COLLABORATIVE RESEARCH: Taconic vs. Acadian Tectonothermal Record in the Blue Ridge: Rb-Sr and 40 Ar/39 Ar Mineral Age Constraints

中国志留纪/早泥盆世化石新发现 蓝岭省西部的变质碎屑岩， 南阿巴拉契亚山脉质疑了 蓝岭构造演化的观点 含矿岩石 表明变质作用必须是泥盆纪或更年轻，而 许多已发表的放射性年龄表明奥陶纪 变质作用 这项研究将解决的程度和作用， 塔康（奥陶纪）变质作用与奥陶系（泥盆纪）变质作用， 因此古生物学和放射学之间的差异 数据 将在两口井中应用~（40）Ar/~（39）Ar和Rb/Sr地质年代学- 研究区域以限制变质作用的时间， 糜棱岩化和逆冲推覆作用 这项研究的结果将 解决目前围绕着地壳构造演化的争议 阿巴拉契亚山脉南部的蓝岭结晶岩。

Recent discoveries of Silurian/early Devonian fossils in metamorphosed clastic rocks of the western Blue Ridge province, southern Appalachians have called into question the prevailing views of Blue Ridge tectonic evolution. The fossiliferous rocks indicate that metamorphism must be Devonian or younger, whereas a number of published radiometric ages indicate Ordovician metamorphism. This study will resolve the extent and role of Taconic (Ordovician) versus Acadian (Devonian) metamorphism and thus the discrepancies between the paleontologic and radiometric data. 40Ar/39Ar and Rb/Sr geochronology will be used in two well- studied areas to constrain the timing of metamorphism, mylonitization and thrusting. The results of this study will resolve the current controversy surrounding the tectonic evolution of the Blue Ridge crystalline rocks of the southern Appalachians.