AGE AND TECTONIC SIGNIFICANCE OF HIGH-PRESSURE METAMORPHIC ROCKS OF CUBA
AGE AND TECTONIC SIGNIFICANCE OF HIGH-PRESSURE METAMORPHIC ROCKS OF CUBA
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古巴高压变质岩的年龄和构造意义
DOI：
10.1080/00206819209465587
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发表时间：
1992
影响因子：
2.6
通讯作者：
E. Kolesnikov
中科院分区：
文献类型：
--
作者：
M. Somin;M. M. Arakelyants;E. Kolesnikov
地质和同位素年代学(K/Ar、40Ar/39Ar、U-Pb-锆石方法)相结合的研究表明，蛇纹岩混杂岩中的共格杂岩和包裹体的高压-低温(部分中温)变质岩形成于白垩纪，可能在古近纪有少量形成。原始岩石主要为侏罗纪和白垩纪。在所调查的杂岩中没有发现前侏罗纪变质岩。许多古巴榴辉岩和石榴石角闪岩的变质历史是复杂的，但只反映了一个单一的拉拉米德构造-变质旋回。古巴高压变质岩的发现是年轻的，这证实了壳体的主要侧向位移在该岛的构造发展中起了非常重要的作用。
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.