Petrography and geochemistry of clastic sedimentary rocks as evidences for provenance of the Lower Cambrian Lalun Formation, Posht-e-badam block, Central Iran

Etemad‐Saeed, Najmeh; Hosseini-Barzi, Mahboobeh; Armstrong‐Altrin, John S.

doi:10.1016/j.jafrearsci.2011.06.003

Cited by 115 publications

(48 citation statements)

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“…13,21,22,32 The small chips with natural broken surfaces were selected for FE-SEM analysis by a Tescan MIRA 3 equipped with an energy-dispersive spectrometer (EDS) to observe characteristics of pores and micro-fractures. 3,8,23 The samples are coated with gold to provide a conductive surface. The amplification factor of the equipment is 3.5-100,000 and it could provide images of nano-pores structure with high revolution down to 1 nm, which is employed to identify the shape, type and pore size in TYS samples.…”

Section: Methodsmentioning

confidence: 99%

“…In the process of buries, the strong compaction makes the clay parallel or deformed around the scattered rigid grains. 23,35,40 The compaction of clay mineral reduces plenty of initial pores volumes in shale and decreases the irregular pore surface and heterogeneous pore structure. Therefore, the shale samples with higher clay minerals content have smaller fractal dimensions.…”

Section: Relationships Between Fractal Dimensions and The Mineralogicmentioning

confidence: 99%

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Fractal Characteristics of Pores in Taiyuan Formation Shale From Hedong Coal Field, China

Zeng

Cai

et al. 2018

Fractals

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For the purpose of investigating the fractal characteristics of pores in Taiyuan formation shale, a series of qualitative and quantitative experiments were conducted on 17 shale samples from well HD-1 in Hedong coal field of North China. The results of geochemical experiments show that Corresponding author. This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. 1840006-1Fractals 2018.26. Downloaded from www.worldscientific.com by 13.66.222.141 on 06/06/19. Re-use and distribution is strictly not permitted, except for Open Access articles. K. Li et al.Total organic carbon (TOC) varies from 0.67% to 5.32% and the organic matters are in the high mature or over mature stage. The shale samples consist mainly of clay minerals and quartz with minor pyrite and carbonates. The FE-SEM images indicate that three types of pores, organicrelated pores, inorganic-related pores and micro-fractures related pores, are developed well, and a certain number of intragranular pores are found inside quartz and carbonates formed by acid liquid corrosion. The pore size distributions (PSDs) broadly range from several to hundreds nanometers, but most pores are smaller than 10 nm. As the result of different adsorption features at relative pressure (0-0.5) and (0.5-1) on the N 2 adsorption isotherm, two fractal dimensions D 1 and D 2 were obtained with the Frenkel-Halsey-Hill (FHH) model. D 1 and D 2 vary from 2.4227 to 2.6219 and from 2.6049 to 2.7877, respectively. Both TOC and brittle minerals have positive effect on D 1 and D 2 , whereas clay minerals, have a negative influence on them. The fractal dimensions are also influenced by the pore structure parameters, such as the specific surface area, BJH pore volume, etc. Shale samples with higher D 1 could provide more adsorption sites leading to a greater methane adsorption capacity, whereas shale samples with higher D 2 have little influence on methane adsorption capacity.

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Section: Methodsmentioning

confidence: 99%

Section: Relationships Between Fractal Dimensions and The Mineralogicmentioning

confidence: 99%

Fractal Characteristics of Pores in Taiyuan Formation Shale From Hedong Coal Field, China

Zeng

Cai

et al. 2018

Fractals

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“…The sediment samples have high LREE contents and have flat HREE patterns ( Figure 8). Previous workers have used the REE pattern, coupled with the size of the Eu anomalies, to deduce whether sediments have felsic or mafic igneous rock sources [13,16,26,37,39,50]. Previous workers have documented that mafic rocks are generally characterised by low LREE/HREE ratios and absence or insignificant negative Eu anomalies.…”

Section: Provenancementioning

confidence: 99%

“…studies by various authors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]). Furthermore, some trace elements (e.g.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Fluvial Sediments from Geregu, Southwest Nigeria

Adiotomre

Ejeh

Adaikpoh

2017

Materials and Geoenvironment

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Geochemical analysis of fluvial sediments on the banks of River Ero using inductively coupled plasma mass spectrometry illustrates their maturity, provenance and tectonic setting. The analysed sediment samples show low SiO 2 /Al 2 O 3 ratios of 2.92-2.99 (units FL_A, FL_B and FL_E) and high SiO 2 /Al 2 O 3 ratios of 4. FL_D, FL_F and FL_G). Sediments were geochemically classified as shales (units FL_A, FL_B and FL_E) and greywackes (units FL_C, FL_D, FL_F and FL_G). Ključne besede: rečni sedimenti, Eu anomalija, SW Nigerija, izvor, tektonska uvrstitev

