Environmental Impacts of Caribbean Plateau Volcanism: Timing and Composition of Magmatic Activity Related to Ocean Anoxic Event 2
加勒比高原火山活动的环境影响:与海洋缺氧事件 2 相关的岩浆活动的时间和组成
基本信息
- 批准号:1028707
- 负责人:
- 金额:$ 29.37万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-08-15 至 2014-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Intellectual MeritOceanic plateaus are anomalously thick oceanic crust, believed to have formed rapidly by enhanced partial melting of the mantle. A natural consequence of such massive submarine volcanism is the release of extraordinary amounts of heat and metal-rich fluids to the ocean over geologically brief intervals, which are likely to have produced changes in ocean chemistry that lead to ocean anoxic events (OAEs) and selective extinctions of marine organisms. The Cretaceous was a period of extreme climatic conditions accompanied by major perturbations in ocean-atmosphere biogeochemical cycles. One of the most intriguing features is the sporadic interruption of normal marine pelagic sediment deposition by organic-rich sediments deposited during oxygen-deficient conditions (OAEs). A current model for the abrupt onset and conclusion of these events relates delivery of biolimiting trace metals (nutrients) to the surface ocean during massive volcanic activity associated with ocean plateau construction, that increased phytoplankton production and lead to the eventual depletion of oxygen in the deep ocean and deposition of organic-rich sediments. It is proposed that the trace metals were releasedin degassed magmatic fluids plus hydrothermal effluents dominated by water/rock exchange. This study will specifically evaluate the proposed link between metal release associated with the construction of the Caribbean plateau and OAE2 at the Cenomanian-Turonian (C/T) boundary (~93.5 Ma). This will be done by (1) establishing a firmer time scale for the initial,volumetrically dominant phase of Caribbean plateau magmatic activity from thick crustal sections exposed on the northern and southern margins of the intact central plateau (in Haiti and Curaçao/Aruba), and by (2) determining the abundances of select trace metals in parental magmas for submarine lavas through analysis of melt inclusions in olivines and pyroxenes, for comparison with elemental abundances in glassy pillow margins of the same rocks. Trace metal abundance anomalies, as well as isotopic excursions in Pb, Os and Nd, have already been identified in near-field and far-field marine sedimentary sections that record OAE2. These findings are consistent with release from Caribbean plateau lavas.Broader ImpactsWe will support and mentor a graduate student, including training in field sampling, in radiometric dating and micro-analytical methods. Undergraduate students will be recruited from our cooperative program with the University Honors College that requires a senior thesis for graduation http://oregonstate.edu/dept/honors/research/coasreu). This program is also a feeder for a new 5-yr honors B.S. + M.S. in Earth System science, offered jointly by COAS and Geosciences (EarthSystem5). Funding for these students will be leveraged through University research office support for undergraduate research. We also participate in an NSF-funded COAS summer site REU, and with undergraduate-oriented colleges with limited analytical facilities (Redlands and Pomona). Duncan and Kent will supervise students in research methods andwriting of senior theses/project reports at OSU. Findings will be conveyed to broader audiences through ongoing outreach activities, such as the Smithsonian Institution?s Ocean Hall, where Duncan?s work on LIPs is included as a video ?interview?, and in popular journals such as Oceanography [Coffin et al., 2007].
