimentary rocks stratigraphy unconformities upper Precambrian West Africa ...
Journal Article
Journal: GSA Bulletin
Published: 01 July 1969
GSA Bulletin (1969) 80 (7): 1367–1372.
...ROBERT S DIETZ; ROBERT FUDALI; WILLIAM CASSIDY Abstract The 38-km-diameter Richat Dome, in central Mauritania, has been widely regarded as a possible astrobleme. Our field examination of the structure and subsequent petrographic study of the critical rock types failed to reveal a single feature...
Image
SRTM digital elevation model of the Guelb er <span class="search-highlight">Richat</span> structure. Note smaller...
Published: 01 October 2012
FIGURE 4. SRTM digital elevation model of the Guelb er Richat structure. Note smaller Semsiyat dome to the southwest.
Image
Figure 1. A: Location map for <span class="search-highlight">Richat</span> dome. Taoudenni Basin is shaded. B: Bl...
Published: 01 August 2005
Figure 1. A: Location map for Richat dome. Taoudenni Basin is shaded. B: Block diagram displaying distribution of magmatic phases: basaltic (gray), felsic (crosses), and kimberlitic (triangles). External basaltic ring dike is displaced by NNE-SSW fault system in northeastern part of structure
Image
Figure 2. Modified satellite image of <span class="search-highlight">Richat</span> structure after  NASA&#x2F; GSFC&#x2F;ME...
Published: 01 August 2005
Figure 2. Modified satellite image of Richat structure after NASA/ GSFC/METI/ERSDAC/JAROS and U.S./Japan ASTER Science Team, 2000 . ENE-WSW faults display sinistral movement as shown by offset of external cuesta.
Image
(a) Simplified map of West Africa (after Peucat  et al .  2005 ) showing th...
Published: 13 November 2013
by the black bold line. The white star in the Mauritanian Adrar marks the location of the Richat structure.
Journal Article
Journal: SEG Discovery
Published: 01 October 2012
SEG Discovery (2012) (91): 1–17.
...FIGURE 4. SRTM digital elevation model of the Guelb er Richat structure. Note smaller Semsiyat dome to the southwest. ...
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Journal Article
Journal: SEG Discovery
Published: 01 October 2012
SEG Discovery (2012) (91): 1–44.
... Guelb er Richat Granites of experienced logistical and material providers. Territorial Semsiyat dome Archean 20° N 20° N Guelb Greenstone belts Nich Granites disputes between neighbors to the north and Toureg uprisings Fig. 3 SudAkjoujt Tiris Complex Amsaga Complex in Mali, Mauritania s neighbor...
Journal Article
Published: 13 November 2013
Geological Magazine (2014) 151 (5): 885–898.
... by the black bold line. The white star in the Mauritanian Adrar marks the location of the Richat structure. ...
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Journal Article
Journal: Economic Geology
Published: 01 August 2005
Economic Geology (2005) 100 (5): 1055–1066.
... density control on vapor-liquid partitioning of metals in hydrothermal systems— Gleb S. Pokrovski, Jacques Roux, and Jean-Claude Harrichoury 657 Resolving the Richat enigma: Doming and hydrothermal karstification above an alkaline complex— Guillaume Matton, Michel Jébrak, and James K.W. Lee 665...
Journal Article
Published: 01 October 1998
Earth Sciences History (1998) 17 (2): 139–156.
...,” p. 3. Dietz liked to brag that he had never received a government grant (e.g., “Life and times,” pp. 2–3), but of course he was a government employee for most of his career. 159. E.g., Robert S. Dietz, R. Fudali, and W. Cassidy, “Richat and Semsiyat domes (Mauritania): not astroblemes...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2008
DOI: 10.1144/SP297.5
EISBN: 9781862395459
... Richat structure, dated at 100 Ma ( Poupeau et al. 1996 ). It seems clear in the Eglab shield, that without dating the important doleritic and gabbro–doleritic sill and dyke swarms, their emplacement could thus far be attributed to: the Eburnean magmatic events; the Pan-African continental margin...
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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP287.15
EISBN: 9781862395350
... associated with bacteria). He had a passionate interest in the concentric complex of the Richat in Mauritania which he had discovered in 1934. This was a strange ring-shaped geological structure, composed of Precambrian sediments and containing siliceous rocks made of primitive unicellular micro-organisms...
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Series: Geological Society, London, Special Publications
Published: 09 July 2021
DOI: 10.1144/SP502-2019-101
EISBN: 9781786209900
...); 8: Assabet foreland-basin deposits; 9: unconformity below Group Jbéliat glacial deposits; 10: frontal thrust in Northern Mauritanides; 11: Tacarat-Inemmaudene shear zone; 12: Guelb Er Richat, subsurface laccolith; 13–14: Akjoujt sector and Archaean tectonic windows beneath Mauritanides thrust belt...
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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP287.16
EISBN: 9781862395350
... ’ at the 19th International Geological Congress in Algiers ( Monod 1954 ). (‘Accidents’ are any features that interrupt regional structures without obvious cause). Monod described five Mauritanian craters: Aouelloul, Tenoumer, Temimichat Ghallaman, Richât, and Semisayat. Although one investigator, A. Allix...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2008
DOI: 10.1144/SP297.8
EISBN: 9781862395459
... and southern parts of the Mauritanide belt and the Bassaride and Rokelide belts. Mkb, Madina–Kouta basin; Tgt, Taganet; Ass, Assaba; Tbb, Tambaoura; SMb, Senegalo-Mauritanian basin; Dbl.b, Diourbel basin; Yb, Youkounkoun basin; Tbb, Taban trough; RT, Richat trough; Ft, Falémé trough; Kbt, Komba trough; Kct...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP326.8
EISBN: 9781862395749
...). In Mauritania, the dykes appear to be rare in the northwestern part of the Taoudenni Basin (Richat, Adrar) (Beicip 1980, unpublished), but very frequent in the Mauritanian Hank ( Lahondère et al. 2003 ). Source rocks within a few metres of the dykes are prone to be overcooked due to contact metamorphism. More...
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