Island-arc Ankaramites: Primitive Melts from Fluxed Refractory Lherzolitic Mantle
نویسندگان
چکیده
منابع مشابه
Density of primitive lunar melts
Thermo-chemical models of the dynamics of the internal differentiation of the Moon require accurate knowledge of the density of lunar minerals and melts at a range of high pressure, high temperature conditions. Here we present a comparative study of high-pressure, high-temperature density determinations of possible primitive lunar melts, as represented by volcanic glass beads sampled during the...
متن کاملTrace elements in clinopyroxenes from Aleutian xenoliths: Implications for primitive subduction magmatism in an island arc
Trace element abundances in clinopyroxene (cpx) from cumulate xenoliths are used to characterize the nature of primitive magma-forming processes beneath the Aleutian island arc. Clinopyroxenes from deformed mafic and ultramafic xenoliths hosted in a Neogene-age mafic sill from Kanaga Island have widely varying trace element abundances (Sr=8–32, Y=2–64, Zr=2–38, Nd=0.65–16 ppm) that are generall...
متن کاملComparing primitive EETA 79001 melts with those from other SNC
Introduction: The shergottite meteorites have been subdivided into three groups based on texture and mineralogy [1]. EETA79001 is a shergottite that contains examples of all three lithologies: lherzolitic (lithology X), olivine-phyric (lithology A), and basaltic (lithology B). Therefore, studying the magmas involved in the petrogenesis of EETA79001 may provide information not only on its own pe...
متن کاملUltra-calcic Magmas Generated from Ca- depleted Mantle: an Experimental Study on the Origin of Ankaramites
Ultra-calcic ankaramitic magmas or melt inclusions are ubiquitous in arc, ocean-island and mid-ocean ridge settings. They are primitive in character (XMg 4 0 65) and have high CaO contents (414 wt %) and CaO/Al2O3 (41 1). Experiments on an ankaramite from Epi, Vanuatu arc, demonstrate that its liquidus surface has only clinopyroxene at pressures of 15 and 20 kbar, with XCO2 in the volatile comp...
متن کاملSeparation of supercritical slab-fluids to form aqueous fluid and melt components in subduction zone magmatism.
Subduction-zone magmatism is triggered by the addition of H(2)O-rich slab-derived components: aqueous fluid, hydrous partial melts, or supercritical fluids from the subducting slab. Geochemical analyses of island arc basalts suggest two slab-derived signatures of a melt and a fluid. These two liquids unite to a supercritical fluid under pressure and temperature conditions beyond a critical endp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2004
ISSN: 1460-2415
DOI: 10.1093/petrology/egg101