来自阿巴拉契亚南部变质岩的密西西比纪化石及其对晚古生代构造演化的意义。
Mississippian fossils from southern appalachian metamorphic rocks and their implications for late paleozoic tectonic evolution.
作者信息
Gastaldo R A, Guthrie G M, Steltenpohl M G, Gastaldo R A, Steltenpohl M G
出版信息
Science. 1993 Oct 29;262(5134):732-4. doi: 10.1126/science.262.5134.732.
Fossils of Periastron reticulatum Unger emended. Beck recovered from the Erin Slate of the Talladega slate belt of Alabama establish that these rocks have a Mississippian (Kinderhookian-Tournaisian) age. The Talladega slate belt, the southwestern extension of the western Blue Ridge belt, was interpreted to have been affected by regional dynamothermal metamorphism and coeval deformation as a result of the Acadian orogeny. This fossil find indicates that metamorphism and deformation of the Talladega belt occurred after the Early Carboniferous (Alleghanian), requiring a reevaluation of tectonic interpretations of the southernmost Appalachians.
经修订的网状近星介（Unger emended. Beck）化石，是从阿拉巴马州塔拉迪加板岩带的艾琳板岩中发现的，这表明这些岩石的年代为密西西比纪（金德胡克期—杜内期）。塔拉迪加板岩带是西部蓝岭带的西南延伸部分，被认为受到了区域动力热变质作用以及同期由于阿卡迪亚造山运动而产生的变形的影响。这一化石发现表明，塔拉迪加带的变质作用和变形发生在早石炭世（阿勒格尼期）之后，这就需要对最南端阿巴拉契亚山脉的构造解释进行重新评估。
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