Facies Sequences and Geometries in Continental Volcaniclastic Sediments

Smith, Gary A.

doi:10.2110/pec.91.45.0109

Cited by 105 publications

(164 citation statements)

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“…In contrast, volcaniclastic facies suggest reworking of ash-fall materials by surface processes and admixture with epiclastic materials (e.g. Smith, 1991;Orton, 1996). The sheet-like shape and the dominance of massive bodies points to unconfined sheet-flood episodes that remobilized pyroclastic materials (Cas and Wright, 1987;Umazano et al, 2012) (Table 2).…”

Section: Facies Association 11: Pyroclastic and Volcaniclastic Deposimentioning

confidence: 99%

“…The alternation of ash-fall deposits with reworked tuffs and nonpyroclastic deposits through the succession suggests episodic sedimentation in which the volcanic influence was important. Major sedimentation would have taken place during episodes of intense volcanism (syn-eruptive periods); when volcanism decreased or ceased (inter-eruptive period), erosion and reworking dominate the system (Smith, 1991).…”

Section: Pyroclastic and Volcaniclastic Sedimentation At Rinc On Del mentioning

confidence: 99%

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Paleoenvironmental reconstruction of the coastal Monte Léon and Santa Cruz formations (Early Miocene) at Rincón del Buque, Southern Patagonia: A revisited locality

Raigemborn

Matheos

Krapovickas

et al. 2015

Journal of South American Earth Sciences

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a b s t r a c tSedimentological, ichnological and paleontological analyses of the Early Miocene uppermost Monte Le on Formation and the lower part of the Santa Cruz Formation were carried out in Rinc on del Buque (RDB), a fossiliferous locality north of Río Coyle in Santa Cruz Province, Patagonia, Argentina. This locality is of special importance because it contains the basal contact between the Monte L eon (MLF) and the Santa Cruz (SCF) formations and because it preserves a rich fossil assemblage of marine invertebrates and marine trace fossils, and terrestrial vertebrates and plants, which has not been extensively studied. Ã 90 m-thick section of the MLF and the SCF that crops out at RDB was selected for this study. Eleven facies associations (FA) are described, which are, from base to top: subtidaleintertidal deposits with Crassotrea orbignyi and bioturbation of the Skolithos-Cruziana ichnofacies (FA1); tidal creek deposits with terrestrial fossil mammals and Ophiomorpha isp. burrows (FA2); tidal flat deposits with Glossifungites ichnofacies (FA3); deposits of tidal channels (FA4) and tidal sand flats (FA5) both with and impoverish Skolithos ichnofacies associated; marsh deposits (FA6); tidal point bar deposits recording a depauperate mixture of both the Skolithos and Cruziana ichnofacies (FA7); fluvial channel deposits (FA8); fluvial point bar deposits (FA9); floodplain deposits (FA10); and pyroclastic and volcaniclastic deposits of the floodplain where terrestrial fossil mammal remains occur (FA11).The transition of the MLFeSCF at RDB reflects a changing depositional environment from the outer part of an estuary (FA1) through the central (FA2e6) to inner part of a tide-dominated estuary (FA7). Finally a fluvial system occurs with single channels of relatively low energy and low sinuosity enclosed by a broad, low-energy floodplain dominated by partially edaphized ash-fall, sheet-flood, and overbank deposits (FA8e11). Pyroclastic and volcaniclastic materials throughout the succession must have been deposited as ash-fall distal facies in a fluvial setting and also were carried by fluvial streams and redeposited in both estuarine and fluvial settings. These materials preserve most of the analyzed terrestrial fossil mammals that characterize the Santacrucian age of the RDB's succession. Episodic sedimentation under volcanic influence, high sedimentation rates and a relatively warm and seasonal climate are inferred for the MLF and SCF section.Lateral continuity of the marker horizons at RDB serve for correlation with other coastal localities such as the lower part of the coastal SCF south of Río Coyle (~17.6e17.4 Ma) belonging to the Estancia La Costa Member of the SCF.

