Geo Tectonic
Inversion Relief
World Geography
ভূগোল সম্পর্কিত যে কোনো লেখা আমাদের পেজের মাধ্যমে সবার কাছে পৌছেদিতে আপনারা ও এগিয়ে আসুন
Inversion Relief
Tuesday, August 15, 2017
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| Inversion Relief |
Inversion Relief gives a detail idea about the topographic evolution,
geological stability, erosional agents, erosional intensity etc. at all. It
also sometimes creates illusion to the geomorphological and geological because
of their inversion topography and structural characteristics.
In Himalaya large numbers of inversion Relief are found.
➽Why call Inversion?
1. As anticline turn into syncline, syncline turn into anticline.
2. Stratigraphically the younger bed is found in lower portion and the
older one is in upper portion.
3. Structurally, valley geology is found at the base of anticline and
anticline based structure is found at the root of syncline.
Rift valley or graben become Block Mountain or horst in case of fault
structure.
➽Causes of Inversion:
1. 1. Formation
of transvers Consequent River alongside anticlinal ridge or horst as well as
formation of some sub-consequent rivers and strong head ward erosion mainly responsible
for valley bed deposition.
2. 2. The
mountain top, especially in folded zone, is more erosive because the upward
bent is severely tensile. So, large number of micro cracks alongside fold axis
are present. That is why it is more fragile. On the other hand due to
compressional force the lower bent become very much crystallize and resist
erosion.
3. 3. The
factor of safety is very less at the mountain top whereas it is very high at
the valley bottom. At the valley top tangential force of gravity (gt) is more
active than actual perpendicular gravity (gp) or basal gravity. At the valley
gp less than or equal to g means less erosion. At the mountain gt>gp or
g=more erosion.
As a result deep rock strata can be seen from surface.
It is called “tectonic window”.
Simply it means when anticline turns into syncline or
syncline valley converted into anticline ridge mainly due to erosional and depositional
activity, is known as inversion of relief. In other word if horst or Block
Mountain transfer into graben and vice-versa is called relief inversion.
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ভূগোল সম্পর্কিত যে কোনো লেখা আমাদের পেজের মাধ্যমে সবার কাছে পৌছেদিতে আপনারা ও এগিয়ে আসুন
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