Palaeozoic and Proterozoic zircons from the Mid-Atlantic Ridge

Article Abstract:

The theory of plate tectonics states that rocks found close to mid-ocean ridges, where oceanica plates are formed, should be only a few million years old. A new discovery of zircons found in the vicinity of the Mid-Atlantic Ridge shows ages of around 330 and 1,600 million years. It is suggested that these unusually old zircons could have been exposed as a result of upshearing or could have been trapped within the Kane fracture zone following a series of transform fractures.

Research, Plate tectonics, Zircon, Mid-Atlantic Ridge

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Evolution of the Altaid tectonic collage and Palaeozoic crustal growth in Eurasia

Article Abstract:

Eurasia grew by about 5.3 million square km during the Palaeozoic era. Nearly half this growth came from juvenile crust drawn from the mantle. Study of the Altaids, a geological structure surrounding the ancient core of Eurasia, suggests that giant subduction-accretion complexes grew along an arc from Siberia to the Baltic. These systems may have contributed up to 48% of the Earth's continental growth during their active period.

Models, Geology, Stratigraphic, Stratigraphy, Origin, Paleozoic Era, Eurasia, Morphotectonics, Continents

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