Poly­metal­lic sul­phides:

Down to Earth - - COVER STORY -

The de­posit, also known as seafloor mas­sive sul­phides, forms when min­eral-rich magma of 400 C erupts from hy­dro­ther­mal vents on to the seabed. It was dis­cov­ered in 1977 and is known to con­tain cop­per, lead, zinc, sil­ver and gold, bar­ium and nickel. It is present in all oceans. The vents are es­ti­mated to oc­cur at ev­ery 100 km along the 60,000 km along mid-oceanic ridge en­cir­cling earth. Only 350 vents have been dis­cov­ered so far.

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