Role of plagioclase crystal chains in the differentiation of partly crystallized basaltic magma

Article Abstract:

Melting experiments have been undertaken on samples os basaltic rock from a thick lava flow. Feldpsar crystals are revealed to have linked together to form a continuous three-dimensional network of chains when the lava originally started to crystallize. Compositional variations in igneous rocks are mostly the result of separation of liquid from crystals, and the process has affected according to whether crystals are separate or formed in networks.

Lava

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Generation of sodium-rich magmas from newly underplated basaltic crust

Article Abstract:

Plutonic and volcanic rocks from the Cordillera Blanca complex in Peru are described. These rocks resemble the high-aluminum trondhjemite-tonalite-dacite suite, but were produced above a subduction zone zone containing a 60-Myr-old slab. It is suggested that the complex was formed by partial melting of newly underplated basaltic crust. Furthermore, this mechanism is proposed as a general process for generating sodium-rich arc magmas.

Peru, Magma, Rocks, Igneous, Igneous rocks

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The formation of plagioclase chains during convective transfer in basaltic magma

Article Abstract:

Research is presented concerning the three-dimensional chain formation of feldspar crystals in the basaltic rock layer of the Holyoke lava flow in Massachusetts and Connecticut. The stage of crystallization at which the network formed is discussed.

Connecticut, Letter to the Editor, Volcanism, Holyoke, Massachusetts

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