Briefly explain the roles of magma and hydrothermal activity in ...

[olgavictoria]

Briefly explain the roles of magma and hydrothermal activity in forming ore deposits along convergent
  and divergent plate boundaries What will be an ideal response?

Question 2

Briefly explain why there is so much oil in the Persian Gulf region. What will be an ideal response?

[asware1]

Answer to Question 1

Magma contains valuable elements, some of which leave the magma in gases and fluids. These
substances transport the elements and facilitate their exchange for other elements in the surrounding
rock. The surrounding rock may then have enough of the valuable elements to become an ore deposit.
At convergent plate boundaries, partial melting at the subducting plate allows magma and valuable
minerals to rise up in fluids and erupt at volcanoes or cool beneath the surface as plutons. At divergent
plate boundaries, hydrothermal vents form. In these locations, seawater filters past hot magma, picks
up valuable elements, and then the hot fluids flow onto the seafloor and drop their valuable elements

Answer to Question 2

During the Mesozoic, the Persian Gulf was a broad, stable marine shelf. Countless microorganisms
lived in the surface water and their remains accumulated in the bottom sediments and were buried. The
collision between Arabia and Iran has tilted the Arabian plate and crumpled rocks on the edges of both
plates. The tilting of Arabia allows oil to migrate upslope to accumulate in traps created by folding.