Palaeoweathering events recorded on siliciclastic continental deposits (Albian, Lower Cretaceous) in NE Spain

Yuste, Alfonso; Camacho, Ivo; Bauluz, Blanca; Mayayo, María José; Laita, Elisa

doi:10.1016/j.clay.2020.105598

Cited by 8 publications

(6 citation statements)

References 38 publications

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“…The subhedral to euhedral and occasional pseudohexagonal morphologies of the platy kaolinite crystals of the bauxite matrix indicate that kaolinite is authigenic and not detrital, since erosion and transport processes would have modified them (Fig. 4; e.g., Bauluz et al 2014;Yuste et al 2015Yuste et al , 2020Laita et al 2020). The kaolinite booklets are also indicative of an authigenic origin, as this morphology is not robust enough to survive any significant transport.…”

Section: Formation Of Ck Bauxites: Insights From Mineralogy and Geochemistrymentioning

confidence: 99%

“…Furthermore, the apparent growth of kaolinite and gibbsite between the sheets of detrital micas also suggests that both kaolinite and gibbsite have been formed in situ. Therefore, the association of authigenic phases, such as kaolinite and gibbsite associated with Fe and Ti oxides, suggests that all were formed in situ as a consequence of pedogenic processes that enabled the autochthonous bauxite formation (e.g., Bauluz et al 2014;Yuste et al 2015Yuste et al , 2020. These bauxites and their representative mineral associations formed during warm and humid tropical to sub-tropical climate that promoted intense chemical weathering with the dissolution of primary silicate minerals (e.g., the observed micas) and crystallization of aluminium-rich phases and oxides (Muggler et al 2007;Eggleton et al 2008;Fernández-Caliani and Cantano 2010;Huang et al 2012;Bauluz et al 2014;Yuste et al 2015Yuste et al , 2020Singh and Srivastava 2018).…”

Section: Formation Of Ck Bauxites: Insights From Mineralogy and Geochemistrymentioning

confidence: 99%

“…To define the genesis and age of Central Dalmatian karst bauxites underlying DLSB deposits, we present a multiproxy approach applied on bauxites from the Crveni Klanac (CK) section. To resolve if the CK bauxites were formed in situ (autochthonous), or were deposited as the result of recycling of older bauxite horizons, we integrated mineralogical, textural, morphological and geochemical analyses of several bauxite horizons (e.g., Huang et al 2012;Mongelli et al 2014;Yuste et al 2015Yuste et al , 2020Kelemen et al 2017Kelemen et al , 2020Singh and Srivastava 2018;Sinisi 2018). These data also yield significant interpretations about the parental affinity and post-genetic modifications for the CK bauxites.…”

Section: Introductionmentioning

confidence: 99%

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Karst bauxite formation during Miocene Climatic Optimum (central Dalmatia, Croatia): mineralogical, compositional and geochronological perspectives

Brlek

Gaynor

Mongelli

et al. 2021

Int J Earth Sci (Geol Rundsch)

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The Miocene Climatic Optimum (MCO) represents a global warm period (approximately 17-14.7 Ma) interrupting a longterm period of Cenozoic cooling. To elucidate if bauxitization took place in southeastern European mid-latitude areas during the MCO, we studied a section of undated massive karst bauxite (Crveni Klanac, CK) in central Dalmatia, Croatia, hosted in Upper Cretaceous limestones and overlain by Miocene Sinj Basin lacustrine deposits. Integrated mineralogical, morphological and geochemical analyses indicate the predominant mineral phases of the homogenous bauxite matrix are authigenic, subhedral to euhedral kaolinite and gibbsite. The in-situ mineralization was a consequence of pedogenic processes, indicating the CK bauxites formed autochthonously. In situ U-Pb zircon ages of the lower, middle and upper parts of the CK bauxite are very similar, dominated by Miocene and Oligocene ages, indicating that they all share similar protolith(s). Subsequent high-precision chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) analyses indicate a maximum depositional age (MDA) for the pre-bauxitic material of 16.9576 ± 0.021 Ma (2σ uncertainty, incorporating decay constant uncertainty). This MDA, a maximum age of autochthonous bauxitization, coincides with the onset of the MCO. Based on currently available geochronological constraints, the maximum timeframe for CK bauxitization was less than ~ 700 ka, which matches the records of the MCO in paleo-mid-latitude Europe. The potential imprint of pre-17 Ma bauxitization and contribution of older (i.e., Upper Paleogene) bauxite deposits resedimented to the CK profile, as well as degree of potential parautochthonous origin of the CK bauxites, is yet to be investigated. More than simply aligning with regional and local reconstructions of continental climatic conditions during the onset and the early stages of the MCO, the high degree of autochthony of the CK bauxites provide a precise climatic constraint. For in-situ bauxitization to occur in the southeastern parts of mid-latitude continental Europe, paleoclimatic and paleoenvironmental conditions must have had mean annual temperature greater than 17-22 °C and mean annual precipitation of more than 1100-1200 mm.

