ARAVALLI SUPERGROUP.ppt for the study purpose

Supergroup

1. Presented to: Presented by:
Dr. V. Perumal, A.ATHAVAN SERAL
Teaching Assistant, I M.Sc Geology,
Alagappa University, Alagappa University,
Karaikudi. Karaikudi.

2. INTRODUCTION
•The Aravalli Supergroup is the succession of
layered rocks of Palaeoproterozoic Time.
•These rocks are mostly low grade
metamorphosed sedimentary rocks.
•It occupies NW part of Indian Shield covering an
area of over 1 lakh sq. km.
•It consists of Mewar craton in the East and Marwar
craton in the West.
•Aravalli craton is bounded to the east by Great
Boundary Fault, to the west by Sands of Thar
Desert, to the north by Indo – Gangetic alluvium
and to the south by Son - Narmada – Tapti
lineament.
•Predominantly consists of quartzites, marbles,
pelites, greywackes and volcanoes exposed in
Aravalli – Delhi orogen.

3. STRATIGRAPHIC SUCCESSION OF THE
ARAVALLI SUPERGROUP

5. PRESENT CLASSIFICATION OF ARAVALLI
SUPERGROUP
Champaner Group
Lunavada Group
Jharol Group
ARAVALLI SUPERGROUP Udaipur Group
Debari Group
Delwara Group
- - - - - Unconformity - - - - -
Mangalwar or Sandmata Complex
Newar Gneiss with enclaves of Jagat Group

6. LITHOLOGY
DELWARA GROUP:
•It has an area over 300 km with an average width of about 500 km.
•The basement rock is orthoquartzite which overlain by volcanic
conglomerate (volcanic unit).
DELBARI GROUP:
•It overlain the Delwara Group consists of a thick horizon of petromict
conglomerate, pebble arkose, feldspatic quartzite.
•The conglomerate has a maximum thickness of 2500 m near Dabari.

7. UDAIPUR GROUP:
•It consists of thick accumulation of greywacke – phyllite intercalated
with chemogenic and biogenic rocks.
•The greywacke – phyllite is overlain by dolomite associated with
carbonaceous phyllite and quartzite
JHAROL GROUP:
•It consists of thick sequence of carbonate – free phyllite and arenite has
an area of 200 km with a width of 40 km.

8. LUNAVADA GROUP:
•It occupy the polygonal area in the south of the Aravalli orogen.
•The bulk of the group consists of greywacke – phyllite with associated quartz arenite.
•The stratigraphy of the Luna group is not clearly established.
CHAMPANER GROUP:
•It occurs as rectangular outcrop and consists of sub greywacke, siliceous phyllite,
pelitic schist, quartzite and petromict conglomerate.
•It is folded into an anticlinorium plunging to the west.
•The stratigraphy status is unclear because it is separated by the main fold belt.

9. DISTRIBUTION
•The Aravalli Supergroup of rocks are distributed
around south east of Rajasthan.
•The base of these rocks is the Mewar Gneiss
Complex and is overlain by the Delhi
Supergroup of rocks.
•The type area of Aravalli supergroup is Udaipur.
•General trend of these rocks is NE – SW.
•Aravalli mountains extending from Delhi in the
northeast to the gulf of Cambay in the southwest
constitute an important orogenic feature of the
northwest Penisula.

10. ECONOMIC IMPORTANCE
•Rock phosphate
•Zawar Pb – Zn – Ag
•Talc and pyrophyllite
•Rikhabdev serpentinite
The major economic deposits are:
•Gypsum
•Marble
•Mica
•Copper
•Tungsten.

11. NON – METALLIC DEPOSITS:
•Kyanite
•Apatite
•Asbestos
•Beryl
FOSSIL CONTENT:
Stromatolite content shows presence of blue green algae or
cyanobacteria.