Fractional crystallization of hydrous basaltic “arc-type” magmas and the formation of amphibole-bearing gabbroic cumulates

  title={Fractional crystallization of hydrous basaltic “arc-type” magmas and the formation of amphibole-bearing gabbroic cumulates},
  author={Dick T. Claeson and William P. Meurer},
  journal={Contributions to Mineralogy and Petrology},
The Rymmen and Eriksberg gabbros preserve the crystallization products of hydrous basaltic liquids, ranging from anorthosite and troctolite to highly fractionated oxide gabbro, diorite, and leucotonalite. The high initial water content of the liquids that filled the magma chambers (1.5–3 wt%) allowed amphibole to saturate as an interstitial mineral even in the earliest formed cumulates. The increasing water content of the system helped to produce a thick sequence of cumulates with anorthitic… 

Water-saturated magmas in the Panama Canal region: a precursor to adakite-like magma generation?

Amphibole, while uncommon as a phenocryst in arc lavas, is increasingly recognized as a key constituent in the petrogenesis of arc magmas. Fractional crystallization of water-saturated arc magmas in

Postcumulus processes in oceanic-type olivine-rich cumulates: the role of trapped melt crystallization versus melt/rock interaction

Combined microstructural and geochemical investigations on MORB-type primitive olivine-rich cumulates intruded in the Erro–Tobbio (ET) mantle peridotites (Voltri Massif, Ligurian Alps, Italy)

Differentiation of a Hydrous Arc Magma Recorded in Melt Inclusions in Deep Crustal Cumulate Xenoliths from Ichinomegata Maar, NE Japan

The Ichinomegata maar, located in the back‐arc side of the northeastern Japan arc, erupted calc‐alkaline andesitic magma with abundant deep‐crustal and mantle xenoliths at about 60–80 ka. We

The early Paleozoic cumulate gabbroic rocks from the southwest part of the Tisza Mega-Unit (Mt. Papuk, NE Croatia): evidence of a Gondwana suture zone

The Mt. Papuk heteroadcumulate pyroxene–amphibole gabbronorites, which outcrops at the southern margin of the Tisza Mega-Unit, is suggested to stem from the deep oceanic crust formed by the in situ

The role of amphibole in the evolution of arc magmas and crust: the case from the Jurassic Bonanza arc section, Vancouver Island, Canada

The Jurassic Bonanza arc, on Vancouver Island, British Columbia, represents an exhumed island arc crustal section of broadly diorite composition. We studied bodies of mafic and ultramafic cumulates

Petrogenesis of gabbro and orthopyroxene gabbro from the Phenai Mata Igneous Complex, Deccan volcanic province: Products of concurrent assimilation and fractional crystallization

We report the occurrence of orthopyroxene gabbro from the Phenai Mata Igneous Complex (containing thoeliitic and alkaline rocks) that occur within Deccan Traps. The P-T calculations based on two



The role of H2O during crystallization of primitive arc magmas under uppermost mantle conditions and genesis of igneous pyroxenites: an experimental study

Abstract. Exposed, subduction-related magmatic arcs commonly include sections of ultramafic plutonic rocks that are composed of dunite, wehrlite, and pyroxenite. In this experimental study we

Stability of REE-bearing minerals in a metaluminous leucotonalite from the Eriksberg gabbro, Transscandinavian Igneous Belt, Sweden

This paper describes the accessory mineral assemblage of apatite, monazite, allanite, xenotime, zircon, and an unidentified Th-silicate in a metaluminous leucotonalite from the Eriksberg gabbro, SW

Parental magmas of the Nain Plutonic Suite anorthosites and mafic cumulates: a trace element modelling approach

Abstract.Equilibrium melt trace element contents are calculated from Proterozoic Nain Plutonic Suite (NPS) mafic and anorthositic cumulates, and from plagioclase and orthopyroxene megacrysts. Assumed

Boundary Layer Crystallization in a Basaltic Magma Chamber: Evidence from Rishiri Volcano, Northern Japan

The evolution of basaltic magma by mushy boundary layer processes INTRODUCTION in a magma chamber is documented for an alkali basalt (Kutsugata The evolution of magma chambers is of major petrologic

The role of an H2O-rich fluid component in the generation of primitive basaltic andesites and andesites from the Mt. Shasta region, N California

Abstract. This paper presents analyses of the trace element abundances and isotopic compositions in primitive lavas from the Mt. Shasta region, N California. These data are combined with estimates of

Late Holocene hydrous mafic magmatism at the Paint Pot Crater and Callahan flows, Medicine Lake Volcano, N. California and the influence of H2O in the generation of silicic magmas

Abstract This paper characterizes late Holocene basalts and basaltic andesites at Medicine Lake volcano that contain high pre-eruptive H2O contents inherited from a subduction related hydrous

Some Phase Equilibrium Constraints on the Origin of Proterozoic (Massif) Anorthosites and Related Rocks

Experimental data in the range of 1 bar to 13 kbar enable us to INTRODUCTION map the liquidus equilibria relevant to Proterozoic (massif) anorThere is hardly a consensus on the petrogenesis of

Temporal variation of mineralogy and petrology in cognate gabbroic enclaves at Arenal volcano, Costa Rica

Gabbroic enclaves ejected during the current eruption phase (A-1) and during the latest prehistoric eruption phase (A-2) of Arenal Volcano show systematic variations in texture, mineralogy and