Petrological and Geochemical Constraints in the Origin and Associated Mineralization of A-Type Granite Suite of the Dhiran Area, Northwestern Peninsular India

Abstract The Verena Granite forms part of the Palaeoproterozoic Lebowa Granite Suite of the Bushveld Complex and was named after the village of Verena in the Mpumalanga Province of South Africa. It occurs over an area of ~600 km2 and is intrusive into the Rooiberg Group, the Rashoop Granophyre Suite and the Klipkloof Granite. It is in turn intruded by the Makhutso Granite, the youngest known granite of the Lebowa Granite Suite. The Verena Granite is characterised by its coarse to very coarse-grained nature, its pinkish to reddish colours and its porphyritic texture defined by the presence of large perthitic K-feldspar phenocrysts within a finer grained groundmass of plagioclase (An8-15) and quartz. Geochemically it can be classified as an A-type granite that straddles the boundary between metaluminous and peraluminous compositions. The granite is enriched in REEs relative to chondrite and shows strong fractionation of the LREEs, a distinct negative Eu anomaly and little fractionation of the HREEs. U-Pb dating presented here places the age of the Verena Granite at 2052 ± 9 Ma, which is the same as that of the published 2054 ± 2 Ma age of the Nebo Granite. Currently no consensus exists regarding the petrogenesis of the Verena Granite. Doubts have been cast on a genetic link between the Verena Granite and the remainder of the Nebo Granite. A genetic link between the Klipkloof Granite and the Verena Granite appears likely, with the former possibly representing the rapidly chilled roof of the magmas that crystallised to form the latter. Lu-Hf isotope data on zircons are consistent with that from other units of the Lebowa Granite Suite. It also supports the unconventional model involving a common enriched mantle origin for all mafic and felsic units of the Bushveld Complex, with minimal input from older crust.

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Tracking S-type granite from source to emplacement: Clues from garnet in the Cape Granite Suite

Lithos ◽

10.1016/j.lithos.2009.02.011 ◽

2009 ◽

Vol 112 (3-4) ◽

pp. 217-235 ◽

Cited By ~ 69

Author(s):

Arnaud Villaros ◽

Gary Stevens ◽

Ian S. Buick

Keyword(s):

Type Granite ◽

Granite Suite

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The Topsails igneous suite, western Newfoundland; Fractionation and magma mixing in an “orogenic” A-type granite suite

Geological Society of America Special Papers - Ore-bearing Granite Systems; Petrogenesis and Mineralizing Processes ◽

10.1130/spe246-p287 ◽

1990 ◽

pp. 287-300 ◽

Cited By ~ 9

Author(s):

Joseph B. Whalen ◽

Kenneth L. Currie

Keyword(s):

Magma Mixing ◽

Type Granite ◽

Granite Suite

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GRANÁTICKÉ PÁSKOVANÉ ANOROGENNÍ GRANITY A PEGMATITY SUITY HLÍNA V BRUNOVISTULIKU – TEXTURY A PLOŠNÉ ROZŠÍŘENÍ

Geologické výzkumy na Moravě a ve Slezsku ◽

10.5817/gvms2012-1-2-141 ◽

2012 ◽

Vol 19 (1-2) ◽

Author(s):

Sven Hönig ◽

Jaromír Leichmann ◽

Tomáš Novosád

Keyword(s):

Type Granite ◽

Granite Suite

The SW part of the Brno Batholith as well as NE part of the Thaya batholith have undergone recent mapping focused on layered granite dykes belong to the Hlína A-type granite suite. Dykes cropping out throughout the both other granitic suites in the region (Réna I-type and Tetčice S-type) widespread more than 60 km in N–S direction. Structures of the Hlína granites are easily distinguishable by their layering parallel to the contact, alternating of major aplite-like zones and minor pegmatite-like zones with oriented UST comb-like Qtz, Pland Kfs. The lamination of the rock is pronounced by parallel stripe-like arrangement of the garnet. The purpose of text below is highlighted the volumetrically scarce but genetically very important part of the Brunovistulian unit.

