New Ar-Ar muscovite and Rb-Sr biotite age data in combination with structural analyses from the Apuseni Mountains provide new constraints on the timing and kinematics of deformation during the Cretaceous. Time-temperature paths from the structurally highest basement nappe of the Apuseni Mountains in combination with sedimentary data indicate exhumation and a position close to the surface after ...

We describe the structure, microstructures, texture and paleopiezometry of quartz-rich phyllites and marbles along N-trending Moutsounas shear zone at the eastern margin of the Naxos metamorphic core complex (MCC). Fabrics consistently indicate a top-to-the-NNE non-coaxial shear and formed during the main stage of updoming and exhumation between ca. 14 and 11 Ma of the Naxos MCC. The main stage...

The central part of the Namaqua Metamorphic Province was subjected to intense deformation under high-grade metamorphic conditions up granulite facies, but also shows greenschist facies overprints denoting nature during 1.2–1.0 Ga Namaquan Orogeny. This study examines structural development Kakamas Domain eastern Province, which has not been extensively studied previously. compressional orogenic...

The Avalon Peninsula on the island of Newfoundland, Canada, defined as type zone Avalonia, is believed to have been impacted by several orogenetic and deformation events since Neoproterozoic. Previous studies determined that lowest degree metamorphism reached in successions was prehnite–pumpellyite or greenschist facies. We sampled measured 13 mainly clastic sedimentary sections ranging from la...

There are two basic Fe-rich lithologies at Weld Range: (l) banded iron-formation containing minnesotaite, siderite, quarlz,magnetite, greenalite, stilpnomelane, pyrite, and chamosite with trace amounts of pyrrhotite, arsenopyrite, chalcopyrite, apatite, and rockbridgeite; Q) Fe-shale. which occurs as laminated 2-30cm-thick bands within banded iron-formation, containing chamosite, stilpnomelane,...

A microtectonic study was conducted in the Levac region of central Serbia. Here, tectonic contacts between Europe?derived units, including Serbo-Macedonian unit and Jurassic sedimentary cover European margin, Eastern Vardar Ophiolitic unit, are exposed at surface. The results indicate that contact zone underwent least two ductile contractional deformation phases. older contraction associated wi...

Structural and thermochronological data from the Sulu terrane of eastern China document the exhumation of high-pressure and ultrahigh-pressure (UHP) metamorphic rocks to upper-crustal depths by ca. 206 Ma. 40Ar/39Ar ages from K-bearing phases record recrystallization and cooling through amphiboliteand upper greenschist– facies conditions during top-to-the-NW noncoaxial shear and suggest cooling...

Introduction: The Bosumtwi crater has a diameter of 10.5 km and is located in the center of Ghana in West Africa (6o 30’ N and 1o 25’ W). Its age is 1.05 Ma and it forms a well preserved impact structure with a well defined rim. Its center is occupied by the closed basin of Lake Bosumtwi. The target rock is essentially composed of Proterozoic (2.1 to 2.2 Ga) units of the Birimian Supergroup tha...

The Wadi Hodein area contains a wide variety of late Precambrian igneous and metamorphic rocks, represented by gneisses, serpentinites, metagabbros, metasediments, metavolcanics, metagabbro-diorite, granodiorite and granitoids. The Wadi Hodein metavolcanics (WHV), including G. Khashab and G. El Anbat, represent one of the significant metavolcanic suites in the southern part of the Nubian Shield...

Carbonate-rich sandstones (samples 0708 and 0704) were collected from outcrop of the Gunflint Formation, Ontario, Canada (sample 0708: 48°29 ′24.4′′ N, 89°11′34.2′′ W; sample 0704: 48°29′24.6′′ N, 89°11′35.3′′ W). Samples contain 0.34 and 0.23wt% organic carbon. The estimated age for the Gunflint Formation is ca. 1.9 Ga (Fralick et al., 2002), and its metamorphic grade is considered to be sub-g...