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Mantle evidence for ancient relict and juvenile crustal formation in the Arabian-Nubian Shield, a Neoproterozoic accretionary orogen

Kuo-Lung Wang  Suzanne O'Reilly  Ryuichi Shinjo  William Griffin  Norman Pearson  Risa Matsumura  
【摘要】:正The highly siderophile elements(HSE)and Os isotope compositions of individual sulfide grains in spinel lherzolites hosted by Quaternary alkali basalts from Turkana Depression,Southern Ethiopia,reveal the presence of Proterozoic subcontinental lithospheric mantle(SCLM)beneath the plume-driven continental rift setting in East Africa.Most sulfides are Fe-rich monosulfide solid solution(MSS)with minor Ni-rich MSS,pentlandite and chalcopyrite.Some Ethiopian sulfides show high Os and Ir abundance and similar HSE patterns as typical residual MSS worldwide,whereas fewer sulfides have lower Os and Ir abundances than typical residual MSS and have HSE patterns within the range of typical sulfide melts.Most of the sulfides

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