Paleogeography and Tectono-Stratigraphy of Carboniferous-Permian and Triassic ‘Karoo-Like’ Sequences of the Congo Basin - Geology and Resource Potential of the Congo Basin - page 125

(11.1) 1046 ±20 Ma

(2.1) 683 ±20 Ma (12.1) 846 ±35 Ma

(12.2) 757 ±24 Ma

(1.1) 1052 ±16 Ma

(3.1) 2621 ±13 Ma

(34.1) 657 ±20 Ma

(14.1) 2019 ±17 Ma

(13.1) 2688 ±15 Ma

(36.1) 599 ±21 Ma (15.1) 1047 ±84 Ma

(18.1) 1858 ±17 Ma (16.1) 2045 ±17 Ma

(17.1) 1047 ±19 Ma

(35.1) 1894 ±17 Ma

Fig. 7.13 Example of back-scattered electron ( left photo) and cathodoluminescence ( right photo) images of detrital zircons from sample D1595
(the Lukuga Group), with location of laser spots and U-Pb results

(5.1) 1399 ±65 Ma

(21.1) 974 ±12 Ma

(19.2) 711 ±14 Ma

(20.1) 954 ±12 Ma

(18.1) 753 ±8 Ma

(17.1) 900 ±15 Ma

(19.1) 795 ±36 Ma

(16.1) 1005 ±26 Ma

(22.1) 1018 ±37 Ma

Fig. 7.14 Example of back-scattered electron ( left photo) and cathodoluminescence ( right photo) images of detrital zircons from sample S2035
(the Haute Lueki Group), with location of laser spots and U-Pb results

7.4.3.3 Early Neoproterozoic to Mesoproterozoic
(850- 1400 Ma)
Early Neoproterozoic to Mesoproterozoic dates are abun-
dant in all the samples (Fig. 7.12 ), indicating important and
prolonged contributions from Kibaran-age sources to the
CB. Although only in the samples from the Lukuga Group,
5 zircons dated at 1.37 - 1.42 Ga coincide with the Kibaran
type-area along the eastern margin of the basin, recently
dated at 1375 Ma (Tack et al. 2010 ). Most other dates are
restricted between 950 and 1100 Ma (Figs. 7.12b, d ). The
largest potential primary sources for this 1 Ga zircon age-

population are within the Oubanguides to the north, in parti-
cular the central Sahara Belt in CAR and Chad (e.g. the
North African Shield; de Wit et al. 2014 in press), and on
the opposite side of the Atlantic within the Brasiliano
(Araguaia and Aracuai) Belts of northeastern Brazil (e.g.
Dos Santos et al. 2010 ). These northern provenances for
the CB are supported by other recent detrital zircons studies
(Frimmel et al. 2006 ; Jelsma et al. 2011 ) that also found
dominant 1 Ga age-populations within the upper Neo-
proterozoic to early Paleozoic West Congolian and Inkisi
Groups along the western margin of the basin. The Pan