Abstract Rapakivi-type quartz monzonite and the underlying dark-grey granodiorite from Pietkowo IG1 borehole, in Polish part of southernmost Fennoscandia have been investigated using whole-rock geochemistry, Sm–Nd isotope geochemistry U–Pb zircon dating. The was emplaced at 1495–1491 Ma, although slightly older cores (antecrysts) 1513 Ma imply a two-stage crystallization. geochemical similariti...

Midyan granites are located in the northern Arabian shield, northwest Saudi Arabia, terrain. They represent most northerly segment of Arabian–Nubian which comprises part East African orogeny. Consequently, understanding origin post-collisional and anorogenic magmatism terrain has significant geodynamic implications. mainly composed alkali feldspar granite, syenogranite, rarely granodiorite dior...

The Lyagkomina occurrence of kyanite amphibolites (the Belomorian Province the Fennoscandian Shield) is confined to an amphibolite boudin among kyanite-garnet-biotite and garnet-biotite gneisses Chupa Sequence. main rock types at are meso- melanocratic garnet-kyanite with large (more than 1 cm in length) kyanite-garnet small kyanite. There also leucocratic garnet-biotite-amphibole-plagioclase r...

The Proterozoic eon is characterized by an unusual abundance of ferroan feldspathic rocks that range in composition from granite to quartz syenites to feldspathoid-bearing syenites. Three associations of ferroan rocks may be recognized on the basis of major element compositions: (1) metaluminous alkalic to alkali-calcic syenites and granites associated with anorthosites and iron-rich basaltic r...

Geochemical, isotopic and age constraints support a comagmatic origin for Ghuweir Mafics and the Feinan A-type granites. The two rocks types, named collectively in this paper as the Feinan Ghuweir Magmatic Suite (FGMS), formed between 556 and 572Ma ago according to Rb–Sr whole-rock dating. FGMS has low Sr initial ratios, which preclude a significant contribution of much older crust in the magma...

TheEmeishan large igneous province contains a diverse assemblage of igneous rocks includingmildly peralkaline granitic rocks ofA-type affinity. The granitic rocks from the Panzhihua, Baima andTaihe plutons are temporally, spatially and chemically associatedwith layeredmafic-ultramafic intrusions. Electronmicroprobe analyses of themajor and accessoryminerals along with major and trace element da...

Triassic eclogite and blueschist facies rocks occur as a thrust sheet, 25-km long and over 2-km thick, in an Eocene fold-andthrust belt in northwest Turkey along the İzmir–Ankara suture. The thrust sheet consists mainly of metabasites with minor marble, phyllite and metachert, and rare lenses of serpentinite. The common blueschist facies mineral assemblage in the metabasites is sodic amphibole ...

The San Miguel de Allende graben, Guanajuato, Mexico, contains numerous rhyolitic volcanic ash beds. Electron microprobe and x-ray fluorescence analyses of glass shards from 14 localities, combined with mineralogic, stratigraphic, radiometric, and paleomagnetic data, allow us to correlate the ash beds (and the intervening sedimentary strata and fossils), understand the timing of volcanism, date...

Parrotfishes (family Labridae: Scarini) are regarded to have important roles for maintaining the ecosystem balance in coral reefs due to their removal of organic matter and calcic substrates by grazing. The purpose of the present study was to clarify the interspecific differences in grazing ability of five parrotfish species (Chlorurus sordidus, C. bowersi, Scarus rivulatus, S. niger and S. for...