Cambrian Orogenic Belt in East Antarctica and Sri Lanka: Implications for Gondwana Assembly

1994 ◽  
Vol 102 (1) ◽  
pp. 47-65 ◽  
Author(s):  
K. Shiraishi ◽  
D. J. Ellis ◽  
Y. Hiroi ◽  
C. M. Fanning ◽  
Y. Motoyoshi ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Orogenic Belt ◽  
East Antarctica

Cambrian Orogenic Belt in East Antarctica and Sri Lanka: Implications for Gondwana Assembly: A Reply

1995 ◽  
Vol 103 (4) ◽  
pp. 469-471
Author(s):  
K. Shiraishi ◽  
D. J. Ellis ◽  
Y. Hiroi ◽  
C. M. Fanning ◽  
Y. Motoyoshi ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Orogenic Belt ◽  
East Antarctica

First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India

1995 ◽  
Vol 132 (3) ◽  
pp. 253-260 ◽  
Author(s):  
C. Unnikrishnan-Warrier ◽  
M. Santosh ◽  
M. Yoshida
Keyword(s):  
Sri Lanka ◽  
Shear Zone ◽  
East Antarctica ◽  
Southern India ◽  
Peninsular India ◽  
Pan African ◽  
Mineral Isochron ◽  
Nd Model Age ◽  
Tectonothermal Event ◽  
Good Agreement

AbstractMineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm—Nd and Rb—Sr ages of 517 ± 26 Ma and 484 ± 15 Ma respectively. The Nd model age calculated for the charnockite is c. 2100 Ma. Our study reports the first Pan-African mineral isochron ages from regional charnockites of Peninsular India, which are in good agreement with the recently obtained ages of incipient charnockites in the adjacent blocks, as well as alkaline plutons within the same block. Our results indicate that the Pan-African tectonothermal event in the granulite blocks south of the Palghat—Cauvery shear zone was regional, with terrain-wide rejuvenation. These results correlate with similar Pan-African tectono-thermal events reported from Sri Lanka and East Antarctica, and have an important bearing on Gondwana reconstructions.

Sign in / Sign up

Export Citation Format

Share Document