Arido-eustasy: A new example of non-glacial eustatic sea level change

Brikiatis, Leonidas

doi:10.1016/j.gr.2018.12.012

Cited by 7 publications

(19 citation statements)

References 72 publications

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“…According to the arido-eustasy 42 and the aquifer-eustasy 92 , 93 models of sea-level change, dry global climates seem to correspond to sea-level rises and wet global climates correspond to sea-level falls. Accordingly, the long-term high sea-level trend that characterised the Carboniferous–Permian transition could coincide with a long-term dry period; this may have caused the reported rainforest collapse event (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Annexation of the most detailed Capitanian δ 13 C carb record available allowed for precise palaeoenvironmental interpretations under the recently proposed arido-eustasy model 42 . Of particular importance is the chronological definition of the upper boundary of the Russian Severodvinian Stage, which currently is not dated precisely 43 .…”

Section: Synthesis Of the Middle Permian Biochronostratigraphic Chartmentioning

confidence: 99%

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An early Pangaean vicariance model for synapsid evolution

Brikiatis¹

2020

Sci Rep

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Genetic isolation due to geographic separation (vicariance) is the best understood cause of vertebrate speciation. nevertheless, it has never been demonstrated in the fossil record across a wide range of taxa. Here, by reviewing in-depth the available data of the Late Palaeozoic (~ 350-250 million years ago), i reconstructed an early pangaean junction-disjunction palaeogeographic model and showed that it coincides strongly with time-calibrated cladograms of the Late palaeozoic synapsids (the primitive ancestors of modern mammals). the temporal development of the vicariant topology seems to fit closely with the emergence rhythm of the recovered synapsid taxa, suggesting vicariance due to pangaean separation as the cause of early amniote evolution. the inferred vicariant topology also accounts for the observed pattern in the north American marine biostratigraphic units. Accordingly, the model demonstrates the link between the evolution of life on earth and palaeogeographic evolution and strongly supports allopatric speciation through vicariance as the prominent mode of amniote evolution. furthermore, correlations between state-of-the-art biochronostratigraphic charts and this palaeogeographic model suggest that the arido-eustasy model can explain the mid-permian biotic extinction event and depositional cycles, such as the pre-Zechstein of the central european Basin. Vicariance is the geographical separation of previously sympatric populations due to the development of geographical and/or ecological barriers to gene flow 1. Through vicariance, conspecific populations become genetically isolated and subsequently accumulate different mutations that render them reproductively incompatible resulting in the creation of new species 2. One common way for temporally heterogeneous geographic barriers to form is via eustatic sea-level changes that produce seaways on low profile intercontinental land bridges 3. Accordingly, transgressive stages, which occur when sea-levels are high, are expected to coincide with vicariance of the terrestrial biota, whereas regressive stages, which occur when sea-levels are low, are expected to coincide with geodispersals, and the opposite pattern is expected for marine biota 4. To verify a vicariance pattern, a junction-disjunction palaeogeographic model must correlate with phylogenetic topologies of multiple taxa 5. Although vicariance is the best understood mode of speciation 1,2 , due to the absence of detailed scenarios of palaeogeographic changes and sufficiently resolved and representative phylogenetic trees, allopatric speciation has not been confirmed for a wide range of taxa in the vertebrate fossil record. Based on the most apparent episodes of sea-level change that affected the southern connections between the Uralian Seaway (URS) and the Palaeotethys, an early Pangaean junction-disjunction palaeogeographic model was reconstructed and compared to time-calibrated consensus cladograms ("clado-stratigraphic patterns") of Late Palaeozoic vertebrates to determine whether a vicariance pat...

