COLLABORATIVE RESEARCH: Geochronological and Geological Characteristics of Terranes in the Central Georgia Piedmont

阿巴拉契亚山脉南部的山前已被证明涉及结晶岩石的主要逆冲，可能是由于地壳拆沉，但也被证明有证据表明，阿巴拉契亚山脉南部的山前的主要伸展特征因此存在争议，竞争模型具有相同的地体，既有北美本土的，也有外来的，并且在一个模型中有主要的边界断层伸展，另一种为挤压运动，第三种为走滑运动。这个以野外为基础的合作项目的中心是建立更重要的地体及其边界断层的历史。这项工作涉及佐治亚州梅肯附近的Belair、萨凡纳河和卡罗莱纳地体内的测绘、岩石学和年代测定，以及分隔卡罗莱纳河和萨凡纳河地体的莫多克断层。这些结果有望解决当前构造模型之间的主要分歧，并为检验地壳拆沉发生在晚古生代阿勒格汉期造山作用开始这一根本重要假设提供进一步的手段。

The Piedmont of the Southern Appalachians has been shown to involve major overthrusts of crystalline rocks, possibly due to crustal delamination, but have also been shown to have evidence for major extensional features of the Piedmont in the southern Appalachians is therefore controversial, with competing models having the same terranes both autochthonous with respect to North America and exotic, and having major boundary faults extensional in one model, compressional in another with strike-slip motion in a third. This collaborative, field-based project centers on establishing the history of the more important terranes and their bounding faults. The work involves mapping, petrology and age dating within the Belair, Savannah River and Carolina terranes near Macon, Georgia, and on the Modoc fault which separates the Carolina and Savannah River terranes. Results are expected to resolve points of major disagreement among current tectonic models and provide a further means of testing the fundamentally important hypothesis that crustal delamination occurred at the onset of the late Paleozoic Alleghanian orogeny.