Carboniferous geology and paleogeography of the USSR |
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| Abstract: | A combination of geological and isotopic-geochronological (K/Ar, 40Ar/39Ar, U-Pb-zircon methods) studies indicates that high-pressure-low-(in part, intermediate) temperature metamorphic rocks of both coherent complexes and inclusions in serpentinite melange were formed during Cretaceous and possibly to a small extent during Paleogene time. The original rocks are mostly of Jurassic and Cretaceous age. Pre-Jurassic metamorphic rocks have not been found within the complexes investigated. The metamorphic histories of many Cuban eclogites and garnet amphibolites were complex, but nevertheless reflect only a single Laramide tectono-metamorphic cycle. The discovery that the high-pressure meta-morphic rocks of Cuba are young confirms that major lateral displacement of crustal masses played a very important role in the structural development of the island. |
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