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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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Journal ArticleDOI
TL;DR: The South Mountain batholith as mentioned in this paper is an epizonal complex of granodiorite, adamellite and alaskite which was emplaced after the folding and metamorphic events of the Acadian orogeny.
Abstract: Approximately one-third of western Nova Scotia is underlain by granitic rocks of the South Mountain batholith. The pi u ton is an epizonal complex of granodiorite, adamellite and alaskite which was emplaced after the folding and metamorphic events of the Acadian orogeny. Chemical and petrographic data suggest that the rocks comprise a single comagmatic suite related by the fractional crystallization of biotite and plagioclase. The magma for the batholith may have been produced by partial fusion of the lower crust, or through a hybridization of mantle and crustal melts.

68 citations

Journal ArticleDOI
01 Jun 1988-Geology
TL;DR: Granulite facies lithologies from the Adirondack Mountains of New York contain alteration assemblages composed dominantly of calcite +/- chlorite +/- sericite as discussed by the authors.
Abstract: Granulite facies lithologies from the Adirondack Mountains of New York contain alteration assemblages composed dominantly of calcite +/- chlorite +/- sericite These assemblages document fluid infiltration at middle to upper crustal levels Cathodoluminescence of samples from the Marcy anorthosite massif indicates that the late fluid infiltration is more widespread than initially indicated by transmitted-light petrography alone Samples that appear unaltered in transmitted light show extensive anastomosing veins of calcite (< 005 mm wide) along grain boundaries, in crosscutting fractures, and along mineral cleavages The presence of the retrograde calcite documents paleopermeability in crystalline rocks and is related to the formation of high-density CO/sub 2/-rich fluid inclusions Recognition of this process has important implications for studies of granulite genesis and the geophysical properties of the crust

68 citations

Journal ArticleDOI
TL;DR: In this paper, an integrated study of sandstone framework petrography, heavy mineral analysis and mineral chemistry was adopted to perform provenance analysis of the Tertiary sandstones in the northern Qaidam basin.

68 citations

Journal ArticleDOI
TL;DR: A detailed petrographic account of the basalts and dolerites, gabbros, amphibolites, breccias and serpentinites dredged from Palmer Ridge in the NE Atlantic, accompanied by chemical analyses of rocks and electron probe analyses of minerals are reported.
Abstract: A detailed petrographic account is given of the basalts and dolerites, gabbros, amphibolites, breccias and serpentinites dredged from Palmer Ridge in the NE Atlantic, accompanied by chemical analyses of rocks and electron probe analyses of minerals. Radiometric dates on the rocks are reported. The preliminary conclusions about the geological history and structure of Palmer Ridge have been confirmed and strengthened, and certain petrological problems, in particular the physical conditions under which the amphibolites were metamorphosed, are raised.

67 citations

Journal Article
TL;DR: In this paper, the authors investigated the major, trace, and rare earth element compositions of the Rabanpalli Forrnation of Bhima Basin to understand the provenance.
Abstract: Petrographic, major, trace, and rare earth element compositions of quartz arenites, arkoses, and siltstones of Neoproterozoic Rabanpalli Forrnation of Bhima Basin have been investigated to understand the provenance. The quartz arenites, arkoses, and siltstones have large variations in major element concentrations. For example, quartz arenites and arkoses contain the hlgher Si0 2 (average with one standard deviation being 97±1,73±2,respectively) and lower Al 2 O 3 (0 95±0 4, 9 6±O 9, respectlvely) concentrations than siltstones (SiO 2 =64±4, A1 2 0 3 =14±1), which is mainly due to the presence of quartz and absence of other Al-bearing minerals in relation with rock types. This is also supported by our petrography, since quartz arenites and arkoses contain significant amount of quartz relative to feldspar and lithic fragments. The observed low CIA values and A-CN-K diagram suggest that the sedimentary rocks of Rabanpalli Formation have undergone K-metasomatism. The Co, Ni, Cr, Ba, Zr, Hf, and Th values are higher in siltstones than quartz arenites and arkoses. The EU/EU * , (La/LU) en , La/Sc, Th/Sc, Th/Co, Th/Cr, Cr/Th ratios, and Cr, Ni, V, and Sc values strongly suggest that these sediments were mainly derived from the felsic source rocks. This interpretation is also supported by the Th/Sc versus Sc bivariate and La-Th-Sc triangular plots. The rare earth element (REE) patterns of these rocks also support their derivation from felsic source rocks. Further more, these rocks exhibit higher LREE/HREE ratio (8±4) and a significant negative Eu anomaly (0 77±0 16), which indicate the felsic igneous rocks as a possible source rocks.

67 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023551
20221,098
2021370
2020344
2019310
2018291