Continental collision, orogenesis and arc magmatism of the Miocene Maramuni arc, Papua New Guinea

Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea

We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with 3He/4He values (7.4 to 7.9 Ra) slightly lower than typical MORB values, except...

Hankow Reef, Bismarck Volcanic Arc, Papua New Guinea: Source of Yomba Island myth?

Hankow Reef off the coast of Madang Province, New Guinea has been linked to a large eruption at a former island known as ‘Yomba’ by legends told by people living in the Madang province. However some doubts have been made about the accuracy of their comments. I present evidence for a low-lying volcanic island that may have existed at Hankow Reef and its links to the Yomba stories.

Subduction erosion: Rates, mechanisms, and its role in arc magmatism and the evolution of the continental crust and mantle

He-isotopic Investigation of Geothermal Gases from the Tabar- Lihir-tanga-feni Arc and Rabaul, Papua New Guinea

In order to investigate the behavior of slab-derived volatiles in the subduction environment, helium isotope ratios have been measured in geothermal gases from the Tabar-Lihir-TangaFeni (fL TF) chain in the Bismarck Archipelago of Papua New Guinea. As recorded by several geochemical tracers, these volcanos carry an exceptionally large slab-derived component, and therefore may provide new insigh...

The Geology of the Darien, Panama, and the late Miocene-Pliocene collision of the Panama arc with northwestern South America

The geology of the Darien province of eastern Panama is presented through a new geologic map and detailed biostratigraphic and paleobathymetric analysis of its Upper Cretaceous to upper Miocene sediments. The sequence of events inferred from the stratigraphie record includes the collision of the Panama arc (the southwestern margin of the Caribbean plate) and South American continent. Three tect...