Web快速翻译英语和 100 多种语言之间的字词和短语。 WebEruption of middle Eocene-lower Oligocene boninites and island arc tholeiites created the 200 km wide Izu-Bonin arc massif following the initiation of subduction {approximately}50 Ma. Mid-Oligocene rifting formed a 40-70 km wide forearc basin between the Eocene outer-arc high and the Eo-Oligocene arc (now the frontal arc high), with maximum ...
Global map of boninite occurrences from which boninite series …
WebFeb 5, 2024 · At site U1439C, high-Si boninites overlie low-Si boninites and have been interpreted to reflect the temporal transition from an extensional (‘axial’) to off-axis (possibly proto-stratovolcano) emplacement setting (Reagan et al., 2015; Li et al., 2024) as well as the evolution of the mantle wedge during arc infancy (Reagan et al., 2024).As a harzburgitic … WebFeb 26, 2013 · Boninites and boninitic andesites, dacites, and rhyolites. The boninites recovered from the Hahajima Seamount are glassy rocks, similar to those from Chichijima Island described by Umino (1986) and Taylor & Goodliffe (1994). Vesicles are common, with zeolite and opal filling the vesicles. Samples D7-684 and D20-14 are typical olivine … pangeo consultants
Geochemical characteristics of boninite series volcanics: …
WebFeb 5, 2024 · Boninites are generated through fluid-fluxed partial melting of prior melt-depleted mantle sources such as sparsely clinopyroxene-bearing harzburgite (e.g. … http://fanyi.youdao.com/ WebIf boninites originate primarily at a particular depth by flux melting (in situ melting due to fluid addition), these values may represent the true temperatures and pressures of … pangeo region