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Open AccessArticle

Contribution to the Mineral Chemistry of the Proterozoic Aravalli Mafic Meta-Volcanic Rocks from Rajasthan, NW India

1
Environmental Geology Department, Polish Geological Institute-National Research Institute, Rakowiecka 4 Str., 00-975 Warsaw, Poland
2
Institute of Geochemistry, Mineralogy and Petrology, Faculty of Geology, University of Warsaw, Żwirki i Wigury 93 Str., 02-089 Warsaw, Poland
3
Micro-area Analysis Laboratory, Polish Geological Institute-National Research Institute, Rakowiecka 4 Str., 00-975 Warsaw, Poland
4
Department of Geology, University of Delhi, 110067 Delhi, India
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(7), 638; https://doi.org/10.3390/min10070638
Received: 10 June 2020 / Revised: 14 July 2020 / Accepted: 16 July 2020 / Published: 18 July 2020
(This article belongs to the Section Mineral Geochemistry and Geochronology)
Field, petrological and mineral chemistry for meta-volcanic rocks from the Aravalli sequence (Aravalli Craton, India) are presented. Field evidence such as volcanic flows and suspect pillow lava structures, dominant Fe-tholeiite lava flows intercalated with quartzites and argillaceous sediments, indicate rift tectonic environment. Primary mineralogy was obliterated during post-magmatic processes such as metamorphism corresponding to the greenschist to lower amphibolite facies conditions. The rock’s mineral composition was overprinted by plagioclase–chlorite–amphibole–epidote assemblage. The relicts of clinopyroxene were observed. The P-T estimation indicates a temperature of 550–600 °C for the pressure ranging from 3.0 to 7.0 kbar for the majority of amphiboles and 8.0–10.7 kbar for the minority. Geochemically, these rocks are komatiitic (picritic) and high-Fe tholeiitic basalts with 45.06−59.2 wt.% SiO2 and MgO content from 5 to 22.4 wt.% and Mg# of 17 to 71. They show large-ion lithophile elements (LILE) and light rare-earth elements (LREE) enrichment. Chondrite normalized rare-earth elements (REE) patterns for the Aravalli lava are moderately enriched with (La/Sm)N = 1.1−3.85, (La/Yb)N from 1.49 (komatiites) to 14.91 (komatiitic basalts). The trace element systematics with the negative Nb, P and Zr anomalies reflect their derivation from enriched sub-continental lithospheric sources, although minor crustal contamination cannot be ruled out. Aravalli rocks are considered to represent the transition from continental rift magmatism to shallow submarine eruption. View Full-Text
Keywords: pillow lava; Fe-tholeiite; basaltic komatiite; Aravalli craton pillow lava; Fe-tholeiite; basaltic komatiite; Aravalli craton
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MDPI and ACS Style

Wiszniewska, J.; Grabarczyk, A.; Krzemińska, E.; Ahmad, T. Contribution to the Mineral Chemistry of the Proterozoic Aravalli Mafic Meta-Volcanic Rocks from Rajasthan, NW India. Minerals 2020, 10, 638. https://doi.org/10.3390/min10070638

AMA Style

Wiszniewska J, Grabarczyk A, Krzemińska E, Ahmad T. Contribution to the Mineral Chemistry of the Proterozoic Aravalli Mafic Meta-Volcanic Rocks from Rajasthan, NW India. Minerals. 2020; 10(7):638. https://doi.org/10.3390/min10070638

Chicago/Turabian Style

Wiszniewska, Janina; Grabarczyk, Anna; Krzemińska, Ewa; Ahmad, Talat. 2020. "Contribution to the Mineral Chemistry of the Proterozoic Aravalli Mafic Meta-Volcanic Rocks from Rajasthan, NW India" Minerals 10, no. 7: 638. https://doi.org/10.3390/min10070638

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