A Predictive Framework for Micro-scale Carbonate Diagenesis: Towards More Accurate Reconstructions of Global Climate and Environmental Change

微尺度碳酸盐岩成岩作用的预测框架:更准确地重建全球气候和环境变化

基本信息

  • 批准号:
    2040145
  • 负责人:
  • 金额:
    $ 18.43万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2020
  • 资助国家:
    美国
  • 起止时间:
    2020-01-02 至 2023-08-31
  • 项目状态:
    已结题

项目摘要

Carbonate rocks are an ideal recorder of environmental conditions on our planet throughout Earth history because they have been forming throughout Earth's history across many environments on land and in the sea. However, throughout the long history of a carbonate rock, which can be millions of years or more, the rock can be buried to many kilometers depth, which exposes the rock to extreme temperatures and/or bring the rock into contact with water that can chemically alter the original minerals. In other words, the chemical records of Earth's environmental conditions within a carbonate mineral can alter under various conditions, and therefore the chemical values measured may not reflect the ancient environment as expected. Using 60 million year old marine rocks that were deposited in the Tethys Sea that existed at that time between India and Asia, the investigators have demonstrated that traditional tools may not identify all types of chemical alteration. The team's initial data and observations show that it is not yet understood how a carbonate rock can be chemically altered without leaving a visual trace of that alteration. In this study, the PIs will test their ability to use a novel chemical tool that determines the temperature at which a carbonate mineral forms by using other chemical tools that determine the age of that carbonate rock and are also sensititive to changes with burial. This technique could prove valuable for the oil and gas industry by providing additional tools for assessing the thermal maturity of oil-producing rocks in otherwise inaccessible basins where traditional tools cannot be used. Second, the PIs will test the capability of many chemical techniques that look for changes on extremely small scales to better learn how alteration happens and what fingerprints that alteration leaves behind. The result of the second part of this project will be a new tool for Earth scientists to use to identify altered geochemical signals from other carbonate minerals. This will improve reconstructions of modern and ancient environments based on carbonate minerals.Carbonates are highly susceptible to biological, physical, and chemical alteration after deposition. Carbonate 'clumped' isotope thermometry, T(delta cap 47), allows to more accurately and completely reconstruct ancient environments by providing measurements of carbonate formation temperature. High delta cap 47 values (low temperature) are often viewed as indicative of primary mineral formation temperature because clumping (delta cap 47) is typically thought to decrease during burial in the absence of later water-mediated recrystallization at Earth's surface. Preliminary data from buried Paleocene marine carbonates suggests this is an oversimplification; rather, marine carbonates show evidence of extensive oxygen exchange with non-marine 18O-depleted water and deep burial temperatures (150 degree C), but appear unaltered using conventional diagenetic screening metrics (i.e. optical petrography) and yield apparent low delta cap 47-derived temperatures. These observations highlight a knowledge gap in the isotopic effects of optically undetected carbonate alteration. The PIs will (a) test the capability of clumped isotope measurements paired with calcite U/Pb ages to reconstruct paragenetic sequences for sedimentary basin analysis and (b) optimize a suite of micro-analytical techniques to identify products of different alteration conditions, building a predictive framework for geochemical, textural, and isotopic fingerprints of 'stable mineral recrystallization.' The PIs will map crystallographic, elemental, and isotopic heterogeneity within carbonates to guide selection of higher spatial resolution delta cap 47 measurements.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.
碳酸盐岩是地球历史上环境条件的理想记录器,因为它们在整个地球历史上一直在陆地和海洋的许多环境中形成。然而,在碳酸盐岩的漫长历史中,可能有数百万年或更长时间,岩石可以被埋在许多公里深的地方,这会使岩石暴露在极端温度下,和/或使岩石与水接触,从而在化学上改变原始矿物。换句话说,碳酸盐矿物中地球环境条件的化学记录会在不同的条件下发生变化,因此测量的化学值可能不会像预期的那样反映古代环境。研究人员利用当时存在于印度和亚洲之间的特提斯海中沉积的6000万年前的海相岩石,证明了传统工具可能无法识别所有类型的化学蚀变。该团队的初步数据和观察表明,目前还不清楚碳酸盐岩如何在不留下可视痕迹的情况下进行化学变化。在这项研究中,PI将测试他们使用一种新型化学工具的能力,该工具通过使用其他化学工具来确定碳酸盐矿物形成的温度,这些化学工具可以确定碳酸盐岩石的年龄,并且对埋藏过程中的变化也很敏感。这项技术可能对石油和天然气行业有价值,因为它提供了额外的工具,用于评估原本无法进入的盆地中产油岩石的热成熟度,在这些盆地中,传统工具无法使用。其次,PI将测试许多化学技术的能力,这些技术寻找极小规模的变化,以更好地了解变化是如何发生的,以及变化留下了什么指纹。该项目第二部分的成果将为地球科学家提供一种新的工具,用于从其他碳酸盐矿物中识别出改变的地球化学信号。这将改善以碳酸盐矿物为基础的现代和古代环境的重建。碳酸盐岩在沉积后极易受到生物、物理和化学变化。碳酸盐“聚集”同位素测温仪T(增量帽47)通过提供碳酸盐形成温度的测量,允许更准确和完整地重建古代环境。高的三角洲帽47值(低温)通常被认为是原生矿物形成温度的指示,因为在埋藏过程中,如果地球表面没有后来的水介导的重结晶,块块(三角洲帽47)通常被认为是减少的。埋藏的古新世海相碳酸盐岩的初步数据表明,这是一种过于简单化的说法;相反,海相碳酸盐岩显示出与非海相18O枯竭水和深埋温度(150摄氏度)进行广泛的氧气交换的证据,但使用传统的成岩筛选计量学(即光学岩石学)似乎没有改变,并产生了明显的低三角洲盖层47派生的温度。这些观察结果突显了在光学上未检测到的碳酸盐蚀变的同位素效应方面的知识差距。PIS将(A)测试与方解石U/Pb年龄配对的成块同位素测量的能力,以重建用于沉积盆地分析的共生序列,以及(B)优化一套微观分析技术,以识别不同蚀变条件的产物,建立一个预测“稳定矿物重结晶”的地球化学、结构和同位素指纹的框架。PIS将绘制碳酸盐中的结晶、元素和同位素不均一性地图,以指导选择更高空间分辨率的Delta Cap 47测量。该奖项反映了NSF的法定使命,并通过使用基金会的智力优势和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Tools for Comprehensive Assessment of Fluid-Mediated and Solid-State Alteration of Carbonates Used to Reconstruct Ancient Elevation and Environments
用于重建古代海拔和环境的碳酸盐流体介导和固态蚀变综合评估工具
  • DOI:
    10.3389/feart.2021.623982
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    2.9
  • 作者:
    Ingalls, Miquela;Snell, Kathryn E.
  • 通讯作者:
    Snell, Kathryn E.
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Miquela Ingalls其他文献