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Section: Formation Of Ck Bauxites: Insights From Mineralogy and Geochemistrymentioning

confidence: 99%

Section: Formation Of Ck Bauxites: Insights From Mineralogy and Geochemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Karst bauxite formation during Miocene Climatic Optimum (central Dalmatia, Croatia): mineralogical, compositional and geochronological perspectives

Brlek

Gaynor

Mongelli

et al. 2021

Int J Earth Sci (Geol Rundsch)

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“…(2008). The growth of the concentric layers that form the cortex of the pisoids and macropisoids also indicates physical and chemical changes in the environmental conditions, giving place to the precipitation of several mineral phases, such as kaolinite and Fe and Ti oxides, and Fe oxyhydroxides, in different quantitates (Yuste et al, 2020).…”

Section: Origin Of the Clay Minerals Pisoids And Carbonates In The Palaeosolsmentioning

confidence: 99%

“…Within the Iberian Plate, a seasonal subtropical climate has been described during the Lower Cretaceous in the Iberian Range (NE Spain) (Bauluz et al, 2014;Buscalioni & Fregenal-Martínez, 2010). This climate is evidenced by the presence of kaolinite-rich clays, bauxites, and lateritic clays in several areas of the Iberian Plate (Bauluz et al, 2014;Combes, 1990;Laita et al, 2020;Molina & Salas, 1993;Yuste et al, 2015Yuste et al, , 2017Yuste et al, , 2020. By contrast, also pointed out a change from warm/humid to cold/ dry conditions in Barremian continental successions from the NW Maestrazgo Basin (SE Iberian Range), which are age-equivalent with some of the palaeosols levels studied in this work.…”

Section: Introductionmentioning

confidence: 99%

Weathering events recorded in uppermost Hauterivian–lower Barremian clay-dominated continental successions from the NW Iberian Range: climatic vs. tectonic controls

et al. 2021

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The facies and clay mineral study of clay/marl-rich levels from the Torrelapaja Formation (latest Hauterivian–early Barremian, NW Iberian Range, NE Spain) allowed to establish the palaeoclimatic and palaeoenvironmental conditions under they were generated. The muddy levels and pisoids contained therein of two logs were sampled and studied by X-ray diffraction and optical and electron microscopy. A similar mineralogical upwards trend is recorded in both logs, with a decrease in calcite coupled with an increase in quartz and orthoclase content and constant proportions in goethite, hematite, diaspore, anatase, rutile, ilmenite, and clay mineral content. The lower muddy levels have higher kaolinite content than the upper levels, where illitic phases are the dominant clay minerals. Smectite and intergrowths of illitic phases and kaolinite are also detected upwards. The kaolinite and smectite textures indicate an authigenic origin, whereas the illitic phases are former phases acting as a substrate for kaolinite crystallization. Pisoids mineralogy and texture show an in-situ origin, but some are fractured, indicating reworking processes. The mineral association found in the muddy levels is characteristic of oxisols formed under warm and humid conditions. The upward decrease in kaolinite content is coeval with an increase in the illitic phases and quartz content, related to siliciclastic input, but is also coeval with the presence of authigenic smectite. This indicates a decrease in chemical weathering, not fully registered due to the siliciclastic contribution, which was possibly associated with a change to colder, drier conditions during the latest Hauterivian–early Barremian in the studied area.

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Preface to the Special Issue in memory of Emilio Galán

Carretero

Villar

Ferrell

et al. 2021

Applied Clay Science

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Palaeoweathering events recorded on siliciclastic continental deposits (Albian, Lower Cretaceous) in NE Spain

Cited by 8 publications

References 38 publications

Karst bauxite formation during Miocene Climatic Optimum (central Dalmatia, Croatia): mineralogical, compositional and geochronological perspectives

Karst bauxite formation during Miocene Climatic Optimum (central Dalmatia, Croatia): mineralogical, compositional and geochronological perspectives

Weathering events recorded in uppermost Hauterivian–lower Barremian clay-dominated continental successions from the NW Iberian Range: climatic vs. tectonic controls

Preface to the Special Issue in memory of Emilio Galán

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