CITZ (Central Indian Tectonic Zone)

Precambrian basement of central India is made up of two cratonic domains, the Aravalli-Bundelkhand craton in the North and Bastar craton in the South. They are separated by a ENE-WSW trending Narmada-Son lineament. This zone has been named as Central India Tectonic Zone. CITZ contains fragments of both, the northern and the southern cratonic domains. It is traversed by four important crustal scale fault and shear zones in Central India (Son-Narmada North Fault, Son-Narmada South Fault, Tan Shear and Central India Shear).

—– SNNF —–

MAHAKOSHAL BELT

—– SNSF —–

BETUL BELT

—– TAN SHEAR —–

SAUSAR BELT

—– CIS —–

CITZ is bounded in the north by Son-Narmada North Fault and in the south by Central India Shear.
It contains Precambrian supracrystal sequences in primarily three belts : Mahakoshal belt, Betul belt, and Sausar belt fron north to south respectively.
Sausar and Betul belt show affinity with the Bastar Craton in the south while the Mahakoshal Belt is considered as a fragment of the Aravalli-Bundelkhand Craton lying to the north of the CITZ.

Mahakoshal Group :-

The supra-crustal sequence sequence that is named as Mahakoshal Group is divided into four formations. The age is 1.8-1.76 Ga.

The lower most unit is Sleemanabad Formation, consists of quartz arenite, carbonates and BIF.
It is overlain by Chitrangi Formation that consists of a succession of sub-aqueous mafic and ultramafic lava, magniferous chert.
The overlying sequence of predominantly graywacke and argellite with some interbeds of carbonaceous phyllite and quartz arenite is called Parsoi Formation.
The uppermost unit is Dudhmaniya Formation that is mainly argellite with thin intebeds and bends of BIF and magniferous chert.

Betul Belt :-

The supre-crustal sequence of Betul belt are unconformably overlain by the Gondwana Sequence and Deccan Trap from all sides except in the south where they are connected with gneissis rocks of the Sausar Belt. The rocks of Betul belt shows bi-modal volcanism.

The lower most unit is Golighat Group of quartzite, calc- silicate, marble, amphibolites occurring as enclaves in Amla Gneiss.

Amla Gneiss (1550 Ma)

Above Amla gneiss there is Bargaon Group with Pillow basalt, pyritiferous cherts, acid volcanics

Bhopali group is rests over the Bargaon and contains Dolomitic limestone, BIF, mia schist, and minor basic volcanics

Above all thos groups there are mafic intrusives and younger intrusive granites (850 Ma)

Sausar Belt :-

The Sausar belt lies adjacent to Sakoli belt, both were deposited in two separate adjoining basins in Centra India. The Sausar belt forms a curvilinear belt of intensily deformed and metamorphosed rocks around the Bastar Craton. It consists of two major litho-tectonic units, Tirodi Biotite Gneiss and the supracrustal sequence comprising Sausar Group.