Composition of modern stream sand derived from a mixture of sedimentary and metamorphic source rocks (Henares River, Central Spain)

Arribas, José; Critelli, Salvatore; Pera, Emilia Le; Tortosa, A.

doi:10.1016/s0037-0738(00)00026-9

Cited by 64 publications

(41 citation statements)

References 27 publications

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“…5c,d) indicate the preservation of feldspars towards the top of the Somosaguas succession, and a remarkable increase in plagioclase grains towards the T3 unit. Contrary to what we might expect for distal sediments (Breyer and Bart, 1978;Mack, 1978;Cavazza et al, 1993;Ingersoll et al, 1993;Arribas et al, 2000), T2 shows no significant reduction in rock fragments and feldspars relative to the other units. This could reflect the fact that increasing aridity will help preserve a higher percentage of feldspar and rock fragment grains.…”

Section: Provenance and Geotectonic Settingcontrasting

confidence: 78%

“…However, as several authors have suggested (Palomares and Arribas, 1993;Le Pera and Arribas, 2004), the abundance of these grains in the sediments is not directly related to their abundance in the source area. Even when each lithology have a different Sand Generation Index (Palomares and Arribas, 1993;Arribas et al, 2000;, we can define the extent of intervention of each lithology in the final mixture based on other features. For example, a drop is produced in the Lm/Rt index indicating a smaller contribution of low-grade metamorphic rocks towards the top of the sedimentary succession.…”

Section: Provenance and Geotectonic Settingmentioning

confidence: 99%

“…Several studies have addressed the relationship between climate and sandy deposit composition in present-day sediments Basu, 1976;Suttner et al, 1981;Franzinelli and Potter, 1983) which serves as a base for palaeoclimatic interpretations of older sediments. To better understanding the roles of these factors in determining sand composition, actualistic research has addressed fluvial to transitional and marine deposits worldwide (Ingersoll and Suczek, 1979;Le Pera and Critelli, 1997;Le Pera et al, 2001) including river sediments of the Madrid Basin (Arribas et al, 2000;Le Pera and Arribas, 2004). This paper addresses sand petrofacies formed during the Middle Aragonian (14.2Ma) at the Somosaguas palaeontological site (Madrid Basin), the evolution of their source area (Spanish Central System) and the climate that prevailed over the middle Miocene in this area.…”

Section: Introductionmentioning

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: Provenance and Geotectonic Settingcontrasting

confidence: 78%

Section: Provenance and Geotectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

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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“…On the other hand, we have noted a poor representation of Ls grains in the sands (LmLvLs%Ls) compared with source lithology, out lined by a depletion of these grains from source to sand, evaluated on the order of more than half, when compared to the percentages of areal extent in the drainage areas. This is due to the poor capability of sedimentary rocks to generate lithic sand (e.g., Zuffa, 1987;Cavazza et aI., 1993;Arribas et al. 2000) or rapid destruction of sedimentary lithic grains during transport (e.g., Ingersoll et aI., 1993).…”

