Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T22:28:24.777Z Has data issue: false hasContentIssue false
  • English
  • Français

Paragenesis of staurolite in pelitic schists of Kishangarh, District Ajmer, India

Published online by Cambridge University Press:  05 July 2018

R. K. Lal  and
R. S. Shukla
R. K. Lal
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
R. S. Shukla
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
Get access Rights & Permissions [Opens in a new window]

Summary

The staurolite-bearing schists of the area were metamorphosed in the staurolite-kyanite zone of the amphibolite facies. The various assemblages of the pelitic schists are represented in the AKF and Thompson's AFM diagrams. Within the PT conditions of stability of staurolite, this mineral develops in pelitic schists that have a high Al2O3 (excess)/(K2O+FeO+MgO) ratio so that the plots of analyses lie above the muscovite-garnet join in the AKF diagram. The three-phase field of staurolite-kyanite-biotite in the AFM diagram migrates towards the lower FeO/MgO side with increasing oxidation ratio and thus staurolite-bearing rocks are not necessarily restricted to pelitic schists with high FeO/MgO ratio as is commonly believed. On the other hand, the three-phase field shifts towards the higher FeO/MgO side with increasing grade of metamorphism assuming oxidation ratio and pressure to be constant, thus reducing the composition field of staurolite schists in the AFM diagram.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 561 - 567
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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

Chinner, (G. A.), 1960. Journ. Petrology, 1, 178.CrossRefGoogle Scholar
Chinner, (G. A.), 1965. Min. Mag. 34, 132.Google Scholar
Deer, (W. A.), Howie, (R. A.), and Zussman, (J.), 1962. Rock-Forming Minerals, 2, London (Longmans).Google Scholar
Ganguli, (J.), 1968. Amer. Journ. Sci. 266, 277.CrossRefGoogle Scholar
Green, (J. C.), 1963. Amer. Min. 48, 991.Google Scholar
Hounslow, (A. W.) and Moore, (J. M.), 1966. Geological Paper 66- I Dept. of Geology, Carleton University, Ottawa, Canada.Google Scholar
Hounslow, (A. W.) and Moore, (J. M.), 1967. Journ. Petrology, 8, 1.CrossRefGoogle Scholar
Lal, (R. K.), 1969 . Publication of the Centre of Advanced study in Geology, Chandigarh, India, no. 6, 55.Google Scholar
Niyogi, (D.), 1965. Wadia commemorative volume, Mining, Geological & Metallurgical Institute of India, p. 458.Google Scholar
Pettijohn, (F. J.), 1957. Sedimentary Rocks, 2nd edn. (Harpers Brothers).Google Scholar
Richardson, (S. W.), 1967. Geophysical Lab. Year Book, 66, 398.Google Scholar
Richardson, (S. W.), 1968. Journ. Petrology, 9, 467.CrossRefGoogle Scholar
Shapiro, (L.) and Brannock, (W. W.), 1956. U.S. Geol. Surv. Bull. 1036-C.Google Scholar
Shapiro, (L.) and Brannock, (W. W.), 1962. Ibid. 1144-A.Google Scholar
Shaw, (D. M.), 1956. Bull. Geol. Soc. Amer. 67, 919.CrossRefGoogle Scholar
Sturt, (B. A.), 1962. Journ. Petrology, 3, 181.CrossRefGoogle Scholar
Thompson, (J. B.) Jr., 1957. Amer. Min. 42, 842.Google Scholar
Turner, (F. J.), 1968. Metamorphic Petrology (McGraw-Hill).Google Scholar
Turner, (F. J.) and Verhoogen, (J.), 1960. Igneous and Metamorphic Petrology 2nd edn. (McGraw-Hill).Google Scholar
Winkler, (H. G. F.), 1965. Petrogenesis of Metamorphic Rocks. New York (Springer-Verlag).CrossRefGoogle Scholar