Pressure-Temperature-Time Evolution of the Acadian Orogen, Central New England: Constraints from Detailed Petrologic and Geochronologic Studies: Collaborative Research

新英格兰中部阿卡迪亚造山带的压力-温度-时间演化：详细岩石学和地质年代学研究的限制：合作研究

• 批准号: 8707569
• 负责人: Timothy Harrison
• 金额: $ 5.02万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707569&HistoricalAwards=false
• 关键词: Pressure; Temperature; Time; Evolution; Acadian

This proposal represents a collaborative effort between F.S. Spear of Rensselaer Polytechnic Institute and T.M. Harrison of SUNY-Albany. The objective of the proposed research is the determination of pressure-temperature-time paths for metamorphic rocks from central New England during the Acadian orogeny. The areas chosen for study comprise four transects across central Massachusetts, southern New Hampshire and Vermont, and northern new Hampshire. Pressure-temperature paths of metamor- phism will be determined for rocks of different structural levels utilizing a combination of petrologic techniques including geothermobarometry, zoned metamorphic prophyroblasts, petrogenetic grids, and textural analysis. P-T paths will be correlated with structural evolution through analysis of mineral growth in relation to fabric development. Age constraints on the cooling histories of the rocks will be obtained from analysis of 40 Ar/39 Ar release spectra in hornblende, muscovite, biotite and K-feldspar. Zircon chronology on the ANU SHRIMP ion microprobe will be used to obtain absolute ages on pluton emplacement and to constrain the timing of structural development. The ultimate goal of this research is to obtain 4- dimensional (x-y-z-time) control on the thermo-tectonic behavior of the crust during the Acadian orogeny. It is anticipated that these results will lead to an improved understanding of the evolution of the continental lithosphere during collisional orogenesis in general.

该提案代表了以下方面的合作努力： F.S. Rensselaer Polytechnic Institute的Spear和T.M.哈里森 纽约州立大学奥尔巴尼分校 拟议研究的目标是 变质作用压力-温度-时间轨迹的确定 产自新英格兰中部的一种岩石。 选择进行研究的地区包括四个横断面， 马萨诸塞州中部、新罕布什尔州南部和佛蒙特州，以及 北方新罕布什尔州。 异色效应的压力-温度路径 不同构造的岩石， 利用岩石学技术组合的水平 包括地质温压法、分区变质的成红细胞、 岩石成因网格和结构分析。 P-T路径将是 通过分析， 矿物生长与织物发育的关系。 年龄 对岩石冷却历史的限制将是 通过分析40 Ar/39 Ar释放光谱， 角闪石、白云母、黑云母和钾长石。 锆石 ANU SHRIMP离子微探针的年表将用于 获得岩体侵位的绝对年龄， 结构发展的时间。 本研究的最终目标是获得4- 热构造行为的三维（x-y-z-时间）控制 地壳的最高温度 预计 这些结果将有助于我们更好地理解 碰撞过程中大陆岩石圈的演化 一般的造山作用。