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“…A su vez, las cifras de la relación Eu/Eu*: {Eu/Eu-chondr/[(√Sm/Sm-chondr) x (Gd/Gdchondr)]}, en especial en las fangolitas en las que varían entre 0,51 y 0,78 (Tabla 1, Fig. 10A), son atribuidas a una derivación a partir de rocas félsicas ácidas a intermedias (graníticas hasta granodioríticas) (Cullers y Podkovirov, 2002;Etamad-Saeed et al, 2011;Zhen et al, 2012).…”

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Geoquímica inorgánica como indicador de procedencia y ambiente sedimentario en sucesiones de lutitas negras: los depósitos transgresivos titonianos (Formación Vaca Muerta) de la Cuenca Neuquina, Argentina

Spalletti

Schwarz

Veiga

2014

Andgeo

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Geoquímica inorgánica como indicador de procedencia CONICET-Universidad Nacional de La Plata, calle 1 No. 644, B1900TAC, La Plata, Argentina. spalle@cig.museo.unlp.edu.ar; eschwarz@cig.museo.unlp.edu.ar; veiga@cig.museo.unlp.edu.ar RESUMEN. Se presenta un estudio de geoquímica inorgánica de las sedimentitas formadas durante la transgresión marina del Titoniano temprano en la Cuenca Neuquina. Dichas sedimentitas, que corresponden a los niveles basales de la Formación Vaca Muerta, están altamente enriquecidas en materia orgánica y son consideradas el intervalo con mayor capacidad de generación de petróleo y gas en la cuenca. La sucesión estudiada (<25 m) consiste en rocas de grano fino (pelitas), entre las que se reconocen distintas variedades, desde puramente silicáticas (fangolitas) hasta híbridas silicáticas/carbonáticas (margas). El análisis geoquímico de componentes inorgánicos, realizado sobre 20 muestras procedentes de afloramientos del sector andino de la Cuenca Neuquina, exhibe marcadas diferencias composicionales, que permitieron definir varios tipos litológicos (fangolitas, fangolitas margosas, margas fangolíticas, margas y margas calcáreas). Las fangolitas se caracterizan por más altos contenidos de SiO 2 , Al 2 O 3 , K 2 O, TiO 2 , inmóviles como Th, Lu, Hf, Sc y Zr, y tierras raras (en especial las pesadas). El Sr, por su afinidad con el Ca, aumenta su proporción en las sedimentitas margosas. Las rocas analizadas poseen una composición semejante a la de la corteza continental superior, aunque con contenidos elevados de V y U. Tanto los diagramas empleados para determinar procedencia como el perfil de las tierras raras sugieren que los materiales terrígenos han derivado de rocas ígneas corticales ácidas a intermedias. De esta manera, se definen aportes detríticos desde el arco magmático que flanqueaba a la cuenca por el oeste, así como desde terrenos volcánicos triásicos y jurásicos tempranos ubicados en las regiones del margen pasivo (suroriental) de la cuenca. Tampoco se descarta la contribución desde los depósitos de la subyacente Formación Tordillo, incorporados a los sedimentos de la Formación Vaca Muerta durante el proceso transgresivo. Los altos tenores de Al 2 O 3 , TiO 2 , Th, Zr y la relación Th/U en las fangolitas, y particularmente en los depósitos del sector austral de la cuenca, se consideran claros indicadores del aporte terrígeno. Por su parte, los componentes redox sensitivos (Zn, Co, V, Ni, Ni/Co, U, Mo y la anomalía negativa de Ce), así como el Ca y sus elementos afines (Sr, Ba) muestran contenidos bastante altos en los tipos litológicos híbridos que caracterizan a la región depocentral (norte) del área de estudios. Dichos elementos sugieren que las condiciones anóxicas no solo fueron comunes en la interfase sedimentaria, sino que se incrementaron hacia el interior de la cuenca; a la vez, la productividad carbonática pudo ser mayor o no sufrió importante dilución por aportes terrígenos en esa misma dirección. Este estudio muestra importantes variaciones regionales de la composi...

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Petrography and geochemistry of clastic sedimentary rocks as evidences for provenance of the Lower Cambrian Lalun Formation, Posht-e-badam block, Central Iran

Cited by 115 publications

References 57 publications

Fractal Characteristics of Pores in Taiyuan Formation Shale From Hedong Coal Field, China

Fractal Characteristics of Pores in Taiyuan Formation Shale From Hedong Coal Field, China

Geochemistry of Fluvial Sediments from Geregu, Southwest Nigeria

Geoquímica inorgánica como indicador de procedencia y ambiente sedimentario en sucesiones de lutitas negras: los depósitos transgresivos titonianos (Formación Vaca Muerta) de la Cuenca Neuquina, Argentina

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