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JOURNAL OF SEDIMENTARY PETROLOGY, VOL. 47, No.4 (1977), 1542-1553

SEDIMENTARY FILLINGS OF ANCIENT DEEP-SEA CHANNELS: TWO EXAMPLES FROM NORTHERN APENNINES (ITALY)

I. PETER MARTINI1 and MARIO SAGRI2

1Department of Land Resource Science, University of Guelph, Guelph, Ontario, Canada
2Centro Geologia Strutturale e Minerogenesi dell'Appennino CNR, Universita di Firenze, Firenze, Italy

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image_14.jpg (1636552 ืึฝฺ)To try and determine the significance of thinning-upward sequences, two turbidite sections in the Monte Modino Formation (Oligocene, Northern Apennines, Italy) were studied. The two sections are geographically and stratigraphically several hundred meters apart. One section, consisting of a geometrically definable channel cut into an olistrostrome contains thinning-upward sequences. The second section comprises thinning-upward cycles that alternate with portions of the sequence with no regular changes in bed thickness. Comparison of these Oligocene rocks with modern deep- sea deposits and subaerial fans suggests that thinning-upward sequences may form in channels and valleys which need not necessarily be erosional ones. Thus, these sequences may indicate shifts of thalweg of flows as a response to partial plugging of depressions.

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