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A Late Cretaceous collision of the southernmost portion of the North American continental margin with an undetermined southern block was first established based on the sedimentation history of the plate's supracrustal cover, which is overthrust by harzburgite-dominated nappes of the Guatemala Suture Complex. The collision is also well registered in the metamorphic evolution of continental eclogites...
High Sr/Y plutons (Sr/Y>40) occupy large areas in ancient and modern orogenic belts, yet considerable controversy exists regarding mechanisms of their generation, the tectonic settings in which they form, and their relationship to contractional deformation through time. In the Blue Mountains province (NE Oregon), a suite of Late Jurassic (148–145Ma), high Sr/Y plutons intrude Middle Jurassic (162–157Ma),...
Granitic rocks in the Altun terrane, NW China crop out in a 50-km-long, E–W-trending belt along the southern margin of the Bashikaogong Basin, north Altun. They intrude the north Altun subduction complex and are hosted in Precambrian sandstones, schists, mudstones and tuffs. Four lithologic types are recognized; (I) gray, very coarsely phyric granite, (II) red, fine- to medium-grained, aphyric granite,...
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