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Crustal growth in West Africa at 2.1 Ga
Birimian (∼2.1 Ga) terranes in the West African craton are a mixture of highly metamorphosed volcanic, sedimentary and plutonic rocks and low grade metavolcanics and metasediments. The volcanic units… Expand
The amount of recycled crust in sources of mantle-derived melts.
Plate tectonic processes introduce basaltic crust (as eclogite) into the peridotitic mantle. The proportions of these two sources in mantle melts are poorly understood. Silica-rich melts formed from… Expand
Role of recycled oceanic basalt and sediment in generating the Hf–Nd mantle array
The isotopic composition of oceanic basalts suggests that they are composed of true recycled oceanic crust and sediments, which are mixed with the depleted mantle.
Temperatures in Ambient Mantle and Plumes: Constraints from Basalts, Picrites, and Komatiites
Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads… Expand
Flood and shield basalts from Ethiopia: Magmas from the African superswell
The Ethiopian plateau is made up of several distinct volcanic centres of different ages and magmatic affinities. In the NE, a thick sequence of 30 Ma flood basalts is overlain by the 30 Ma Simien… Expand
Emergence of a Habitable Planet
Abstract We address the first several hundred million years of Earth’s history. The Moon-forming impact left Earth enveloped in a hot silicate atmosphere that cooled and condensed over ∼1,000 yrs. As… Expand
The heterogeneous Iceland plume: Nd‐Sr‐O isotopes and trace element constraints
- C. Hemond, N. Arndt, U. Lichtenstein, A. Hofmann, N. Óskarsson, S. Steinthorsson
- 10 September 1993
We present a comprehensive set of Sr, Nd, and O isotope data and trace element concentrations from tholeiitic and alkaline lavas of the neovolcanic zones of Iceland (picrites, olivine and quartz… Expand
Oceanic nickel depletion and a methanogen famine before the Great Oxidation Event
It has been suggested that a decrease in atmospheric methane levels triggered the progressive rise of atmospheric oxygen, the so-called Great Oxidation Event, about 2.4 Gyr ago. Oxidative weathering… Expand
Ir, Ru, Pt, and Pd in basalts and komatiites: new constraints for the geochemical behavior of the platinum-group elements in the mantle
Abstract The concentrations of the platinum-group elements (PGE) Ir, Ru, Pt, and Pd were determined in 18 mantle-derived basalts from a variety of tectonic settings and six komatiites from three… Expand
Isotopic and trace-element constraints on mantle and crustal contributions to Siberian continental flood basalts, Noril'sk area, Siberia
Abstract We present a tightly controlled and comprehensive set of analytical data for the 250-Ma Siberian flood-basalt province. Consideration of major- and trace-element compositions, along with… Expand