Presentation Information
[R8P-09]Metamorphic history of corundum-bearing high-pressure amphibolite from the Paleoproterozoic Usagaran Belt, Tanzania
*Rio Higuchi1, Tatsuki Tsujimori2, Nelson Boniface3 (1. Dept. Earth Sci., Tohoku Univ., 2. CNEAS, Tohoku Univ., 3. UDSM)
Keywords:
Usagaran Belt,Tanzania,continental collision,high-pressure amphibolite,granulitization
Corundum-bearing amphibolite occurs in a meta-cumulate body of the Paleoproterozoic Usagaran Belt, SE Tanzania. The studied rock has a compositional banding of amphibolitic and garnetititic layers; corundum occurs in both layers. Petrological studies of the rock revealed a decompression P–T trajectory that is characterized by corrosion of primally corundum at the rims by Mg–Al spinel. The replacement textures might suggest a partial granulitization of high-pressure amphibolite. This process might occur during the crustal stabilization after collisional event.
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