Re-evaluation of the Use of Undulatory Extinction and Polycrystallinity in Detrital Quartz for Provenance Interpretation

Basu, Abhijit; Young, S. W.; Suttner, Lee J.; James, W. C.; Mack, Greg H.

doi:10.1306/212f6e6f-2b24-11d7-8648000102c1865d

Cited by 93 publications

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“…Table 1 shows the petrographic classes and the main petrographic indices and parameters considered in this study. Point-count results are summarized in (2003), which is based on the quartz categories defined by Basu et al (1975) (QmrQmoQp) ( Table 4). These diagrams describe the main composition of sands and the textural types of some species as the quartz types (Qnu, Qu, Qp 2-3 , Qp >3 ) defined by Basu et al (1975) and modified by Tortosa et al (1991) for the Spanish Central System.…”

Section: Methodsmentioning

confidence: 99%

“…5d; Basu et al, 1975; shows faint variations that could reflect discrete differences in source area composition. T1 appears separated from the other two units due to its greater polycrystalline quartz (Qp) contents, while T2 and T3 differ in that non-undulatory quartz (Qmr) grains predominate over undulatory quartz (Qmo) grains in T3.…”

Section: Grain Types Non Carbonate Extrabasinal Grains (Nce)mentioning

confidence: 99%

“…6; Basu et al, 1975;Tortosa et al, 1991), samples of the Somosaguas sediments are plotted in the plutonic-metamorphic high grade provenance field. Samples of T2 and T3 sediments show a tendency to move away from the Qp 2-3 apex and the T3 data tend to approach the Qnu vertex.…”

Section: Grain Types Non Carbonate Extrabasinal Grains (Nce)mentioning

confidence: 99%

“…These indices indicate the maturity of a deposit (Qp + Qm/ F + R; Qp/ F + R), the presence of Fig. 6.-Point-count data derived from a medium-grained quartz population plotted on the diamond-shaped provenance-discrimination diagrams of: A) Basu et al (1975); B) Tortosa et al (1991); Qnu = non-undulatory monocrystalline quartz; Qu = undulatory monocrystalline quartz; Qp 2-3 = polycrystalline quartz with 2-3 crystals; Qp >3 = polycrystalline quartz with more than 3 crystals. eas in the Central System, our results are consistent with areas defined as mixtures of granites (about 60%) and gneisses (about 40 %), though with some influence of medium-low grade metamorphic materials as indicated by the labile rock fragments observed (Table 2).…”

Section: Petrographic Parametersmentioning

confidence: 99%

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Composition of clastic sediments in the Somosaguas area (middle Miocene, Madrid Basin): insights into provenance and palaeoclimate

Fesharaki

Mocoroa

Martínez

2015

Journal of Iberian Geology

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The western area of the Cenozoic Madrid Basin has not been adequately studied. This, combined with the high homogeneity of detrital facies makes the stratigraphic correlation with other areas of the basin rather difficult. Consequently, only a detailed characterization of different study zones can allow subsequent correlation over this area. Over the last years there have been discovered several vertebrate fossil sites in this area that allow the dating of the sediments which host the fossil remains and provide data about palaeoclimatic trends. In this paper we present the results of the light minerals petrographic analysis carried out in one of these sites (Somosaguas paleontological site). Previous palaeontological and isotopic studies in this site indicate a climate event of cooling and rising aridity that has been described globally for the period after the Miocene Climatic Optimum. The petrographic data and indices presented here corroborate this trend towards a more arid climate through the Somosaguas sedimentary succession. Besides we study the grades of alteration of plagioclase grains as a proxy in the evaluation of palaeoclimatic variations. The increase towards the top of the succession of less altered plagioclase grains suggests a decrease in precipitations and thus more aridity. Part of the quartz and K-feldspar grains display several features like embayments and alterations pointing to palaeosoils formation and reworking processes. These characteristics and other observations suggest several sedimentary pulses in a geotectonic setting of "basement uplift" and a mixed lithological provenance for the Somosaguas deposits (granites, gneisses and minor quantities of low-grade metamorphic rocks).Keywords: middle Aragonian, Miocene Climatic Optimum, aridity, palaeosol, plagioclase alteration, sand Resumen La zona occidental de la cuenca de Madrid no ha sido adecuadamente estudiada. Esto, combinado con la alta homogeneidad de facies detríticas dificulta la correlación estratigráfica con otras áreas de la cuenca. En consecuencia, sólo una caracterización detallada de diferentes zonas de estudio puede permitir posteriores trabajos de correlación regional. En los últimos años se han descubierto varios yacimientos de fósiles de vertebrados en esta área que permiten la datación de los sedimentos que albergan estos restos y proporcionan datos paleoclimáti-cos. En este trabajo se presentan los resultados de los análisis composicionales de minerales ligeros realizados en uno de estos yacimientos (yacimiento paleontológico de Somosaguas). Estudios paleontológicos e isotópicos previos en este yacimiento registran un evento climá-tico de enfriamiento y aumento de la aridez que se ha descrito a nivel mundial para el período posterior al Óptimo Climático del Mioceno. Los datos e índices petrográficos presentados en este trabajo corroboran la tendencia hacia un clima más árido a lo largo de la sucesión sedimentaria de Somosaguas. Además, se estudian los grados de alteración de los granos de plagioclasa como prox...

