Article history: Basaltic magmatism is a co Received 31 July 2008 Received in revised form 21 November 2008 Accepted 9 December 2008 Available online 30 January 2009

The Ellsworth belt is one of several fault-bounded blocks exposed along the southeastern coast Maine that formed within Ganderia. New ID-TIMS U–Pb geochronological data integrated with field relationships provide additional insights into timing magmatism and deformation in belt. deformed Lamoine Granite was selected for zircon analysis to: (i) establish protolith age; (ii) direct temporal const...

Abstract The Paleocene‐early Eocene continental magmatic arc (PECMA) in the Northern Andes is an example of magmatism following a major collisional event. This formed after arc‐continent collision between Caribbean Plate and South American margin at ca. 72 Ma. We used detrital zircon LA‐ICP‐MS CA‐ID‐TIMS geochronology geochemistry to complement limited plutonic record PECMA better characterize ...

Abstract The magmatic response above subducting ocean lithosphere can range from weak to vigorous and a narrow zone widely distributed. small young Cascade Arc, riding on the margin of tectonically active North American plate, has expressed nearly this entire volcanic activity. This allows an unusually good examination arc initiation early growth. We review tectonic controls Cascade-related mag...

The Goto Islands are located at the westernmost tip of Japan archipelago, and preserve a lower–middle Miocene sedimentary sequence deposited during rifting continental margin opening Sea Japan. stratigraphy Group new K–Ar, fission-track, U–Pb age data were used to determine initial conditions in southwest thickness is 2000–3000 m. lower unit (ca. 22–17.6 Ma) consists thick, greenish, volcanicla...

In this paper it is shown that the Mayr-type arc models can be used to describe the arc behavior before current zero exactly. Based on this analysis the different types of ‘modified’ Mayr arc models can be explained. As a result of the theory, an improved Mayr-type arc model with a constant time parameter and a cooling power which is dependent on the electrical power input is introduced and use...

Abstract Early Paleozoic accretionary orogens dominated the Western Gondwana margin and were characterized by nearly continuous subduction associated with crustal extension back-arc basin development. The southwestern is represented Famatinian Pampean basement realms exposed in South America, both related to protracted evolution of Terra Australis Orogen, whereas northwestern mainly recorded Ca...

Island-arc accretion during the assembly of Gondwana has been widely regarded as main mechanism for Neoproterozoic crustal growth in Arabian-Nubian Shield (ANS). However, processes involved to transform newly accreted juvenile terranes into a typical continental crust remain unclear. Here, we present geochemical, isotopic, and U-Pb geochronological data from El-Shadli volcanic province (80 km ×...