What terms describe mid ocean ridge basalt?
What terms describe mid ocean ridge basalt? …they are referred to as mid-ocean-ridge basalt (MORB). They are subalkaline tholeiites that contain olivine in the norm and less than 0.25 percent potash. The chemistry suggests that MORB was generated from a mantle that was depleted of volatile elements (e.g., lanthanum [La], cerium [Ce], sodium, and potassium) in a… How do mid ocean ridge basalts form? MORB are generated by massive melting events that mix melts derived from depleted mantle and relatively enriched 'plums' of recycled materials, while the smaller degrees of melting typical of ocean island basalts are capable of extracting...