Collaborative Research: Expedition 317 Objective Research - Linking Sediment Provenance to Supply and Lithofacies Formation on the Canterbury Margin
合作研究:317 号探险队目标研究 - 将坎特伯雷边缘的沉积物来源与供应和岩相形成联系起来
基本信息
- 批准号:1060844
- 负责人:
- 金额:$ 12.23万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-05-01 至 2014-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Longstanding goals of scientific ocean drilling include determining the timing and amplitudes of global sea-level change, as well as the role of eustacy in the generation and preservation of continental margin stratigraphy. However, continental margin sedimentation is a function of both allogenic and autogenic processes, and extracting a eustatic record requires an understanding of local sedimentary processes and their influence on strata formation. IODP Expedition 317 to Canterbury Basin, New Zealand provides an opportunity to identify the regional processes involved in the formation of sedimentary sequences where temporally evolving across-shelf and along-margin sediment sources potentially interact with both eustasy and tectonics to generate margin stratigraphy. This study defines sedimentary petrofacies using petrographic and X-ray diffraction techniques and combines them with lithofacies to characterize sedimentation within unconformity-bounded sequences. Differentiating the relative influence of each sediment source is made possible by the unique aspects of the onshore geology and sediment supplied by the rivers of South Island, New Zealand: in this system sediment composition is a proxy for transport mode/direction, with mica-rich schist detritus being brought in from the south, and graywacke Torlesse detritus from the west. Higher-resolution analyses will target specific seismic sequences from the Pliocene to Recent that represent changing climatic and eustatic conditions. A primary hypothesis tested is that recurring lithofacies motifs that likely formed during high-amplitude Pleistocene sea-level cycles can be linked to sediment provenance, and even where less lithologically distinct, a recognizable signal may remain in the detrital fraction. Another hypothesis is that the formation of Plio- Pleistocene sequences along the Canterbury Margin is strongly influenced by the relative sediment supply from alongshore/shelf (Clutha/Waitaki rivers) versus cross-margin (Rangitata-Ashburton-Rakaia braided system) transport, with the latter becoming more dominant in the later Pleistocene, potentially leading to an autogenic increase in accommodation space that lead to increased sequence preservation. A holistic approach is used to test these hypotheses, similar to that applied in the MARGINS Source-to-Sink focus site on North Island, New Zealand. This methodology links newly acquired data from onshore outcrops, stream and coastal deposits (collected in conjunction with New Zealand colleagues) to Expedition 317 results in order to evaluate potential basin-wide changes in sediment supply and distribution. Temporal changes in the relative timing and routing of sediment to the Canterbury margin are determined from comparisons between the cross-shelf (U1351, U1353, U1354) and the two Canterbury slope sites (ODP Site 1119 and U1352). Discrete mineralogical observations from this study eventually will be compared to and combined with high-resolution elemental and carbonate analyses proposed by Fulthorpe et al. to provide key petrologic and mineralogic constraints on core and seismic data interpretation for the margin, including distinguishing lithologic changes that might correspond to Milankovitch cyclicity. The history of global sea level change and the impact of future sea-level rise related to global warming are one of the foremost issues facing society. Drilling results from the Canterbury Margin represent a key global component of a comprehensive IODP program to extract sea-level information from continental margin stratigraphy. Our data and results will be made publically available through the IODP portal as part of the IODP Sample, Data, and Obligations Policy and through presentations at meetings and publications. This study will provide educational opportunities for a number of high school, undergraduate and graduate students at CSU Northridge and the University of Florida. One high school student from Florida will participate as part of the UF Student Science Training Program (UF-SSTP), a seven-week residential research program for junior and senior-level high schools students considering science careers. Two undergraduate and two graduate students will participate in this project from CSUN and UF, including students from underrepresented groups and it is expected this participation will form the basis for their theses (BS/MS) or dissertation. The project includes an educational outreach program at UF as part of the UF Geogator program that provides presentations to local K-12 programs about Earth and our environment. The program will make the research on global sea-level change accessible to the local Florida community, where rising sea level and the hazards associated with it are a growing societal concern.
