Palygorskite and Sepiolite Deposits in Continental Environments. Description, Genetic Patterns and Sedimentary Settings

Galán, E.; Pozo, Manuel

doi:10.1016/b978-0-444-53607-5.00006-2

Cited by 78 publications

(78 citation statements)

References 59 publications

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“…Variation in "crystallinity" (actually order/disorder) is a common feature in sepiolite samples of many deposits world-wide (Galán and Pozo, 2011). These variations can be studied through a detailed examination of the X-ray diffraction profiles.…”

Section: Resultsmentioning

confidence: 99%

Microwave assisted acid treatment of sepiolite: The role of composition and “crystallinity”

Franco

Pozo

Cecilia

et al. 2014

Applied Clay Science

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Section: Resultsmentioning

confidence: 99%

Microwave assisted acid treatment of sepiolite: The role of composition and “crystallinity”

Franco

Pozo

Cecilia

et al. 2014

Applied Clay Science

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“…These conditions controlled the strongly evaporated percolating groundwater during or following calcite precipitation in a vadose zone (Suárez et al, 1994;Sánchez and Galán, 1995; La (Taylor and McLennan, 1985) and (b) chondrite- (Boynton, 1984) normalised spider diagrams of the calcrete, palaeosol, pyroclast, and ignimbrite. Verrecchia and Le Coustumer, 1996;Colson et al, 1998;Galán and Pozo, 2011;Yalçın and Bozkaya, 2011). The palaeosol samples are characterised by high Al 2 O 3 , Fe 2 O 3 , and SiO 2 , all related to the presence of feldspar and smectite in the samples (Gürel and Kadir, 2006).…”

Section: Discussionmentioning

confidence: 99%

Geology, mineralogy, geochemistry, and depositional environment of a Late Miocene/Pliocene fluviolacustrine succession, Cappadocian Volcanic Province, central Anatolia, Turkey

Göz¹,

Kadır²,

Gürel³

et al. 2014

Turkish J Earth Sci

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has been provided concerning the local palaeoclimates, and the effects of the Messinian Salinity Crisis on terrestrial areas surrounding the Mediterranean Sea are currently a matter of discussion. Therefore, the goals of this paper are to describe the mineralogy, geochemistry, and depositional environment of the Late Miocene/Pliocene fluviolacustrine deposits and associated palaeosols and calcretes within the CVP and to interpret the palaeoenvironmental and palaeoclimatic evolution data.

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“…5,11). This is of special importance for protoliths from evaporitic successions, which may have important contributions of Mg-carbonates (e.g., Galán and Pozo 2011;Jones and Conko 2011) but also excludes the formation of whiteschists in presence of a metasomatic CO 2 -rich fluid phase.…”

Section: Discussionmentioning

confidence: 99%

Protoliths and phase petrology of whiteschists

Franz

Romer

Capitani

2013

Contrib Mineral Petrol

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Whiteschists appear in numerous high-and ultrahigh-pressure rock suites and are characterized by the mineral assemblage kyanite ? talc (?-quartz or coesite). We demonstrate that whiteschist mineral assemblages are well stable up to pressures of more than 4 GPa but may already form at pressures of 0.5 GPa. The formation of whiteschists largely depends on the composition of the protolith, which requires elevated contents of Al and Mg as well as low Fe, Ca, and Na contents, as otherwise chloritoid, amphibole, feldspar, or omphacite are formed instead of kyanite or talc. Furthermore, the stability field of the whiteschist mineral assemblage strongly depends on XCO 2 and fO 2 : already at low values of XCO 2 , CO 2 binds Mg to carbonates strongly reducing the whiteschist stability field, whereas high fO 2 enlarges the stability field and stabilizes yoderite. Thus, the scarcity of whiteschist is not necessarily due to unusual P-T conditions, but to the restricted range of suitable protolith compositions and the spatial distribution of these protoliths: (1) continental sedimentary rocks and (2) hydrothermally and metasomatically altered felsic to mafic rocks. The continental sedimentary rocks that may produce whiteschist mineral assemblages typically have been deposited under arid climatic conditions in closed evaporitic basins and may be restricted to relatively low latitudes. These rocks often contain large amounts of the clay minerals palygorskite and sepiolite. Marine sediments generally do not yield whiteschist mineral assemblages as marine shales commonly have too high iron contents. Sabkha deposits may have too high CO 2 contents. Protoliths of appropriate geochemical composition occur in and on continental crust. Therefore, whiteschist assemblages typically are only found in settings of continental collision or where continental fragments were involved in subduction. Our calculations demonstrate that whiteschists can form by closed-system metamorphism, which implies that the chemical and isotopic composition of these rocks provide constraints on the development of the protoliths.

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Palygorskite and Sepiolite Deposits in Continental Environments. Description, Genetic Patterns and Sedimentary Settings

Cited by 78 publications

References 59 publications

Microwave assisted acid treatment of sepiolite: The role of composition and “crystallinity”

Microwave assisted acid treatment of sepiolite: The role of composition and “crystallinity”

Geology, mineralogy, geochemistry, and depositional environment of a Late Miocene/Pliocene fluviolacustrine succession, Cappadocian Volcanic Province, central Anatolia, Turkey

Protoliths and phase petrology of whiteschists

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