Theories of Iron in laterite

1. Gokhale Education Society’s
h.p.t arts & r.y.k Science college.
Nashik - 5
DEPARTMENT OF GEOGRAPHY
Home Assignment

2. Subject : Gg-310
Tropical Geomorphology
Theories of Origin of Iron in Laterite
&
Landform Development of Laterite

3. Theories of origin of Iron in Laterite
• According to majorities opinion the Laterites soil is formed under conditions
of high temparature and heavy rainfall with alternates wet and dry periodes.
Laterites may be ‘end products of weathering given sufficiently long time
• If aluminous laterite are excluded from consideration it’s common to find
that lateritic horizons contain from 30% to as much as 80% iron oxides.
• Unaltered granite will contained in the region of 2% of iron oxide where as
more basic rock, such as Dolerite. May contain as much as 11% of combine
iron.

4. Trendall (1962)
• Supply enough iron for 9 m. of laterite some 180 m. of rock would have to
be weathered if all the iron where come from in situ alteration.

5. Lelong (1966)
• Iron precipitation within 2 m. of the surface could arise in this way. The
hypothesis remains unproved, but is far reaching in it’s implication. This
situation only arises, however, if it is thought necessary to derived the major
part of the iron in the laterite from the site of formation.

6. Other Writer
• Most have suggested that iron is derived from other sources, beyond the site
of formation, and that iron-bearing solutions move laterally across the
landscape. As the iron becomes immobilised in favourable sites, so
considerable thickness of laterite accumulation.

7. Landform development on laterites
• Tablelands associated on flat laterites which
may vary form mesas to extensive platuex.
• Along the edges of tableland cliffs or
breakaway's are formed.
• On intermediate slopes of valley’s terrace like
featured.
• Circular or elliptical hollows

8. Thank You friends…