Mesoproterozoic Tectonic Evolution of the Southern Margin of Laurentia

9706692莫舍了解北美晚元古代的一个主要问题与格伦维尔造山作用及其与所涉及的地壳块体的关系有关。在五大湖以南，相关岩石的暴露几乎是不存在的，因此拉诺隆起的暴露，以及德克萨斯州西部的暴露，在破译这些关系方面变得异常关键。事实上，那里确实存在的暴露似乎揭示了一个相当复杂的历史，不仅有典型的下地壳格伦维尔岩石，还有榴辉岩，可能是大陆中部格兰特-流纹岩地体的碎片，以及迄今未被识别的火山地体。对这些岩石的地质年代学、岩石学和构造研究将提供基本的限制性和决定性数据，这些数据将强烈限制我们对格伦维尔南部地区构造演化的理解。

9706692 Mosher A leading problem in understanding the late Proterozoic of North America relates to the Grenville orogeny and its relationship to the crustal blocks involved in it. South of the great lakes exposure of the relevant rocks is almost non-existent, and thus the exposures of the Llano uplift, and those in west Texas become unusually critical in deciphering these relationships. In fact, the exposures that do exist there seem to reveal a rather more complicated history of not only typical lower crustal Grenville rocks, but also eclogites, possible fragments of the mid continental Grainte-Rhyolite terrane, and a so-far unrecognized volcanic terrane. This geochronological, petrological, and structural study of these rocks will provide fundamental limiting and defining data that will strongly constrain our understanding of the tectonic evolution of the southern Grenville region.