Coordinated 14C and 230Th dating of Kitchen Cave rockshelter, Gambier (Mangareva) Islands, French Polynesia: Comparing 230Th coral dates with Bayesian model ages

Echinophyllia tarae sp. n. (Cnidaria, Anthozoa, Scleractinia), a new reef coral species from the Gambier Islands, French Polynesia

A new shallow water scleractinian coral species, Echinophyllia tarae sp. n., is described from the Gambier Islands, French Polynesia. It is characterized by an encrusting corallum, a few large and highly variable corallites with protruding walls, and distinctive costosepta. This coral was observed in muddy environments where several colonies showed partial mortality and re-growth. The new speci...

In situ 238U-230Th disequilibrium dating of pyrochlore at sub-millennial precision

We report the application of high-resolution in situ 238U-230Th disequilibrium dating to pyrochlore [(Ca,Na,REE,Th,U)2(Nb,Ti,Ta,Zr)2O6(OH,F)]. Compositionally zoned pyrochlore is an accessory phase in intrusive carbonatitic syenites, which were ejected as cognate clasts during the eruption of the phonolitic Laacher See volcano, East Eifel, Germany, 12.9 ka ago. Separated individual pyrochlore c...

Breeding Seabirds of Gambier Islands, Eastern Polynesia: Numbers and Changes during the 20th Century

Timescales of magmatic processes and eruption ages of the Nyiragongo volcanics from 238U-230Th-226Ra-210Pb disequilibria

a r t i c l e i n f o Keywords: silica-undersaturated volcanism 238 U-230 Th-226 Ra-210 Pb series disequilibria magma transport and residence time carbonate metasomatism volcanic hazard assessment The silica-undersaturated Nyiragongo volcanics, located in the East African Rift, have globally unique chemical compositions and unusually low viscosities, only higher than carbonatite lavas, for terr...

U/Th-dating living and young fossil corals from the central tropical Paci¢c

This study evaluates the accuracy of U/Th dates for young (6 a few thousand years old) reef corals, both living and fossil, and explores strategies for refining those dates. The high precision of the U/Th method (0 1^2%) for dating young corals is well-established. Earlier studies have demonstrated the method’s accuracy for select samples of known age. However, these studies have focused on typ...