Apatite fission track and (U-Th)/He thermochronology from the Archean Tanzania Craton: Contributions to cooling histories of Tanzanian basement rocks

Kasanzu, Charles H.

doi:10.1016/j.gsf.2016.09.007

Cited by 23 publications

(10 citation statements)

References 38 publications

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“…Dispersion in the AHe data set can make it difficult to produce accurate age predictions jointly modelled with AFT data. The inclusion of a radiation damage model within QTQt and diffusion parameters and resampling the AHe age error improves modelling results given the ranges of age dispersion and eU concentrations, while providing an objective mechanism for identifying individual grain ages that are incompatible (within analytical error) with the Guillaume et al, 2013;Kasanzu, 2017;Leprêtre et al, 2015;Wildman et al, 2015). In this study, initial modelling trials demonstrated that the Gautheron et al (2009) model produces AHe and AFT predictions closer to the observed values compared to RDAAM, though the differences were minor.…”

Section: Inverse Modellingmentioning

confidence: 70%

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Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

2018

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The Late Cenozoic is typically considered a time of widespread episodic tectonic uplift along the West Greenland continental margin (36-2 Ma), similar to other margins across the North Atlantic, such as Norway, East Greenland and the UK. The present study re-examines and remodels onshore thermochronological data from central West Greenland and the Cretaceous Nuussuaq Basin, utilising a Bayesian modelling approach and new concepts related to radiation damage within apatite. These new thermal histories indicate that slow-protracted cooling has occurred across the southern extent of the margin during the Mesozoic and Cenozoic, whereas those from within the Nuussuaq Basin display reheating through the Late Cretaceous/Palaeogene and cooling to present. Results suggest that no significant Late Cenozoic uplift has occurred along the southern margin, while cooling in the Nuussuaq Basin is consistent with events outlined in the basin's stratigraphy and implies uplift during volcanism and an isostatic response to the unroofing of the lithosphere has elevated the modern topography. These results imply significant tectonism in the region ceased by~45 Ma, yet have wider implications regarding how low temperature thermochronology data are treated and our understanding of the postrift evolution of passive margins. K E Y W O R D Smodelling, passive margins, stratigraphy, tectonics and sedimentation, thermochronology

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Section: Inverse Modellingmentioning

confidence: 70%

“…() model, have been shown to improve modelling results (e.g. Cogné et al., ; Guillaume et al., ; Kasanzu, ; Leprêtre et al., ; Wildman et al., ). In this study, initial modelling trials demonstrated that the Gautheron et al.…”

Section: Methodsmentioning

confidence: 99%

Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

2018

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“…Previous thermochronological studies in East Africa are primarily based on AFT and show that the regional basement underwent early Mesozoic monotonic cooling related to craton exhumation. The oldest AFT ages (>250 Ma) are reported from the Tanzanian Craton in SW Kenya (Kasanzu, ; Kasanzu et al, ; Wagner et al, ). In some places, however, this pattern has been disrupted by Cretaceous and Paleogene episodes of rapid cooling associated with rift‐related denudation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rift Superposition on Lithospheric Response to East African Rift System Extension: Lapur Range, Turkana, Kenya

