• Sanjeevani Jawadand

The Chhota Udaipur Alkaline-Carbonatite Subprovince (CUACS) lies in the lower extents of the E-W trending Narmada rift valley, stretching an area of about 1,200 km2. The CUACS has strong imprint on the structures which are the artifact of major Narmada lineament (rift valley). Based on the observable field relationships and their interpretations viz., physical characteristics, principle of inclusions and the principle of cross-cutting, the relative ages of intrusive igneous rocks present in the CUACS were established. The map pattern suggests that the dykes trending at an angle with one another would crossed each other and such intrusive relationship. One set of faults runs parallel to the Narmada, while the other runs perpendicular; these faults are contemporaneous and have oblique cross-cutting at 1200. However, apart from two locations, the direct field evidence of temporal hierarchy between intrusive could not be established. The dykes trending in EW and NW-SE directions are of, by and large, similar compositions, those trending ENE-WSW direction are of mostly calcareo-siliceous dykes. It is, therefore, possible that there may be some time gap between two events. Based on the surface evidences, it is possible to affirm that the calcareosiliceous dykes are younger than the lamprophyre, picrobasalt, carbonatite and alkaline rocks occurring in the area.

Chhota Udaipur Alkaline-Carbonatite Sub-Province, dykes, field evidences

"Field evidences as a tool to determine space – time relationships of intrusive rocks of Chhota Udaipur Alkaline-Carbonatite Sub-Province, Lower Narmada Valley, Deccan Large Igneous Province, India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 10, page no.e436-e443, October-2022, Available :http://www.jetir.org/papers/JETIR2210464.pdf

"Field evidences as a tool to determine space – time relationships of intrusive rocks of Chhota Udaipur Alkaline-Carbonatite Sub-Province, Lower Narmada Valley, Deccan Large Igneous Province, India", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 10, page no. ppe436-e443, October-2022, Available at : http://www.jetir.org/papers/JETIR2210464.pdf