Criteria for the identification of ventifacts in the geological record: A review and new insights

Durand, Marc; Bourquin, Sylvie

doi:10.1016/j.crte.2013.02.004

Cited by 18 publications

(11 citation statements)

References 78 publications

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“…It shows less than ten metres of lateral extension before it disappears due to erosion. It is developed in areas of transition between fluvial to aeolian dominance (Kocurek and Nelson, 1986;Brookfield, 1992;Tripaldi and Limarino, 2008;Durand and Bourquin, 2013). The restricted sediment supply in these transitional areas could be responsible for the lateral development of these lowrelief morphologies (Mountney, 2006), while the variation of wind speed would favour the transition between plane-bed lamination and wind-ripple strata.…”

Section: Aeolian Sedimentary Environmentsmentioning

confidence: 97%

The beginning of the Buntsandstein cycle (Early–Middle Triassic) in the Catalan Ranges, NE Spain: Sedimentary and palaeogeographic implications

Galán-Abellán

López-Gómez

Barrenechea

et al. 2013

Sedimentary Geology

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Section: Aeolian Sedimentary Environmentsmentioning

confidence: 97%

The beginning of the Buntsandstein cycle (Early–Middle Triassic) in the Catalan Ranges, NE Spain: Sedimentary and palaeogeographic implications

Galán-Abellán

López-Gómez

Barrenechea

et al. 2013

Sedimentary Geology

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“…However, shallow subsurface exploration showed that there is no bedrock to weather, that is, down to 40 cm depth. Based on the literature (Parsons and Abrahams, 1984;Svintsov, 2009;Durand and Bourquin, 2013), such reg-type sites form by in situ weathering and fragmentation of bedrock along with deflation of finegrained products. However, this is not probable here as the bedrock was missing, and thus, in situ weathering could have contributed only in an unusual way (the mixed emergence of other formation methods might contribute and the very long timescale of formation also could make the formation process and the explanation unusual).…”

Section: Shallow Subsurface Explorationmentioning

confidence: 99%

Mars-Relevant Field Experiences in Morocco: The Importance of Spatial Scales and Subsurface Exploration

et al. 2018

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During field work at the Ibn Battuta Mars analogue sites, two research questions were analyzed: (1) How do we identify sampling sites using remote and local imaging and (2) what kind of information can be gained from shallow subsurface exploration? While remote images help in targeting field activities in general, the connection between observations at different spatial scales for different rocky desert terrain types is not well established; in this, focused comparison of remote in situ images of well-selected analogues would help a great deal. Dried up lake beds as discerned in remotely acquired data may not show signatures of past water activity, while shallow subsurface exploration could reveal the lacustrine period. Acquisition of several satellite images of the same terrain under different geometries would help to support the planning of such in situ work. The selection of appropriate sampling sites in fluvial settings could be improved by analyzing long, meter-high, open-air outcrops that formed during most recent fluvial episodes. Such settings are abundant on Earth and could be present on Mars but may be just below the resolution of available data. By using 20-30-cm-deep excavations, shallow subsurface exploration could reveal the last period of geological history that would have been unattainable by surface observation alone. Aggregates embedded in the original strata or from heavily pulverized samples could not be identified; only weakly fragmented samples viewed right after acquisition showed aggregates, and thus, the close-up imager (CLUPI) on the ExoMover might provide information on cementation-related aggregation on the observing plate before crushing. The mechanical separation of different size grains (mainly clays and attached minerals) would also support the identification of individual components. To maximize context information during subsurface exploration, rover imaging should be accomplished before crushing; however, currently planned imaging may not be ideal for this.