科学海洋钻探的长期目标包括确定全球海平面变化的时间和幅度,以及海平面升降在大陆边缘地层形成和保存中的作用。然而,大陆边沉积是他生和自生过程的一个功能,提取海平面变化记录需要了解当地的沉积过程及其对地层形成的影响。对新西兰坎特伯雷盆地的IODP 317号考察提供了一个机会,可以确定沉积序列形成过程中涉及的区域过程,在沉积序列中,随时间变化的跨陆架和沿陆缘沉积物来源可能与地壳和构造相互作用,从而产生陆缘地层。本研究使用岩相学和X射线衍射技术定义沉积岩相,并将其与岩相相结合来表征不整合界面层序内的沉积作用。区分每个沉积物源的相对影响是可能的,由新西兰南岛河流提供的陆上地质和沉积物的独特方面:在这个系统中,沉积物成分是运输方式/方向的代理,富含云母的片岩碎屑从南部带入,杂砂岩Torlesse碎屑从西部。更高分辨率的分析将针对从上新世到近代的特定地震序列,这些序列代表了不断变化的气候和海平面变化条件。一个主要的假设测试是,经常性的岩相图案,可能形成在高振幅更新世海平面周期可以链接到沉积物的来源,甚至在岩性不太明显,一个可识别的信号可能仍然在碎屑部分。另一种假设是,沿坎特伯雷边缘沿着上新世-更新世层序的形成受到沿岸/陆架(Clutha/Waitaki河)与跨边缘(Rangitata-Ashburton-Rakaia辫状系)输送的相对沉积物供应的强烈影响,后者在更新世晚期变得更加占主导地位,可能导致可容纳空间的自生增加,从而增加层序保存。一个整体的方法是用来测试这些假设,类似的应用在北岛,新西兰的MARGINS源汇焦点网站。这种方法将新获得的陆上露头、河流和沿海沉积物(与新西兰同事一起收集)数据与317号考察队的结果联系起来,以评估沉积物供应和分布的潜在全流域变化。沉积物到坎特伯雷边缘的相对时间和路线的时间变化是通过跨大陆架(U1351,U1353,U1354)和两个坎特伯雷斜坡站点(ODP站点1119和U1352)之间的比较确定的。本研究的离散矿物学观察结果最终将与Fulthorpe等人提出的高分辨率元素和碳酸盐分析进行比较和结合,以提供对边缘岩心和地震数据解释的关键岩石学和矿物学约束,包括区分可能对应于Milankovitch旋回性的岩性变化。全球海平面变化的历史和与全球变暖有关的未来海平面上升的影响是社会面临的首要问题之一。坎特伯雷边缘的钻探结果代表了从大陆边缘地层中提取海平面信息的综合IODP计划的关键全球组成部分。我们的数据和结果将通过IODP门户网站作为IODP样本,数据和义务政策的一部分,并通过会议和出版物的演示文稿提供。这项研究将为CSU北岭和佛罗里达大学的一些高中生、本科生和研究生提供教育机会。来自佛罗里达的一名高中生将参加UF学生科学培训计划(UF-SSTP)的一部分,这是一个为期七周的住宅研究计划,供考虑科学职业的初中和高中学生使用。两名本科生和两名研究生将参加CSUN和UF的这个项目,包括来自代表性不足的群体的学生,预计这种参与将成为他们的论文(BS/MS)或论文的基础。该项目包括UF的教育推广计划,作为UF Geogator计划的一部分,该计划为当地K-12计划提供有关地球和我们的环境的演示。该计划将使当地佛罗里达社区能够了解全球海平面变化的研究,在那里,海平面上升及其相关的危害是一个日益增长的社会问题。
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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John Jaeger其他文献
John Jaeger的其他文献
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{{ truncateString('John Jaeger', 18)}}的其他基金
Collaborative Research: Sediment and Stability: Quantifying the Effect of Moraine Building on Greenland Tidewater Glaciers
合作研究:沉积物和稳定性:量化冰碛建筑对格陵兰潮水冰川的影响
- 批准号:
2234523 - 财政年份:2024
- 资助金额:
$ 12.23万 - 项目类别:
Standard Grant
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合作研究:将气候驱动的侵蚀变化与阿拉斯加南部边缘的构造过程联系起来
- 批准号:
1434402 - 财政年份:2014
- 资助金额:
$ 12.23万 - 项目类别:
Continuing Grant
Energetics and Stability of Geologically-Confined Water
地质封闭水的能量学和稳定性
- 批准号:
0819769 - 财政年份:2008
- 资助金额:
$ 12.23万 - 项目类别:
Standard Grant
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- 批准号:
0351043 - 财政年份:2004
- 资助金额:
$ 12.23万 - 项目类别:
Standard Grant
Collaborative Research: Establishing Marine Varve Thickness as a Proxy for Annual Alaska Climate Variability and PDO Oscillations, Hubbard Glacier Field Study
合作研究:建立海洋藻类厚度作为阿拉斯加年度气候变化和 PDO 振荡的代理,哈伯德冰川实地研究
- 批准号:
0326926 - 财政年份:2003
- 资助金额:
$ 12.23万 - 项目类别:
Standard Grant
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