Plume-Associated Ultramafic Magmas of Phanerozoic Age
نویسندگان
چکیده
منابع مشابه
Late Palaeozoic Ultramafic Lavas in Yunnan, SW China, and their Geodynamic Significance
marine sequences within several orogenic belts in YunWe report petrological and geochemical data on ultramafic pillow nan, SW China (Figs 1 and 2; Fang et al., 1996). These lavas from Late Palaeozoic marine sequences in Yunnan, SW lavas have been interpreted to be oceanic plateaux or China. These lavas have >26 wt % MgO, euhedral to subhedral seamount eruptive rocks associated with mantle plume...
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A suite of tholeiitic picrites from eight of the younger (<2 Ma) Hawaiian shield volcanoes provides new information about the compositions of primitive magmas and source components in the Hawaiian plume. Olivine and bulk rock compositions show that parental melts at Hawaiian volcanoes have at least 13–17% MgO and 3⁄410% Al2O3. The picrites have bulk compositions ranging from 14 to 30% MgO, and ...
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The mam plant communities of ultramafic (serpentine) outcrops of a Mediterranean area in central Italy are described and their successional pathway discussed. Four vegetation stages are distinguished: a) an endemic garigue stage, with high percentage of exposed rocky soil belonging to Armerio-Alyssetum bertolonii; b) a garigue stage similar to the previous one but with several Mediterranean eve...
متن کاملThermal evolution of the Earth as recorded by komatiites
Komatiites are rare ultramafic lavas that were produced most commonly during the Archean and Early Proterozoic and less frequently in the Phanerozoic. These magmas provide a record of the thermal and chemical characteristics of the upper mantle through time. The most widely cited interpretation is that komatiites were produced in a plume environment and record high mantle temperatures and deep ...
متن کاملImplications of the Temporal Distribution of High‐Mg Magmas for Mantle Plume Volcanism through Time Author(s):
We compile a 3.7-b.yr.-long time series of ultramafic and mafic rocks including extrusives and shallow intrusives (dikes and sills). We infer that peaks in the time series represent mantle plume events. Rocks erupted from plumes are becoming more Ti rich through time, and several rock types having 118 wt % MgO are Phanerozoic analogs for komatiites. These include meimechites, ankaramites, and r...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2002
ISSN: 1460-2415,0022-3530
DOI: 10.1093/petrology/43.10.1857