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Section: Methodsmentioning

confidence: 99%

Section: Grain Types Non Carbonate Extrabasinal Grains (Nce)mentioning

confidence: 99%

Section: Grain Types Non Carbonate Extrabasinal Grains (Nce)mentioning

confidence: 99%

Section: Petrographic Parametersmentioning

confidence: 99%

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Composition of clastic sediments in the Somosaguas area (middle Miocene, Madrid Basin): insights into provenance and palaeoclimate

Fesharaki

Mocoroa

Martínez

2015

Journal of Iberian Geology

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“…Plotting the modal data on the Tortosa et al (1991) and Basu et al (1975) (Nesbitt and Young, 1982) and ICV (Cox et al, 1995) values of the studied sandstones from Nayband Formation, central Iran.…”

Section: Modal Analysismentioning

confidence: 99%

Sandstone petrography and geochemistry of the Nayband Formation (Upper Triassic, Central Iran): Implications for sediment provenance and tectonic setting

Etesampour

Mahboubi

Moussavi‐Harami

et al. 2019

Austrian Journal of Earth Sciences

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The Upper Triassic (Norian–Rhaetian) Nayband Formation is situated at the southwestern margin of Central East Iranian Microcontinent and records Eo-Cimmerian events. The formation is composed of mixed carbonate-siliciclastic deposits. This study presents information on the tectonic reconstruction and palaeoclimate of the southwestern margin of Central East Iranian Microcontinent during the Late Triassic. Petrography and modal analyses of sandstones show a variety of quartz-rich petrofacies including subarkose, lithic arkose, sublitharenite, feldspathic litharenite and litharenite. The combined modal analysis and geochemical results of major and trace elements of the sandstone samples represents mixed sedimentary, intermediate, felsic igneous rocks and moderate- to high-grade metamorphic provenance areas. The major elements and modal analyses of the Nayband Formation sandstone samples suggest an active continental margin tec-tonic settings. The palaeoclimatic conditions were sub-humid to humid with relatively low to moderate weathering in the source area which is in agreement with the palaeogeography and palaeotectonic history of southwestern margin of Central East Iranian Microcontinent during the Late Triassic.

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Hinterland environments of the Late Jurassic northern Weald Basin, England

Barshep

Worden

2023

Geological Journal

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Reconstructing provenance in sandstones can be challenging, especially when the hinterland palaeogeology is unknown due to burial, diagenesis or weathering of the original outcrops. As sedimentary processes alter the distribution of minerals in the depositional environment, the use of multiple provenance methods reduces uncertainties, because, together, they can account for depositionally‐controlled textural and mineralogical re‐distribution in a basin. Here, we have applied petrography, X‐ray fluorescence geochemistry and sedimentology to understand the provenance of shallow marine Corallian sandstones with the aim of deducing the palaeogeology, palaeoenvironment and sediment distribution within the northern parts of the Upper Jurassic Weald Basin, onshore UK. The Corallian sandstones had a mixed mafic‐felsic (intermediate), metasedimentary recycled orogen source. The hinterland experienced significant physical and chemical weathering under humid conditions. Corallian sandstones were relatively more chemically mature up‐dip and more texturally mature down‐dip. Chemically unstable grains and heavy minerals were relatively concentrated down‐dip. Heterogeneous, sedimentologically‐controlled mineral distribution patterns highlight potential errors which may be made in deriving source‐area maturity. This study is significant as it illustrates the combined roles of provenance and deposition in controlling primary mineral distribution that then influenced the style of burial diagenesis. The work presented here emphasizes the importance of a multi‐proxy approach to improve provenance analysis.

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Re-evaluation of the Use of Undulatory Extinction and Polycrystallinity in Detrital Quartz for Provenance Interpretation

Cited by 93 publications

References 0 publications

Composition of clastic sediments in the Somosaguas area (middle Miocene, Madrid Basin): insights into provenance and palaeoclimate

Composition of clastic sediments in the Somosaguas area (middle Miocene, Madrid Basin): insights into provenance and palaeoclimate

Sandstone petrography and geochemistry of the Nayband Formation (Upper Triassic, Central Iran): Implications for sediment provenance and tectonic setting

Hinterland environments of the Late Jurassic northern Weald Basin, England

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