Ocean rise-like basalts within the Galapagos Archipelago
Ocean rise-like basalts within the Galapagos Archipelago
复制标题
加拉帕戈斯群岛内类似海洋上升的玄武岩
作者：
H. W. BAITIS;F. Swanson
加拉帕戈斯群岛、冰岛以及其他大洋岛屿被解释为地幔柱的地表表现形式[1 - 3]。这种岛屿发育模型的一个关键要素集中在从假定的地幔柱喷出的熔岩组与大洋中脊喷出的熔岩组之间在岩石学和地球化学方面的差异[1 - 3]。但是，在冰岛发现具有大洋中脊成分的玄武岩促使人们对在地幔柱中的岩石学过程模型进行修改[4,5]。我们只知道另外一处有报道称在假定的地幔柱起源的岛屿上喷发出类似大洋中脊的玄武岩：夏威夷岛波洛卢系列的熔岩流[6]。
THE Galapagos Archipelago, Iceland, and other oceanic islands, have been interpreted as surface manifestations of mantle plumes1–3. A key element of this model of island development centres on the petrological and geochemical contrasts between suites of lavas erupted from the proposed mantle plumes and at oceanic rises1–3. But the recognition of basalts of ocean rise composition on Iceland has prompted modification of models of petrological processes in mantle plumes4,5. We know of only one other reported occurrence of ocean rise-like basalts erupted on islands of proposed plume origin: flows in the Pololu Series on the Island of Hawaii6.