 | | Journal (article/letter/editorial) | | 84~856 Two morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India B. R. NAYAKAND B. K. MOHAPATRA...Laboratory, Bhubaneswar - 751 013, Orissa, India ABSTRACT Pyrophanite is widely distributed in metamorphic...Mn-rich rock assemblages of the Gangpur Group, India. It occurs in two distinct habits: as an independent...and ferrous states. The two morphologies of pyrophanite attest to their formation under different environmental...environmental conditions. The independent pyrophanite is formed from a Mn-Ti rich precursor under low oxygen |  | | Journal (article/letter/editorial) | | genesis of Nishikhal manganese ores of South Orissa, India Received: 14 March 1995 / Accepted: 11 April 1996...Precambrian Eastern Ghats complex of south Orissa, India. Manganese minerals recorded are cryptomelane, romanechite...hausmannite, braunite, lithiophorite, birnessite and pyrophanite. Goethite, graphite, hematite and magnetite are...manganese formation at Nishikhal, south Orissa, India, occurs in a high grade metamorphic terrain (granulite...Research Laboratory (CSIR) Bhubaneswar-751 013, India plex of Precambrian age. The Nishikhal deposit |  | | Journal (article/letter/editorial) | | Printed in USA. Notes First occurrence of pyrophanite (MnTi03) and baddeleyite (Zr02) in an ordinary...8/lm) of baddeleyite (Zr02). Two end-member pyrophanite grains (MnTt03) occur in the outer portion of...the fragmenL This is the first occurrence of pyrophanite and baddeleyite in an ordimuy chondrite. Although...compositions of ilmenite in ordinary chondrites and pyrophanite in Ragoli. INTRODUCflON The ilmenite mineral...ecandrewsite (ZnTi03) and pyrophanite (MnTi03)' The latter phase, pyrophanite, is a rare mineral first |  | | Journal (article/letter/editorial) | | Jg. 2003 (7) 302– 320 Stuttgart, Juli 2003 Pyrophanite and high Mn ilmenite discovered in the Cretaceous...Sasaki, K., Nakashima, K. & Kanisawa, S. (2003): Pyrophanite and high Mn ilmenite discovered in the Cretaceous...Mh. 2003 (7): 302 – 320; Stuttgart. Abstract: Pyrophanite and high Mn ilmenite have been discovered in...volatile-rich highly oxidized conditions. The pyrophanite crystallized in the greatly differentiated facies...magma. Key words: Tono pluton, Fe –Ti oxides, pyrophanite, ilmenite, magnetite, hematite, oxidation, volatile |  | | Journal (article/letter/editorial) | | from a number of Precambrian shields, including India (e.g. Roy, 1968, 1973, 1981; Roy and Purkait, 1968)...oxides? 'Clay' Ilmenite ~ Pseudorutile (Psrt)* Pyrophanite Rutile Apatite Sphene Pyrrhotite Chalcopyrite...equilibrated from stilpnomelane to manganophyllite. Pyrophanite, ilmenite a n d alteration products. Very small...small, idiomorphic grains of pyrophanite occur in domains rich in quartz and are associated with spessartine...spessartine and 'stilpnomelane'. Pyrophanite has an ilmenite-type structure; in the reported assemblage |  | | Journal (article/letter/editorial) | | ADJACENT HIGH GRADE METAMORPHIC TERRAINS OF PENINSULAR INDIA A STUDY IN SIMILARITY AND CONTRAST S.C. S A R K...Sciences, Jadavpur University, Calcutta 700032 (India) (Accepted October 2, 1987) Abstract Sarkar, S...adjacent high grade metamorphic terrains of Peninsular India -- a study in similarity and contrast. Precambrian...adjacent areas of Tamil Nadu and Andhra Pradesh in Peninsular India are characterized by sublinear 'greenstone...aspects of the Precambrian geology of Peninsular India. Interest in t h e m has never been exhausted, ever |
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