Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-01T21:25:32.827Z Has data issue: false hasContentIssue false
  • English
  • Français

A bedded deposit of anthophyllite schist in the Precambrian belt of Nellore, South India

Published online by Cambridge University Press:  01 May 2009

T. Ramamohana Rao
T. Ramamohana Rao
Affiliation:
Geology DepartmentAndhra UniversityWaltairIndia
Get access Rights & Permissions [Opens in a new window]

Summary

A pure anthophyllite schist occurs as a bedded deposit conformable with garnet-bearing quartz—muscovite, and quartz—chlorite—biotite schists and diopside-bearing caic-silicate rocks in the north-central part of the Nellore Schist Belt. Field and petrochemical studies show that anthophyllite schist has formed from regional metamorphism of Fe-, Mg-rich aluminous sediments aided by metamorphic differentiation due to local kinematic action under amphibolite facies conditions which is the general grade of metamorphism of the Nellore Schist Belt. A pure anthophyllite schist of sedimentary origin reported here is the first of its kind described from any terrain.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 3 , May 1974 , pp. 221 - 228
Copyright
Copyright © Cambridge University Press 1974

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Amin, M. S. & Afria, M. S. 1954. Anthophyllite—vermiculite deposit of Hafafit, Eastern Desert. Egypt. Econ. Geol. 49, 317.CrossRefGoogle Scholar
Anderson, A. L. 1931. Genesis of anthophyllite deposits near Kamiah, Idaho. J. Geol. 39, 68.CrossRefGoogle Scholar
Aswathanarayana, U. 1964. Age Determination of Rocks and Geochronology of India. Broch. 22nd mt. Geol. Cong., New Delhi, 13 pp.Google Scholar
Babu, V. R. R. M. 1970. Petrology of metamorphic rocks of almandine-amphibolite facies in Saidapuram—Podalakura area, Nellore Dist., Andhra Pradesh. Tsch. Miner Petr. Mitt. 14, 171–94.CrossRefGoogle Scholar
Brammall, A. 1933. Syntexis and differentiation. Geol. Mag. 70, 97.CrossRefGoogle Scholar
Bugge, J. A. W. 1943. Geological and petrological investigation in the Kongsberg— Bamble formation. Norg. Geol. Undersok. 160, 83.Google Scholar
Collins, R. S. 1942. Cummingtonite and gedrite from Sutherland. Mineralog. Mag. 26, 254–9.Google Scholar
Eskola, P. 1914. On the Petrology of the Orijarvi region in southwestern Finland. Bull. Comm. Geol Finlande. 40, 169–77.Google Scholar
Fermor, L. L. 1936. An attempt at the correlation of the ancient schistose formations of the Peninsular India. Mem. geol. Surv. India 70, Pt I & II.Google Scholar
Hietanen, A. 1959. Kyanite—garnet—gedrite near Orofino, Idaho. Am. Miner. 44, 539.Google Scholar
Köhler, A. & Raaz, F. 1951. Über eine neue Berechmeng und graphische Darstellung von Geseins analysen. Neues Jh. Miner. Mh. 247–63.Google Scholar
Krishnan, M. S. 1960. Geology of India and Burma. Higginbothams & Co, Madras.Google Scholar
KuIp, J. L. & Brobst, D. A. 1954. Notes on the dunite and the geochemistry of vermiculite at the Day Book dunite deposit, Yancey County, North Carolina. Econ. Geol. 49, 211.Google Scholar
narayana Rao, M. & Choudhury, J. M. 1971. Preliminary studies on the multi-phase folding in the Precambrian of the Chundi area, Nellore. Q. J. Geol. Min. Metal. Soc. Ind. 43, 167.Google Scholar
Pascoe, E. H. 1950. A Manual of Geology of India and Burma, 3rd ed. Govt. of India Pub.Google Scholar
Pichamuthu, C. S. 1962. Some observations on the structure, metamorphism and geological evolution of Peninsular India. J. geol. Soc. India, 3, 106–18.Google Scholar
Pichamuthu, C. S. 1967. The Precambrian of India. Vol. 3. The Precambrian. Edited by Rankama, K.. John Wiley & Sons. 1–90.Google Scholar
Prider, R. T. 1944. The geology and petrology of part of the Toodyay district, Western Australia. J. R. Soc. W. Ausir. 28 (for 1941–1942), 83–137.Google Scholar
Rabbitt, J. C. 1948. A new study of the anthophyllite series. Am. Miner. 33, 263–323.Google Scholar
Roy, B. C. 1944. Nellore Mica Belt. Develop. Dept, Madras Govt G. O. No. 4477, D/20 11–44.Google Scholar
Sastry, A. V. R. & Vaidyanadhan, R. 1968. Structure and petrography of the quartz— magnetite and associated rocks of Vemparala area, Nellore District, Andhra Pradesh. J. geol. Soc. India 9, 49–57.Google Scholar
Seki, Y. & Yamasaki, M. 1957. Aluminiam ferroanthophyllite from the Kitakami mountain land, north-eastern Japan. Am. Miner. 42, 506.Google Scholar
Subramaniam, A. P. 1946. Progress Report for the Field Season. Develop. Dept, Madras Govt G. O. No. 3073, D/9–8–1946.Google Scholar
Tilley, C. E. 1937. Anthophyllite—cordierite granulites from the Lizard. Geol. Mag. 74, 300–9.CrossRefGoogle Scholar
Tuominen, H. V. & Mikkola, T. 1950. Metamorphic Mg—Fe enrichment in the Orijarvi region as related to folding. Bull. Comm. Geol. Finlande 150, 67.Google Scholar
Vinogradov, A., Tugarinov, A. et al. 1964. Geochronology of Indian Precambrian. Proc. 22nd Int. Geol. Cong., New Delhi, Section X, 553–67.Google Scholar