Geochronology of the Precambrian crust in the Mozambique belt in NE Mozambique, and implications for Gondwana assembly

Bingen, Bernard; Jacobs, Joachim; Viola, Giulio; Henderson, I. H. C.; Skår, Øyvind; Boyd, Rognvald; Thomas, Robert J.; Solli, Arne; Key, R.M.; Daudi, E.

doi:10.1016/j.precamres.2009.01.005

Cited by 181 publications

(161 citation statements)

References 107 publications

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“…This is a common association for post-collisional granites in the EAO, and in some areas the later deformation on the shear zones has been associated with orogenic collapse (Jacobs and Thomas, 2004;Jacobs et al, 2008;Bingen et al, 2009;Grégoire et al, 2009;Viola et al, 2008). Although field evidence for this is limited in northern Madagascar, we can use these analogies to tentatively suggest that the earliest Maevarano Suite magmas were emplaced at the end of the collisional event, but that voluminous main phase magmatism was associated with extensional collapse of the orogen, with extensional shear zones providing the pathways for magma ascent.…”

Section: Sample Rk7248a [Grid Ref 632500 1175988]mentioning

confidence: 86%

Post-collisional magmatism in the central East African Orogen: The Maevarano Suite of north Madagascar

Goodenough

Thomas

Waele

et al. 2010

Lithos

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Section: Sample Rk7248a [Grid Ref 632500 1175988]mentioning

confidence: 86%

Post-collisional magmatism in the central East African Orogen: The Maevarano Suite of north Madagascar

Goodenough

Thomas

Waele

et al. 2010

Lithos

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“…The high-grade basement of northeast Mozambique is made up of a collage of gneiss complexes with Meso-to Neoproterozoic protolith ages, which underwent amphibolite facies metamorphism during the late Ediacaran (Grantham et al 2008;Bingen et al 2009;Boyd et al 2010;Macey et al 2010). We refer to the (mostly orthogneissic) complexes north of the Lú rio Belt as the "northern basement," while the single Nampula Complex to the south is accordingly termed "southern basement" (fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…550 Ma, while the northwesternmost terrane (Unango Complex) retains evidence of an older granulite-facies metamorphism at ca. 950 Ma (Bingen et al 2009;Boyd et al 2010). In the Mesoproterozoic Nampula Complex, two potentially overlapping phases of metamorphism occurred between ca.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In the Mesoproterozoic Nampula Complex, two potentially overlapping phases of metamorphism occurred between ca. 550 and 490 Ma, under mid-to upper amphibolite facies conditions (Macey et al 2007(Macey et al , 2010Norconsult Consortium 2007;Grantham et al 2008;Bingen et al 2009). …”

Section: Geological Backgroundmentioning

confidence: 99%

“…The ChilwaMavago Corridor has previously been interpreted as an array of Pan-African thrusts (Pinna et al 1993). In the northwest of the Unango Complex, extensive arrays of anastomosing shear zones (e.g., the Macaloge Shear Zone; Bingen et al 2009) connect with the Chilwa-Mavago Corridor and contain slivers of ca. 600 Ma metasedimentary rocks of marine affinity (Cobue and Geci Groups: Melezhik et al 2006;Boyd et al 2010).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

Ueda

Jacobs²,

Thomas³

et al. 2012

The Journal of Geology

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A B S T R A C TThe postcollisional tectonic development of northeast Mozambique and subsequent cooling from high-temperature metamorphism is delineated with an extensive new set of U-Pb titanite, 40 Ar/ 39 Ar hornblende, and 40 Ar/ 39 Ar mica analyses. The complex data suggest a polyphase metamorphic history from the late Neoproterozoic to the Ordovician within the East African-Antarctic Orogen (EAAO), with marked differences between the major constituent blocks. In all the data sets, samples from the basement south of the Lú rio Belt show generally younger ages than those from the north, resulting from a late metamorphic event and slow cooling between ca. 520 and 440 Ma. The ages north and south of the Lú rio Belt are consistently offset by ca. 30-70 Ma, a difference that is maintained and even appears to increase during cooling from very high temperatures to ca. 350ЊC. Based on the first-order assumption that all the ages are cooling ages, cooling rates in the south are estimated at ca. 7Њ-8ЊC/Ma, while those north of the Lú rio Belt are faster at ca. 16ЊC/Ma. The data are consistent with previous geochronological, petrographic, and field data and suggest a late high-temperature/low-pressure metamorphic event that affected only the basement rocks south of the Lú rio Belt and portions of the latter. This late metamorphism and subsequent delayed, slower cooling agree well with a model of elevated heat flow following lithosphere delamination in the southern part of the orogen, which also explains the observed widespread granitoid magmatism, migmatization, and renewed deformation in the southern basement.

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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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Geochronology of the Precambrian crust in the Mozambique belt in NE Mozambique, and implications for Gondwana assembly

Cited by 181 publications

References 107 publications

Post-collisional magmatism in the central East African Orogen: The Maevarano Suite of north Madagascar

Post-collisional magmatism in the central East African Orogen: The Maevarano Suite of north Madagascar

Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

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

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