Millennial-timescale thermogenic CO2 release preceding the Paleocene-Eocene Thermal Maximum
早于古新世-始新世极热事件的千年尺度生热二氧化碳释放
  • DOI:
    10.1038/s41467-025-60939-3
  • 发表时间:
    2025-06-30
  • 期刊:
  • 影响因子:
    15.700
  • 作者:
    Shijun Jiang;Ying Cui;Yasu Wang;Maurizia De Palma;B. David A. Naafs;Jingxin Jiang;Xiumian Hu;Huaichun Wu;Runjian Chu;Yangguang Gu;Jiuyuan Wang;Yizhou Huang;Miquela Ingalls;Timothy J. Bralower;Shiling Yang;James C. Zachos;Andy Ridgwell
  • 通讯作者:
    Andy Ridgwell

Miquela Ingalls的其他文献

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{{ truncateString('Miquela Ingalls', 18)}}的其他基金

CAREER: Understanding biosphere-geosphere coevolution through carbonate-associated phosphate, community archives, and open-access education in rural schools
职业:通过碳酸盐相关磷酸盐、社区档案和农村学校的开放教育了解生物圈-地圈协同进化
  • 批准号:
    2338055
  • 财政年份:
    2024
  • 资助金额:
    $ 18.43万
  • 项目类别:
    Continuing Grant
A dual clumped isotope approach to characterize disequilibrium in terrestrial carbonates
双簇同位素方法表征陆地碳酸盐的不平衡
  • 批准号:
    2244707
  • 财政年份:
    2023
  • 资助金额:
    $ 18.43万
  • 项目类别:
    Standard Grant
A predictive framework for micro-scale carbonate diagenesis: Towards more accurate reconstructions of global climate and environmental change
微尺度碳酸盐成岩作用的预测框架:更准确地重建全球气候和环境变化
  • 批准号:
    1826805
  • 财政年份:
    2018
  • 资助金额:
    $ 18.43万
  • 项目类别:
    Standard Grant

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