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• W2009035535 startingPage "4087" @default.
• W2009035535 abstract "Dredge samples selected for study from the Vema Romanche, and Chain fracture zones include serpentinized spinel lherzolites, ilmenite norites, oceanic tholeiites, and a teschenite. The serpentinized ultramafic rocks from the fracture zones are chemically and mineralogically similar to spinel lherzolites (or harzburgites) found as ultramafic tectonites or cumulates. The primary mineral assemblage is olivine (Fo89.3–91.6) orthopyroxene (En87.0–88.8) clinopyroxene (Wo38.4–49.0 En46.4–55.5 Fs4.0–6.1), and a spinel rich in Cr and Al. These rocks apparently represent depleted upper mantle exposed at the base of the fracture zones or diapirically intruded along the fracture zones, or, alternatively, ultramafic cumulates such as in ophiolite complexes. The TiO2-rich norites (TiO2 4.00–5.88 wt %) are iron-rich (FeO + 0.9 Fe2O3 17.3–18.2 wt %) and compositionally resemble the late-stage Skaergaard rocks. Major minerals are plagioclase (An37–68), orthopyroxene (En58–70), clinopyroxene (Wo40–44 En15–17Fs41–43), low-Mg ilmenite, and low-Ti magnetite. Low K2O oceanic tholeiites from the central rift valley on the ridge are typical midocean ridge basalts. Megacrysts of plagioclase that include olivine grains are believed to be of cognate origin. The teschenite, which closely resembles the Black Jack sill teschenite, contains high-Ca titaniferous augite (Wo46–48En23–31Fs15–31), plagioclase (An10–75), ilmenite, titaniferous magnetite, analcite, and zeolites. The diversity of rock types and the occurrence of alkalic basalt imply complex plutonic processes occurring within the fracture zones." @default.
• W2009035535 created "2016-06-24" @default.
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• W2009035535 date "1976-08-10" @default.
• W2009035535 modified "2023-09-24" @default.
• W2009035535 title "Ultramafic and mafic dredge samples from the equatorial Mid-Atlantic ridge and fracture zones" @default.
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• W2009035535 doi "https://doi.org/10.1029/jb081i023p04087" @default.
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