Question

Write a short note on the iron ore deposits of West Bengal...

Answer 1

Explanation:

West Bengal: Burdwan, Birbhum, Darjeeling.

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Answer 2

Answer:

Iron ore deposits of India Seminar on

2. o Introduction o Mineralogy o Types of iron ore formation and deposits o Distribution and occurrence o Conclusion o Reference

3. Introduction o Iron is the most indispensable mineral to man o It is the second largest element in the earth’s crust o Iron is the most abundant metallic element in the earth’s crust and accounts for 5-6% of the lithosphere o Usually it is combined with other elements such as oxygen and sulphur o Iron and steel contribute one of the foundations for modern industrial civilization

4. Mineralogy

5. MAGNETITE: HEMATITE:

6. Types of iron formations Gross in 1965 identified two types of iron formations from the pre-cambrian, they are: o Algoma type :  Dominant in Archean age and characterized by thin banding and absence of oolitic and granular texture  Closely associated with volcanic and greywacke sediments o Superior type :  Characteristic formation of Proterozoic age  Closely associated with clastic sediments like quartzite, dolomite and pelitic rocks without showing an direct relation with volcanic association

7. Origin and classification of Iron ore deposits: The iron ore deposits of India can be broadly divided in to the following six groups on the basis of mode of occurrence and origin: o Banded Iron Formation of Pre-Cambrian Age o Sedimentary iron ore deposits of siderite and limonitic composition o Laterite ores derived from the sub-aerial alterations o Ores formed by magmatic activity o Titaniferous and vanadiferous magnetites o Fault and fissure filling deposits

8. 1. Banded Iron Formation of Pre-Cambrian Age:  The BIF deposits is very well developed in India. The most common names used are Banded Haematite Quartzite (BHQ) and Banded Magnetite Quartzite (BMQ). This belong to Dharwar group of meta-volcanics and metasediments. These banded formations were probably formed as chemical precipitates in partially enclosed sedimentary basins of back water type.

9. 2. Sedimentary iron ore deposits of siderite and limonitic composition: It is also known as Bog iron deposit. These ores of siderite and limonitic compositions are found associated with the iron stone shales of lower Gondwana age The iron minerals are accumulated as irregular bodies in stream beds and typically at the bottom levels of bogs and marshes where lower Gondwana sediments have deposited along with their organic debris.

10. 3. Laterite ores derived from the sub-aerial alterations: Laterite types of iron ores are derived from the sub-aerial alteration of rocks, such as gneisses, schists, basic lava under humid tropical conditions. The ores are generally concentrated at the top as a resultant alteration product of the iron bearing parent rocks and consist of oxidised and insoluble rock constituents.