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Pre-Karroo

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Journal Article
Published: 01 May 1944
Geological Magazine (1944) 81 (3): 143–144.
Journal Article
Published: 01 September 1943
Geological Magazine (1948) 80 (5): 161–170.
Journal Article
Published: 01 May 1963
Geological Magazine (1963) 100 (3): 276–279.
...John Alfred Miller; P. E. Brown Abstract K/Ar age determinations on biotite from the carbonated biotite pyroxenite of the Musensi Hill intrusion gave 96 + or - 9 and 101 + or - 12 million years, or middle Cretaceous. The nearby Panda Hill carbonatite, on stratigraphic evidence, is considered pre...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1984
AAPG Bulletin (1984) 68 (9): 1200–1201.
... thermogenic processes. Hence, the geothermal history must have been more favorable than is generally inferred from present-day gradients. (2) Super-Karroo marine Jurassic sequences have been encountered in the Nhamura-1 well onshore, and Triassic marine sequences have been interpreted offshore from...
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1991
AAPG Bulletin (1991) 75 (7): 1255–1263.
.... The new age dates indicate that the post-Karroo to pre-Miocene history of the basin is one of relative quiescence and the modern rift is a relatively young feature. This interpretation is more consistent with the tectonic histories of the other basins of the Western rift. 1 Manuscript received...
FIGURES | View All (5)
Journal Article
Published: 01 September 1974
Journal of the Geological Society (1974) 130 (5): 427–440.
... Rundsch 1960 50 538 53 Bloomfield, K. 1959. Geology of Ilomba Hill, Karonga District. Ann. Rep. geol. Surv. Dept. Nyasa-land for 1958, 30 pp Bloomfield K. The pre-Karroo geology of Malawi Mem. geol. Surv. Dept. Malawi 1968 5 166 Brock, P. W. G. 1963. The Mbozi Syenite...
Journal Article
Published: 01 October 1972
Bulletin of the Seismological Society of America (1972) 62 (5): 1211–1216.
... . Mortelmans G. (1951) . Considérations sur la stratigraphie des terrains pre-Karroo du nord-ouest du Katanga , Compt. Rend. 3 e Congr. Nat. Sc. 1950 8 , 26 - 29 . Mortelmans G. (1953) . Les...
Journal Article
Published: 01 September 1974
Journal of the Geological Society (1974) 130 (5): 449–460.
... D. R. Lupa Goldfield Bull. Geol. Surv. Tanganyika 1932 3 Harpum J. R. Some problems of pre-Karroo geology in Tanganyika Compte Rendu Geol Congr Intern igeme, Algiers 1954 20 209 239 Harpum J. R. Recent investigations in pre-Karroo geology in Tanganyika Compte Rendu...
Series: AAPG Memoir
Published: 01 January 1992
DOI: 10.1306/M53552C11
EISBN: 9781629811079
...Abstract Abstract Sea floor spreading between Africa and the Madagascar-India-Seychelles block began during the Jurassic Magnetic Quiet Zone and was preceded by earlier rifting of Gondwanaland and deposition of Karroo sediments. Basal clastic deposition was terminated in the Early Jurassic...
Series: GSA Special Papers
Published: 01 January 1988
DOI: 10.1130/SPE226-p1
... (DSDP) offshore drilling, Lamont-Doherty multichannel seismic (MCS) data, and single-channel seismic data. Herein we present (1) maps displaying lithological columnar sections for Karroo (Permo-Carboniferous through Early Jurassic) to Quaternary time slices, (2) depth-to-basement and sediment isopach...
Journal Article
Published: 01 January 1973
Journal of the Geological Society (1973) 129 (1): 61–85.
...JOHN BARRY DAWSON; JOHN BARRY HAWTHORNE Abstract At Benfontein, near Kimberley, South Africa, three sills of kimberlite intrude Dwyka shales and overlying Karroo dolerite. Each sill results from numerous injections of kimberlite that have consolidated to give the sill a layered appearance. Many...
Series: GSA Special Papers
Published: 01 January 1955
DOI: 10.1130/SPE62-p593
... of mammals is known from a rather imperfect evolutionary sequence from the Permo-Triassic Karroo deposits of South Africa. Similar faunas inhabited Asia. Although local environmental effects of the Cape orogeny may have influenced evolution in the direction of mammals, the trend toward mammalian structure...
Journal Article
Published: 01 July 1972
Journal of the Geological Society (1972) 128 (4): 311–336.
.... + + + + ~ 4- + + + ÷ + + ° OUTH + 4. + . . . . ~ '~ ' ; ' ;~ ' , ' ; ' . .+ 4 30OE 0 100 200 300 4o0 Kilometres ~Post Karroo ~] Plutonic'~ Karroo Centres ~ Volcanic ~ Lavas J Cycle ~ Sediments ~Pre Karroo F xo. x. Local ity map for south-eastern Africa showing distr ibution of Karroo sediments, and lavas...
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1951
AAPG Bulletin (1951) 35 (7): 1597–1628.
... A major part of the surface of Africa consists of pre-Cambrian igneous and metamorphic basement rocks or pre-Cambrian and earliest Paleozoic non-fossiliferous sediments (darkest pattern, Fig. 1 ) and is thus almost entirely lacking in petroleum possibilities. Over much of the remainder of Africa, also...
FIGURES | View All (6)
Image
Comparison with nature: Tanganyika-Rukwa rift segments (East Africa). (A) C...
Published: 29 August 2019
indicate Victoria-Nubia plates relative motion in mm/yr ( Stamps et al., 2008 ). Red dashed lines indicate the location of the inferred pre-existing crustal weaknesses, inherited from a Karroo-age extensional tectonic stage. LM—Lake Mweru; UR:—Usangu rift. (C) Top view digital elevation models of Model B
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1953
AAPG Bulletin (1953) 37 (9): 2163–2177.
... of these, in all but a few cases, has remained purely academic. Fig. 1. —Restoration of Gondwana super-continent, showing present distribution of late Paleozoic and Triassic terrestrial formations (including glacials and coals). Great Karroo basin in oval. All reconstructions were made with perspex shapes...
FIGURES
Journal Article
Published: 01 July 1971
Journal of the Geological Society (1971) 127 (4): 411–425.
...: Dixey postulated that the rift features were initiated in Pre-Karroo times and that Tertiary movements have merely modified it ? Reply: It is difficult to say whether any of the faults are Pre-Karroo in age. Certainly the Karroo was much more widespread, and remnants have been preserved by post-Karroo...
Journal Article
Published: 01 March 1971
Journal of the Geological Society (1971) 127 (2): 189–191.
...., C.S.I.R., Pretoria). Five excursions gave delegates an introduction to the South African Cape and Karroo Supergroups. A pre-Symposium excursion at Kimberley showed the famous Dwyka glaciated pavements at Nooitgedacht, and diamond mining and processing. Weekend excursions during the Gape Town meetings...
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1952
AAPG Bulletin (1952) 36 (7): 1395–1426.
... reserved 1952 American Association of Petroleum Geologists A major part of the surface of Africa consists of pre-Cambrian igneous and metamorphic basement rocks or pre-Cambrian and earliest Paleozoic non-fossiliferous sediments (darkest pattern, Fig. 1 ) and is thus almost entirely lacking...
FIGURES | View All (11)
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1975
AAPG Bulletin (1975) 59 (3): 542.
... presented a valuable summary of the geology of the Gabon coastal basin. On page 223, he stated: “The age of the pre-Cocobeach generally is assumed to be Late Jurassic, but the writer does not know whether reliable age determinations have been made.” During recent years, various publications have mentioned...