Collaborative Research: Constraints on the Thermal Evolution of the Newark Basin by Means of Fission-Track and 40Ar/39Ar Thermochronology Using Drill Core Data

合作研究：利用钻芯数据通过裂变径迹和 40Ar/39Ar 热年代学约束纽瓦克盆地的热演化

• 批准号: 9117536
• 负责人: Garry Karner
• 金额: $ 7.36万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117536&HistoricalAwards=false
• 关键词: Collaborative; Research; Constraints; Thermal; Evolution

The primary objective of this project is to determine the thermal history of the Newark Basin via fission-track and 40Ar/39Ar analysis of sediment core from the Newark Basin Scientific Drilling Project and surface samples together with some geophysical modeling of the basin evolution. The principal investigators will undertake about 75 fission-track analyses consisting of both surface and subsurface samples. The vertical sections provided by the wells will provide geothermal gradient restraints and data from the intermediate age rift sediments whose outcrop distribution is poor. The surface samples will densify the regional age distribution and detail the recharge zone for hydrothermal circulation identified along the border fault by their earlier work. In addition to the fission-track analyses, approximately a dozen samples will be subjected to 40Ar/39Ar analysis. These samples will include Newark Basin clastics (surface and subsurface), granophyres from the Palisades Sill, and basement rocks adjacent to the Newark Basin. These will provide a higher-temperature framework with which to evaluate the fission-track data. In order to decipher the fission-track data, the principal investigators will numerically model the apatite age and track length distributions to invert for the temperature history of each sample. These estimates of the cooling history will be combined to determine the low temperature thermal evolution of the Newark Basin. The zircon and sphene fission-track ages will help to constrain the higher temperature thermal history.

该项目的主要目标是确定 利用裂变径迹和~（40）Ar/~（39）Ar研究纽瓦克盆地的热历史 纽瓦克盆地科学钻探沉积物岩心分析 项目和地表样本以及一些地球物理建模 盆地的演化。 主要研究人员将承担 大约75个裂变径迹分析，包括表面和 地下样本 威尔斯提供的垂直剖面 将提供地热梯度限制和数据， 中期裂谷沉积，露头分布较差。 地表样品将使区域年龄分布更加致密， 详细说明已确定的热液循环补给区 沿着边界断层。 除了有 裂变轨迹分析，大约有十几个样本将被 进行40 Ar/39 Ar分析。 这些样本将包括纽瓦克 盆地碎屑岩（地表和地下）， Palisades Sill和邻近纽瓦克盆地的基底岩石。 这将提供一个更高温度的框架， 评估裂变轨迹数据 为了破译裂变轨迹数据， 研究人员将对磷灰石的年龄和轨迹进行数值模拟， 长度分布反演的温度历史， sample. 这些对冷却历史的估计将被合并 来确定纽瓦克的低温热演化 盆地 锆石和辉石裂变径迹年龄将有助于 限制较高温度的热历史。