Rajasthan Geology field.pptx

The Field work was carried by 4th Semester Students batch 2021, Department of Earth Sciences University of Kashmir, Srinagar in the month of March 2023 at different places of Rajasthan, India.
the fieldwork was carried under the supervision of Dr Prof Riyaz Ahmad , Dr Shafi and GSI traning Institute Zawar

1. Field Report Presentation (Field training conducted in the different locations of Rajasthan in the month of March 2023) Presentation by: Muzzamil Ahmad Khanday Enrollment Number: 21064120002 Batch: 2021 Under the joint supervision of: Dr. Reyaz Ahmad Dar Dr. Mohd Shafi Bhat PG DEPARTMENT OF EARTH SCIENCES University of Kashmir, Srinagar – 190006

2. 7 TH March Visit to the Geological Survey of India Office in Jammu 9 TH March Visit to Department of Geology, J.N. Vyas University Jodhpur 10 TH March Carried field work near Mehrangarh Fort, Jodhpur. 4. 11 TH March Carried field work at Sandstone Mine Sursagar , Jodhpur. 5. 12 TH March Carried field work at Barna Mines. 6. 13 TH March Carried field work at Osian Desert. 7. 15 TH March Carried field work near Berach River Chittorgarh 8. 16 TH March Visited Chittorgarh Fort. 9. 18 TH March Carried field work across Tiri River ( Bhandal ) 10. 19 TH March Carreid field work near Mochia Hill, Do- Nadi along Tiri River. 11. 20 TH March Carried field work at Rava Area DATE LOCATION Field Training Schedule

3. Visit to the Geological Survey of India , Office in Jammu Tusk of Stegodon Ganesha Elephant Teeth Stromatolite Retorts Visit to Jai Narain Vyas University, Jodhpur Corals Spiriferida

4. TRAVERSE 1 ( Jodhpur) MEHRANGARH FORT Spot: 01 Jodhpur Malani Igneous Suite Marks the last phase of Igneous activity of Precambrian age in Indian Subcontinent Rhyolite is overlying by Sedimentary Sequence of Late Proterozoic age, it also forms the basement rocks for the Marwar Basin . GSI has declared this site as National Geological Monument Visible reaction rims formed between acidic and basic composition of the rock. Ignimbrites can be seen, formed from deposits of pyroclastic flows, rocks show columnar jointing with four sets of joints. Malani Igneous Rock Reaction Rim Ignimbrite (Welded tuff)

5. HANUMAN TEKRI Spot: 02 Unconformable contact between red Malani Rhyolite and Sonia Sandstone of Marwar Supergroup , best example of Non-conformity Towards top of the section of Sonia sandstone graded and cross beddings are clearly visible, the top most section also consists a layer of conglomerates. Presence of Ediacaran fossils, star-shaped in appearence named as Hiemalora Cross bedding Contact between Rhyolite and Sonia Sandstone

6. SANDSTONE MINE (SURSAGAR) 10-20 m thick succession of Jodhpur Sandstone referred as Sonia Sandstone. Ripple marks are characteristics of shallow water deposition. R ocks progressively show gradation in the size of grains, fining upward. Alternation between cross-stratification and plane lamination in sandstone. Darker beds depict the more oxidizing type of environment. Graded Bedding Ripple marks Hiemalora (Fossil) Cross Stratification Aspidella Ripple marks (asymmetrical)

7. BARNA MINES The outcrop belongs to Bilara Group which is middle part of Marwar Supergroup and is made up of calcarous facies with domination of dolomite and limestone. Folding is prominent structure, area is tectonically active. Limestones with stromatolites are present these are of pre- cambrain age and are found in the shallow marine environment because they need light to perform photosynthesis. Geode a re found in some of the limestones.They are geologically secondary formations within sedimentary and volcanic rocks. Stromatolitic Limestone Folding ( in Bilara Group ) Geode

8. TRAVERSE: 02 ( Chittorgarh ) BERACH RIVER Great Boundary Fault runs between Vindhyan and Aravalli mountain range and is almost parallel to Berach River in Chittorgarh . The rocks along the river are shales and sandstones which are highly deformed and weathered. In the N-W of Berach River there is an exposure of Berach Granite outcrop, which is coarse grained ( Porphyritic) texture with large interlocking crystals of white quartz, white to dark pink feldspar and dark micas. The grains are roughly equal sized . The age of granite is about 2.5 BY Sheared Sandstone   Folds Granite ( Berach ) Berach Granite (Outcrop )

9. CHITTORGARH FORT The basement rock is shale, while moving towards the top of the fort the lithology changes from sheared shale to sandstone. The sharing is less while moving away from Berach river to fort. At some places shales are overlying by quartzite depicts metamorphism of sandstone has taken place. Sandstones have preserved various sedimentary structures, like ripple marks, cross and horizontal bedding/lamination. Horizontal Bedding Shale Beds Quartzite Cross Bedding

10. TRAVERSE: 03 (Udaipur) TIRI RIVER Spot: 01 Lithology: Low-grade metamorphic rocks mostly phyllite intercalated quartzite. The formation is P recambrain in age, forms lower Aravalli . The metamorphic belt extends along Udaipur-Ahmadabad highway. Different secondary structures are developed, like pencil structure, tensional gashes, joint sets . Tension gashes are formed in Ductile shear zones, filled with (mostly) Calcite or Quartz. Their orientation reflects the stress field experienced by rocks. Different cleavage planes are developed in Phyllite , depicts the different events of deformation. Pencil Cleavage Tension gashes ((Outcrop) Phyllite Outcrop

11. Mochia Hill provides a valuable insights into the tectonic history and geological evolution of the area. It has developed different classes of folding. John Ramsay's Fold Classification : based upon curvature of the inner and outer lines of a fold, and the behavior of dip isogons. Signposts of the Gossans can be seen at different places in the area. Gossans form by the oxidation and leaching-out of the sulphides and carbonates, leaving hydrated iron oxides, they thus may be used as clues to existence of subsurface ore deposits. Tight Folds Open Folds Chevron Fold Gossans (Leached Zone)

12. Thank You!