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

该提案是为F. S. Spear （RPI）和T. M. Harrison （UCLA）之间的合作提供资金的请求，旨在通过详细的岩石学、构造学和地质年代学研究来研究新英格兰中部的压力-温度-时间演化。这是一个正在进行的研究项目，其最终目标是更好地了解新英格兰造山运动的构造和热演化。在目前的资助下，已经完成和正在进行的工作已经划定了几个项目，在这些项目中，额外的、详细的研究将为阿卡迪亚造山带的演化提供所需的限制条件。拟进行的研究包括：(1)Bronson Hill背斜的详细岩石学、运动学分析和40Ar/39Ar年代学；(2)详细的岩石学、运动学分析和地质年代学，以及佛蒙特州Strafford圆顶附近；(3)美国佛蒙特州东部显示异常古老（415 ~ 440 Ma）角闪石40Ar/39Ar年龄的角闪岩年代学和岩石学研究；(4)在整个新英格兰地区增加40Ar/39Ar数据，以更好地描绘新罕布什尔州和佛蒙特州之间铰接隆起的轴线；(5)基于K-长石40Ar/39Ar释放光谱新处理的冷却历史理论分析。我们将把我们的发现与地层学、构造学、古生物学和地球物理的限制结合起来，并试图将这些数据调和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.