Ore mineralization at divergent plate boundary

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Ore mineralization at divergent plate boundary

  1. 3. <ul><li>Basic concept of plate tectonics – </li></ul><ul><li>Earth’s surface is composed of a few large, thick plates that move slowly and change in size. </li></ul>
  2. 4. <ul><li>What Drives Plate Movement ? </li></ul><ul><li>Convection </li></ul><ul><li>Ridge push </li></ul><ul><li>Slab pull </li></ul><ul><li>And/Or </li></ul><ul><li>combination </li></ul><ul><li>of these </li></ul>
  3. 5. <ul><li>Three types of relative motions between plates: </li></ul><ul><li>Divergent plate boundary </li></ul><ul><li>Convergent plate boundary </li></ul><ul><li>Transform plate boundary </li></ul>
  4. 6. <ul><li>Ore = A mineral or aggregate of </li></ul><ul><li>minerals which can be mined </li></ul><ul><li>(extracted and processed) at a profit </li></ul><ul><li>Hydrothermal fluids </li></ul><ul><li>Divergent plate boundaries </li></ul>
  5. 7. <ul><li>Divergent Plate Boundary? </li></ul><ul><li>Divergent plate boundaries are where sea floor-spreading occurs, producing new oceanic crust. </li></ul><ul><li>Fractures are </li></ul><ul><li>formed. </li></ul><ul><li>Along the fractures </li></ul><ul><li>of crust Seawater can </li></ul><ul><li>penetrate to the </li></ul><ul><li>underlying mantle. </li></ul>
  6. 8. <ul><li>Seawater penetrates downward to a depth of several kilometers through fractured crust. </li></ul><ul><li>Heated water </li></ul><ul><li>dissolves elements </li></ul><ul><li>from crust. </li></ul><ul><li>Magma chamber </li></ul><ul><li>contributes </li></ul><ul><li>additional elements </li></ul>
  7. 9. <ul><li>Heat from an underlying magma chamber causes the water to expand and to rise convectively. </li></ul><ul><li>Under reducing </li></ul><ul><li>condition </li></ul><ul><li>upwelling hot metal- </li></ul><ul><li>rich solutions </li></ul><ul><li>precipitate metals as </li></ul><ul><li>sulfides in the crust. </li></ul>
  8. 10. <ul><li>Under oxidizing conditions metals combine with oxygen , hydroxide , silica sulfate or carbonate to deposit metallic oxides, hydroxides, </li></ul><ul><li>silicates, sulfates or </li></ul><ul><li>carbonates on the sea- </li></ul><ul><li>floor. </li></ul><ul><li>Sulfides deposited on </li></ul><ul><li>sea-floor ,preserved </li></ul><ul><li>by impermeable cover </li></ul><ul><li>of sediment or lava. </li></ul>
  9. 11. <ul><li>Conclusion :- </li></ul><ul><li>Ore formation at divergent plate boundary is never ending processes. Divergent plate boundary is a good source of ores. Our job is to find out them for human utility. So,we should prepare ourselves. </li></ul>

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