Geochemistry and Geochronology of a Neoproterozoic Low-K Tholeiite-Boninite Association in Central Eritrea
The N-S trending Neoproterozoic volcano-sedimentary-plutonic associations in Eritrea are part of the Arabian-Nubian Shield. In Central Eritrea, the dominant rocks are low-grade supracrustal volcanic rocks with subordinate sedimentary rocks. They are intruded by pre- to syn-kinematic diorites and tonalites, as well as late- to post-kinematic granites. The low-K tholeiitic metavolcanic rocks range in composition from basalt to rhyolite. The low-K tholeiites (K2O = 0.03-0.40 wt.%) represent...[Show more]
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