Single-grain, multi-parameter characterization of detrital zircon grains to test for the influence of sample processing and sedimentologic processes

对碎屑锆石颗粒进行单颗粒、多参数表征，以测试样品处理和沉积过程的影响

• 批准号: 2121092
• 负责人: Emily Finzel
• 金额: $ 32.61万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2121092&HistoricalAwards=false
• 关键词: Single; grain; multi; parameter; characterization

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).A cornerstone of modern studies of sedimentary rocks is Uranium-Lead isotopic dating of zircon, a common mineral grain in sandstone. However, there is little understanding of how natural and induced bias can influence the outcome of dates. This project will focus specifically on quantifying: 1) the effect of crushing and grinding rocks prior to analysis, and 2) whether variation in hydraulic conditions during deposition influences zircon populations. The work of this project will lead to greater understanding of potential biases and lead to the development of mitigation strategies. This project will support partnerships between academia and government and engagement of pre-service and in-service teachers through a field experience around the Black Hills area in South Dakota.The objectives of this proposal are to test the influence of 1) standard mineral separation processes for detrital zircon studies on grain size, grain shape, and surface microtextures, 2) hydraulic sorting after negating or accounting for the effects of mineral separation with high-n analyses (n=600). A major outcome of this work will be new protocols for provenance studies that integrates traditional, current, and new techniques to clearly document sediment sources and transport history. Our workplan includes: 1) tandem processing of samples using traditional and newer approaches followed by high throughput particle analysis to comprehensively characterize particle size and shape, and 2) single-grain, multi-parameter characterization of detrital zircons to explore for correlations between age groups, grain size/shape, surface morphology, and sediment transport history in a variety of ancient lithofacies representing different hydraulic conditions. This research will elucidate any inherent biases related to mineral separation and depositional energies in sedimentary systems. Being able to decipher the ‘true’ provenance in sedimentary basins will lead to better paleogeographic and sediment dispersal interpretations and tectonic reconstructions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项是根据2021年《美国救援计划法》的全部或部分资助（公法117-2）。沉积岩石现代研究的基石是铀铅的同位素同位素约会，这是砂岩中常见的矿物谷物。但是，对自然和诱导的偏见如何影响日期的结果几乎没有理解。该项目将专门针对量化：1）在分析之前粉碎和打磨岩石的影响，以及2）沉积过程中氢化条件的变化是否影响锆石种群。该项目的工作将导致对潜在偏见的更多了解，并导致缓解策略的发展。该项目将支持学术界与政府之间的伙伴关系，并通过在南达科他州的黑山地区周围的现场经验与服务前和服务教师的参与。该提议的目标是测试1）1）标准矿物分离过程，用于对粒度，晶粒形状和表面分类的分类，对水平分类的影响，2）在2）对水平分类的影响，2）在2）较小的分类，2）在2）在2）进行了分类，2）在2）较低的分类，2）在2）在2）进行了较低的分类。 （n = 600）。这项工作的主要结果将是用于出处研究的新协议，该方案将传统，当前和新技术整合起来，以清楚地记录沉积物来源和运输历史。我们的工作场所包括：1）使用传统和较新的方法进行样品处理，然后进行高吞吐量粒子分析，以全面表征粒度和形状，以及2）单粒碎屑锆石的多参数表征，以探索年龄组之间的相关性，粒度/粒度/形状，表面形状，表面形态和沉积物的历史，代表了多种果仁果不同。这项研究将阐明与沉积系统中与矿物分离和沉积能有关的任何继承偏见。能够破译沉积低音中的“真实”出处将导致更好的古地理和沉积物分散解释和构造重建。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响来评估的珍贵的支​​持。