The bimodal Malani suite, West of Barmer, Rajasthan is characterized by discontinuous, ring shaped outcrops of Siwana peralkaline granite with minor outcrops of basalt. The peralkaline, within- plate and A-type nature of granite are evident by its chemical characteristics. The granite is characterized by high Na 2OtK 2O, Fe/Mg, Zr, Nb, Y, Zn ; low Al 2O 3, CaO and Sr and is significantly low in absolute abundance of trace and REE elements compared to type area Siwana granite. The granite is correlated to the "Pan-African" event and its petrogenesis and tectonic significance are discussed.
|Number of pages||9|
|Publication status||Published - Jan 2001|
- Bimodal suite
- Malani igneous suite
- Siwana granite