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- W2048814957 abstract "Time and space relationships between Pan-African intrusives in the Iforas belt (northeast Mali) are discussed. On the basis of structures, lithological composition and plutonism, three domains have been defined. These are, from west to east: (1) the Tilemsi accretion domain; (2) the central domain characterized by an early Pan-African tectonism with large-scale basement nappes; and (3) the eastern domain, a later Pan-African trough deposited on continental basement. Domains (1) and (2) are separated by a huge complex batholith. Geochronological results confirm the structural distinctions and the existence of two major events. As shown by Rb/Sr isochron ages, domains (2) and (3) were stabilized 645 Ma ago. While the multistage evolution of the batholith can be bracketed between 614 and 570 Ma, RbSr biotite whole rock pairs give very similar ages which indicates a short time lapse between emplacement and cooling. The initial ratios, in the range 0.705–0.708 are, as in many other batholiths, slightly higher than the mantle growth curve, indicating a complex origin where crust and mantle are involved. As granitoids occupy some 60% of the surface area in the Iforas belt, the Pan-African epoch corresponds to an important crustal addition in the Iforas segment." @default.
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- W2048814957 date "1981-06-01" @default.
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- W2048814957 title "Pan-African granitoid emplacement in the adrar des Iforas mobile belt (Mali): A Rb/Sr isotope study" @default.
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- W2048814957 doi "https://doi.org/10.1016/0301-9268(81)90044-9" @default.
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