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Tracing the Source of the Elephant And Hippopotamus Ivory from ...

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Figure 57: White and Blue Nile drainage networks with detailed map <strong>of</strong> area between Esh<br />

Shawal and Khartoum. Numbers in paren<strong>the</strong>ses = modern Sr isotope ratios; solid<br />

triangles = fossil localities (Talbot et al. 2000: 343).<br />

literature for this region because <strong>of</strong> researchers’ interest in <strong>the</strong> unique geology <strong>of</strong> <strong>the</strong><br />

Kenya and Ethiopian rift valleys.<br />

Rogers et al. (2000) investigated <strong>the</strong> geology <strong>of</strong> <strong>the</strong> Kenya rift system which has a<br />

basement composed <strong>of</strong> three zones: <strong>the</strong> Archaean Tanzanian craton (TC), <strong>the</strong> late<br />

Proterozoic Pan-african Mozambique mobile belt (MB) and a zone <strong>of</strong> craton margin<br />

reactivated (remobalized) during <strong>the</strong> Pan-african orogeny (RCM) (see Figure 59 for map<br />

<strong>of</strong> <strong>the</strong>se zones). These basalts located along <strong>the</strong> axial regions <strong>of</strong> <strong>the</strong> Kenya Rift have Sr<br />

ratios <strong>of</strong> 0.7030 to 0.7055. Specifically, <strong>the</strong> TC and RCM have values ranging <strong>from</strong><br />

0.7035-0.7056 (or >0.7035), and <strong>the</strong> MB yields ratios <strong>from</strong> 0.7030-0.7035 (or

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