olistostrome


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olistostrome

[ə′lis·tə‚strōm]
(geology)
A sedimentary deposit composed of a chaotic mass of heterogeneous material that is intimately mixed; accumulated in the form of a semifluid body by submarine gravity sliding or slumping of unconsolidated sediments.
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Here, there are no Palaeozoic materials, although carbonated sediments--nearly pure limestone, olistostrome and dolomite--occur with turbidite, gaps, marl, clay and sandstone.
One area, the Bisoni-McKay, at the south end of the Fish Creek Range, displays an olistostrome, shed eastward during the Late Devonian (early Famennian) from a migrating Antler orogenic forebulge.
The Western Precordillera is characterized by olistostrome or melange deposits, related to extensional tectonics during Ordovician times, in a continent-ocean transition (von Gosen, 1992; Astini, 1997; Keller, 1999; Alonso et al., 2008a) and ocean floor sediments with pillow basalts in the westernmost part (Kay et al., 1984; Gonzalez-Menendez et al., 2013).
The promontary of Quepos is made of Paleocene pelagic limestones and basalts covered with Middle-Upper Eocene olistostrome and detrital sequences (Baumgartner et al., 1984).
Structure and evolution of the 'olistostrome' complex of the Gibraltar Arc in the Gulf of Cadiz (eastern Central Atlantic): evidence from two long seismic cross-sections.
The Western Precordillera is characterised by Cambrian-Ordovician olistostrome or melange deposits related to extensional tectonics in a continent-ocean transition (Astini, 1997; Keller, 1999), and ocean floor-like sediments with pillow basalts in the westernmost part (Kay et al., 1984), indicating the existence of an ancient continental margin (e.g.
Ashbum), then unconformably by Eocambrian(?) grey sandstone with conglomerate or olistostrome of Simonton Corners (=?
The allochthonous Silurian--Devonian in olistostromes at "the Southern Variscan front" (Tinerhir region, SE Morocco)--Preliminary data.
10) including calciturbidites and olistostromes (mega debris flows) containing olistoliths (clasts) as large as automobiles.
Okay describe an Upper Eocene olistostromal sequence with ophiolitic clasts and large blocks of Eocene limestone in the southern Thrace basin, and the Eocene olistostromes in terms of the origin of the Thrace basin, its development during the Eocene, and the evolution of the Intra-Pontide suture (Okay et al., 2010).
In Baja California parts of the same unit occur as olistolithes (Permian limestone) in the Upper Triassic San Hipolito Formation at San Hipolito (Rangin, 1984), and as olistostromes (Permian limestone) in the Upper Triassic of the area of El Volcan (Radelli, 1993 and references there).
It was also demonstrated that the common association of 'tillites and carbonates' was the product of active tectonic settings in which non-glacial marine mass flows were interbedded with olistostromes, debris flows and turbidites composed of detrital, reworked carbonate (Schermerhorn, 1974).