#4 Upon which plate are located the Windward Islands that define the boundary of
ID: 299239 • Letter: #
Question
#4 Upon which plate are located the Windward Islands that define the boundary of the Caribbean Sea? Write the name of the plate here. ________________________________________________________________________________ The composition of the magma can change as the result of two important processes: a. Partial melting: Minerals have different phase transition temperatures. The densest minerals melt at higher temperatures and solidify at higher temperatures; the least dense minerals melt at lower temperatures and solidify at lower temperatures (closer to the surface). Minerals that crystallize out may settle to the bottom, changing the mineral composition of the magma. - Partial melting of upward convection mantle material contributes to decompression melting in that the minerals with the lowest melting point (least dense = felsic) are the first to melt and collect to form magma. - Partial melting also contributes to subduction magma formation: the water in the subducting plate first promotes melting in those minerals with the lowest melting temperature. b. Assimilation: At ocean-continent convergent boundaries, mafic magma moving upward through continental rock (felsic) melts some of the surrounding rock along the way, resulting in intermediate igneous rock (mix of mafic and felsic minerals). _____________________________________________________________________________________
Explanation / Answer
The windward islands are located on the Caribbean plate , which defines the boundary of the Caribbean Sea.
The partial melting of the upper mantle rocks is a result of release of large amounts of water from the hydrous minerals present in the subducting plate ,which release water owing to increased pressure and temperature upon subduction.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.