Journal article

AN EARLY CRETACEOUS PHASE OF ACCELERATED EROSION ON THE SOUTH-WESTERN MARGIN OF AFRICA - EVIDENCE FROM APATITE FISSION-TRACK ANALYSIS AND THE OFFSHORE SEDIMENTARY RECORD

RW BROWN, DJ RUST, MA SUMMERFIELD, AJW GLEADOW, MCJ DEWIT

NUCLEAR TRACKS AND RADIATION MEASUREMENTS | PERGAMON-ELSEVIER SCIENCE LTD | Published : 1990

Abstract

Apatite fission track ages and confined track length distributions have been determined for rock samples from the south-western continental margin of Africa. The apatite ages fall into two groups, one having early Cretaceous ages and mean confined track lengths of ≈ 14 μm with very few short tracks, and the other having older ages with confined track length distributions containing a significant proportion of strongly annealed tracks ( < 10 μm). In any particular area the older apatite ages only occur above a critical threshold elevation, forming a regional pattern in the data and indicating cooling of the upper few kilometers of the crust during the early Cretaceous. This episode of cooling..

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