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“…The reason for the CIA, CIA*, or CIA-K proxies being less sensitive to palaeoclimate changes in the here studied sections might be best explained by already chemically weathered, preaccumulated Permian siliciclastic debris before its final transport and sedimentation. Late Permian-Early Triassic phases of non-sedimentation, leading to enhanced chemical weathering of the pre-accumulated debris, are documented in the Central European Basin by Early Triassic aeolianites such as occurrences of ventrifacts (e.g., Durand and Bourquin, 2013), aeolian facies architectures like dunes, 'pin-stripe sands' (e.g., Maaß et al, 2010), and single, well rounded, coarse quartz grains as well as patchy distributed, silty to sandy dust (e.g., Hug, 2004). The final Early Triassic transport might be triggered either by tectonic pulses or by changes in palaeoclimate conditions.…”

Section: Major-elementsmentioning

confidence: 99%

A multistratigraphic approach to pinpoint the Permian-Triassic boundary in continental deposits: The Zechstein–Lower Buntsandstein transition in Germany

Scholze

Wang

Kirscher

et al. 2017

Global and Planetary Change

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The Central European Basin is very suitable for high-resolution multistratigraphy of Late Permian to Early Triassic continental deposits. Here, the well exposed transition of the lithostratigraphic Zechstein and Buntsandstein Groups of central Germany was studied for isotope-chemostratigraphy (δ 13 Corg, δ 13 Ccarb, δ 18 Ocarb), major-and trace-element geochemistry, magnetostratigraphy, palynology, and conchostracan biostratigraphy. The analyzed material was obtained from both classical key sections (abandoned Nelben clay pit, Caaschwitz quarries, Thale railway cut, abandoned Heinebach clay pit) and a recent drill core section (Caaschwitz 6/2012) spanning the Permian-Triassic boundary. The Zechstein-Buntsandstein transition consists of a complex sedimentary facies comprising sabkha, playalake, aeolian, and fluvial deposits of predominantly red-colored siliciclastics and intercalations of lacustrine oolitic limestones. The new data on δ 13 Corg range from-28.73 ‰ to-21.67 ‰ showing multiple excursions. Strongest negative shifts correlate to single intercalations of oolites and gray-colored clayey siltstones, while isotopically more heavy shifts correspond to an onset of palaeosoil overprint. The δ 13 Ccarb range from-9.69 ‰ to-1.34 ‰ with strongest variations recorded in dolomitic nodules from the Zechstein Group. A correlation of δ 18 Ocarb-values with the carbonate content is interpreted to reflect diagenesis. In contrast to sedimentary facies shifts across the Zechstein-Buntsandstein boundary, majorelement values used as proxy (CIA, CIA*, CIA-K) for palaeoclimate conditions indicate climatic stability. Trace-element data used for a geochemical characterization of the Late Permian to Early Triassic transition in central Germany indicate a decrease in the Rb at the Zechstein-Buntsandstein boundary.New palynological data obtained from the Caaschwitz quarry section reveal occurrences of Late Permian palynomorphs in the Lower Fulda Formation, while Early Triassic elements were recorded in the upper part of the Upper Fulda Formation. The present study confirms an onset of a normal-polarized magnetozone in the Upper Fulda Formation of the Caaschwitz quarry section supporting an interregional correlation of this crucial stratigraphic interval with the normal magnetic polarity of the basal Early Triassic known from marine sections in other regions. Based on a synthesis of the multistratigraphic data, the Permian-Triassic boundary is proposed to be placed in the lower part of the Upper Fulda Formation, which is biostratigraphically confirmed by the first occurrence date of the Early Triassic Euestheria gutta-Palaeolimnadiopsis vilujensis conchostracan fauna. Rare records of conchostracans reported from the siliciclastic deposits of the lower to middle Zechstein Group may point to its potential for further biostratigraphic subdivision of the Late Permian continental deposits.

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Criteria for the identification of ventifacts in the geological record: A review and new insights

Cited by 18 publications

References 78 publications

The beginning of the Buntsandstein cycle (Early–Middle Triassic) in the Catalan Ranges, NE Spain: Sedimentary and palaeogeographic implications

The beginning of the Buntsandstein cycle (Early–Middle Triassic) in the Catalan Ranges, NE Spain: Sedimentary and palaeogeographic implications

Mars-Relevant Field Experiences in Morocco: The Importance of Spatial Scales and Subsurface Exploration

A multistratigraphic approach to pinpoint the Permian-Triassic boundary in continental deposits: The Zechstein–Lower Buntsandstein transition in Germany

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