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Provenance of the Neogene to Holocene sediments drilled by IODP Expedition 341 in the Gulf of Alaska. A single grain geochemical and geochronological study of the glacially influenced denudation history of the evolving St. Elias Orogen using heavy mineral

IODP 341 号探险队在阿拉斯加湾钻探的新近纪至全新世沉积物的来源。

基本信息

批准号：
261101193
负责人：
Professor Dr. Hans Heinrich Bahlburg
金额：
--
依托单位：
Institut für Geologie und Paläontologie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/261101193?language=en
关键词：
Provenance Neogene Holocene sediments drilled

项目摘要

The proposed case study investigates the temporal and spatial evolution of the large-scale mass transfer from the St. Elias Orogen, the highest coastal mountain belt on Earth, to the Gulf of Alaska over the last ca. 10 Ma. The targets are sands, silts and diamicts from two sites on the proximal and distal Surveyor Fan, respectively, drilled in the course of IODP Expedition 341 in 2013. The tools applied include single-grain geochemical analysis of heavy minerals. Initial geochemical data on hornblende, garnet and zircon point to a derivation mainly from the Chugach Terrane. The combination with U-Pb age dating of zircon with 40Ar-39Ar age dating of hornblende will allow for constraining the temporal link between onshore denudation and offshore deposition. In the 3rd project year applied for here we plan to concentrate on the provenance evolution during the Mid-Pleistocene Transition (MPT) by applying the same set of tools to a high resolution study of closely spaced samples of Site U1417. The MPT coincides with increased uplift of the St. Elias orogen and accelerated erosion of the mountain belt. This high-resolution approach will provide detailed information helping to reconstruct the relationship of climate change and changing erosion patterns across a major climate transition.

提出的案例研究调查了近10万年来地球上最高的沿海山带圣埃利亚斯造山带到阿拉斯加湾的大规模物质转移的时空演变。目标是2013年IODP远征341期间分别在近端和远端的两个地点钻探的沙子、粉砂和钻石。应用的工具包括重矿物的单粒地球化学分析。角闪石、石榴石和锆石的初步地球化学资料表明，它们主要来自楚格奇地体。结合锆石U-Pb年龄定年和角闪石40Ar-39Ar年龄定年，可以限制陆上剥蚀和海上沉积之间的时间联系。在这里申请的第三个项目年，我们计划通过将同一套工具应用于U1417站点紧密间隔的样品的高分辨率研究，专注于中更新世过渡（MPT）期间的物源演化。MPT与圣埃利亚斯造山带的上升和山带的加速侵蚀同时发生。这种高分辨率的方法将提供详细的信息，帮助重建气候变化与主要气候转变中不断变化的侵蚀模式之间的关系。