Post-Pan-African tectonic evolution of South Malawi in relation to the Karroo and recent East African rift systems

Castaing, C.

doi:10.1016/0040-1951(91)90232-h

Cited by 69 publications

(125 citation statements)

References 42 publications

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“…2). Within these basins, synsedimentary faulting observed in the oldest Karoo age strata indicates a common occurrence of incipient sedimentation and tectonic activity in EarlyLate Permian times (Habgood 1963;Verniers et al 1989;Castaing 1991;Catuneanu et al 2005 and references therein). The Cabora Bassa Basin and the Shire Valley (Fig.…”

Section: Late Palaeozoic -Early Mesozoic Intracontinental Rift Basinmentioning

confidence: 97%

“…However, rift basins fringing northern Mozambique exhibit spatially contrasting and temporally discontinuous sedimentary records. Rift basins located to the north (Metangula Basin) and west (Shire Valley) of the basement (Figs 1 & 2) predominantly comprise continental sediments of Late Palaeozoic -Late Triassic/Early Jurassic age (Castaing 1991;Catuneanu et al 2005). The marginal Rovuma and Mozambique rift basins solely exhibit Early-Middle Jurassic -Cenozoic marine and terrestrial strata that also overlap onto the basement (Pinna et al 1993;Salman & Abdula 1995) (Figs 1 & 2).…”

mentioning

confidence: 97%

“…K represents isolated outcrops of Karoo age volcanics of c. 180 -160 Ma in age (Jaritz et al 1977;Grantham et al 2005b). The map was compiled and modified after Castaing (1991), Catuneanu et al (2005) and Harrowfield et al (2005). Pinna et al (1993), Andreoli (1984), Kröner et al (2001) and Perits et al (2002) with superimposed locations of samples used for 39 Ar/ 40 Ar and TFT analyses.…”

mentioning

confidence: 99%

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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating

Daszinnies

Jacobs

Wartho

et al. 2009

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This research paper investigates the thermo-tectonic history of the north Mozambican basement subsequent to the Pan-African metamorphism. Six 40 Ar/ 39 Ar hornblende, three 40 Ar/ 39 Ar biotite and 25 titanite fission-track data place new constraints on the earliest timing of rifting in the central sector of Gondwana, and demonstrate a close linkage between the geometric rift configuration and the ductile metamorphic basement fabrics during the initial dispersal of the supercontinent.The 40 Ar/ 39 Ar hornblende and biotite ages range from c. 542 to 456 Ma and from c. 448 to 428 Ma, respectively. These data record slow basement cooling after the latest Pan-African metamorphism at rates of c. 7-11 8C Ma 21 between Early and Late Ordovician times. Locally, syn-to post-tectonic granitoid emplacements around 500-450 Ma delayed basement cooling to Late Ordovician-Early Silurian times. The titanite fission-track (TFT) ages fall into two age groups of c. 378 -327 Ma and c. 284-219 Ma. The older TFT ages record very slow cooling from the Late Ordovician-Early Silurian to below 275 + 25 8C in the Late Devonian-Early Carboniferous at slow rates of less than 1 8C Ma 21 . This slow cooling is related to decreasing denudation in association with the establishment of pre-Karoo peneplains in central Gondwana. The younger TFT ages record denudation due to rift flank uplift in the context of initial Gondwana disintegration in the Mozambican sector. Corresponding Early-Late Permian crustal extension proceeded obliquely to a NW-SE tensional palaeo-stress field and was associated with a brittle reactivation of easterly trending ductile basement fabrics. In total, up to 9-12 km of denudation is deduced from the TFT results since Permo-Carboniferous times.

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Section: Late Palaeozoic -Early Mesozoic Intracontinental Rift Basinmentioning

confidence: 97%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating

Daszinnies

Jacobs

Wartho

et al. 2009

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“…It seems that tectonics in the area have acted at different times, the oldest being at 2000 -1400 m y; the youngest still active today. These are considered to be mainly due to the reactivation of NW-SE structures (Tiercelin et al, 1988), which resulted in the creation of NE-SW troughs (Castaing, 1991). The Tertiary and Quaternary are developed along the major drainage systems including Lake Malawi, and includes alluvial sediments.…”

Section: Geological Settingmentioning

confidence: 99%

“…These rocks are best developed in the southern part of the country. The Cretaceous was a transition period between the Karoo rifting and the formation of the recent East African Rift system (Castaing, 1991). It seems that tectonics in the area have acted at different times, the oldest being at 2000 -1400 m y; the youngest still active today.…”

Section: Geological Settingmentioning

confidence: 99%

Comparative study of the silica and cation geothermometry of the Malawi hot springs: Potential alternative energy source

Dulanya

Morales-Simfors

Sivertun

2010

Journal of African Earth Sciences

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Hierarchical segmentation of the Malawi Rift: The influence of inherited lithospheric heterogeneity and kinematics in the evolution of continental rifts

et al. 2015

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We used detailed analysis of Shuttle Radar Topography Mission-digital elevation model and observations from aeromagnetic data to examine the influence of inherited lithospheric heterogeneity and kinematics in the segmentation of largely amagmatic continental rifts. We focused on the Cenozoic Malawi Rift, which represents the southern extension of the Western Branch of the East African Rift System. This north trending rift traverses Precambrian and Paleozoic-Mesozoic structures of different orientations. We found that the rift can be hierarchically divided into first-order and second-order segments. In the first-order segmentation, we divided the rift into Northern, Central, and Southern sections. In its Northern Section, the rift follows Paleoproterozoic and Neoproterozoic terrains with structural grain that favored the localization of extension within well-developed border faults. The Central Section occurs within Mesoproterozoic-Neoproterozoic terrain with regional structures oblique to the rift extent. We propose that the lack of inherited lithospheric heterogeneity favoring extension localization resulted in the development of the rift in this section as a shallow graben with undeveloped border faults. In the Southern Section, Mesoproterozoic-Neoproterozoic rocks were reactivated and developed the border faults. In the second-order segmentation, only observed in the Northern Section, we divided the section into five segments that approximate four half-grabens/ asymmetrical grabens with alternating polarities. The change of polarity coincides with flip-over full-grabens occurring within overlap zones associated with~150 km long alternating border faults segments. The inherited lithospheric heterogeneity played the major role in facilitating the segmentation of the Malawi Rift during its opening resulting from extension. Key Points:• Segmentation of the Malawi Rift is studied using SRTM DEM and magnetic data • The rift is hierarchically divided into first-order and second-order segments • Lithospheric heterogeneity controls firstand second-order segmentation

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Post-Pan-African tectonic evolution of South Malawi in relation to the Karroo and recent East African rift systems

Cited by 69 publications

References 42 publications

Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating

Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating

Comparative study of the silica and cation geothermometry of the Malawi hot springs: Potential alternative energy source

Hierarchical segmentation of the Malawi Rift: The influence of inherited lithospheric heterogeneity and kinematics in the evolution of continental rifts

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Post-Pan-African tectonic evolution of South Malawi in relation to the Karroo and recent East African rift systems

Cited by 69 publications

References 42 publications

Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from 40 Ar/ 39 Ar hornblende, biotite and titanite fission-track dating

Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from 40 Ar/ 39 Ar hornblende, biotite and titanite fission-track dating

Comparative study of the silica and cation geothermometry of the Malawi hot springs: Potential alternative energy source

Hierarchical segmentation of the Malawi Rift: The influence of inherited lithospheric heterogeneity and kinematics in the evolution of continental rifts

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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating

Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from ⁴⁰ Ar/ ³⁹ Ar hornblende, biotite and titanite fission-track dating