COLLABORATIVE RESEARCH: Pressure-Temperature-Time Evolution of Central New England from Detailed Petrologic Structural and Geochronologic Studies

这项建议是要求延长对 F之间的合作。S. Spear（RPI）和T. M.哈里森 （加州大学洛杉矶分校）调查的压力-温度-时间演变 新英格兰中部通过详细的岩石学，结构和 地质年代学研究 这是一个正在进行的研究项目， 其最终目的是更好地了解构造和 新英格兰造山带的热演化。 已完成但 在目前的赠款下， 需要进行额外详细研究的项目 对阿卡迪亚造山带演化的限制。 提出 研究内容包括：（1）详细的岩石学、运动学分析和 沿着布朗森山复背斜的~（40）Ar/~（39）Ar年代学; 详细的岩石学、运动学分析和地质年代学， 佛蒙特州斯特拉福德穹丘附近;（3）年代学 和岩石学研究的斜长角闪岩， （4）佛蒙特州东部415-440 Ma角闪石40 Ar/39 Ar年龄; 整个新英格兰的额外40 Ar/39 Ar数据 更好地在新罕布什尔州和 佛蒙特州;和，（5）基于冷却历史的理论分析 本文研究了一种新的K-Ar ~（40）Ar/~（39）Ar释放谱的处理方法。 晶石。 我们将把我们的发现与地层学， 构造、古生物学和地球物理学的限制， 试图将这些数据整理成一个连贯一致的 解释。

This proposal is a request for a renewal of funding for the collaborative effort between F. S. Spear (RPI) and T. M. Harrison (UCLA) to investigate the pressure-temperature-time evolution of central New England through detailed petrological, structural and geochronologic studies. This is an ongoing research project, the ultimate goal of which is to understand better the tectonic and therm evolution of the New England orogenies. Work completed and in progress under the current grant has delineated several projects where additional, detailed research will provide needed constraints on the evolution of the Acadian orogen. Proposed studies include: (1) detailed petrology, kinematic analysis and 40Ar/39Ar geochronology along the Bronson Hill anticlinorium; (2) detailed petrology, kinematic analysis and geochronology and in the vicinity of the Strafford dome, Vermont; (3) geochronologic and petrologic study of amphibolites that display anomalously old (415-440 Ma) hornblende 40Ar/39Ar ages in eastern Vermont; (4) additional 40Ar/39Ar data throughout New England to delineate better the axis of hinged uplift between New Hampshire and Vermont; and, (5) theoretical analysis of cooling histories based on a novel treatment of 40Ar/39Ar release spectra from K- feldspars. We will integrate our findings with stratigraphic, structural, paleontological and geophysical constraints and attempt to reconcile these data into a coherent and consistent interpretation.