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Geochemistry of the Palaeoproterozoic volcanic and associated potassic granitic rocks of the Ngualla area of the Ubendian Belt, SW Tanzania
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Number of Authors: 4
2017 (English)In: Journal of African Earth Sciences, ISSN 1464-343X, E-ISSN 1879-1956, Vol. 129, 291-306 p.Article in journal (Refereed) Published
Abstract [en]

The Ngualla area of the Lupa terrane in the Ubendian Belt of SW Tanzania is underlain by well-preserved greenschist facies calc-alkaline volcanic rocks which have been intruded by low-Sr, peraluminous K-rich granites. The Ngualla volcanic rocks are subdivided into four groups: the basaltic andesitestrachyandesites, Group I porphyritic dacites-trachytes, Group II porphyritic dacites-trachytes, and rhyolites. The basaltic andesites-trachyandesites were emplaced at similar to 1943 Ma and their most primitive members are characterized by MgO contents of up to 7.43 wt % at a SiO2 content of 54.0 wt %, Ni contents of up to 170 ppm and Mg# of up to 62. They show fractionated REE patterns (La/YbcN = 11.5-36.5), subchondritic Zr/Hf (37.8-43.9) and Nb/Ta (7.14-20.0) ratios, epsilon Nd (1943 Ma) values of 3.33 to 6.24 and TOM ages of 2521-2883 Ma. These geochemical features are consistent with derivation of the basaltic andesites-trachyandesites by at least 0.1% partial melting of garnet peridotite mantle, followed by 50 -80% fractional crystallization involving the removal of 61% clinopyroxene, 20% hornblende, 4% plagioclase and 15% orthopyroxene. The magmas were contaminated by Neoarchaean crustal materials incorporated in the Ubendian Belt during their ascent to the surface. The evolution of these magmas led to the formation of Group I porphyritic dacites-trachytes and rhyolites in a Palaeoproterozoic continental arc setting. The Group II porphyritic dacites-trachytes (1871 5 Ma) were coevally emplaced with the low-Sr, peraluminous K-granites (1878 15 Ma) forming a felsic plutonic-volcanic suite. Despite some differences, these rocks share geochemical features including negative Eu anomalies (mean Eu/Eu* = 0.19 for the dacites and 0.5 for the granites) and eNd (1871 Ma) values of -5.72 for the dacites and eNd (1878 Ma) values of -6.00 to -11.2 for the granites. These geochemical features are consistent with the generation of the similar to 1.87 Ga Ngualla felsic plutonic -volcanic suite by partial melting of heterogeneous Neoarchaean crust at low pressure conditions in the stability field of plagioclase in an intracontinental setting along a sutured margin. The 1.89-1.87 Ga felsic plutonic -volcanic suite also occurs in the Ndembera area of the Usagaran belt to the SW. Our results corroborate previous evidence that the Palaeoproterozoic regional K-granitic magmatism that affected parts of the Ubendian and Usagaran belts was caused by a regional thermal anomaly that was induced by large scale magmatic underplating that precipitated widespread crustal anatexis.

Place, publisher, year, edition, pages
2017. Vol. 129, 291-306 p.
Keyword [en]
Paleoproterozoic, Ubendian Belt, Ngualla area, Basaltic andesites-trachyandesites, Plutonic-volcanic suite
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-144871DOI: 10.1016/j.jafrearsci.2017.01.022ISI: 000401399100023OAI: oai:DiVA.org:su-144871DiVA: diva2:1117017
Available from: 2017-06-28 Created: 2017-06-28 Last updated: 2017-06-28Bibliographically approved

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