Pleistocene mass-flow deposits of basaltic hyaloclastite on a shallow submarine shelf, South Iceland

1991 ◽  
Vol 53 (8) ◽  
pp. 597-611 ◽  
Author(s):  
Steffen G Bergh ◽  
Gudmundur E Sigvaldason
Keyword(s):  
Mass Flow ◽  
Mass Flow Deposits

Depositional Environments of Plant Bearing Sediments

1988 ◽  
Vol 3 ◽  
pp. 1-13 ◽  
Author(s):  
Scott L. Wing
Keyword(s):  
Mass Flow ◽  
Depositional Environments ◽  
Fluvial Systems ◽  
Volcanic Origin ◽  
Sedimentary Environments ◽  
Plant Remains ◽  
Mass Flow Deposits ◽  
Fluvial Environments

Plants can become incorporated into the sediments of virtually any environment, from the oozes of abyssal plains to the silts and sands of delta fronts to brecciated mudflows of volcanic origin. However there is a much narrower range of sedimentary environments in which identifiable plant remains are found in abundance. Generally speaking these are the very shallow or subaerial portions of deltas and estuaries, the channels and floodplains of fluvial systems, lakes of all sizes, ash-falls, and mass-flow deposits such as mudflows. For the purposes of this paper peat swamps are considered as unusual subtypes of deltaic and fluvial environments in which clastic input is low relative to organic accumulation.

scholarly journals Middle and Late Jurassic radiolarians from the Neotethys suture in the Eastern Alps

2016 ◽  
Vol 91 (1) ◽  
pp. 25-72 ◽  
Author(s):  
Luis O’Dogherty ◽  
Špela Goričan ◽  
Hans-Jürgen Gawlick
Keyword(s):  
Mass Flow ◽  
Late Jurassic ◽  
Eastern Alps ◽  
Accretionary Wedge ◽  
Taxonomic Study ◽  
New Genera ◽  
Two New Species ◽  
Mass Flow Deposits ◽  
Thermal Overprint ◽  
Radiolarian Assemblages

AbstractCherty limestones, marls and radiolarites are widespread in the Hallstatt Mélange of the Northern Calcareous Alps. The mélange was formed during the Neotethyan orogeny in a series of deep-water basins that progressively developed in front of the advancing nappe front. The low thermal overprint of these rocks favors the good preservation of radiolarians (polycystines) that have been used for dating and reconstructing the Jurassic tectonostratigraphy of the area. This paper describes rich Middle–Late Jurassic radiolarian faunas from four localities in the Hallstatt Mélange near Bad Mitterndorf in Austria. Two different successions, both spanning from the Bathonian to the Oxfordian, are dated. In the first succession, the radiolarites are intercalated between or occur as matrix in mass-flow deposits originating from the accretionary wedge. The second succession is nearly 100 m thick but is devoid of mass-flow deposits and documents a continuous radiolarite deposition in greater distance from the nappe stack. Both successions are ascribed to the Sandlingalm Basin, which evolved on a relatively distal continental margin during early stages of the orogeny.The highly diverse and well-preserved radiolarian assemblages have been used for a detailed taxonomic study. Two new families are described: Minocapsidaen. fam. andXitomitridaen. fam.; six new genera are describedDoliocapsan. gen.,Crococapsan. gen.,Parvimitrellan. gen.,Xitomitran. gen.,Campanomitran. gen., andMizukidellan. gen. In addition, one new replacement name,Takemuraella(proTriversus), is introduced, the diagnoses of 6 genera are emended, and two new species are described:Hemicryptocapsa nonagintan. sp. andMizukidella mokaensisn. sp.

Brachiopods from the Palaeogene clastic deposits of north-western Italy

2020 ◽  
Vol 298 (2) ◽  
pp. 165-176
Author(s):  
Maria Aleksandra Bitner ◽  
Alfred Uchman ◽  
Bruno Rattazzi
Keyword(s):  
Mass Flow ◽  
First Record ◽  
Fan Deltas ◽  
Stratigraphic Ranges ◽  
Mass Flow Deposits ◽  
Nw Italy ◽  
North Western ◽  
Geological Context

Four brachiopod species, i. e. Erymnaria bolcensis ( Massalongo , 1850), Gryphus cf. minor (Philippi, 1836), Terebratulina tenuistriata (Leymerie, 1846), and Megathiris detruncata (Gmelin, 1791) have been identified in the Oligocene deposits of NW Italy. The species G. cf. minor and T. tenuistriata dominate in the studied material. This is the first record of M. detruncata from the Oligocene of Italy, although it has been noted both from the Eocene and Miocene of Italy. The stratigraphic ranges of E. bolcensis and T. tenuistriata have been extended. The studied assemblage differs considerably from the majority of the Palaeogene and Neogene assemblages of Europe dominated by micromorphic megathyridids. Geological context and sedimentary features point to mass-flow deposits of fan deltas, indicating that the assemblage has been transported within the sediment down a slope.

Sign in / Sign up

Export Citation Format

Share Document