The widespread Triassic volcanic rocks of Greece, dismembered during the Hellenide orogeny, are used to interpret nature rifting. Four assemblages distinguished on geochemical criteria: (1) a predominant subalkaline basalt–andesite–dacite series with high proportion pyroclastic rocks; (2) minor shoshonites; (3) alkali basalt and (4) MORB. stratigraphic palaeogeographic distribution these rock types is synthesized. New Pb Nd isotopic data discriminate between hypotheses suggesting that either...

Structural analysis along 24 cross sections crosscutting several windows in the central Hellenides provides sense of nappe movements as well location destroyed oceans lying between Apulian and Eurasian continents from Mesozoic. Orogeny took place two phases: The first phase, “the Eo‐Hellenic” was initiated by convergence Pelagonian plates with west directed subduction closure Pindos Ocean. Late Jurassic obduction oceanic lithosphere over western margin plate followed footwall imbrication,...

The relationship between diagenetic chlorite rims and depositional facies in deltaic strata of the Lower Cretaceous Missisauga Formation was investigated using a combination electron microprobe, bulk geochemistry X-ray diffraction data. succession studied comprises several stacked parasequences. delta progradational association includes: (i) fluvial or distributary channel sandstones (some with tidal influence); (ii) thick-bedded delta-front graded beds sandstone interpreted as resulting...

The Baijiantan and Darbut ophiolites in West Junggar are exposed steep fault zones (>70°) containing serpentinite mélange, contact on either side with regionally distributed Upper Devonian-Lower Carboniferous ocean floor peperitic basalts overlying sedimentary successions. ophiolitic mélanges show classic structural features created by strike-slip faulting consistent shear sense indicators of left-slip kinematics. Sandstone blocks within the resemble surrounding sediments lithology age,...

Research Article| January 01, 2009 Postorogenic shoshonitic rocks and their origin by melting underplated basalts: The Miocene of Limnos, Greece Georgia Pe-Piper; Pe-Piper * 1Department Geology, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada †E-mail: gpiper@smu.ca. Search for other works this author on: GSW Google Scholar David J.W. Piper; Piper 2Geological Survey (Atlantic), Bedford Institute Oceanography, P.O. Box 1006, Dartmouth, B2Y 4A2, Ioannis Koukouvelas; Koukouvelas...

Abstract The Miocene igneous rocks in the Basal Unit of Lavrion area form part granitoid province central Aegean. Undeformed, subvertical dykes quartz-syenite to granodiorite and granite porphyries, a little deformed but variably altered stock intrude metamorphic Unit. A 9.4 ± 0.3 Ma K–Ar age on feldspar for dyke rock provides minimum activity East–west orientation porphyry is indicative regional extensional stress field with roughly north–south direction. Substantial extension after...

Research Article| May 01, 2013 Early Carboniferous collision of the Kalamaili orogenic belt, North Xinjiang, and its implications: Evidence from molasse deposits Yuanyuan Zhang; Zhang 1Key Laboratory Orogenic Belts Crustal Evolution, Ministry Education, School Earth Space Sciences, Peking University, Beijing 100871, China Search for other works by this author on: GSW Google Scholar Georgia Pe-Piper; Pe-Piper 2Department Geology, Saint Mary's Halifax, Nova Scotia, B3H 3C3, Canada David J.W....

Abstract Interpretation of bulk‐sediment geochemistry is one several approaches for determining sediment provenance. This study investigates the value added by geochemical analysis in interpreting provenance a passive margin clastic basin, Upper Jurassic–Lower Cretaceous deltaic sediments Scotian Basin. Provenance studies this basin are challenging because source tectonic terranes parallel to and polycyclic sources abundant. More than 400 samples mudstone sandstone representing geographical...

Research Article| March 01, 2016 Systematic mineralogical diversity in A-type granitic intrusions: Control of magmatic source and geological processes Angeliki Papoutsa; Papoutsa † 1Department Earth Sciences, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada †angeliki_papoutsa@hotmail.com Search for other works by this author on: GSW Google Scholar Georgia Pe-Piper; Pe-Piper 2Department Geology, Saint Mary’s 3C3, David J.W. Piper 3Natural Resources Canada, Geological Survey...

Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in Aegean area. isotopes are used to further interpret previously published Pb Sr isotope data. The overall pattern volcanism resulted from rapid extension, with thermal effects causing melting hydrated, enriched, subcontinental lithosphere produce widespread K-rich magmas. Slab break-off intrusion hot asthenosphere caused...

Fifteen U–Pb (zircon) radiometric age determinations have been made on igneous rocks of Middle Devonian to Early Carboniferous from the southern margin Magdalen basin in Cape Breton Island and northern mainland Nova Scotia. Volcanic interbed with early rift-basin sedimentary some palynological biostratigraphy; dated intrusive cut these units. Our biostratigraphically constrained ages are close agreement current time scale. Combined previously published data, show that activity occurred four...