When did the South Atlantic Ocean ventilate? Testing for paleogeographic controls on Cretaceous carbon burial

南大西洋什么时候开始换气？

• 批准号: 2243685
• 负责人: Matthew Malkowski
• 金额: $ 53.33万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-03-01 至 2026-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2243685&HistoricalAwards=false
• 关键词: When; did; South; Atlantic; Ocean

The oceans play a critical role in modulating Earth’s carbon cycle, climate, and habitability. Geoscientists rely on the sedimentary record of ocean basins to understand how the Earth and its oceans respond to geological and environmental change over long timescales. Ultimately, a better understanding of these feedbacks allows for predictions about how life on our planet has responded, or will respond, to external drivers such as climate or tectonics. This project will investigate links between physical surface processes, ocean oxygenation, and organic carbon burial during the establishment of the South Atlantic Ocean from 150-100 million years ago, a time period characterized by greenhouse to hothouse climate conditions. More broadly, this project will (1) generate new high school educational and professional development content; (2) enhance infrastructure for international research, collaboration, and community engagement in southern Patagonia; and (3) promote teaching, mentoring, and research with undergraduates in STEM.Continental break-up facilitates suitable conditions (e.g., restricted incipient ocean basins) for organic carbon burial. It is less clear, however, when/how these conditions are reversed by continued continental breakup and ocean basin ventilation and circulation. This project aims to determine the depositional response to local basin setting, regional tectonics, and global climate changes associated with the opening of a major oceanic gateway in the South Atlantic during the Early Cretaceous breakup of Gondwana. Preliminary results from southern Patagonia show there are discernable lithologic and chemostratigraphic boundaries in the stratigraphy of southern ocean basins recording changing environmental conditions. Constraining the timing of deposition with high precision geochronology and the chemical environments of deposition allows for comparisons between this study in Patagonia with age-correlative basins elsewhere. Moreover, through collaborations with Chilean paleontologists, the project will inform ongoing paleobiology studies of the environmental influences on the distribution and behavioral patterns of Cretaceous marine vertebrates.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.

海洋在调节地球的碳循环、气候和可居住性方面发挥着关键作用。地球科学家依靠海洋盆地的沉积记录来了解地球及其海洋如何在长时间尺度上对地质和环境变化作出反应。最终，更好地理解这些反馈可以预测我们星球上的生命如何回应，或将如何回应气候或构造等外部驱动因素。该项目将调查1.5亿至1亿年前南大西洋形成期间的物理表面过程、海洋氧化和有机碳埋藏之间的联系，这一时期的特点是温室到温室的气候条件。更广泛地说，该项目将（1）产生新的高中教育和专业发展内容;（2）加强巴塔哥尼亚南部国际研究，合作和社区参与的基础设施;（3）促进STEM本科生的教学，指导和研究。有限的初始海洋盆地）的有机碳埋藏。然而，目前尚不清楚这些条件何时/如何被持续的大陆分裂和海洋盆地通风和环流所逆转。该项目旨在确定沉积响应当地盆地设置，区域构造和全球气候变化与开放的一个主要的海洋门户在南大西洋在冈瓦纳古陆早白垩世解体。巴塔哥尼亚南部的初步结果表明，在记录不断变化的环境条件的南部海洋盆地的地层中，存在着可辨别的岩性和化学地层边界。限制沉积的时间与高精度的地质年代学和沉积的化学环境允许在巴塔哥尼亚与年龄相关的盆地在其他地方的这项研究之间的比较。此外，通过与智利古生物学家的合作，该项目将为正在进行的白垩纪海洋脊椎动物分布和行为模式的环境影响的古生物学研究提供信息。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值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

Modeling apparent Pb loss in zircon U–Pb geochronology

锆石 U-Pb 地质年代学中表观 Pb 损失的模拟

• DOI: 10.5194/gchron-6-37-2024
• 发表时间: 2024
• 期刊: Geochronology
• 作者: Sharman, Glenn R.;Malkowski, Matthew A.
• 通讯作者: Malkowski, Matthew A.

Detrital isotopic record of a retreating accretionary orogen: An example from the Patagonian Andes

后退增生造山带的碎屑同位素记录：巴塔哥尼亚安第斯山脉的一个例子

• DOI: 10.1130/g51918.1
• 发表时间: 2024
• 期刊: Geology
• 影响因子: 5.8
• 作者: Rey, F.M.;Malkowski, M.A.;Fosdick, J.C.;Dobbs, S.C.;Calderón, M.;Ghiglione, M.C.;Graham, S.A.
• 通讯作者: Graham, S.A.

BASIN-WIDE CHANGES REFLECTED BY LINKED GEOCHRONOLOGY AND GEOCHEMISTRY OF TWO STRATIGRAPHIC SECTIONS WITHIN THE EARLY CRETACEOUS ROCAS VERDES BASIN, PATAGONIA

巴塔哥尼亚早白垩世罗卡斯维德盆地两个地层剖面的地质年代学和地球化学关联反映的盆地范围变化

• DOI: 10.1130/abs/2023am-396136
• 发表时间: 2023
• 期刊: GSA Abstracts with Programs
• 作者: Daniel, Julia;Epperson, Jacqueline;Malkowski, Matthew A.
• 通讯作者: Malkowski, Matthew A.