Geochronology, geochemistry and petrogenesis of rhyodacite lavas in eastern Jamaica: A new adakite subgroup analogous to early Archaean continental crust?

Rhyodacite lavas (Newcastle Volcanic Formation) from the Wagwater Basin in eastern Jamaica dated at 52.74 ± 0.34 Ma (2σ) have adakitic-like major element compositions, low Y and heavy rare Earth element (REE) concentrations and negative Nb and Ta anomalies on a normal mid-ocean ridge basalt normalis...

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Veröffentlicht in:	Chemical geology 2010-09, Vol.276 (3), p.344-359
Hauptverfasser:	Hastie, Alan R., Kerr, Andrew C., McDonald, Iain, Mitchell, Simon F., Pearce, Julian A., Millar, Ian L., Barfod, Dan, Mark, Darren F.
Format:	Artikel
Sprache:	eng
Schlagworte:	40Ar/ 39Ar Adakite Archaean Chromium Crusts Jamaica Lava Magma Magnesium oxide Melting Nickel Oceanic plateau Rocks Strontium Trondhjemite–tonalite–granodiorite/dacite (TTG/D)
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