A Two-stage Thermal Evolution Model of Magmas in Continental Crust
نویسندگان
چکیده
منابع مشابه
A two-reservoir recycling model for mantle-crust evolution.
The exact solutions for the isotopic compositions and the concentrations of the two-reservoir model for mantle-crust evolution are given for arbitrary rates of crustal growth and of back flow to the mantle. The critical parameters are the chemical fractionation factors for crustal growth and refluxing and the integrated fractional mass-removal rates from the crust and the mantle. For the case w...
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T h e problem of the origin of the cont inental crust can be resolved into two fundamenta l quest ions: (1) the lo cation and mechani sms of init ial m a n t l e extract ion of the primitive crust and (2) the processes by which this primitive crust is converted into the cont inental crust that presently exists . W e know that Archean cont inen tal crust is compos i t iona l ly dist inct from ...
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چکیده ندارد.
15 صفحه اولContinental crust beneath southeast Iceland.
The magmatic activity (0-16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental lithospheric mantle derived from the nearby continental margins. A restricted area in southeast Icelan...
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The continental crust is 41.4 km thick on average and covers 39% of the Earth’s surface. Information from the isotopic and trace element composition of >4-billion-yearold (Ga) zircon grains and the evolution of mantle isotopic reservoirs indicates that 75%, and possibly more, of the continental crust was created before 2.5 Ga (Harrison 2009; Belousova et al. 2010). Thus, the continental crust i...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 1999
ISSN: 1460-2415
DOI: 10.1093/petrology/40.2.241