...M. K. Singh Abstract The paper concerns mainly with properties of packing of the Proterozoic Chandarpur and Khairagarh sandstones of Chhattisgarh Basin. An attempt has been made to decipher the nature of boundary between Chandarpur Group and overlying Raipur Group on the basis of grain packing...

... PHYSIOGRAPHICAL FEATURES The area is in general a flat country with an arcuate ridge towards east. The Khairagarh sandstone lenses in the shales form low isolated ridges, while the basal Chandarpurs have given rise to ridges with escarpments on the east and gentle slopes towards west. The average altitude...

...' between Parsori and Khairagarh. Maximum thickness for volcano-sedimentary pile filling the basin along this section is estimated to be around 2300m. The model also indicates possibility for the presence of a concealed high density formation (Pitepani Volcanics?) below Bortalao sandstones. Copyright ©...

... disposition of a few mappable sandstone units viz. at Deodongar-Rasmara and at Khairagarh. Further, the reconnaissance also reveals that the lithologic assemblage in the western sector is significantly different from that in the eastern part of the basin. The Chandarpur Group is thinner in the western part...

... that the estimated shortening value from the folds is a good first-hand approximation for the Khairagarh Group as a whole. In general the sandstones from the Bortalao Formation are coarser (> 0.028 mm or < 5 ϕ) than psammites from the Karutola Formation (< 0.019 mm or > 5.5 ϕ). Sandstones...

... by the writer (Dutt, 1958 and 1963) as a distinct stage. STRATIGRAPHY AND CORRELATION OF THE INDRAVATI SERIES 43 3. The Jagdalpur basal purple shale with quartzite intercalations is correlated with the Gunderdehi purple shale and the Raipur purple shale with intercalation of Khairagarh sandstone. The Khairagarh...

... along the Rajnandgaon–Chowki road ( fig. 2 ). Rocks of the Sonakhan Group also occur below the Chandarpur sandstone in parts of the Raipur district. The Chilpi Group, equivalent of the Khairagarh Group in the Rajnandgaon district, has a faulted contact with the Chhattisgarh Supergroup (Murti 1987...

... Description Tarenga Shale Purple shale with gypsum and bands of phosphorite Thickness : 180m .Khairagarh Sandstone Mainly sandstone Thickness: Variable Raipur Limestone Intercalation of shale and sandstone in limestone and dolomites. The carbonate rocks are mostly stromatolitic. Thickness: 670m. CHHAITISGARH...

... and volcaniclastic suites unconfonnably overtying all the older rock units. Chilpi rocks comprise polymict conglomerates, quartzites, marbles and tuffaceous phyllites. The Khairagarh Group comprises alternate basic volcanic and volcanoclasticcycles. The basal grit/sandstone ofthe Khairagarh Group (Bortalao Formation...

... as to have uranium resources outside Singhbhum. These efforts led to significant discoveries of uranium in Palaeoproterozoic metabasalts and metarhyolites at Bodal and Bhandaritola (1973-74) and Mesoproterozoic sandstones and conglomerates at Mogarra (early 1980s). The Dongargarh uranium province in central...

... 4.0 Thorium to potassium ratio (eTh/K low) Gabbro 1 8 8 0.8 Buffer 400 m 8 7 56 5.6 Laterite 1 8 8 0.8 Buffer 600 m 7 7 49 4.9 Sandstone 1 8 8 0.8 Buffer 800 m 6 7 42 4.2 Vein Quartz Alteration Buffer 400 m 9 9 81 8.1 Phyllic Buffer 800 m...

...%), metamorphite type deposits along the Singhbhum Shear Zone (~21%), unconformity related deposits in northern part of Cuddapah Basin (~5%) and sandstone type deposits in Cretaceous Mahadek Basin (~6%). Besides these, metasomatite type deposits along the North Delhi Fold Belt (4%) and granite related-structurally...

... reworking of Precambrian fluvial sediments has been described by a number of authors. Earlier researchers have reported aeolian reworking of fluvial quartz-rich sandstone unit of the Beasley River Quartzite Member of the Lower Wyloo Group (LWG). The Nummana Member is the topmost lithostratigraphic unit...

...- to Mesoproterozoic Khairagarh Group (upper parts of Kotri and Dongargarh Supergroups), Abujhmar Group, and equivalents Khairagarh Group: conglomerate-arkosic sandstone, mafic volcanics, arenitic sandstone-shale, mafic volcanics; Abujhmar Group: conglomerate, sandstone, shale, acid and mafic volcanics...

... of the Bartalao sandstone formation o f the Khairagarh group are locally known at Kolarghat, Udrichapar and a few other localities. The Sarguja-Palamau province is underlain by a migmatitic complex of granites, amphibolites. quartzites and schistose rocks which host significant mi~leralisation along shear zones...

... folding pha'5e (1200 m.y.) which affected the Bijli rhyolites with intertrappeans, is younger than the Sakoli Cycle I phase (1330 m.y The Khairagarh folding (600 m.y.) is youngl!r than the Sausar cycle, and the Chattisgarh 'Cuddapahs' are still younger. The younger Bailadila Group of Bastar District...