The importance of coastal geomorphological setting as a controlling factor on microtextural...

Costa, Pedro; Silva, D. Rasteiro da; Figueirinhas, L.; Lario, Javier

doi:10.1344/geologicaacta2019.17.4

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Surface textures on quartz and heavy minerals have been commonly used to assess the transport and depositional mechanisms grains experienced throughout their sedimentary cycles in ancient and recent fluvial, marine and aeolian environments (Armstrong-Altrin & Pineda-Olmedo, 2014; Costa et al, 2013;Dott, 2003;Gravenor & Leavitt, 1981;Itamiya et al, 2019;Kasper-Zubillaga et al, 2005;Krinsley et al, 1976;Krinsley & Donahue, 1968;Madhavaraju et al, 2022;Mejía-Ledezma et al, 2020;Phillips-Lander et al, 2017). In contrast to quartz (Costa et al, 2019;Immonen, 2013;Krinsley & Doornkamp, 1973;Mahaney, 2002;Vos et al, 2014) and heavy minerals (Mejía-Ledezma et al, 2020;Moral-Cardona et al, 2005;Velbel et al, 2007;Velbel & Ranck, 2008), surface textures on pyroxene grains are reported to be useful as indicators of weathering and mechanical abrasion (Andò et al, 2012;Garzanti et al, 2015aGarzanti et al, , 2015bLe Pera & Morrone, 2020;Morrone et al, 2020;Schott et al, 1981;Velbel, 2007) in ancient and recent sands. Similar to other ferromagnesian minerals, pyroxene grains can be rare in sands due to their vulnerability to chemical weathering and diagenesis (Deer et al, 1992;Delvigne, 1990;Marsaglia, 1993;Schott et al, 1981;Velbel & Barker, 2008), but they are nonetheless commonly found in volcaniclastic sediments (Hamill & Ballance, 1985;Le Pera et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Surface textures of detrital pyroxenes in coastal dune sands (western Gulf of Mexico, Mexico): Implications for their preservation and geoenvironmental processes

Kasper‐Zubillaga

Martínez‐Serrano

Buchs

et al. 2023

The Depositional Record

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This work investigates how the surface textures and morphology of pyroxene grains evolve during their source‐to‐sink history. This study applies to detrital clinopyroxenes concentrated in coastal dune sands of the Gulf of Mexico which were sourced in the Trans Mexican Volcanic Belt then transported and deposited in environments subject to limited chemical weathering. The composition and morphology of the pyroxenes was characterised using single‐grain geochemical analysis and surface texture imagery with a novel approach based on the compactness property to assess the shape of minerals. This reveals heterogenous diopside‐augite populations, displaying mineral morphologies dominantly controlled by impact breakage along cleavages, little physical abrasion along their edges and with limited evidence for chemical weathering. Mechanical surface textures dominate over mechanical/chemical and chemical surface textures. These mechanical surface textures are preserved primarily as flat cleavage surfaces and rounded edges inherited from fluvial‐intertidal and aeolian transport, respectively. Mechanically/chemically induced surface textures are preserved as elongated depressions. Chemical surface textures are sparse and mostly represented by mammillated textures that suggest local dissolution under subaqueous conditions. The scarcity of chemical surface textures is attributed to frequent fragmentation of the clinopyroxenes along cleavages and limited chemical weathering during transport of the observed populations. Clinopyroxene grains in the coastal dune sands primarily retain surface characteristics from fluvial transport. Although the breakage of minerals along cleavages can obscure their original morphology under a weathering‐limited erosion regime, this study shows how surface textures and morphology of pyroxene grains is used to determine episodes of transport and deposition close to volcanic environments. The use of the compactness property as a shape descriptor measurement of particles provides an alternative approach to observe how clinopyroxene remains unaltered despite the high energy conditions of the coastal area.

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Section: Introductionmentioning

confidence: 99%

Surface textures of detrital pyroxenes in coastal dune sands (western Gulf of Mexico, Mexico): Implications for their preservation and geoenvironmental processes

Kasper‐Zubillaga

Martínez‐Serrano

Buchs

et al. 2023

The Depositional Record

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Grain-size analysis and quartz surface microtextures observations of sediments from Jijelian East coast, Algeria: sedimentary environment implications

Kermani

Boutiba

2023

J. Sediment. Environ.

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Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa

Molén

Smit²

2022

Geologos

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The Gondwana Late Palaeozoic Ice Age is probably best represented by the Dwyka Group in South Africa. Striated and grooved surfaces or pavements are commonly considered to have formed subglacially, as are diamictites which have been interpreted as in-situ or reworked tillites. These interpretations were tested by investigation of outcrops in formerly well-studied areas, throughout South Africa. Detailed analyses have focused on striated surfaces/pavements and surface microtextures on quartz sand grains in diamictites. The sedimentological context of four pavements, interpreted to be glaciogenic, display features commonly associated with sediment gravity flows, rather than glaciation. A total of 4,271 quartz sand grains were subsampled from outcrops that are considered mainly to be tillites formed by continental glaciation. These grains, analysed by SEM, do not demonstrate the characteristic surface microtexture combinations of fracturing and irregular abrasion associated with Quaternary glacial deposits, but mainly a mix of surface microtextures associated with multicyclical grains. The Dwyka Group diamictites warrant reinterpretation as non-glacial sediment gravity flow deposits.

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The importance of coastal geomorphological setting as a controlling factor on microtextural...

Cited by 3 publications

References 13 publications

Surface textures of detrital pyroxenes in coastal dune sands (western Gulf of Mexico, Mexico): Implications for their preservation and geoenvironmental processes

Surface textures of detrital pyroxenes in coastal dune sands (western Gulf of Mexico, Mexico): Implications for their preservation and geoenvironmental processes

Grain-size analysis and quartz surface microtextures observations of sediments from Jijelian East coast, Algeria: sedimentary environment implications

Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa

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