Development of cavernous sediment in a non-beach environment

Stieglitz, Ronald D.; Inden, Richard F.

doi:10.1306/74d71c5d-2b21-11d7-8648000102c1865d

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this hypothesis, fenestral pores are interpreted as resulting from the effect of rainfall. This formation process has been observed in modern coastal dunes (Emery, 1945;Frébourg et al, 2008) and in a subaerial dam spillway (Stieglitz & Inden, 1969), and also reproduced experimentally (Bain & Kindler, 1994). Fenestrae have also been described from aeolianites of Holocene (Loucks & Ward, 2001;Engel et al, 2015) and Pleistocene age (Bain & Kindler, 1994;Frébourg, 2010).…”

Section: Introductionsupporting

confidence: 68%

Upper Pleistocene parabolic ridges (i.e. ‘chevrons’) from the Bahamas: Storm‐wave sediments or aeolian deposits? A quantitative approach

et al. 2021

View full text Add to dashboard Cite

The Upper Pleistocene (Marine Isotope Stage 5e; ca 120 ka) stratigraphic record from the Bahamas comprises large, kilometre-long parabolic ridges of oolitic composition, that point landward, and have been up to now called 'chevrons'. A debate about their genesis has led previous researchers to consider two processes of deposition: (i) a catastrophic event involving giant storm-generated waves produced by specific climatic conditions at the end of Marine Isotope Stage 5e; and (ii) a more uniformitarian process which characterizes 'chevrons' as aeolian parabolic dunes because of their similar morphology. Since there are few unequivocal sedimentological criteria to discriminate aeolian from water-deposited sediments, only a quantitative, multi-method approach could provide enough evidence to produce a viable diagnosis on the genetic processes involved. Following this reasoning, the quantification of the morphological parameters of 'chevrons', a precise study of their sedimentary structures on previously and newly discovered sections, and several statistical grain-size analyses, all advocate for an aeolian origin. Moreover, when the aforementioned characteristics of 'chevrons' are compared with those of storm deposits (for example, washovers) and parabolic dunes occurring elsewhere on Earth, the dissimilarity with the former and the resemblance with the latter is evident. Amino-acid racemization dating, together with stratigraphic and petrographic investigations, constrain the age of the 'chevrons' to the late part of Marine Isotope Stage 5e. Their occurrence during this specific time interval can be explained by both strengthened easterly winds and drier climatic conditions associated with changing vegetation cover. Fixation of the arms by sparse vegetation, coupled with the loose 'chevron' nose sediment migrating farther inland, form the peculiar U-shaped morphology of these ridges.

show abstract

Section: Introductionsupporting

confidence: 68%

Upper Pleistocene parabolic ridges (i.e. ‘chevrons’) from the Bahamas: Storm‐wave sediments or aeolian deposits? A quantitative approach

et al. 2021

View full text Add to dashboard Cite

show abstract

“…High-elevation fenestrae have been observed in eolianites of early MIS 5e, middle Pleistocene, and Holocene age in the Bahamas (Engel et al, 2015), which disagrees with Hearty et al (1998) who restricted these features to the late MIS 5e chevrons and runup deposits. Stieglitz and Inden (1969) had already interpreted fenestrae within a spillway as the results of heavy rains. Moreover, Kindler andStrasser (2002, 2000) observed pin-stripe laminations in the run-up deposits and chevron ridges, and argued that such extensive, mm-thin lamina with an erosive base, that show an inverse grain-size grading in well-sorted sands devoid of gravel-size debris of marine origin, are typical eolian features.…”

Section: Eolian Hypothesismentioning

confidence: 99%

Chevrons: origin and relevance for the reconstruction of past wind regimes

Vimpere¹,

Kindler²,

Castelltort³

2022

Preprint

View full text Add to dashboard Cite

Since its first use in the late 80’s, the term chevron has been employed in numerous studies to describe large U- and V-shaped ridges found in or near shorelines worldwide. Most studies have so far focused on Bahamian chevrons that are exclusively of Late Pleistocene age, and on the supposed Holocene chevrons found in S-Madagascar and Australia. In the Bahamas, these deposits have been interpreted as the product of extreme storms at the end of the last interglacial (LIG) warm period. In contrast, the extensive chevrons complex exposed in S-Madagascar and on the western coast of Australia have been associated with a tsunami induced by a meteorite impact. Finally, several authors have also proposed a non-catastrophic (i.e. eolian) origin based on the recognized importance of wind-related processes in these coastal areas, and term such deposits parabolic dunes. In this paper, we collect and synthesize existing data on the morphology, sedimentology and age of these chevrons, and review the different interpretations proposed in the literature with the aim to lay out a consistent database to assist further investigations on these important coastal morphologies. In addition, we generated a synthesis of wind data at the three study areas, which highlights the relationship between present wind regimes and chevrons morphologies. The ubiquity of chevrons (likely actually parabolic dunes) in coastal areas around the globe and their relationship with coastal processes makes them crucial archives for reconstructing past wind regimes.

show abstract

“…They most commonly occur in the intertidal zone but have been recognized in terrestrial settings (Stieglitz and Inden, 1969;Bain, 1985;Kindler, 1991;Bain and Kindler, submitted) and also underwater. Shinn (1983) observed such voids within a Holocene hardground at a depth of 7 m on the Bahama Platform, off New Providence Island.…”

Section: Significance Of Fenestraementioning

confidence: 99%

Submerged upper Holocene beachrock on San Salvador Island, Bahamas: implications for recent sea-level history

Kindler

Bain

1993

Geol Rundsch

View full text Add to dashboard Cite

Sedimentological, petrographic and radiometric data from a submerged beachrock on San Salvador Island, Bahamas, provide new information about the Late Holocene sea-level history in this area.At French Bay, on the southern shore of the island, samples of beachrock collected at a depth of 1 m below low tide level yielded an average 14C age of 965 + 60 years before present. These samples further display a well developed fenestral porosity and present an early generation of low Mg calcite meniscus cement. These features characterize intertidal and supratidal settings; they are not consistent with the present beachrock position and the reported Late Holocene sea-level history in the Bahamas. A 1 . 5 -2 m low stand of the sea about 1 000 years ago would best explain the observed particularities of the French Bay beachrock.This example from San Salvador shows that the smooth trend of Late Holocene sea-level rise proposed by previous workers might be overprinted by high frequency, low amplitude fluctuations. Recognition of these fluctuations is fundamental when calculating rates of sea-level rise and evaluating the coastal response to a marine transgression.

show abstract

Development of cavernous sediment in a non-beach environment

Cited by 7 publications

References 0 publications

Upper Pleistocene parabolic ridges (i.e. ‘chevrons’) from the Bahamas: Storm‐wave sediments or aeolian deposits? A quantitative approach

Upper Pleistocene parabolic ridges (i.e. ‘chevrons’) from the Bahamas: Storm‐wave sediments or aeolian deposits? A quantitative approach

Chevrons: origin and relevance for the reconstruction of past wind regimes

Submerged upper Holocene beachrock on San Salvador Island, Bahamas: implications for recent sea-level history

Contact Info

Product

Resources

About