Considerable geochemical evidence supports initiation of plate tectonics on Earth shortly after the end of the Hadean. Nb/Th and Th/U of mafic-ultramafic rocks from the depleted …
The lower plate is the dominant agent in modern convergent margins characterized by active subduction, as negatively buoyant oceanic lithosphere sinks into the asthenosphere …
JW Valley, PD Kinny, DJ Schulze… - Contributions to mineralogy …, 1998 - Springer
The oxygen isotope ratios of Phanerozoic zircons from kimberlite pipes in the Kaapvaal Craton of southern Africa and the Siberian Platform vary from 4.7 to 5.9‰ VSMOW. High …
JH Bédard - Geochimica et cosmochimica acta, 2006 - Elsevier
There is no consensus on the processes responsible for near-coeval formation of Archaean continental crust (dominantly tonalite–trondhjemite–granodiorite: TTG), greenstone belts …
CH Miller, R Schuster, U Klötzli, W Frank… - Journal of …, 1999 - academic.oup.com
Major and trace element, Sr–Nd–Pb–O isotope and mineral chemical data are presented for post-collisional ultrapotassic, silicic potassic and high-K calc-alkaline volcanic rocks from …
Occurrence and ClassificationFragments of the Earth's mantle are frequently transported to the surface via volcanic rocks that are dominantly alkaline in nature. These fragments range …
M Pertermann, MM Hirschmann - Journal of Petrology, 2003 - academic.oup.com
We present melt and mineral compositions from nominally anhydrous partial melting experiments at 2–3 GPa on a quartz eclogite composition (G2) similar to average oceanic …
JD Kramers, IN Tolstikhin - Chemical geology, 1997 - Elsevier
A combined solution for the two major terrestrial lead paradoxes has been sought. These are the 'future'paradox (upper crustal and upper mantle Pb isotope compositions plot in the …
MARINE species of Thioploca occur over 3,000 km along the continental shelf off Southern Peru and North and Central Chile1–4. These filamentous bacteria live in bundles …