Collaborative Research: Reconstructing the Origins of the Colorado River: An Integrative Study of the Miocene-Pliocene Bouse Formation

合作研究：重建科罗拉多河的起源：中新世-上新世布斯地层的综合研究

• 批准号: 1545986
• 负责人: Laura Crossey
• 金额: $ 19.42万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-02-15 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1545986&HistoricalAwards=false
• 关键词: Collaborative; Research; Reconstructing; Origins; Colorado

Despite nearly a century of study, the conditions that controlled initiation of the mighty Colorado River remain poorly understood and vigorously debated. This project seeks to reconstruct the origins of the Colorado River through multidisciplinary study of the Bouse Formation, a complex sedimentary deposit that accumulated in the lower reaches of the valley during river initiation between ~ 6.0 and 4.5 million years ago. The study benefits from collaborations among university professors and students, state and federal agency scientists, a county museum paleontologist, and a local high school teacher. The PI's will use integrated datasets to determine if the Bouse Formation formed in a brackish marine estuary or a large inland lake isolated from the ocean, a key distinction for understanding the origins of the river. This study also explores when and how waters of the Colorado River first reached the sea. Hypotheses will be tested through study of stratigraphic architecture, sedimentology, carbonate geochemistry (including C, O, Sr, and S isotopes), and geochronology. Hypothesis tests emphasize cross-correlation of radiogenic and stable isotope data with major and trace-element chemistry in a precise stratigraphic and structural framework. The PI's will run two workshops: one to engage a broad community of geoscientists, and one to plan a future scientific drilling proposal.

尽管经过了近一个世纪的研究，但控制着强大的科罗拉多河的开始的条件仍然对理解和辩论很大。该项目旨在通过对Bouse地层的多学科研究来重建科罗拉多河的起源，这是一个复杂的沉积沉积物，在河流启动期间，该矿床累积在山谷的下游，始于6.0至450万年前。该研究受益于大学教授和学生，州和联邦机构科学家，县博物馆古生物学家以及当地高中老师的合作。 PI将使用集成的数据集来确定在咸淡的海洋河口中形成的嘴形构造还是与海洋隔离的大型内陆湖，这是理解河流起源的关键区别。这项研究还探讨了科罗拉多河的何时以及如何首次到达大海。假设将通过研究地层结构，沉积学，碳酸盐地球化学（包括C，O，SR和S同位素）和年代学测试。假设检验强调了在精确的地层和结构框架中具有主要和痕量元素化学的放射原和稳定同位素数据的互相关。 PI将举办两个研讨会：一个研讨会：一个参与广泛的地球科学家社区，另一个是计划未来的科学钻探建议。

项目成果

Redefining the age of the lower Colorado River, southwestern United States

重新定义美国西南部科罗拉多河下游的年龄

• DOI: 10.1130/g48080.1
• 发表时间: 2021
• 期刊: Geology
• 影响因子: 5.8
• 作者: Crow, R.S.;Schwing, J.;Karlstrom, K.E.;Heizler, M.;Pearthree, P.A.;House, P.K.;Dulin, S.;Jänecke, S.U.;Stelten, M.;Crossey, L.J.
• 通讯作者: Crossey, L.J.

Detrital sanidine 40Ar/39Ar dating confirms <2 Ma age of Crooked Ridge paleoriver and subsequent deep denudation of the southwestern Colorado Plateau

• DOI: 10.1130/ges02319.1
• 发表时间: 2021-01
• 期刊: Geosphere
• 影响因子: 2.5
• 作者: M. Heizler;K. Karlstrom;M. Albonico;R. Hereford;L. Beard;S. Cather;L. Crossey;K. Sundell

Evaluating the Shinumo-Sespe drainage connection: Arguments against the “old” (70–17 Ma) Grand Canyon models for Colorado Plateau drainage evolution

评估 Shinumo-Sespe 排水系统连接：反对科罗拉多高原排水系统演化的“旧”（70-17 Ma）大峡谷模型的争论

• DOI: 10.1130/ges02265.1
• 发表时间: 2020
• 期刊: Geosphere
• 影响因子: 2.5
• 作者: Karlstrom, Karl E.;Jacobson, Carl E.;Sundell, Kurt E.;Eyster, Athena;Blakey, Ron;Ingersoll, Raymond V.;Mulder, Jacob A.;Young, Richard A.;Beard, L. Sue;Holland, Mark E.
• 通讯作者: Holland, Mark E.