Three study cases of growth morphology in minerals: Halite, calcite and gypsum

Aquilano, Dino; Otálora, Fermı́n; Pastero, Linda; García‐Ruiz, Juan Manuel

doi:10.1016/j.pcrysgrow.2016.04.012

Cited by 102 publications

(56 citation statements)

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“…Laboratory experiments documented that gypsum morphologies are influenced by factors such as the degree of evaporation, the presence or absence of other evaporite minerals, the brine temperature, the amount of organic matter and seawater pH (e.g. Cody & Cody, ; Aquilano et al ., ). Cody & Cody () for example, argued that the presence of significant amounts of organic matter may lead to rosette‐shaped growth forms.…”

Section: Interpretation and Discussionmentioning

confidence: 97%

“…Evaporites are peculiar amongst Earth's sedimentary archives as they represent a rather unique depositional environment. The nucleation of evaporite minerals and their morphologies are directly influenced by environmental parameters such as salinity, temperature and availability of organic matter (Cody & Cody, ; Ortí, ; Aquilano et al ., ; Warren, ). Further, evaporite minerals have the potential to preserve the trace element distribution, fluid inclusion composition and isotope ratios of brines from which they precipitated (Deer et al ., ; Lu et al ., , ; Natalicchio et al ., ; Warren, ) and, therefore, they represent an important archive for palaeoenvironmental reconstructions (Warren, ).…”

Section: Introductionmentioning

confidence: 99%

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A lost Tethyan evaporitic basin: Evidence from a Cretaceous hemipelagic meta‐selenite – red chert association in the Eastern Mediterranean realm

et al. 2019

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Ancient evaporite deposits are geological archives of depositional environments characterized by a long-term negative precipitation balance and bear evidence for global ocean element mass balance calculations. Here, Cretaceous selenite pseudomorphs from western Anatolia ('Rosetta Marble')characterized by their exceptional morphological preservationand their 'marine' geochemical signatures are described and interpreted in a process-oriented context. These rocks recorded Late Cretaceous high-pressure/low-temperature, subductionrelated metamorphism with peak conditions of 1Á0 to 1Á2 GPa and 300 to 400°C. Metre-scale, rock-forming radiating rods, now present as fibrous calcite marble, clearly point to selenitic gypsum as the precursor mineral. Stratigraphic successions are recorded along a reconstructed proximal to distal transect. The cyclical alternation of selenite beds and radiolarian ribbon-bedded cherts in the distal portions are interpreted as a two type of seawater system. During arid intervals, shallow marine brines cascaded downward into basinal settings and induced precipitation. During more humid times, upwelling-induced radiolarian blooms caused the deposition of radiolarite facies. Interestingly, there is no comparable depositional setting known from the Cenozoic world. Meta-selenite geochemical data (d 13 C, d 18 O and 87 Sr/ 86 Sr) plot within the range of reconstructed middle Cretaceous seawater signatures. Possible sources for the 13 C-enriched (mean 2Á2&) values include methanogenesis, gas hydrates and cold seep fluid exhalation. Spatially resolved component-specific analysis of a rock slab displays isotopic variances between meta-selenite crystals (mean d 13 C 2Á2&) and host matrix (mean d 13 C 1Á3&). The Cretaceous evaporite-pseudomorphs of Anatolia represent a basin wide event coeval with the Aptian evaporites of the Proto-Atlantic and the pseudomorphs share many attributes, including lateral distribution of 600 km and stratigraphic thickness of 1Á5 to 2Á0 km, with the evaporites formed during the younger Messinian salinity crisis. The Rosetta Marble of Anatolia may represent the best-preserved selenite pseudomorphs worldwide and have a clear potential to act as a template for the study of meta-selenite in deep time. 2627

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Section: Interpretation and Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A lost Tethyan evaporitic basin: Evidence from a Cretaceous hemipelagic meta‐selenite – red chert association in the Eastern Mediterranean realm

et al. 2019

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“…A formação de halita é relacionada a condições de elevada salinidade e aridez climática, associadas a restrições de circulação de águas (Aquilano et al, 2016), sendo que cubos e formas esqueletais de halita em matriz carbonática podem ser indicativas de ambiente marginal do tipo sabkha (Silva et al, 2000). O quartzo autigênico tem sua formação relacionada ao input fluvial de soluções de intemperismo continental em climas semi-áridos (Flügel, 2010).…”

Section: Associações De Microfáciesunclassified

Caracterização paleoambiental a partir de microfácies carbonáticas da Formação Itaituba (Pensilvaniano Inferior da Bacia do Amazonas), no município de Itaituba (PA)

