New (U-Th)/He titanite data from a complex orogen-passive margin system

A case study from northern Mozambique

Friederike U. Bauer, Joachim Jacobs, Benjamin U. Emmel, Matthijs Van Soest

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

New titanite (U-Th)/He (He) data on basement rocks from NE Mozambique are presented. The objective was to test the applicability of titanite He thermochronology in an orogen-passive margin setting and to better constrain the exhumation history across the Lurio Belt, a major structural discontinuity in Mozambique. Therefore, samples from existing geochronological and thermochronological studies were dated using titanite He thermochronology. Resulting titanite He data (from abraded crystals) provide average cooling ages from 178 ± 15 to 383 ± 23 Ma. The data fit well into the age pattern obtained from previous thermochronological studies in NE Mozambique, revealing differential exhumation across the Lurio Belt. The basement to the north experienced earlier cooling than that to the south, while overall youngest titanite He ages are from the Lurio Belt, indicating reactivation linked to the post-collisional extension and break-up of Gondwana. Thermal history modelling revealed two possibilities, able to account for the different cooling histories of NE Mozambique since initial Gondwana break-up in Permian times: One involves a transient sedimentary overburden that buried and (re)heated the southern basement, with subsequent basin inversion at ~250 Ma in response to rift shoulder uplift. The second model implies delayed cooling of the southern basement, possibly due to delamination of the crustal root shortly after Gondwana formation. The formerly upwelling asthenosphere and the subsequently formed sag basin might have caused a prolonged thermal effect. Titanite He ages and thermal histories point to rift shoulder uplift of the southern part and increased thermal activity within the reactivated Lurio Belt, signifying first rifting activities as precursor of Gondwana break-up.

Original languageEnglish (US)
Pages (from-to)56-69
Number of pages14
JournalJournal of African Earth Sciences
Volume120
DOIs
StatePublished - Aug 1 2016

Fingerprint

titanite
passive margin
Gondwana
cooling
thermochronology
history
exhumation
uplift
crustal root
delamination
asthenosphere
basement rock
temperature effect
reactivation
basin
overburden
rifting
discontinuity
upwelling
Permian

Keywords

  • Exhumation history Mozambique
  • Gondwana break-up
  • Orogen-passive margin system
  • Thermal history modelling
  • Titanite (U-Th)/He thermochronology

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

New (U-Th)/He titanite data from a complex orogen-passive margin system : A case study from northern Mozambique. / Bauer, Friederike U.; Jacobs, Joachim; Emmel, Benjamin U.; Van Soest, Matthijs.

In: Journal of African Earth Sciences, Vol. 120, 01.08.2016, p. 56-69.

Research output: Contribution to journalArticle

Bauer, Friederike U. ; Jacobs, Joachim ; Emmel, Benjamin U. ; Van Soest, Matthijs. / New (U-Th)/He titanite data from a complex orogen-passive margin system : A case study from northern Mozambique. In: Journal of African Earth Sciences. 2016 ; Vol. 120. pp. 56-69.
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