Archaean crustal growth through successive partial melting events in an oceanic plateau-like setting in the Tanzania Craton

Sanislav, Ioan V., Blenkinsop, Thomas G., and Dirks, Paul H.G.M. (2018) Archaean crustal growth through successive partial melting events in an oceanic plateau-like setting in the Tanzania Craton. Terra Nova, 30 (3). pp. 169-178.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://doi.org/10.1111/ter.12323
 
1


Abstract

The detrital zircon population in quartzitic conglomerates from the northern Tanzania Craton yield ages between 2640 Ma and 2790 Ma which includes most of the igneous history from this part of the craton. The igneous evolution is characterised by mafic volcanism with an oceanic plateau-like geochemical signature at ~2800 Ma followed by diorite and tonalite–trondhjemite–granodiorite dominated magmatism between 2790 and 2700 Ma, which transitioned into more evolved high-K magmatism between 2700 and 2620 Ma. The εHf values of the detrital zircons range from +2.4 to -1.4 and change with time from radiogenic Hf pre-2700 Ma (98% positive εHf) to unradiogenic Hf post-2700 Ma (41% positive εHf). The petrological progression from mafic to felsic crust is reflected in the detrital age distribution and εHf isotopes and is consistent with juvenile mafic crust slowly maturing into more evolved felsic crust through a series of successive partial melting events in an oceanic-plateau-like environment.

Item ID: 52665
Item Type: Article (Refereed Research - C1)
ISSN: 1365-3121
Funders: Geita Gold Mine, AngloGold Ashanti
Date Deposited: 27 Feb 2018 03:57
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 20%
04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 40%
04 EARTH SCIENCES > 0403 Geology > 040313 Tectonics @ 40%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
Downloads: Total: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page