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An occurrence of bavenite in the Cape Granite Suite, southwestern Cape Province, South Africa, and its implication on the formation of the host pegmatite

South African Journal of Geology ◽

10.25131/gssajg.120.2.223 ◽

2017 ◽

Vol 120 (2) ◽

pp. 223-230

Author(s):

R. Scheepers ◽

R.D. O'Brien ◽

A.E. Schoch

Keyword(s):

Minimum Temperature ◽

Mineral Chemistry ◽

Previous Description ◽

Late Precambrian ◽

Alteration Assemblage ◽

Mineral Occurrence ◽

Primary Fluid ◽

Type Granite ◽

Homogenization Temperatures ◽

Granite Suite

Abstract Bavenite, (Ca4[(Al,Be)4(Si9(O,OH)26-n)](OH)2+n), is present in a pegmatite of the Paarl Pluton, a metaluminous I-type granite of Late Precambrian age. We are not aware of any other previous description of a beryllium mineral occurrence in the Cape Granite Suite. The pegmatite consists essentially of quartz and microcline microperthite together with albite, calcite and fluorite. A hydrothermal alteration assemblage of epidote, chlorite and bavenite occurs in vugs and veins within the pegmatite. Stilbite, which is stable below 170ºC, is also present, but not texturally related to the alteration assemblage. Microthermometric analyses and mineral chemistry of associated minerals elucidate the conditions of formation for the bavenite. According to primary fluid inclusions in the cores of euhedral quartz, the minimum temperature of crystallization of the pegmatite is 450ºC. Homogenization temperatures of later fluids indicate a minimum temperature of 210ºC for the main hydrothermal event. Chlorite geothermometry yields crystallization temperatures around 320ºC. The bavenite formed between 210ºC and 320ºC, at a pressure of less than 2 kbar.

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Archean granitoids of India: windows into early Earth tectonics – an introduction

Geological Society London Special Publications ◽

10.1144/sp489-2020-155 ◽

2020 ◽

Vol 489 (1) ◽

pp. 1-13

Author(s):

Sukanta Dey ◽

Jean-François Moyen

Keyword(s):

Early Earth ◽

Plate Tectonic ◽

Peninsular India ◽

Global Issues ◽

Dominant Component ◽

Show Evidence ◽

Anatectic Granite ◽

Geodynamic Processes ◽

Type Granite ◽

Terrane Accretion

AbstractGranitoids form the dominant component of Archean cratons. They are generated by partial melting of diverse crustal and mantle sources and subsequent differentiation of the primary magmas, and are formed through a variety of geodynamic processes. Granitoids, therefore, are important archives for early Earth lithospheric evolution. Peninsular India comprises five cratonic blocks bordered by mobile belts. The cratons that stabilized during the Paleoarchean–Mesoarchean (Singhbhum and Western Dharwar) recorded mostly diapirism or sagduction tectonics. Conversely, cratons that stabilized during the late Neoarchean (Eastern Dharwar, Bundelkhand, Bastar and Aravalli) show evidence consistent with terrane accretion–collision in a convergent setting. Thus, the Indian cratons provide testimony to a transition from a dominantly pre-plate tectonic regime in the Paleoarchean–Mesoarchean to a plate-tectonic-like regime in the late Neoarchean. Despite this diversity, all five cratons had a similar petrological evolution with a long period (250–850 myr) of episodic tonalite–trondhjemite–granodiorite (TTG) magmatism followed by a shorter period (30–100 myr) of granitoid diversification (sanukitoid, K-rich anatectic granite and A-type granite) with signatures of input from both mantle and crust. The contributions of this Special Publication cover diverse granitoid-related themes, highlighting the potential of Indian cratons in addressing global issues of Archean crustal evolution.

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