A geotectonic history of the northern Mozambique Basin including the Beira High – A contribution for the understanding of its development

Mahanjane, Estevão Stefane

doi:10.1016/j.marpetgeo.2012.05.007

Cited by 60 publications

(77 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1). Both structural interpretation (Mahanjane, 2012) and seismic velocities derived from refraction seismic data (Müller et al, 2016) indicate that the Beira High is made up of stretched and highly intruded continental crust. The Astrid Ridge in the western Riiser-Larsen Sea ( Fig.…”

Section: Enigmatic Crustal Blocks In the Mozambique Basin And The Riimentioning

confidence: 99%

“…1) is suggested to have separated from Africa during the initial opening of the Mozambique Basin (e.g., Nguyen et al, 2016). As significant differences in the amount of stretching are observed below the margins of the Beira High, some authors propose a rift jump during the early rifting stage from the northwestern to the southeastern edge of the Beira High (e.g., Mahanjane, 2012;Müller et al, 2016). Mahanjane (2012) observes two rift phases in reflection seismic data covering the Beira High and postulates a two-breakup-stage concept.…”

Section: Implications For Gondwana Breakupmentioning

confidence: 99%

“…2a,4 and 6) are highlighted with red lines. The location of the Beira High is from Mahanjane (2012). Magnetic isochrons (yellow lines) and oceanic fracture zones (dashed white lines) are compiled from Leinweber and Jokat (2012) and Müller and Jokat (2017).…”

Section: Introductionmentioning

confidence: 99%

“…1) remains poorly studied. Existing studies focus mostly on the sedimentary infill of the Mozambique Basin (e.g., Castelino et al, 2015;Mahanjane, 2014;Salman and Abdula, 1995) or the crustal structure in the western and central parts of the Mozambique Basin (e.g., Leinweber et al, 2013;Mahanjane, 2012;Müller and Jokat, 2017;Mueller et al, 2016). While it is generally accepted that the RiiserLarsen Sea is the conjugate of the Mozambique Basin (e.g., Jokat et al, 2003;Nguyen et al, 2016), it remains much less well studied in spite of an available set of modern geophysical data (e.g., Hinz et al, 2004;Leitchenkov et al, 2008;Roeser et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tie points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa and the Riiser-Larsen Sea, Antarctica

Klimke

Franke

Mahanjane³

et al. 2018

Solid Earth

Self Cite

View full text Add to dashboard Cite

Abstract. Movements within early East Gondwana dispersal are poorly constrained, and there is debate about conjugate geologic structures and the timing and directions of the rifting and earliest seafloor spreading phases. We present a combined structural interpretation of multichannel reflection seismic profiles from offshore of northern Mozambique (East Africa) and the conjugate Riiser-Larsen Sea (Antarctica). We find similar structural styles at the margins of both basins. At certain positions at the foot of the continental slope close to the continent-ocean transition, the basement is intensely deformed and fractured, a structural style very untypical for rifted continental margins. Sediments overlying the fractured basement are deformed and reveal toplap and onlap geometries, indicating a post-breakup deformation phase. We propose this unique deformation zone as a tie point for Gondwana reconstructions. Accordingly, we interpret the western flank of Gunnerus Ridge, Antarctica as a transform margin similar to the Davie Ridge offshore of Madagascar, implying that they are conjugate features. As the continental slope deformation is post-rift, we propose a two-phase opening scenario. A first phase of rifting and early seafloor spreading, likely in NW-SE direction, was subsequently replaced by a N-S-directed transform deformation phase overprinting the continent-ocean transition. From previously identified magnetic chrons and the sediment stratigraphy, this change in the spreading directions from NW-SE to N-S is suggested to have occurred by the late Middle Jurassic. We suggest that the second phase of deformation corresponds to the strikeslip movement of Madagascar and Antarctica and discuss implications for Gondwana breakup.

show abstract

Section: Enigmatic Crustal Blocks In the Mozambique Basin And The Riimentioning

confidence: 99%

Section: Implications For Gondwana Breakupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tie points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa and the Riiser-Larsen Sea, Antarctica

Klimke

Franke

Mahanjane³

et al. 2018

Solid Earth

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Zambezi River is one of the primary sources for sediment supply to the upper fan with as much as 60 Mio tonnes being drained annually into the basin (Kolla et al 1980b;Van der Lubbe et al 2014;Walford et al 2005). The thickest (up to 12 km) sedimentary sequence is located in the ZDD, with thicknesses of 6-8 km in other parts of the Central Mozambique Basin (Castelino et al 2015;Mahanjane 2012;Salazar et al 2013;Salman and Abdula 1995).…”

Section: Geological Setting and Previous Workmentioning

confidence: 99%

Response of Cenozoic turbidite system to tectonic activity and sea-level change off the Zambezi Delta

2017

View full text Add to dashboard Cite

show abstract

Reconstruction of the East Africa and Antarctica continental margins

et al. 2016

View full text Add to dashboard Cite

The Early Jurassic separation of Antarctica from Africa plays an important role in our understanding of the dispersal of Gondwana and Pangea. Previous reconstruction models contain overlaps and gaps in the restored margins that reflect difficulties in accurately delineating the continent‐ocean‐boundary (COB) and determining the amount and distribution of extended continental crust. This study focuses on the evolution of the African margin adjacent to the Mozambique Basin and the conjugate Antarctic margin near the Riiser‐Larsen Sea. Satellite‐derived gravity data have been used to trace the orientations and landward limits of fracture zones. A 3‐D gravity inversion has produced a crustal thickness model that reliably quantifies the extent and amount of stretched crust. Crustal thicknesses together with fracture zone terminations reveal COBs that are significantly closer to the African and Antarctic coasts than previously recognized. Correlation of fracture zone azimuths and identified COBs suggests Antarctica began drifting away from Africa at approximately 171 Ma in a roughly SSE direction. An areal‐balancing method has been used to restore the crust to a uniform prerift thickness so as to perform a nonrigid reconstruction for both nonvolcanic and volcanic margins. Both margins reveal a trend of increasing extension from east to west. Our results suggest Africa underwent extension of 60–120 km, while Antarctic crust was stretched by 105–180 km. Various models tested to determine the direction of extension during rifting suggest that Antarctica moved away from Africa in a WNW‐ESE direction during the period between 184 and 171 Ma prior to the onset of seafloor spreading.

show abstract

A geotectonic history of the northern Mozambique Basin including the Beira High – A contribution for the understanding of its development

Cited by 60 publications

References 25 publications

Tie points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa and the Riiser-Larsen Sea, Antarctica

Tie points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa and the Riiser-Larsen Sea, Antarctica

Response of Cenozoic turbidite system to tectonic activity and sea-level change off the Zambezi Delta

Reconstruction of the East Africa and Antarctica continental margins

Contact Info

Product

Resources

About