Section: Province Dmentioning

confidence: 99%

Sand composition in an Iberian passive-margin fluvial course: the Tajo River

Pera

Arribas

2004

Sedimentary Geology

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The Tajo River, the 10th largest river in Europe, drains part of the western passive margin of Europe that includes multiple Province D is quartzofeldspathic (Qm55F39Lt6) with a dominance of phaneritic rock fragments (RssRg33Rm62) and corresponds to the lower reaches of the Tajo River, where siliciclastic deposits of the Neogene Santarem-Lisboa basin are the main sources.Sands plot on provenance-discrimination diagram (QmFLt) within the recycled-orogen field (Tajo River head) and continental block fields (upper, middle and lower course). In addition, we have proven the usefulness of the RsRgRm diagram to discriminate the defined fluvial provinces, originating from heterogeneous parent-rock textures and mineralogy.Climate does not exert any strong influence on the petrogenesis of the Tajo River drainage basin sand, and erosion in the source areas may be described in terms of weathering-limited denudation regime. By contrast, mixing with tributary supplies is the main process that modifies composition in the Tajo River sand. The establishment of fluvial provinces related to the main bedrock structural units reflects the great relevance of tributaries from each province in the generation of the Tajo River sand and the low significance of inherited sandy load from previous provinces. * Corresponding author. Tel.: +39 984 835528; fax: +39 984 835319. E-mail addresses:emilia.lepera@irpi.cnr.it(E.LePera).anibas@geo.ucm.es (l Arribas).The abundance of granitoid rock fragments (RsRgRm%Rg) in fluvial sand of both tributaries and main channel of the Tajo River drainage basin faithfu11y represents the relative abundance of granodiorite+monzogranite bedrock exposure in each subbasin. Metasedimentary and metamorphic bedrock outcrop area is overrepresented by metamorphic rock fragments (RsRgRm%Rm) in both sand from tributaries and from the Tajo main tnmk river. This is manifested by differences of 18 23% between means of metasedimentary outcrop area and the RsRgRm%Rm mean in the sand from Provinces B and C+D, respectively. Sedimentary (mainly carbonate) outcrop area is lUlderrepresented or not represented by sedimentary rock fragments (RsRgRm%Rs) in sand of the Tajo River. This lUlderrepresentation causes a difference between means of sedimentary outcrop area and the RsRgRm%Rs mean of 21%, 17.1% and 10.7% in sands from Province A, B and C+D, respectively. This fact confmns the rapid loss of these grains during transport because of their labile nature.

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“…The chemical and minero-petrographical features of the sandstone and mudrock samples are considered to be dependent on sedimentary processes, including source rocks, weathering, sorting and tectonic setting (e.g., Arribas et al, 2000;Critelli et al, 2003;Perri et al, 2011. By combining the information deduced from the petrography and chemistry it is possible to decipher the sedimentary evolution and geological processes affecting sediments and, thus, the relationships between the source area and the sedimentary basin (e.g., Critelli et al, 1990;Critelli & Le Pera, 1995;Perri, 2014;Perri & Ohta, 2014).…”

Section: Introductionmentioning

confidence: 99%

Compositional signatures of the Cenozoic sedimentary successions of the Malaguide Complex (Betic Cordillera, Spain)

Perri¹,

Critelli²,

Martı́n-Martı́n³

et al. 2016

ROL

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The studied Cenozoic sedimentary successions consist of deposits from continental/shallow-water to deep-marine environments of the Malaguide Complex (Betic Cordillera) outcropping in the Sierra Espuña area (SE Spain). The aim of this study is to characterize the composition, source area(s) provenance and weathering processes of these sedimentary successions from the pre-orogenic (Paleocene-Early Oligocene) to the synorogenic (Late Oligocene-Early Miocene) stage using petrological and geochemical methodologies. The studied sandstones are mainly quartzolithic with abundant metamorphic and sedimentary lithic fragments. In particular, the composition of samples from the pre-orogenic cycle is mainly carbonate with important siliciclastic components that occur within the medium to fine grained arenites. The composition of samples from the syn-orogenic cycle is characterized by a sharp change from carbonate to siliciclastic terms. Thus, the composition of the overall sandstone samples is very heterogeneous and suggests a source area mainly characterized by the Malaguide basement and lower units of the Internal Betic Zone, that partially compose the Mesomediterranean Microplate. The geochemical proxies suggest a provenance mainly from felsic source area with a minor supply from mafic rocks in some samples of the syn-orogenic stage. Furthermore, palaeoweathering indices indicate low to moderate weathering conditions for the sources. The Cenozoic sedimentary successions of the Malaguide Complex played an important role in the geodynamic evolution of the Betic Cordillera that represents the key tectonic element of the western domains of the Mesomediterranean Microplate.

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Composition of modern stream sand derived from a mixture of sedimentary and metamorphic source rocks (Henares River, Central Spain)

Cited by 64 publications

References 27 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

Sand composition in an Iberian passive-margin fluvial course: the Tajo River

Compositional signatures of the Cenozoic sedimentary successions of the Malaguide Complex (Betic Cordillera, Spain)

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