Abstract
Comparison of grain-size modes as seen in size-frequency curves for tonalite source and derived sediment shows that grain-size characteristics of this particular sediment are not inherited from its source. Size-frequency distributions from thin section measurements of 470 tonalite grains show a primary grain-size mode at 0.72 mm, with secondary modes at 1.35, 0.34, and 0.20 mm. Silicate sediments formed by fragmentation of the tonalite have grain-size modes, as determined by sieving, that do not match grain-size modes of in situ tonalite. Nontransported weathered tonalite (6 samples) has a dominant grain-size mode at 1.7 mm; beach sediment (15 samples) has modes at about 4.0 and 0.23 mm; and submarine fragmented tonalite sediment (17 samples) has a major grain-size mode at 0.16 mm. Corresponding grain-size modes at about 0.2 mm for fragmented tonalite and biogenic carbonates, and differences in mineralogy of the 0.2 mm mode between in situ tonalite and derivatives suggest the 0.2 mm mode in sediment is th...
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call