Pisolithic ferricretes around the Cretaceous-Palaeocene boundary in southern Sardinia (Italy) as palaeoenvironmental proxies

Murru, Marco; Ferrara, Carmen; Matteucci, Ruggero; Pelo, Stefania Da; Sarria, E.; Vacca, Andrea

doi:10.1016/j.crte.2010.12.002

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…Iron‐oxide that secondarily forms in sediments, including ferricrete, is widely developed in various environments and present in many geological ages (Murru et al, ; Tanner & Khalifa, ; Théveniaut, Quesnel, Wyns, & Hugues, ). It contains a record of paleoclimatic change, from which it should be possible to reconstruct climate (Azmon & Kedar, ; Beauvais, ; Poage, Sjostrom, Goldberg, Chamberlain, & Furniss, ; Sjostrom, Hren, & Chamberlain, ).…”

Section: Introductionmentioning

confidence: 99%

A discontinuity in the late Pleistocene alluvial deposits, Hwacheon‐ri, Gyeongju, Korea: Occurrences and paleoenvironmental implication

et al. 2018

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A sedimentary discontinuity is present in the late Pleistocene alluvial deposits exposed along the cliff in stream side, Gyeongju, Korea. Sedimentological study, Optically Stimulated Luminescence (OSL) age dating, and X‐ray diffraction (XRD), and X‐ray fluorescence spectrometer (XRF) analyses were conducted in order to interpret the origin of the discontinuity surface. Based on the sedimentological study, these deposits can be divided into three distinct stages, in ascending order: (Stage 1) development of a braided stream flowing from south to north and deposition by debris flows from the mountain aside the stream during and/or after deposition of the braided stream; (Stage 2) deposition by intermittent events during a state of stagnation after the abandonment or migration of the previously existed braided stream; and (Stage 3) deposition of gravels from debris flows from the mountain aside the stream. Hornfelsic gravels are common in Stage 1, whereas andesitic gravels are predominant in Stage 3, suggesting the provenance change from Stage 1 to Stage 3. The discontinuity surface is laterally extensive and marked by a distinct carbonaceous dark grey horizon between Stage 2 and Stage 3. It is characteristic that rootlets mineralized by vivianite are present, and iron‐oxide crusts are cutting across irregularly below the discontinuity surface. It is thus interpreted that the shift of depositional environment from an alluvial plain (Stage 2) (125 ka) to an alluvial fan (Stage 3) (94–55 ka) was an alluvial response to sea level change from the interglacial to the glacial. The development of iron‐oxide crusts and diagenetic vivianite in the discontinuity surface suggests humid condition persisted during the paleoclimatic shift from the last interglacial to the last glacial stages.

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Section: Introductionmentioning

confidence: 99%

A discontinuity in the late Pleistocene alluvial deposits, Hwacheon‐ri, Gyeongju, Korea: Occurrences and paleoenvironmental implication

et al. 2018

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Origin of ferruginous coated grains in the Lower Jurassic palustrine limestones of the Pranhita–Godavari Basin, India

Datta,

Sain,

Goswami

et al. 2024

The Depositional Record

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The formation of calcareous coated grains like ooids and oncoids have been extensively researched. In contrast, the origin and genesis of ferruginous coated grains are less clear. Radically different processes like surficial weathering, hydrothermal exhalation and microbial activity have been advocated for the source of iron and the development of coatings. Modern examples are sparse and from marine environments affected by igneous activity. This study presents the features of ferruginous coated grains found in freshwater lacustrine–palustrine deposits of the Lower Jurassic syn‐rift strata of the Pranhita–Godavari Basin, India. The coated grains occur in metre‐thick lenticular bodies of nodular limestones enclosed in black mudstones containing plant debris and sulphates (gypsum and baryte). In the nodular limestones, sand‐size coated grains, along with chert and quartz grains, float in a micritic groundmass. Angular quartz grains embedded in dark, amorphous haematite–goethite constitute the nuclei of the coated grains. Cortices comprise numerous, thin, wavy laminae of goethite with trapped detrital grains. These coated grains are typically devoid of carbonates, although the outermost part of the cortex is replaced by calcite spars to varying extent. The black mudstone‐nodular limestone association occurs in between siliciclastic lacustrine deposits (laminated red and green mudstones) below, and the palustrine limestones‐green shale association above. The palustrine limestones contain remains of aquatic organisms, evidence of desiccation, paedogenesis, microbial‐mat formation, chert, baryte and gypsum layers. A few decimetre‐scale, wedge‐shaped, flood‐derived cross‐bedded sandstones occur locally. Due to the proximity of the depositional area to the marginal fault system of the rift basin and association of the limestones containing coated grains with sub‐aerially weathered microbialites, these ferruginous coated grains are ideally poised for a comparative assessment of various hypotheses of solute supply and precipitation. Based on field, microscopic and chemical characteristics, it is possible to conclude that microbially mediated precipitation in hydrothermal (hot spring)‐influenced pools is the most probable origin for these ferruginous coated grains.

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Sardinia and the Alpine cycle: A tectono-sedimentary history at the Western Tethys edge

Costamagna

2023

Earth-Science Reviews

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Pisolithic ferricretes around the Cretaceous-Palaeocene boundary in southern Sardinia (Italy) as palaeoenvironmental proxies

Cited by 5 publications

References 34 publications

A discontinuity in the late Pleistocene alluvial deposits, Hwacheon‐ri, Gyeongju, Korea: Occurrences and paleoenvironmental implication

A discontinuity in the late Pleistocene alluvial deposits, Hwacheon‐ri, Gyeongju, Korea: Occurrences and paleoenvironmental implication

Origin of ferruginous coated grains in the Lower Jurassic palustrine limestones of the Pranhita–Godavari Basin, India

Sardinia and the Alpine cycle: A tectono-sedimentary history at the Western Tethys edge

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