Architecture and Depositional Style of Fluvial Systems Before Land Plants&lt;subtitle&gt;A Comparison of Precambrian, Early Paleozoic, and Modern River Deposits&lt;/subtitle&gt;

Long, Darrel G.F.

doi:10.2110/sepmsp.097.037

Cited by 69 publications

(94 citation statements)

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“…The architectural elements and their makeup indicate a predominantly braided pattern within the fluvial system, similar to most of the Precambrian rivers (cf., Long, 2011;Sarkar et al, 2012). Evidence of bar-top reworking coupled with frequent occurrence of reactivation surfaces ( 35 flow regime facies argue against a wet palaeoclimate.…”

Section: Sequence Architecture and Discussionmentioning

confidence: 99%

“…The other type suggests migration of generally unitary bedforms (cf., Miall, 1985, Singh et al, 1993, Batson and Gibling, 2002, Miall and Jones, 2003and Long, 2011, although their tops may have been reworked and thereby incorporated components of different characters. The element manifests migration of dunes, transverse bars or bank attached bars (cf., Smith, 1970, Olsen, 1988, Reading, 1996, Best et al, 2003and Labourdette and Jones, 2007.…”

Section: Fluvial Architectural Elementmentioning

confidence: 99%

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Forced regressive wedge in the Mesoproterozoic Koldaha Shale, Vindhyan basin, Son valley, central India

Samanta

Mukhopadhyay

Eriksson

2016

Marine and Petroleum Geology

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The present paper highlights the sequence development within the Mesoproterozoic Koldaha Shale Member of the Kheinjua Formation, Vindhyan Supergroup which records the occurrence of a forced regressive wedge and associated discontinuity surfaces at the base of the wedge. Nine lithofacies have been identified within the study area that are grouped into three lithofacies associations varying in depositional setting from outer shelf, through shorefaceforeshore-beach to continental braidplain. The outer shelf sediments are aggradational to slightly progradational representing highstand systems tract. The rapidly progradational, wedge-shaped shoreface to foreshore-beach succession occurs sharply or erosively above the outer shelf sediments and is bounded by a regressive surface of marine erosion (RSME) at the base and by a subaerial unconformity at the top. This, along with its downstepping trajectory, supports deposition of this sedimentary wedge during falling sea level. A laterally extensive soft sediment deformation zone occurs at the base of the wedge.The forced regressive wedge is incised by fluvial braidplain deposits that rest on an erosive surface representing a sequence boundary. The thin braidplain deposits are the product of aggradation during a subsequent early rise in relative sea level, and thus, they are inferred to represent a lowstand systems tract. The constituent architectural elements that characterize the braidplain deposits are downstream accretion elements and small channel elements. Further 1 landward, the base and top of the shoreface wedge merge to form an unconformity across deposits that rest directly on the outer shelf sediments. The identification of forced regressive wedges has significant economic importance in view of the potential occurrence of hydrocarbons within the Proterozoic formations.

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Section: Sequence Architecture and Discussionmentioning

confidence: 99%

Section: Fluvial Architectural Elementmentioning

confidence: 99%

Forced regressive wedge in the Mesoproterozoic Koldaha Shale, Vindhyan basin, Son valley, central India

Samanta

Mukhopadhyay

Eriksson

2016

Marine and Petroleum Geology

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“…The preserved sedimentary record suggests that many rivers of the Precambrian and Early Palaeozoic adopted a 'sheetbraided' style formed by rapid channel switching and lateral migration of channels over kilometres of floodplain (Davies and Gibling, 2010). Precambrian meandering rivers have left a rare sedimentary record, with only a few known examples of sandbed or gravel-bed meanders and no proven examples of meandering rivers bounded by fine-grained floodplain deposits (Long, 2011). Precambrian rivers are characterized by sedimentary lithofacies that can be related to modern gravel and boulder beds forming in ephemeral braided systems and debris flows (Paszkowski and Shone, 1994;Long, 2011).…”

Section: Rivers In a World With A Complex Terrestrial Biospherementioning

confidence: 99%

Humans as the third evolutionary stage of biosphere engineering of rivers

et al. 2014

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We examine three fundamental changes in river systems induced by innovations of the biosphere, these being: 1) the evolution of oxygenic photosynthesis; 2) the development of vascular plants with root systems; and 3) the evolution of humans. Modern river systems are associated with extensive human trace fossils that show a developing complexity from ancient civilizations, through to the gigantic metro systems beneath rivers in modern megacities. Changes induced by humans rank in scale with those caused by earlier biosphere innovations at 2.4 and 0.416 Ga, but would geologically soon revert to a "pre-human" state were humans to become extinct.

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“…The necessary cohesion required to stabilize river banks 124 and floodplains, and to reduce chute cutoffs, can be achieved in the presence of silt-125 grade sediments, which can considerably reduce erosion rates (Peakall et al 2007; Van 126 Dijk et al 2013). Furthermore, vegetation alone is not wholly sufficient to induce 127 meandering (Gran & Paola 2001) and, although clay-grade sediments were apparently 128 rare in pre-vegetation times, silt-grade sediments were not (Long 2011 increased rate of accumulation of sediment is recorded in the Devonian (Fig. 4) as a 277 response to the Caledonian Orogeny (Ronov et al 1980).…”

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confidence: 99%

Tectonic and environmental controls on Palaeozoic fluvial environments: reassessing the impacts of early land plants on sedimentation

Santos

Mountney

Peakall

2016

JGS

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The apparent increase in occurrence of meandering fluvial channel systems in the Middle Palaeozoic has long been related to the effects of land-plant colonization. However, evidence for meandering channels in non-vegetated settings is shown by pre-vegetation successions on Earth, from the prevalence of meandering channels on Mars, from physical modelling of meandering channels, and from non-vegetated channels in modern desert basins. In addition, early land plants had small dimensions, were limited in their occurrence, and were dependent on environmental factors. Here, we question the capacity of early land plants to impose the major impacts suggested by current models. We propose that the sudden widespread occurrence on Earth of fluvial deposits indicative of the accumulation of meandering river systems in the Middle Palaeozoic was primarily an effect of environmental and tectonic conditions that prevailed during this period. These conditions induced a worldwide increase in the proportion of meandering rivers, which in turn helped favour the appropriate environment for land-plant colonization of the continents. We propose that land plants opportunistically took advantage of an appropriate global environment, which enabled them to thrive in continental environments. Fluvial environments characterized by single-channel systems and stable floodplains facilitated the greening of the land.

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Architecture and Depositional Style of Fluvial Systems Before Land Plants<subtitle>A Comparison of Precambrian, Early Paleozoic, and Modern River Deposits</subtitle>

Cited by 69 publications

References 0 publications

Forced regressive wedge in the Mesoproterozoic Koldaha Shale, Vindhyan basin, Son valley, central India

Forced regressive wedge in the Mesoproterozoic Koldaha Shale, Vindhyan basin, Son valley, central India

Humans as the third evolutionary stage of biosphere engineering of rivers

Tectonic and environmental controls on Palaeozoic fluvial environments: reassessing the impacts of early land plants on sedimentation

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