Open AccessJournal Article
Petrogenesis of Quartz-Bearing Syenite Occurring Within Nepheline Syenite of the Elchuru Alkaline Complex, Prakasam Province, Andhra Pradesh
J. Ratnakar,K. Vijaya Kumar +1 more
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TLDR
A petrochemical comparison of the QS and NS suggests that they are derived from a feldspathic residual liquid by liquid immiscibility under variable P H 2 O and P CO 2 conditions as mentioned in this paper.Abstract:
A quartz-bearing syenite (QS) dyke cuts across the nepheline syenite (NS) in the Elchuru alkaline complex. The QS is leucocratic, medium grained and hypidiomorphic in texture. It is composed of K-feldspar, albite, amphibole, biotite and quartz. The QS has higher amounts of SiO 2 Al 2 O 3 and Na 2 O and, lower CaO and K 2 O than the average quartz syenite. The QS is metaluminous and oversaturated-in character. It has higher concentrations of Ga, Zr, Hf, Ta, V, Cr and U and, lower Ba, Rb, Sr, Y, Nb, Zn, Pb, Sc, Co, Ni and Th than fhe NS . The QS exhibits LREE-emiched and HREE-depleted pattern with a conspicuous negative Eu anomaly. The normalised incompatible trace element abundance pattern of the QS shows spikes for Ba, Ta and Y. A petrochemical comparison of the QS and NS suggests that they are derived from a feldspathic residual liquid by liquid immiscibility under variable P H 2 O and P CO 2 conditions. This process mimics "branching differentiation" mechanism.read more
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Mesoproterozoic rift-related alkaline magmatism at Elchuru, Prakasam Alkaline Province, SE India
TL;DR: The Elchuru alkaline complex in the Prakasam igneous province represents one occurrence of several alkaline bodies within the craton-Eastern Ghats Belt contact zone in Peninsular India.
Journal ArticleDOI
The Chimakurti, Errakonda, and Uppalapadu plutons, Eastern Ghats Belt, India : an unusual association of tholeiitic and alkaline magmatism
TL;DR: The Uppalapadu nepheline syenites were derived from an alkaline (basanitic) parental magma as discussed by the authors. But they were not interpreted as a differentiate or partial melt of a tholeiitic source.
Journal ArticleDOI
New SHRIMP Age and Microstructures from a Deformed A-Type Granite, Kanigiri, Southern India: Constraining the Hiatus between Orogenic Closure and Postorogenic Rifting
TL;DR: A new U-Pb zircon SHRIMP age of 1284 Ma from the Kanigiri granite, India is reported to help constrain the middle to late Mesoproterozoic tectonic evolution of the Nellore schist belt.
Journal ArticleDOI
Geochemistry and Sr–Nd isotopic studies of Paleoproterozoic (c. 2.3 Ga) meta-lamprophyre from the Rapuru area, Nellore Schist Belt, southern India: implications for back-arc basin magmatism and its relevance to the Columbia supercontinent assembly
Tushar Meshram,S. N. Mahapatro,J. K. Aravind,M. L. Dora,Srinivasa Rao Baswani,G. Gopalakrishna,Rajkumar Meshram,V. V. Sesha Sai,Kirtikumar Randive,Jitendra K. Dash +9 more
TL;DR: In this article, two lamprophyre dykes from the Rapuru area along the margin of the Eastern Dharwar Craton (EDC) and the Nellore Schist Belt (NSB) are reported.
Journal ArticleDOI
Geochemistry and ore potential of the Almoughlagh batholith, western Iran
TL;DR: In this article, a comparison of the compositions of the Almoughlagh batholith and the pluton with its Cu, Mo, Fe, Sn, W, Au, and Zn skarn deposits indicates that the Baba Ali diorite geochemically shows much resemblance with those which could bring about Fe-Cu skarn mineralization.
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