Geochemistry of Permo-Triassic mudstone of the Satpura Gondwana basin, central India: Clues for provenance

Provenance and depositional setting of Lower Silurian siliciclastic rocks on Hainan Island, South China: Implications for a passive margin environment of South China in Gondwana

“…Consequently, the chemical and isotopic components of sedimentary rocks can be used to distinguish the sedimentary environment and tectonic setting, even the tectonic evolution of the source area and the formation of the early earth's crust (e.g., McLennan et al, 1995;Ghosh and Sarkar, 2010;Diskin et al, 2011;Tao et al, 2014;Wang and Zhou, 2014).…”

“…Several trace element ratios (e.g., Th/Sc, Th/Co, La/Sc, Cr/Th, La/Th) have been used to determine the provenance of clastic-sedimentary rocks (Taylor and McLennan, 1985;McLennan and Taylor, 1991). Th/Sc and La/Sc ratios of sediments derived from felsic igneous rocks are higher than those derived from mafic ones (Ghosh and Sarkar, 2010). The ratios of Cr/Th and Th/Co in mafic rocks are also distinct from those in felsic rocks.…”

Geochemistry of Fluvial Sediments from Geregu, Southwest Nigeria

“…In a previous study, it has been suggested that sediments have ultramafic igneous rock source when the Cr and Ni contents are >150 ppm and >100 ppm, respectively [46]. Elevated contents of Cr and Ni in sediments have also been used to infer an ultramafic source composition by previous workers [11,28,47,48,49]. According to Armstrong-Altrin et al [28], the increase in Cr and Ni contents from Playa-Azul to Teculutla to Nautla sands, which corresponds to an increasing order in the Cr/ Ni ratios, represents a more mafic source rock composition for the Nautla sand as compared with the other sands on the western Gulf of Mexico beach.…”

Implication of the chemical index of alteration as a paleoclimatic perturbation indicator: an example from the lower Neoproterozoic strata of Aksu, Xinjiang, NW China

“…The major and trace element composition of clastic sedimentary rocks are useful in crustal evolution studies and provide constraints on physical and chemical weathering, as well as sedimentary environment (Nesbitt, 1979;Nesbitt andYoung, 1982, 1984;Taylor and Mclennan, 1985;McLennan and Taylor, 1991;McLennan, 1993;Young and Nesbitt, 1999;Lee, 2002;Young, 2002a;Young et al, 2004;Ghosh and Sarkar, 2010). The bulk chemical changes of major elements that occur during weathering are used to quantify the weathering history of sedimentary rocks to understand past climatic conditions.…”

“…The chemical index of alteration (CIA) values of sediments could reflect the intensity of chemical weathering and associated climate conditions. Generally, low CIA values indicate a cold-arid climatic condition with nearly absence of chemical alteration (Nesbitt et al, 1980;Nesbitt andYoung, 1982, 1984;McLennan et al, 1993;Young, 1999;Ghosh and Sarkar, 2010;Bahlburg and Dobrzinski, 2011;Huang et al, 2014). However, the geochemical research for the Neoproterozoic diamictite, including pre-glacial, post-glacial, and interglacial rocks at other areas are scant and necessary to understand the Neoproterozoic paleoclimatic perturbations in the Aksu region.…”