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Petrography
About: Petrography is a research topic. Over the lifetime, 7449 publications have been published within this topic receiving 102018 citations.
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TL;DR: Li et al. as mentioned in this paper used a suite of petrographic and geochemical techniques including thin section and X-Ray Diffraction analysis, scanning electron microscopy, MAPS mineralogy, Cathodeluminescence, electron probe microanalysis and fluid inclusion analysis on a set of selected tight sandstone samples.
77 citations
TL;DR: The filling history of the Nispero deeply buried Lower Cretaceous carbonate reservoir (below 4000m) from the south part of Gulf of Mexico was studied using a combination of data from petrography, stable isotopes and fluid inclusions and compared with a one-dimensional burial model to derive timing as discussed by the authors.
77 citations
TL;DR: In the Ndias Massif (western Senegal), a detailed study of ferricrete profiles developed on kaolinic sandstones showed that these ferricretes (iron crusts) are composed of a succession of different horizons or layers, the arrangement of which is both chronologic and genetic as mentioned in this paper.
77 citations
TL;DR: In this article, the authors provided petrologic data for the pre-Cenozoic tectonic evolution of the South China Sea and further supported the idea that a Middle Jurassic to mid-Cretaceous subduction zone existed across the temporary Taiwan, Palawan to Southern Vietnam, which was associated with westward to northestward convergence of the Pacific Plate during Late Mesozoic.
77 citations
TL;DR: The Deccan province of India has been studied extensively in the literature as discussed by the authors, with the focus on the Upper Deccans. But the results of these studies are limited.
Abstract: The islands of Bombay, Salsette, and Trombay expose basalts and associated rocks belonging to the Upper Deccan group, probably of Tertiary age. The basalts dip 10°–20°W. throughout the area. Interbedded with the basalts are sediments mainly of tuffaceous origin and in part deposited in fresh water, and relatively small extrusives and intrusives of highly mafic rocks (monchiquite, ankaramite, oceanite) and of felsic rocks (rhyodacites, rhyolites). Previous work in the area is summarized.
Petrographic descriptions of the prevailing rock types and nine new chemical analyses are given. Sixty-four analyses of Deccan rocks taken from the literature are reviewed. Averages are calculated for the Deccan basalts and for the Upper and Lower Deccan groups. The analyses are plotted on four types of chemical diagrams. Like many basaltic rock suites, the Deccan province shows an initial stage of iron enrichment, followed by dominant alkali enrichment. The average Deccan basalt has somewhat more FeO and less Al2O3 and MgO than most tholeiitic basalts.
The absence or scarcity of pigeonite in Deccan basalts is attributed to the chemical characteristics of the magma and rapid cooling with incomplete crystallization of the basalts. The felsic rocks are believed to represent differentiates of the basaltic magma, produced by crystal fractionation and diffusion of volatiles. Magmatic differentiation was directed initially toward a rhyodacitic residuum and only in the final stages toward rhyolitic melts with more K2O than Na2O.
77 citations