Neves¹,

Barbosa²

2019

PESQUI GEOCIENC

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Visando a interpretação e a inferência dos paleoambientes de duas sucessões carbonática pertencente à Formação Itaituba (Pensilvaniano da Bacia do Amazonas), que aflora às margens do Rio Tapajós, SW do Estado do Pará, estudos petrográficos voltados à caracterização e identificação de microfáceis sedimentares foram realizados a partir da análise de 50 seções delgadas. A análise petrográfica foi desenvolvida de acordo com a metodologia padrão para estudos desta natureza, envolvendo, essencialmente, a classificação das rochas carbonáticas, a caracterização e a individualização de microfácies. Como resultado destas análises foram identificadas nove microfácies: Mudstone com evaporitos (Me), Wackestone com terrígenos (Wt), Wackestone com quartzo autigênico e fitoclastos (Wqf), Wackestone com braquiópodes e crinóides (Wbc), Packstone com braquiópodes (Pb), Grainstone com braquiópodes (Gb), Grainstone com fusulinídeos (Gf), Grainstone com aglutinantes (Ga) e Boundstone com intraclastos (Bi). Destas microfácies, foram distinguidas quatro microbiofácies, baseadas nos trends e análise dos bioclastos, e cinco associações de grãos não-esqueletais, fundamentadas no significado sedimentológico destes grãos. A partir disto, foram interpretadas cinco associações de microfácies (AMF) representativas de sistemas deposicionais distintos: AMF-01) sabkha, AMF- 02) planície de maré, AMF-03) laguna, AMF-04) canais de maré e AMF-05) barras bioclásticas. Estas associações de microfácies indicam um modelo deposicional de plataforma carbonática em rampa, com o desenvolvimento de um sistema deposicional marinho raso, dominado por sedimentação carbonática, influenciado por maré, sob regime climático dominante de clima semiárido e temperatura da massa d’água variando de temperada a quente.

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“…The BaSO 4 layer on polycrystalline samples resembles the layer formed on the striated gypsum surfaces, which are randomly oriented, analogous to the polycrystalline surfaces. The natural morphology of gypsum (Aquilano et al, 2016) is dominated by the {010} crystal surface (cleavage surfaces), and may exhibit other equilibrium F forms {120}, {011} and {111}, as well as other stepped forms (S forms) {100}, {12 2}, {140}, {180}, along with the kinked {102} form (K form). These overall crystal morphologies come into play during the replacement reaction in the gypsum polycrystalline cubes.…”

Section: Polycrystalline Cubesmentioning

confidence: 99%

Baryte cohesive layers formed on a (010) gypsum surface by a pseudomorphic replacement

Ruiz‐Agudo¹,

Álvarez‐Lloret²,

Lorenzo³

et al. 2019

ejm

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The mineral replacement of gypsum (CaSO 4 Á2H 2 O) by baryte (BaSO 4) is relevant to technological and industrial applications, including its use as a plaster or stone consolidant in cultural heritage conservation. In the present study, we provide experimental evidence suggesting that, during the interaction of gypsum cleavage surfaces with barium-bearing solutions, a pseudomorphic replacement takes place and results in the formation of a crystallographically oriented baryte layer. This mineral replacement process is favoured by the porosity generated, due to the differences in molar volume and solubility between parent and product sulfate phases, allowing the progress of the reaction. The homogeneous micrometre-sized layer of baryte occurs most likely via a fluid-mediated interface-coupled dissolution-precipitation mechanism. A certain degree of crystallographic control on the polycrystalline BaSO 4 product layer by the structure of the parent substrate (gypsum) is confirmed by electron microscopy observations and X-ray diffraction analyses. The structural control exerted by the cleavage gypsum surface on the baryte layer can be defined by the epitactic relationship: Gyp (010) || Bar (010). The formation of baryte increases with reaction time until passivation occurs at the replacement interface, probably due to a decreased porosity and loss of connectivity that thereby prevents further reaction. The investigation of these processes occurring on freshly cleaved single crystals of gypsum were complemented by studying the replacement of polycrystalline gypsum cubes, showing a homogeneous baryte surface layer on the sample. The results of this study thus offer interesting insights into the application of the replacement of gypsum by baryte as a conservation method for gypsum sculptures and plasterwork, increasing their resistance against water and humidity while preserving the surface features of the original mineral substrate.

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Three study cases of growth morphology in minerals: Halite, calcite and gypsum

Cited by 102 publications

References 79 publications

A lost Tethyan evaporitic basin: Evidence from a Cretaceous hemipelagic meta‐selenite – red chert association in the Eastern Mediterranean realm

A lost Tethyan evaporitic basin: Evidence from a Cretaceous hemipelagic meta‐selenite – red chert association in the Eastern Mediterranean realm

Caracterização paleoambiental a partir de microfácies carbonáticas da Formação Itaituba (Pensilvaniano Inferior da Bacia do Amazonas), no município de Itaituba (PA)

Baryte cohesive layers formed on a (010) gypsum surface by a pseudomorphic replacement

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