نتایج جستجو برای: late neoproterozoic
تعداد نتایج: 196368 فیلتر نتایج به سال:
Abstract The Tarim craton in modern Central Asia was an important component of the supercontinent Rodinia Neoproterozoic, although its paleogeography during that era is still controversial. Here, we present new stratigraphic, geochemical, and geochronological data from Neoproterozoic sedimentary volcanic rock successions along northwestern margin discuss significance these our interpretations f...
The Staré Město Belt (SMB) in the Central Sudetes forms a Variscan tectonic boundary zone that is located between Saxothuringian and Brunovistulian terranes of Bohemian Massif. three thrust-bounded upper, middle lower lithotectonic units SMB are composed metasedimentary Late Cambrian metavolcanic rocks. A new LA-ICPMS zircon geochronology supported by typology studies mica schists upper unit mi...
The terminal Neoproterozoic Era (850-542 Ma) is characterized by the most pronounced positive sulfur isotope ((34)S/(32)S) excursions in Earth's history, with strong variability and maximum values averaging δ(34)S∼+38‰. These excursions have been mostly interpreted in the framework of steady-state models, in which ocean sulfate concentrations do not fluctuate (that is, sulfate input equals sulf...
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