Distinctive uppermost Ediacaran–Ordovician rocks (Avalonian overstep sequence) were key in definition of Avalonia, which comprises large areas the NE Appalachians and Caledonian Variscan mountains (Britain western Europe). This siliciclastic-dominated cover succession unconformably overlies a Neoproterozoic pre-Avalonian basement collage (arc, continental, oceanic fragments; Gwna-type melanges ...

[1] A >500-km-long east-west trending metamorphic belt in the Qiangtang terrane of central Tibet consists of tectonic melange that occurs in the footwalls of Late Triassic–Early Jurassic domal low-angle normal faults. The melange is comprised of a strongly deformed matrix of metasedimentary and mafic schists that encloses lesser-deformed blocks of metabasites, Carboniferous–Triassic metasedimen...

New calcite Sr/Sr data for 47 limestones from the metamorphosed and deformed Neoproterozoic–Cambrian Dalradian Supergroup of Scotland and Ireland are used to identify secular trends in seawater Sr/Sr through the Dalradian succession and to constrain its depositional age. Dalradian limestones commonly have Sr .1000 ppm, indicating primary aragonite and marine diagenesis. Low Mn, Mn/Sr ,0.6, O an...

Sr and C isotopic data obtained on stratigraphic suites of well-preserved marine limestone from Siberia, Namibia, Canada, Svalbard and East Greenland provide a relatively detailed first-order record of isotopic variation in seawater through the late Neoproterozoic Era. This data is used to revise the SrrSr and dC curves of this important interval, during which several discrete global ice ages o...

Background. In this paper, the authors aim to reveal localization patterns of gold mineralization in Phuok Son region Central Vietnam, which formed a Proterozoic-Cambrian metamorphic complex zone Late Paleozoic Benzhang–Queshon granite block. Aim. To determine Phuoc area, Vietnam. Materials and methods. The research was based on geological materials, as well mine working appraisal data. materia...

We present zircon (U-Th)/He(ZHe) data for 17 Proterozoic basement samples from elevation profiles on the three peaks in Front Range of Colorado that are at elevations over 14,000 ft. (4267 m, locally known as “fourteeners”), with complementary Raman a sample subset. ZHe dates Longs Peak northern uniformly Late Cretaceous to Eocene (37 ± 1 Ma 137 2 Ma), while those Mt. Evans (34 606 18 Ma) and P...

The study area is a part of so-called Sanandaj-Sirjan zone or Zagros imbricate zone of the Zagros Orogen, Iran. The Hamedan region comprises a metamorphic sequence of low- to high-grade regional and contact metamorphic rocks intruded by mafic, intermediate and felsic plutonic bodies. The sequence comprises pelitic, psammitic, mafic, calc-pelitic and calc-silicate rocks.  Pelitic rocks are the m...

Abstract The Sao Francisco Craton (SFC) and its marginal Aracuai Brasilia orogens exhibit a significant diversity in their lithospheric architecture. These were shaped during the Neoproterozoic–Cambrian amalgamation of West Gondwana. rigid cratonic lithosphere SFC relatively weak Orogen disrupted Cretaceous opening South Atlantic Ocean, whereas remained continental hinterland. In earlier resear...

Late Precambrian to early Cambrian sediments of the Amadeus Basin, Central Australia, contain two stable directions of magnetization. Lithologies are diverse and include red beds, green beds, and carbonates, all of which respond to thermal cleaning. Positive fold and unconformity tests, and a well-defined polarity zonation reveal the primary component and direction of magnetization. This direct...