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Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of the Middle Permian Biochronostratigraphic Chartmentioning

confidence: 99%

An early Pangaean vicariance model for synapsid evolution

Brikiatis¹

2020

Sci Rep

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“…These negative excursions in the terrestrial-sourced δ 13 C org are subsequently linked to short-term and initial marine transgressions (Laurin et al 2019). Brikiatis (2019) proposes the 'arido-eustasy model' which, based on palaeoenvironmental information from carbon isotope record variations, produces anti-covariation patterns of marine organic (wood) and carbonate carbon-isotope records to identify and explain 'non-glacial' (i.e. aquifereustatic, short-term) sea-level fluctuations .10 m during greenhouse periods of the last 200 myr.…”

Section: Sea-levelmentioning

confidence: 99%

“…Similarly, the rationale for the new term 'arido-eustasy' (Brikiatis 2019), and its logical relationship with other terms such as glacio-, aquiferand thermo-eustasy, must be considered. The 'arido-eustasy model' (Brikiatis 2019) is based on an anti-covariation pattern in the geochemical record of marine organic and marine carbonate carbon isotopes (using different markers), resulting from orbitally controlled climate-state shifts from extremely humid ('wet') to arid climate states and vice versa, on short-term timescale shifts during greenhouse phases of the last 200 myr (but see also the section 'Carbon isotope evolution and the carbon cycle', and Laurin et al 2019). Brikiatis (2019, p. 29) states that 'the model proposes that sea-level changes [sic!]…”

Section: Icehouse Greenhousementioning

confidence: 99%

“…The model is demonstrated by several Mesozoic examples, regarding the Cretaceous (Brikiatis 2019, see especially supplementary material therein), including the late Cenomanian (OAE 2), or Bonarelli-Event, and three late Aptian Events. The main limit for an application of this model to larger intervals of the Mesozoic is the lack of sufficient qualitative and quantitative resolution of the geochemical record (Brikiatis 2019). As stated above (in the section 'Definitions and overview') we here consider 'arido-eustasy' as a subcategory of aquifer-eustasy (cf.…”

Section: Sea-levelmentioning

confidence: 99%

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Aquifer-eustasy as the main driver of short-term sea-level fluctuations during Cretaceous hothouse climate phases

Sames

Wagreich

Conrad

et al. 2020

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A review of short-term (,3 myr: c. 100 kyr to 2.4 myr) Cretaceous sea-level fluctuations of several tens of metres indicates recent fundamental progress in understanding the underlying mechanisms for eustasy, both in timing and in correlation. Cretaceous third-and fourth-order hothouse sea-level changes, the sequencestratigraphic framework, are linked to Milankovitch-type climate cycles, especially the longer-period sequencebuilding bands of 405 kyr and 1.2 myr. In the absence of continental ice sheets during Cretaceous hothouse phases (e.g. Cenomanian-Turonian), growing evidence indicates groundwater-related sea-level cycles: (1) the existence of Milankovitch-type humid-arid climate oscillations, proven via intense humid weathering records during times of regression and sea-level lowstands; (2) missing or inverse relationships of sea-level and the marine δ 18 O archives, i.e. the lack of a pronounced positive excursion, cooling signal during sealevel lowstands; and (3) the anti-phase relationship of sea and lake levels, attesting to high groundwater levels and charged continental aquifers during sea-level lowstands. This substantiates the aquifer-eustasy hypothesis. Rates of aquifer-eustatic sea-level change remain hard to decipher; however, reconstructions range from a very conservative minimum estimate of 0.04 mm a −1 (longer time intervals) to 0.7 mm a −1 (shorter, probably asymmetric cycles). Remarkably, aquifer-eustasy is recognized as a significant component for the Anthropocene sealevel budget.

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A major orbito-hyetal event at the middle-to-late Oxfordian transition (Late Jurassic)

Brikiatis¹

2023

Marine and Petroleum Geology

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Arido-eustasy: A new example of non-glacial eustatic sea level change

Cited by 7 publications

References 72 publications

An early Pangaean vicariance model for synapsid evolution

An early Pangaean vicariance model for synapsid evolution

Aquifer-eustasy as the main driver of short-term sea-level fluctuations during Cretaceous hothouse climate phases

A major orbito-hyetal event at the middle-to-late Oxfordian transition (Late Jurassic)

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