La faculte des sciences, sur le preavis de Messieurs M. VUAGNAT, professeur ordinaire (Departement de mineralogie) et W. WILDI, profes-seur ordinaire (Departement de geologie et paleontologie) codireeteurs de these, R. CHESSEX, professeur ordinaire (Departement de mineralo-gie), J. HUNZIKER, Professeur (Universite de Lausanne), C. KERKHOVE, professeur (Universite de Grenoble) et J. MARTINI, doc...

Abstract The subduction of the paleo–Pacific plate beneath North China block has been well documented in terms magmatic activity, geophysical investigations, and numerical modeling, but timing its onset along eastern Asian margin tectonic processes involved remain poorly understood. We have now reconstructed structural evolution sedimentation Shihuiyao–Gangzidian–Yuantai region southern Liaodon...

Abstract. The Phanerozoic tectonothermal evolution of the SW slope East European Platform (EEP) in Poland is reconstructed by means thermal maturity, low-temperature thermochronometry, and modelling. We provide a set new thermochronometric data integrate stratigraphic maturity information to constrain burial history sediments. Apatite fission track (AFT) analysis zircon (U-Th)/He (ZHe) thermoch...

The geology of the Darien province of eastern Panama is presented through a new geologic map and detailed biostratigraphic and paleobathymetric analysis of its Upper Cretaceous to upper Miocene sediments. The sequence of events inferred from the stratigraphie record includes the collision of the Panama arc (the southwestern margin of the Caribbean plate) and South American continent. Three tect...

The ~1.08 Ga anorogenic, A-type Pikes Peak batholith (Front Range, central Colorado) is dominated by coarsegrained, biotite±amphibole syenogranites and minor monzogranites, collectively referred to as Pikes Peak granite (PPG). The batholith is also host to numerous small, late-stage plutons that have been subdivided into two groups (e.g. Wobus, 1976. Studies in Colorado Field Geology, Colorado ...

Neodymium model ages for fine-grained formations of the Paleoproterozoic Huronian Supergroup (McKim, Pecors, Gowganda, Gordon Lake) range from 3.00 to 2.55 Ga and indicate a provenance dominated by the Late Archean Superior Province to the north and west. The stratigraphically highest unit (Gordon Lake Formation) has a distinctive Nd-isotopic composition, with TDM being 100-400 Ma younger than ...

The Volcanic-related Be-U-Mo Baiyanghe deposit is located in the Paleozoic Xuemisitan Volcanic Belt West Junggar (NW China). It largest Be Asia which dominantly hosted late Devonian rhyolitic tuff and Carboniferous Yangzhuang granite (313 ± 2 Ma) that were emplaced after closure of oceanic domain. a strongly fractionated peralkaline A1-type volcanic rock with major magmatic enrichment Nb, Y, Th...