Multiple origins for mantle harzburgites: examples from the Lewis Hills, Bay of Islands ophiolite, Newfoundland

Study in the Bay of Islands ophiolite exposed in the Lewis Hills of Newfoundland has enabled the identification of four major types of harzburgite, which represent examples of a complete spectrum of this rock type. Enrichments and depletions of orthopyroxene by solution-precipitation reactions may result not only in the variety of harzburgite types, which on partial melting might produce a range of melt products, but also in fronts of harzburgite migrating through the mantle. -from Authorspublished_or_final_versio

Epizonal I- and A-type granites and associated ash-flow tuffs, Fogo Island, northeast Newfoundland

Magmatic activity of Silurian-Devonian age is widespread in the Appalachian-Caledonian Orogen. A marked characteristic of this magmatism is the composite nature of the igneous suites, which range from peridotite to granodiorite in single plutonic bodies. Such a suite of intrusive rocks, ranging in composition from minor peridotite to granodiorite, intrudes an openly folded sequence of Silurian volcanogenic sandstones and ash-flow tuffs on Fogo Island, northeast Newfoundland. Two units, the Rogers Cove and Hare Bay microgranites, consist of fine-grained hastingsite granites with spherulitic and flow-banded textures. These rocks have an A-type granitoid affinity. A third and the most voluminous granitic unit, the Shoal Bay granite exhibits mineral parageneses similar to the microgranites, but chemical characteristics more typical of calc-alkaline, I-type granitoids. Volcanic-sedimentary sequences spatially associated with the granitic rocks include dense, welded, high-silica, hastingsite-bearing ash-flow tuffs with compositions that suggest they represent erupted equivalents of fractionated end members of the Shoal Bay granite. -from Authorspublished_or_final_versio

The new aestheticism

The rise of literary theory spawned the rise of anti-aestheticism, so that even for cultural theorists, discussions concerning aesthetics were often carried out in a critical shorthand that failed to engage with the particularity of the work of art, much less the specificities of aesthetic experience. This book introduces the notion of a new aestheticism - 'new' insofar as it identifies a turn taken by a number of important contemporary thinkers towards the idea that focussing on the specifically aesthetic impact of a work of art or literature has the potential to open radically different ways of thinking about identity, politics and culture. The appearance of a new aestheticism at a moment that is often termed 'post-theoretical' is a direct index of the extent to which, as 'theory' now enters a more reflective phase, there is an increased willingness among critics and philosophers to consider the ways in which literary and cultural theory often overlooked key aspects of its reliance on philosophical aesthetics. With its impressive array of contributors, The new aestheticism will be of particular interest to students and scholars of literature, philosophy and cultural studies

Lowermost Ordovician (basal Tremadoc) radiolarians from the Little Port Complex, western Newfoundland

Lowermost Ordovician (basal Tremadoc) cherts from the Little Port Complex, western Newfoundland, contain a distinctive, moderately well-preserved, radiolarian assemblage. The fauna differs from those reported from the Arenig, suggesting that somes of the earliest radiolarian forms may have biostratigraphic potential. The abundance of radiolarians in chert and the ease with which they can be extracted suggest that they are a potentially valuable tool for use in investigation of the timing and development of early Palaeozoic orogenic systems. A previously undescribed radiolarian Beothuka terranova sp. nov., belonging to a new genus Beothuka gen. nov. and of uncertain higher-level affinity is formalized herein.published_or_final_versio

The dynamothermal aureole of the Donqiao ophiolite (northern Tibet)

Metamorphic rocks found at the base of the Jurassic Donqiao ophiolite of northern Tibet are interpreted as a basal dynamothermal aureole produced during obduction of the massif. The rocks form a sequence some 8 m thick, varying from high-grade amphibolites at the contact with overlying harzburgites to greenschist facies metasedimentary rocks lower down. The mineral paragenesis is similar to other such aureoles, and indicates that temperatures in excess of 750°C may have been reached during metamorphism. The lack of high-pressure minerals suggests that the rocks were produced by subcretion in a relatively shallow dipping subduction zone. Ar-Ar geochronology on amphibole separates provides dates of 175-180 Ma for the displacement of the ophiolite, significantly older than the age of emplacement estimated from stratigraphic relationships. The ophiolite was clearly obducted very soon after its formation in a suprasubduction zone environment.published_or_final_versio