Age and Stable Isotope Evolution of Mississippi Valley-Type Mineralization in the Appalachian Orogen

这项研究将包括：1)详细的硫和勘测O-H同位素分析，以圈定MVT省并约束成矿卤水和硫的来源；2)对新设计的闪锌矿87Sr/86Sr定年方法进行评价，并应用该方法确定MVT成矿年龄。这些资料将被用来确定阿巴拉契亚山脉南部和中部MVT成矿作用、前陆盆地发育和变形之间的关系，并测试在晚古生代阿勒格尼亚造山之前发生重大流体迁移和可能的岩浆成矿的可能性。这一研究结果将为地席成矿的成因、碰撞边缘盆地中卤水运动的时间以及盆地卤水排出机制提供深入的认识。

This study will involve: 1) Detailed sulfur and reconnaissance O-H isotopic analyses designed to delineate MVT provinces and constrain sources of mineralizing brines and sulfur, 2) evaluation of newly designed 87Sr/86Sr dating method for sphalerite, and application of this method to determine the age of MVT mineralization. These data will be used to determine the relation between MVT mineralization, foreland basin development, and deformation in the southern and central Appalachians, and to test the possibility that significant fluid migration and possible MAT mineralization preceded the Late Paleozoic Alleghenian orogeny. The results should provide insights into the genesis of MAT mineralization, the timing of brine movement in collisional margin basins, and mechanisms of basinal brine expulsion.