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UNCONFORMITY BY DHARMESH

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DharmeshDeshmukh

This document defines and describes different types of unconformities in geology. It begins by defining an unconformity as a break or gap in the geological record representing a period of erosion or non-deposition. It then describes the major types of unconformities, including angular, disconformity, non-conformity, and local unconformities. Finally, it outlines several ways that unconformities provide significance, such as indicating time intervals missing from the geological record, structural discordances between rock layers, evidence of past topography, and signs of weathering at the contact surface.

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UNCONFORMITY BY DHARMESH
CONTENTS….  Introduction  Definition  Plane of unconformity  Types of unconformities  Signification of Unconformities
 It is one of the most common Geological structure found in rocks.  Unconformity = Gaps in rock layers • From when layers of rocks are removed by erosion. • From when a period of time passes without any new deposition to produce new layer of rock. Introduction
Definition  A surface that represents a break in the rock record.  An unconformity may be defined as surface of the erosion or non-depositions occurring within the sequence of rock. An unconformity is developed due to the changes in the process of deposition of rocks.
Plane of unconformity  plane of unconformity is which the separation is a underlying (older) and overlaying (younger) rock strata's. plane of unconformity
Types of unconformities  Angular Unconformity.  Dis -conformity.  Non-conformity.  Local unconformity.  Blended unconformity  Para conformity  Buttress unconformity
Angular Unconformity  When the underlying (older) and overlaying (younger) rock strata's show some angle with respect to one another i.e. Angular unconformity. Y.R.B. P.O.U. O.R.B.
Disconformitiy  When underlying (older) and overlaying (younger) sedimentary rock strata's are parallel and contact plane is an erosion surface is called Disconformities Y.R.B. P.O.U. O.R.B.
Non-conformity  When underlying (older) rock are igneous or metamorphic and the overlaying (younger) rock are sedimentary this types unconformity is called Non-conformity.  Y.R.B.  P.O.U.  P.O.U. O.R.B.
Local Unconformity  It is similar to Disconformities but Local in extent and a short period of non-deposition.  The age between the underlying (older) and overlaying (younger) strata are very less this type of unconformity called Local unconformity.
Blended unconformity  An unconformity having no distinct surface of separation or sharp contact ,as at an erosion surface that was originally covered by thick residual soil, which graded downward into the underlying rocks and was partly incorporated in the overlaying rocks. Overlaying strata P.O.U. Underlying strata
Para conformity  A Para conformity is a type of unconformity in which there is no evidence of a gap in time, because the planes above and below the gap are parallel and there is no evidence of erosion. Y.R.B. P.O.U. O.L.B.
Buttress unconformity  A buttress unconformity is when younger is deposited against older strata thus influencing its bedding structure. Y.R.B. P.O.U. O.R.B.
Signification of Unconformity  Time interval  Structural discordance Topographic relief  Evidence of weathering at the unconformable surface
 Time interval :- 1 – Gap in paleontological record. 2 – Gap in stratigraphic record.
UNCONFORMITY BY DHARMESH
 Structural Discordance :- The truncation of sedimentary layers at the stratigraphic contact is an unmistakable evidence of discontinuity.
 topographic irregularity :- Disconformities preserve topography corresponding to all stage of the physiographic cycle ranging from undetected surface to near pep plains.
 Sharp contrast in the degree of indurations between the underlying and overlying rocks.  Difference in the grade of regional metamorphism of the underlying and overlaying rocks. Presence of basal conglomerate horizon suggest the existence of an unconformity.
THANK YOU… Gaining knowledge is not a EVENT … It is a PROCEDURE of HARDWORKING till a long PERIOD………

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UNCONFORMITY BY DHARMESH

  • 2. CONTENTS….  Introduction  Definition  Plane of unconformity  Types of unconformities  Signification of Unconformities
  • 3.  It is one of the most common Geological structure found in rocks.  Unconformity = Gaps in rock layers • From when layers of rocks are removed by erosion. • From when a period of time passes without any new deposition to produce new layer of rock. Introduction
  • 4. Definition  A surface that represents a break in the rock record.  An unconformity may be defined as surface of the erosion or non-depositions occurring within the sequence of rock. An unconformity is developed due to the changes in the process of deposition of rocks.
  • 5. Plane of unconformity  plane of unconformity is which the separation is a underlying (older) and overlaying (younger) rock strata's. plane of unconformity
  • 6. Types of unconformities  Angular Unconformity.  Dis -conformity.  Non-conformity.  Local unconformity.  Blended unconformity  Para conformity  Buttress unconformity
  • 7. Angular Unconformity  When the underlying (older) and overlaying (younger) rock strata's show some angle with respect to one another i.e. Angular unconformity. Y.R.B. P.O.U. O.R.B.
  • 8. Disconformitiy  When underlying (older) and overlaying (younger) sedimentary rock strata's are parallel and contact plane is an erosion surface is called Disconformities Y.R.B. P.O.U. O.R.B.
  • 9. Non-conformity  When underlying (older) rock are igneous or metamorphic and the overlaying (younger) rock are sedimentary this types unconformity is called Non-conformity.  Y.R.B.  P.O.U.  P.O.U. O.R.B.
  • 10. Local Unconformity  It is similar to Disconformities but Local in extent and a short period of non-deposition.  The age between the underlying (older) and overlaying (younger) strata are very less this type of unconformity called Local unconformity.
  • 11. Blended unconformity  An unconformity having no distinct surface of separation or sharp contact ,as at an erosion surface that was originally covered by thick residual soil, which graded downward into the underlying rocks and was partly incorporated in the overlaying rocks. Overlaying strata P.O.U. Underlying strata
  • 12. Para conformity  A Para conformity is a type of unconformity in which there is no evidence of a gap in time, because the planes above and below the gap are parallel and there is no evidence of erosion. Y.R.B. P.O.U. O.L.B.
  • 13. Buttress unconformity  A buttress unconformity is when younger is deposited against older strata thus influencing its bedding structure. Y.R.B. P.O.U. O.R.B.
  • 14. Signification of Unconformity  Time interval  Structural discordance Topographic relief  Evidence of weathering at the unconformable surface
  • 15.  Time interval :- 1 – Gap in paleontological record. 2 – Gap in stratigraphic record.
  • 17.  Structural Discordance :- The truncation of sedimentary layers at the stratigraphic contact is an unmistakable evidence of discontinuity.
  • 18.  topographic irregularity :- Disconformities preserve topography corresponding to all stage of the physiographic cycle ranging from undetected surface to near pep plains.
  • 19.  Sharp contrast in the degree of indurations between the underlying and overlying rocks.  Difference in the grade of regional metamorphism of the underlying and overlaying rocks. Presence of basal conglomerate horizon suggest the existence of an unconformity.
  • 20. THANK YOU… Gaining knowledge is not a EVENT … It is a PROCEDURE of HARDWORKING till a long PERIOD………