et al. 2018

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The Turkana Depression of northern Kenya lies at the intersection of the NW‐SE trending late Mesozoic‐early Paleogene South Sudan and Anza rifts and the N‐S trending late Paleogene‐Recent East African Rift System (EARS). A low‐temperature thermochronology study in the Lapur Range reveals a complex tectonothermal evolution related to multiple periods of regional and local tectonism. Zircon (U‐Th)/He data from Precambrian basement record rapid Early Cretaceous denudational cooling. Coeval subsidence in the adjacent Anza and South Sudan rifts (Morley, Bosworth, et al., 1999; Schull, 1988) suggests that the northern Turkana region acted as a basement high separating the grabens, as well as an axial source of sediment. Between ~95 and 90 Ma, a period of reheating commenced with burial of Lapur basement beneath ~500 m of Late Cretaceous‐Eocene Lapur Sandstone and ~1.5–3.5 km of latest Eocene‐early Miocene Turkana volcanics. Apatite fission track (AFT) and apatite (U‐Th‐Sm)/He data record a transition to rapid denudational cooling in the mid‐Miocene (~14 Ma) in response to EARS‐related extension in the northern Turkana Basin. Thermal history models indicate that the Lapur Range experienced ~90–100°C of mid‐Miocene to Plio‐Pleistocene cooling, yielding the first Neogene AFT ages reported from Kenya related to EARS exhumation. We attribute the larger magnitude of cooling in the Lapur Range compared to other regions of the EARS to the attenuated crustal thickness and elevated heat flow of the Turkana Depression, crustal properties inherited from earlier Cretaceous‐Paleogene rifting. The resulting low effective elastic thickness of the Turkana lithosphere allowed for increased isostatic footwall uplift in response to EARS extension.

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“…6) affected at least the SFC (Jelinek et al, 2014;Japsen et al, 2012 at the craton's continental margin) and Brasília Orogen (Fonseca et al, 2020). In the Matiqueira Province (Borba et al, 2002(Borba et al, , 2003Hueck et al, 2019;Machado et al, 2019;Oliveira et al, 2016;Ribeiro et al, 2005;Souza et al, 2014), Amazonian Craton (Harman et al, 1998) and ancient West Gondwana basement terrains in Africa (Kasanzu, 2017;Kasanzu et al, 2016), a Paleozoic cooling is also reported. The majority of the previous works argued for a far-field mechanism inducing widespread erosion and exhumation of the West Gondwana basement during this time (e.g.…”

Section: Paleozoicmentioning

confidence: 96%

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

et al. 2021

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The São Francisco Craton (SFC) and its marginal Araçuaí and Brasília orogens exhibit a significant diversity in their lithospheric architecture. These orogens were shaped during the Neoproterozoic-Cambrian amalgamation of West Gondwana. The rigid cratonic lithosphere of the SFC and the relatively weak lithosphere of the Araçuaí Orogen were disrupted during the Cretaceous opening of the South Atlantic Ocean, whereas the Brasília Orogen remained in the continental hinterland. In earlier research, the thermal effects of the Phanerozoic reactivations in the shallow crust of the Araçuaí Orogen have been revealed by low-temperature thermochronology, mainly by apatite fission track (AFT) analysis. However, analyses from the continental interior are scarce. Here we present new AFT data from forty-three samples from the Brasília Orogen, the SFC and the Araçuaí Orogen, far from the passive margin of the Atlantic coast (~150 to 800 km). Three main periods of basement exhumation were identified: (i) Paleozoic, recorded both by samples from the SFC and Brasília Orogen; (ii) Early Cretaceous to Cenomanian, recorded by samples from the Araçuaí Orogen; and (iii) Late Cretaceous to Paleocene, inferred in samples from all domains. We compare the differential exhumation pattern of the different geotectonic provinces with their lithospheric strengths. We suggest that the SFC likely concentrated the Meso-Cenozoic reactivations in narrow weak zones while the Araçuaí Orogen displayed a far-reaching Meso-Cenozoic deformation. The Brasília Orogen seems to be an example of a stronger orogenic lithosphere, inhibiting reworking, confirmed by our new AFT data. Understanding the role of the lithosphere rigidity may be decisive to comprehend the processes of differential denudation and the tectonic-morphological evolution over Phanerozoic events.

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Apatite fission track and (U-Th)/He thermochronology from the Archean Tanzania Craton: Contributions to cooling histories of Tanzanian basement rocks

Cited by 23 publications

References 38 publications

Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

Influence of Rift Superposition on Lithospheric Response to East African Rift System Extension: Lapur Range, Turkana, Kenya

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

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