智慧的优点海洋高原是非常厚的海洋地壳,被认为是由于地幔的部分熔融而迅速形成的。这种大规模海底火山活动的一个自然后果是在地质学上短暂的间隔内向海洋释放大量的热量和富含金属的流体,这可能会导致海洋化学发生变化,导致海洋缺氧事件(OAE)和海洋生物的选择性灭绝。白垩纪是一个极端气候条件的时期,伴随着海洋-大气地球化学循环的重大扰动。最有趣的特征之一是在缺氧条件下沉积的富含有机物的沉积物零星地中断了正常的海洋远洋沉积物沉积。目前关于这些事件突然发生和结束的一个模型是,在与海洋高原建设有关的大规模火山活动期间,向海洋表层输送生物限制性微量金属(营养物),增加了浮游植物的产量,最终导致深海氧气耗尽,并沉积富含有机物的沉积物。微量金属的释放主要来自脱气岩浆流体和以水岩交换为主的热液流出物。本研究将具体评估与加勒比海高原建设相关的金属释放与Cenomanian-Turonian(C/T)边界(~93.5 Ma)的OAE 2之间的拟议联系。这将通过(1)从完整的中央高原的北方和南方边缘暴露的厚地壳部分,为加勒比高原岩浆活动的初始、体积上占主导地位的阶段建立一个更坚实的时间尺度(2)通过分析橄榄石和辉石中的熔融包裹体,确定海底熔岩母岩浆中某些微量金属的丰度,与相同岩石的玻璃枕边缘的元素丰度进行比较。在记录OAE 2的近场和远场海洋沉积剖面中,已经发现了痕量金属丰度异常以及Pb、Os和Nd的同位素偏移。这些发现与加勒比高原熔岩的释放是一致的。更广泛的影响我们将支持和指导一名研究生,包括实地取样、放射性测年和微观分析方法方面的培训。本科生将从我们与大学荣誉学院的合作项目中招募,该项目要求毕业论文(http://oregonstate.edu/dept/honors/research/coasreu)。该计划也是一个新的5年荣誉学士学位的馈线。+ M.S.在地球系统科学,由COAS和地球科学(地球系统5)联合提供。这些学生的资金将通过大学研究办公室对本科生研究的支持来利用。我们还参加了NSF资助的COAS夏季网站REU,并与分析设施有限的本科院校(雷德兰兹和波莫纳)。邓肯和肯特将监督学生在研究方法和写作的高级论文/项目报告在俄勒冈州立大学。调查结果将通过正在进行的外联活动传达给更广泛的受众,如史密森学会?海洋厅,邓肯在哪里?的工作在LIPs是包括作为一个视频?面试?,以及在流行的期刊如海洋学[Coffin等人,2007年]。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Robert Duncan其他文献
The relations between teacher-child relationships in preschool and children's outcomes in kindergarten
- DOI:
10.1016/j.appdev.2023.101534 - 发表时间:
2023-05-01 - 期刊:
- 影响因子:
- 作者:
Tanya M. Paes;Robert Duncan;David J. Purpura;Sara A. Schmitt - 通讯作者:
Sara A. Schmitt
Deadly combination
致命的组合
- DOI:
10.1038/527172a - 发表时间:
2015-11-11 - 期刊:
- 影响因子:48.500
- 作者:
Robert Duncan - 通讯作者:
Robert Duncan
Integrating Active Networking and Commercial-Grade Routing Platforms
集成主动网络和商业级路由平台
- DOI:
- 发表时间:
2000 - 期刊:
- 影响因子:0
- 作者:
R. Jaeger;S. Bhattachargee;Jeffrey K. Hollingsworth;Tal Lavian;F. Travostino;Robert Duncan - 通讯作者:
Robert Duncan
Serum ionized calciumvalues in relation to exchange transfusion
- DOI:
10.1016/s0022-3476(73)80079-4 - 发表时间:
1973-05-01 - 期刊:
- 影响因子:
- 作者:
Juan J. Gershanik;Abner H. Levkoff;Robert Duncan - 通讯作者:
Robert Duncan
Deadly combination
致命的组合
- DOI:
10.1038/527172a - 发表时间:
2015-11-11 - 期刊:
- 影响因子:48.500
- 作者:
Robert Duncan - 通讯作者:
Robert Duncan
Robert Duncan的其他文献
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{{ truncateString('Robert Duncan', 18)}}的其他基金
REU Site: Summer Intensive Research Experiences in Neuroscience (SIREN)
REU 网站:神经科学夏季强化研究经验 (SIREN)
- 批准号:
2243919 - 财政年份:2023
- 资助金额:
$ 29.37万 - 项目类别:
Continuing Grant
Collaborative Research: Evolution of the Tristan-Gough-Walvis Ridge Hotspot System: Age and Composition of Expedition 391/397T Volcanic Basement
合作研究:特里斯坦-高夫-沃尔维斯海岭热点系统的演化:391/397T 探险队火山基底的年龄和成分
- 批准号:
2317551 - 财政年份:2023
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
REU Site: Summer Intensive Research Experiences in Neuroscience (SIREN)
REU 网站:神经科学夏季强化研究经验 (SIREN)
- 批准号:
1852074 - 财政年份:2019
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
Native Americans in Science, Engineering and Natural Resources
科学、工程和自然资源领域的美洲原住民
- 批准号:
0552836 - 财政年份:2006
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
Collaborative Research: Re-Assessing Hotspot Models in the Pacific Basin With High Resolution 40Ar/39Ar Dating of Volcanic Activity in the Line Islands & Louisville Seamount Tr
合作研究:利用莱恩群岛火山活动的高分辨率 40Ar/39Ar 测年重新评估太平洋盆地的热点模型
- 批准号:
0351412 - 财政年份:2004
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
Collaborative Research: Investigation of the Origin of Non-Hotspot, Intraplate, Volcanic Ridges and Cross-Grain Gravity Lineations
合作研究:非热点、板内、火山脊和跨粒重力线的起源调查
- 批准号:
9912379 - 财政年份:2001
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
Native Americans in Marine Science
海洋科学领域的美洲原住民
- 批准号:
0003699 - 财政年份:2001
- 资助金额:
$ 29.37万 - 项目类别:
Continuing Grant
Collaborative Research: Assessing Hotspot Fixity in the Pacific Basin
合作研究:评估太平洋盆地的热点固定性
- 批准号:
0002875 - 财政年份:2001
- 资助金额:
$ 29.37万 - 项目类别:
Continuing Grant
The Timing, Duration and Correlation of North Atlantic Igneous Province Magmatism
北大西洋火成岩省岩浆活动的时间、持续时间和相关性
- 批准号:
9903056 - 财政年份:1999
- 资助金额:
$ 29.37万 - 项目类别:
Standard Grant
Radiometric Dating of Near-Ridge Seamounts by the 40Ar-39Ar Method
用 40Ar-39Ar 法对近海脊海山进行辐射测年
- 批准号:
9811136 - 财政年份:1998
- 资助金额:
$ 29.37万 - 项目类别:
Continuing Grant
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