Petrology of metamorphic rocks of almandine-amphibolite facies in Saidapuram-Podalakuru area, Nellore district, Andhra Pradesh, India

Babu, V. R. R. M.

doi:10.1007/bf01089046

Cited by 3 publications

(1 citation statement)

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“…According to Pichamuthu (1962Pichamuthu ( , 1967 the Nellore Schist Belt, having a general Dharwarian trend, shows a marked resemblance to the Holenarsipur schist belt of the type area of the Dharwars in Mysore State. And like the latter, the metamorphism of the Nellore Schist Belt corresponds to the almandine amphibolite facies (Pichamuthu, 1962;Babu, 1970). The granites intrusive into the Nellore Schist Belt are of two ages broadly corresponding to the Grey and Pink types present in parts of Mysore and Hyderabad (Fig.…”

Section: Introductionmentioning

confidence: 99%

A bedded deposit of anthophyllite schist in the Precambrian belt of Nellore, South India

Rao

1974

Geol. Mag.

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A pure anthophyllite schist occurs as a bedded deposit conformable with garnet-bearing quartz-muscovite, and quartz-chlorite-biotite schists and diopsidebearing calc-silicate rocks in the north-central part of the Nellore Schist Belt. Field and petrochemical studies show that anthophyllite schist has formed from regional metamorphism of Fe-, Mg-rich aluminous sediments aided by metamorphic differentiation due to local kinematic action under amphibolite facies conditions which is the general grade of metamorphism of the Nellore Schist Belt. A pure anthophyllite schist of sedimentary origin reported here is the first of its kind described from any terrain.

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Section: Introductionmentioning

confidence: 99%

A bedded deposit of anthophyllite schist in the Precambrian belt of Nellore, South India

Rao

1974

Geol. Mag.

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P–T estimates from the Nellore schist belt (India) and evidence for superimposed metamorphic events

Moeen

1998

Geol. J.

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Major-Element Geochemistry and Fe3+/ΣFe of Metabasites

Forshaw,

Dominguez,

Markmann

et al. 2024

Journal of Petrology

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Metabasites (metamorphosed mafic rocks) are crucial for understanding metamorphic and tectonic processes. Their preservation in exhumed orogenic belts from throughout Earth’s history and the diverse mineral assemblages they form under different pressure-temperature conditions make them valuable for studying metamorphic processes. This work compiles a database of 6186 major-element whole-rock analyses of metabasites from different metamorphic facies (low-grade, greenschist, blueschist, amphibolite, granulite, and eclogite). These are used to explore the range and variability in their composition and assess geochemical differences among metamorphic facies. To mitigate the impact of outliers, median values and median absolute deviations (MAD) are used as measures of central tendency and dispersion. Metabasites show decreased volatile content with increasing metamorphic grade and generally consistent major-element contents across facies, with subtle differences interpreted to result from sampling bias. The median worldwide metabasite is as follows (anhydrous, normalised values in wt%, ±MAD): SiO2=51.36±3.40, TiO2=1.33±0.82, Al2O3=15.47±1.97, FeOtotal=11.48±2.50, MnO 0.20±0.06, MgO=6.83±2.25, CaO=9.84±2.34, Na2O=2.82±1.05, K2O=0.50±0.61, and P2O5=0.18±0.16. The median XMg = MgO/(MgO+FeOtotal) is 0.51±0.09. The median Fe3+/ΣFe was measured by titration in 3153 samples and is 0.26±0.12, comparable to values in altered oceanic crust or arc basalts. Future research must carefully examine the distribution of Fe3+ amongst minerals in metabasites, allowing for a better evaluation of the median whole-rock Fe3+/ΣFe and its potential susceptibility to analytical interferences.

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Petrology of metamorphic rocks of almandine-amphibolite facies in Saidapuram-Podalakuru area, Nellore district, Andhra Pradesh, India

Cited by 3 publications

References 20 publications

A bedded deposit of anthophyllite schist in the Precambrian belt of Nellore, South India

A bedded deposit of anthophyllite schist in the Precambrian belt of Nellore, South India

P–T estimates from the Nellore schist belt (India) and evidence for superimposed metamorphic events

Major-Element Geochemistry and Fe3+/ΣFe of Metabasites

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