Effect of Permo-Carboniferous Climate on Illite-Smectite, Haushi Group, Sultanate of Oman

Hartmann, Bernhard H.; Juhasz-Bodnar, Katalin; Ramseyer, Karl; Matter, Albert

doi:10.1346/ccmn.1999.0470203

Cited by 11 publications

(6 citation statements)

References 51 publications

(45 reference statements)

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“…Weathering in cold areas is quite unique from other climates and commonly results in the formation of interstratified clays [47]. As in the deposits of the Talchir Formation, a significant amount of mixed layer illite/smectite and smectite has been reported by others [48,49] to be present in glaciogene sediments. The percentage of illite in the I/S clays is significantly different between the Talchir and Barakar Formations.…”

Section: Climate Change As Inferred From the Clay Mineralmentioning

confidence: 99%

Clay Mineral and Geochemical Proxies for Intense Climate Change in the Permian Gondwana Rock Record from Eastern India

Ghosh

Mukhopadhyay

Chakraborty³

2019

Research

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The clay mineral assemblages and geochemical compositions of the Permian Talchir and Barakar mudstones of the Raniganj basin, India, have been used to interpret terrestrial paleoclimate. The Talchir Formation presents unequivocal evidences of the Permian global glacial climate, and the overlying Barakar Formation with braided fluvial deposits immediately follows the glacial amelioration stage to a humid warm climate. Sediments unaffected by burial diagenesis and originated from a similar source under contrasting climates are ideal for developing proxies for substantial climate shift. Illite (28.4-63.8%), illite/smectite (0-58.6%, 40-80% illite), chlorite (0-53.9%), and chlorite/smectite (5.6-29.8%) constitute the clay mineral assemblage in the Talchir Formation whereas illite (5.3-78.2%), illite/smectite (trace-34.1%, mostly 60-90% illite), and kaolinite (36.1-86.8%) dominate the clay mineral assemblage in the Barakar Formation. The Talchir mudrocks are enriched in mobile elements and depleted in alumina w.r.t. PAAS, have relatively higher K2O/Al2O3 ratios (~0.3), high ICV (1.12-1.28), and lower CIA values (52.6-65.1) compared to those of the younger Barakar mudstones. The Barakar mudstones are depleted in mobile elements w.r.t. PAAS, have relatively low ICV (0.33-0.62) and K2O/Al2O3 values (0.11-0.16), and higher CIA values (72.9-88.2). Textural, mineralogical immaturity, and rock fragments of different components of the basement seen in the Talchir sandstones show these sediments being a first-cycle sedimentary deposit. The distinctive clay mineral assemblage and major oxide composition of the Talchir mudrocks attest to a unique low intensity chemical weathering in cold arid climate. Significant presence of kaolinite as well as distinctive geochemical characters of the Barakar mudrocks marks a shift in the paleoclimate from cold arid to humid. This climatic shift is further supported by the proportion and composition of illite/smectite across the formations. The relative proportion of chlorite and kaolinite and composition of illite/smectite therefore closely corroborate the significant climate shift, and such proxies, therefore, are useful indicators of climate extremes in the geological record.

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Section: Climate Change As Inferred From the Clay Mineralmentioning

confidence: 99%

Clay Mineral and Geochemical Proxies for Intense Climate Change in the Permian Gondwana Rock Record from Eastern India

Ghosh

Mukhopadhyay

Chakraborty³

2019

Research

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“…The DOI given, which may be used for citation purposes, though which will not be active until the version of record is published, is DOI: 10.1346/CCMN.2016.064026 progressive ice-sheet withdrawal coeval to sediment accumulation at the ice-margin caused a 506 northwards shift of the depositional environment. Accordingly, the remaining ice-marginal sediments 507 were exposed to the restrained influx of fresh water, in the form of meltwater, as the ice-sheet retreated 508 giving rise to a reduced elemental leaching and mineral transformations (Hartmann et al, 1999). This 509 contribution thus confirms that the marine depositional environment was absent during the glacial 510 episode in the Southern North Sea (de Gans, 2007).…”

Section: And 477mentioning

confidence: 88%

Illite-Smectite-Rich Clay Parageneses from Quaternary Tunnel Valley Sediments of the Dutch Southern North Sea — Mineral Origin and Paleoenvironment Implications

Šegvić

Benvenuti

Moscariello

2016

Clays and clay miner.

