منابع مشابه
The role of serpentine in preferential craton formation in the late Archean by lithosphere underthrusting
Cratons form the cores of continents and were formed within a narrow window of time (2.5–3.2 Gy ago), the majority having remained stable ever since. Petrologic evidence suggests that the thick mantle roots underlying cratons were built by underthrusting of oceanic and arc lithosphere, but paradoxically this requires that the building blocks of cratons are weak even though cratons must have bee...
متن کاملArchean radiative forcings
Introduction Conclusions References Tables Figures Back Close Full Screen / Esc This discussion paper is/has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP if available. Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Previous research has shown that methane may have been sustained...
متن کاملThe Oceanic Lithosphere
1. Background: Mid-Ocean Ridges and the oceanic lithosphere 2. Methods of study of the oceanic lithosphere 3. Components of the oceanic lithosphere and their physical properties 4. Structure of the oceanic lithosphere 4.1 ‘Homogeneous’ lithosphere 4.2 ‘Heterogeneous’ lithosphere 4.3 Hot Spot Influenced Lithosphere 4.4.Continent to Ocean Transition 5. Forming the oceanic lithosphere at the ridge...
متن کاملLithosphere, Asthenosphere, and Perisphere
"Lithosphere" is a mechanical concept implying strength and relative permanence. Unfortunately, the term has also been applied to the surface thermal boundary layer (TBL) and a shallow enriched geochemical reservoir, features having nothing to do with strength. The "strong" lithosphere is about one half the thickness of the TBL. The bottom of the elastic plate, the maximum depths of midplate an...
متن کاملMass-independent fractionation of sulfur isotopes in Archean sediments: strong evidence for an anoxic Archean atmosphere.
Mass-independent fractionation (MIF) of sulfur isotopes has been reported in sediments of Archean and Early Proterozoic Age (> 2.3 Ga) but not in younger rocks. The only fractionation mechanism that is consistent with the data on all four sulfur isotopes involves atmospheric photochemical reactions such as SO2 photolysis. We have used a one-dimensional photochemical model to investigate how the...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 2003
ISSN: 0148-0227
DOI: 10.1029/2001jb000169