Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

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• 作者：N. V. Chalapathi Rao ; Atiullah ; Alok Kumar ; Samarendra Sahoo…
• 刊名：Mineralogy and Petrology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：110
• 期：2-3
• 页码：247-268
• 全文大小：1,531 KB
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• 作者单位：N. V. Chalapathi Rao (1)
  Atiullah (1)
  Alok Kumar (1)
  Samarendra Sahoo (1)
  Purnendu Nanda (1)
  Ngazimpi Chahong (1)
  B. Lehmann (2)
  K. V. S. Rao (3)
  
  1. Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi, 221005, India
  2. Mineral Resources, Technical University of Clausthal, 38678, Clausthal-Zellerfeld, Germany
  3. De Beers India Exploration, 36/A, Peenya Industrial Area, II nd Phase, Bangalore, 560058, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineralogy
  Geochemistry
  
• 出版者：Springer Wien
• ISSN：1438-1168

文摘

We report mineral chemistry and whole-rock major and trace-element geochemistry for a recent find of Mesoproterozoic (~1.4 Ga) lamproites from the Garledinne (Banganapalle) cluster, south-western part of the Paleo-Mesoproterozoic Cuddapah Basin, southern India. The Garledinne lamproites occur as WNW–ESE-trending dykes that have undergone varying degree of pervasive silicification and carbonate alteration. Nevertheless, their overall texture and relict mineralogy remain intact and provide important insights into the nature of their magmas. The lamproite dykes have porphyritic to weakly porphyritic textures comprising pseudomorphed olivine macrocrysts and microphenocrysts, titanian phlogopite microphenocrysts, spinel having a compositional range from chromite to rarely magnesiochromite, Sr-rich apatite and niobian rutile. The Garledinne and other Cuddapah Basin lamproites (Chelima and Zangamarajupalle) collectively lack sanidine, clinopyroxene, potassic richterite, and titanite and are thus mineralogically distinct from the nearby Mesoproterozoic lamproites (Krishna and Ramadugu) in the Eastern Dharwar Craton, southern India. The strong correlation between various major and trace elements coupled with high abundances of incompatible and compatible trace elements imply that alteration and crustal contamination have had a limited effect on the whole-rock geochemistry (apart from K₂O and CaO) of the Garledinne lamproites and that olivine fractionation played an important role in their evolution. The Garledinne lamproites represent small-degree partial melts derived from a refractory (previously melt extracted) peridotitic mantle source that was subsequently metasomatised (enriched) by carbonate–rich fluids/melts within the garnet stability field. The involvement of multiple reservoirs (sub-continental lithospheric mantle and asthenosphere) has been inferred in their genesis. The emplacement of the Garledinne lamproites is linked to extensional events, across the various Indian cratons, related to the break-up of the Proterozoic supercontinent of Columbia.