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Section: Facies Association 11: Pyroclastic and Volcaniclastic Deposimentioning

confidence: 99%

Section: Pyroclastic and Volcaniclastic Sedimentation At Rinc On Del mentioning

confidence: 99%

Paleoenvironmental reconstruction of the coastal Monte Léon and Santa Cruz formations (Early Miocene) at Rincón del Buque, Southern Patagonia: A revisited locality

Raigemborn

Matheos

Krapovickas

et al. 2015

Journal of South American Earth Sciences

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“…Este campo del conocimiento científico es de particular interés para comprender las características del paisaje, la tectónica, las alteraciones climáticas, y los procesos de erosión y acumulación en las cuencas sedimentarias donde la actividad volcánica ha tenido un rol preponderante. En este marco, es muy frecuente la actividad de procesos catastróficos sineruptivos, tales como deslizamientos, avalanchas y flujos de detritos (Smith, 1991;Tanner y Hubert, 1991;Brown et al, 2009), considerados de importancia en la evolución de los cuerpos volcánicos (Glicken, 1991;Palmer y Neall, 1991). Uno de los aspectos que también resulta de interés en este contexto de interacción volcánico/sedimentaria es la influencia de estos procesos en la evolución del registro sedimentario de las cuencas, particularmente cuando se produce el crecimiento de edificios volcánicos sincrónico con el proceso de relleno de las cubetas sedimentarias.…”

Section: Introductionunclassified

Procesos gravitacionales-fluviales y preservación de vegetación boscosa en un área volcánica: Formación Rancahué (Oligoceno), Andes neuquinos, Argentina

Spalletti

Veiga

Franzese

2013

Andgeo

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“…Long, 1978Long, , 2002Eriksson et al, 1998). Frequent volcanism has a profound effect on fluvial depositional systems (Smith, 1991;Kataoka and Nakajo, 2002). For example, the sudden influx of voluminous volcanic and volcaniclastic material into a restricted basin can create resistant barriers and may have pronounced effect on the sediment dispersal patterns and depositional sequences (Kuenzi et al, 1979;Mueller et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

Mazumder

Sarkar

2004

Precambrian Research

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The Palaeoproterozoic Dhanjori Formation, eastern India is a terrestrial (dominantly fluvial) volcano-sedimentary succession. Basal conglomerate, coarse-grained sandstone, and shale rests directly on the granite basement and represents the distal fringe of an alluvial fan complex. Sieve, sheet flood, mass flow and alluvial channel and overbank deposits comprise the fan segment. The rest of the formation is entirely constituted by fining upward fluvial cycles. An event of basin tilting and volcanic eruption intervened and resulted a second phase of Dhanjori sedimentation, although the general fluvial depositional framework remained unaltered. The two members of the Dhanjori Formation display different paleocurrent trends related to fluvial response to basin tilting. In the lower member spatial variability in paleocurrent directions occurs as a consequence of fan development. Unlike the first phase, the second phase of fluvial deposition incorporates profuse volcanics and accompanying volcaniclastic deposits. These volcanic and volcaniclastic rocks might have locally blocked the river courses resulting in short-lived lacustrine deposition. Composition of the volcanics varies upward from ultramafic to mafic. The Dhanjori volcanism took place in an intracontinental rift setting as is evident from the interbedded terrestrial deposits. Interbedded volcanic and volcaniclastic rocks in different stratigraphic levels suggest episodic volcanic eruption. A semiarid paleoclimate is proposed and is consistent with development of an alluvial fan comprised of coarse clastic deposits.

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Facies Sequences and Geometries in Continental Volcaniclastic Sediments

Cited by 105 publications

References 0 publications

Paleoenvironmental reconstruction of the coastal Monte Léon and Santa Cruz formations (Early Miocene) at Rincón del Buque, Southern Patagonia: A revisited locality

Paleoenvironmental reconstruction of the coastal Monte Léon and Santa Cruz formations (Early Miocene) at Rincón del Buque, Southern Patagonia: A revisited locality

Procesos gravitacionales-fluviales y preservación de vegetación boscosa en un área volcánica: Formación Rancahué (Oligoceno), Andes neuquinos, Argentina

Sedimentation history of the Palaeoproterozoic Dhanjori Formation, Singhbhum, eastern India

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