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12The Pleistocene sediment infill of elongated glacial incisions of the Southern North Sea (SNS) 13 often is referred to as tunnel valleys (TV). Its depositional environment is not yet fully understood and 14 present study addresses this challenge from a perspective of clay mineral transformation (illite to I-S) 15reported from the largest Elsterian TV of SNS. Material acquired from the K14-12 borehole in the 16 Dutch offshore was analyzed by X-ray diffraction, electron microscopy, electron microprobe analyses, 17and laser particle-size analysis. Illite and illite-smectite appeared as dominant clays along with minor 18 amounts of kaolinite, kaolinite-smectite, and chlorite. Highest amount of I-S is recognized in TV main 19 portion, while in pre-glacial and uppermost deposits I-S is less abundant. The XRD peak fitting and 20 deconvolution suggest I-S consists of several intermediates -ordered (well-crystallized illite + R3 I-S) 21and disordered (R0 I-S + R0 I-SS). Given the average particle sizes (> 2 µm) and Kübler index values 22 (0.415-0.341°Δ2θ), illite as well as chlorite and kaolinite were interpreted as detrital. On the basis of I-23 S distinctive distribution, grain sizes, and compositional variations its formation by way of early 24 diagenetic in-situ smectitization of illite under a cold climate is proposed. The process operated via a 25 series of mixed-layer intermediates derived from an illite component being progressively converted to 26 low-charged smectite. The reaction is marked by a significant net loss of K and Al with replacement 27 by Si in a tetrahedral coordination. Layer charge imbalance is accommodated by Fe 3+ and Mg entering 28 an octahedral layer, whereas Ca partly fills the interlayer sites. Smectitization rates were controlled by 29 illite grain sizes. The results of this study strongly support the existence of an ice-marginal fresh water 30 depositional environment at the glacial maximum in SNS in which early diagenesis at low 31 temperatures resulted in incomplete illite conversion into smectite. 32This is a 'pre-publication' version of an accepted article for Clays and Clay Minerals. This version may be subject to change during the production process.The DOI given, which may be used for citation purposes, though which will not be active until the version of record is published, is

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“…According to [62], the presence of dickite could be confirmed by XRD or infrared studies (not the present case), while its formation could be estimated for about 120 • C. The transformation of smectite to illite resulted in the illite/smectite mixed-layered minerals of about 80-90% illite. According to [63] a drastic increase of illite percentage in illite/smectite was observed at~60-80 • C. The high illite content up to 90% in the mixed-layered illite/smectite mineral points to a temperature of~160 • C, which influenced the rocks under discussion [64]. The fibrous illite is interpreted to be the authigenic mineral, which, in the diagenetic history, crystallizes the last.…”

Section: Cementationmentioning

confidence: 99%

Formation of Diagenetic Minerals in the Carboniferous Rock Complex from the Fore-Sudetic Monocline (SW Poland): Fluid Inclusion, Isotopic and Raman Constraints

et al. 2021

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The paper presents the latest state of knowledge on clastic sedimentary rocks from the Carboniferous complex in the SW part of the Polish Lowlands, studied to help determine their potential prospectivity for the occurrence of oil and/or gas deposits. Rocks were analyzed with respect to the petrographic-mineralogical characteristics of the Carboniferous deposits, their diagenesis, determinations of pressure-temperature conditions of mineral formation and the hydrocarbon occurrence. Analyses were carried out on samples from four selected boreholes in the Fore-Sudetic Monocline. After microscopic analysis of rocks and minerals in thin sections, the following techniques were used: luminescence analysis (UV, blue light), microthermometric analysis of fluid inclusions in double-sided polished wafers, XRD analyses, stable isotopic analyses (carbon, oxygen) on calcite and dolomite-ankerite and Raman spectra of fluid inclusions. Orthochemical components, such as carbonates and authigenic quartz, that form cements or fill the veins cutting the sample material have been studied. Fluid inclusion data in quartz and carbonates result in homogenization temperatures of 74–233 °C. The Raman analysis gives temperature estimations for the organic matter of about 164 °C and 197 °C, depending on the borehole, which points to a low coalification degree. The post-sedimentary processes of compaction, cementation and diagenetic dissolution under eo- and meso-diagenetic conditions to temperatures of over 160 °C influenced the present character of the deposits. P-T conditions of brines and methane trapping have been estimated to be ~850–920 bars and 185–210 °C (vein calcite) and ~1140 bars and 220 °C (Fe-dolomite/ankerite). However, locally, temperatures might have been higher (>200 °C), which may be a symptom of local regional metamorphism of a very low degree.

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Effect of Permo-Carboniferous Climate on Illite-Smectite, Haushi Group, Sultanate of Oman

Cited by 11 publications

References 51 publications

Clay Mineral and Geochemical Proxies for Intense Climate Change in the Permian Gondwana Rock Record from Eastern India

Clay Mineral and Geochemical Proxies for Intense Climate Change in the Permian Gondwana Rock Record from Eastern India

Illite-Smectite-Rich Clay Parageneses from Quaternary Tunnel Valley Sediments of the Dutch Southern North Sea — Mineral Origin and Paleoenvironment Implications

Formation of Diagenetic Minerals in the Carboniferous Rock Complex from the Fore-Sudetic Monocline (SW Poland): Fluid Inclusion, Isotopic and Raman Constraints

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