Liquefaction features interpreted as seismites in the Pleistocene fluvio-lacustrine deposits of the Neuquén Basin (Northern Patagonia)

Moretti, Massimo; Ronchi, Ausonio

doi:10.1016/j.sedgeo.2010.09.014

Cited by 83 publications

(46 citation statements)

References 30 publications

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“…When it is preserved, lamination is curved along the borders of load-structures and often shows vertical water-escape features (flame structures of Kelling and Walton, 1957) occurring between adjacent load-structures ( Fig.9 a, b and c). Within the deformed layers there are no flat surfaces indicating the occurrence of different deformation events, which would be indicating that the entire deformed thickness was disturbed by a single seismic event (Moretti and Ronchi, 2011). In these deformed beds, load cast, ball and pillow structures stand out by their significant size.…”

Section: U-pb Determinations and Recognized Progressive Unconformitiementioning

confidence: 99%

The North Patagonian orogenic front and related foreland evolution during the Miocene, analyzed from synorogenic sedimentation and U/Pb dating (∼42°S)

Ramos

Tobal

Sagripanti

et al. 2015

Journal of South American Earth Sciences

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Section: U-pb Determinations and Recognized Progressive Unconformitiementioning

confidence: 99%

The North Patagonian orogenic front and related foreland evolution during the Miocene, analyzed from synorogenic sedimentation and U/Pb dating (∼42°S)

Ramos

Tobal

Sagripanti

et al. 2015

Journal of South American Earth Sciences

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“…a few hundred meters), and no major change in thickness. The deformed beds display all the characteristics of seismites (Bowman et al 2004;Moretti and Ronchi 2011), which are in situ deformed beds that formed as a consequence of earthquakes in the basement. An important additional argument for the interpretation of these deposits as seismites, is that structures such as loadcasts of different scale, ball and pillow structures and flame structures, resulted from liquefaction inside the beds (Fig.…”

Section: Interpretation Of the Facies And Facies Associationsmentioning

confidence: 96%

Changes in the biota and sediments of glacial Lake Koźmin, Poland, during the late Saalian (Illinoian)

Pawłowski

Gruszka

Gallas³

et al. 2013

J Paleolimnol

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Upper Saalian (Illinoian) glaciolacustrine deposits in central Poland, preserved in a tectonic graben, were exposed in an opencast lignite mine and investigated using sedimentological and micro-paleontological methods. The extraglacial lake sediments provide the first records of late Saalian cladoceran communities in central Europe, recovered from glaciolacustrine deposits. Sedimentation was dominated by a supply of clastics that fluctuated with the seasons, forming rhythmites. In addition to seasonal cyclicity, sedimentary and environmental conditions changed every several years to decades, with periods of increased inflow to the lake delivering sandy material, and periods of almost stagnant water dominated by suspension settling. The sediments contain Cladocera assemblages that indicate the lake was initially deep, oligotrophic, and filled with moderately cold water. Changes in Cladocera community composition and abundance were perhaps responses to climate seasonality. Zones without Cladocera were associated with seasons of higher inflow and sediment supply, and directly or indirectly, with tectonic activity in the graben. Earthquakes, documented by the presence of seismites, caused not only deformation of unconsolidated lake-bottom sediments, but possibly also changes in habitat characteristics. Combined sedimentological and biological data were used to infer the lake's history and show that deposits of glaciolacustrine lakes can be used as indicators of past ecological and climate changes.

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“…While Van Loon et al explain the deformation process, one question omitted is whether there is any evidence of liquefaction and fluidization in the underlying strata, such as sedimentary dykes, chaotic lamination, massive features, and load structures (e.g., Alfaro et al, 2002;Zhang et al, 2007;Chen et al, 2009bChen et al, , 2011Berra and Felletti, 2011;Moretti and Ronchi, 2011;Ross et al, 2011;Chen and Lee, 2013). In fact, however, these features have never been found in the underlying strata in spite of such many levels of breccias.…”

Section: Source Of "Fountains"mentioning

confidence: 99%

Origin of the Furongian limestone breccias in the North China Platform

Chen

2015

Sci. China Earth Sci.

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Limestone breccias are a common phenomenon in the Cambrian successions worldwide. They bear important geological implications that have attracted geologists for several decades. There are, however, still controversies on their origins, especially those of the breccias with abundant vertically orientated clasts. The Furongian (upper Cambrian) Chaomidian Formation of the North China Platform contains numerous levels of limestone breccias and conglomerates that provide an excellent example to look into their formative processes. These breccias and conglomerates have been the focus of study and discussion since the 1980s, but yet there is still no consensus with respect to their geneses. Recently, Van Loon and others argued that the vertically orientated clasts of the breccias developed by a number of simultaneous "fountains" on the paleo-seafloor; the "fountains" formed by upward-directed fluidized flows originated from the sediment underlying the brecciated limestones. While the novel "fountain" hypothesis is not impossible, based on field evidences and theoretical considerations, however, it is most likely that the vertically orientated clasts resulted from their re-orientation by upward flow of thixotropically liquidized, uncemented argillaceous sediment that was interbedded with brecciated limestone fragments. Besides, the deformation processes most likely took place under shallow burial. limestone breccia, flat-pebble conglomerate, soft-sediment deformation, early diagenesis, Cambrian Citation:Chen J T. 2015.

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Liquefaction features interpreted as seismites in the Pleistocene fluvio-lacustrine deposits of the Neuquén Basin (Northern Patagonia)

Cited by 83 publications

References 30 publications

The North Patagonian orogenic front and related foreland evolution during the Miocene, analyzed from synorogenic sedimentation and U/Pb dating (∼42°S)

The North Patagonian orogenic front and related foreland evolution during the Miocene, analyzed from synorogenic sedimentation and U/Pb dating (∼42°S)

Changes in the biota and sediments of glacial Lake Koźmin, Poland, during the late Saalian (Illinoian)

Origin of the Furongian limestone breccias in the North China Platform

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