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SUBMARINE FLOOD TUFFS (IGNIMBRITES) ASSOCIATED WITH TURBIDITES IN OLIGOCENE DEPOSITS OF RHODES ISLAND (GREECE)
Author(s) -
MUTTI E.
Publication year - 1965
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1965.tb01562.x
Subject(s) - geology , pyroclastic rock , submarine , turbidity current , turbidite , volcanism , submarine volcano , tectonics , volcanic ash , group (periodic table) , structural basin , geochemistry , volcano , pyroclastic fall , paleontology , geomorphology , petrology , sedimentary depositional environment , explosive eruption , oceanography , chemistry , organic chemistry
SUMMARY Two pyroclastic sheet‐like deposits were found by the author between the stratigraphic sequence of marine Oligocene sediments of the Vati Group (Rhodes Island, Greece). The lower one is described in this paper. Its uniform thickness over a large area suggests an origin from submarine ash flow. This assumption is also supported by some welding phenomena observed in several thin sections. Submarine eruption of ignimbritic type is advocated to account for these properties. This type of volcanism agrees well with tectonic and paleogeo‐graphic evolution of the Vati Group basin. Strong analogies and relationship between submarine ash flows (gaseous suspension) and turbidity currents (watery suspension) are pointed out. The new term of “igniturbidites” is proposed to characterize some pyroclastic turbidity current deposits genetically related to submarine ash flows. The paleogeographic reconstruction of the Vati Group basin gives some information about the location of the volcanic eruption area and about the submarine travelling of the ash flows.