Mathematics – Logic
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esrv...18..215h&link_type=abstract
Earth Science Reviews, Volume 18, Issue 3-4, p. 215-239.
Mathematics
Logic
2
Scientific paper
A chronological outline of the principal tectonic-magmatic events of Ecuador is presented, based upon approximately 100 K/Ar and Rb/Sr age determinations. Eight magmatic episodes are recognized. In southwestern Ecuador evidence of plutonic and metamorphic activity in the Late Precambrian and in the Middle to Late Triassic is found. Large granitic batholiths of Middle to Late Jurassic age, associated with widespread acidic volcanism, are traceable along the eastern flank of the Andes into Colombia. Early Cretaceous volcanism and plutonism is recognized only in southern Ecuador, although apparently equivalent units continue southwards into the Coastal Cordillera of Peru. A great orogenic belt, characterized by metamorphism, plutonism, and volcanism, was established in the Late Cretaceous and continued through the Paleogene. It is traceable into Peru and Colombia. The Macuchi Fm. of the Western Cordillera along with the Pin˜ón Fm. and associated sediments of the coastal zone represent the remnants of an island arc and the adjacent oceanic floor, respectively, that collided with the South American Plate during the Eocene (Feininger, 1981). In the Neogene, quartz dioritic intrusions were emplaced in the Western Cordillera as well as in the Cordillera de Muelleturo, although apparently at different times. In the Late Oligocene and Miocene acidic volcanism is noted in the southern Ecuadorian Andes, but not in the north. In the Quaternary, andesitic volcanism and large stratovolcanoes characterize the northern Andes, while widespread rhyolitic ashflow activity is noted in the southern Andes. In Ecuador, the post-Triassic magmatic episodes show a westerly migration, similar to that found in Colombia, but opposite to that noted in Peru.
Calle Jorge
Hall Minard L.
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