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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.

拟议的案例研究调查了过去大约一年中从地球上最高的沿海山脉圣埃利亚斯造山带到阿拉斯加湾的大规模物质转移的时间和空间演变。 10马。目标是分别在 2013 年 IODP 341 号远征过程中钻探的位于 Surveyor Fan 近端和远端两个地点的沙子、淤泥和杂岩。所使用的工具包括重矿物的单颗粒地球化学分析。角闪石、石榴石和锆石的初步地球化学数据表明其主要源自楚加奇地体。锆石 U-Pb 年龄测定与角闪石 40Ar-39Ar 年龄测定相结合，将能够限制陆上剥蚀和近海沉积之间的时间联系。在这里申请的第三个项目年，我们计划通过应用同一套工具对 U1417 站点的紧密间隔样本进行高分辨率研究，重点研究中更新世过渡 (MPT) 期间的起源演化。 MPT 恰逢圣埃利亚斯造山带抬升加剧和山带侵蚀加速。这种高分辨率方法将提供详细信息，帮助重建气候变化与重大气候转变期间侵蚀模式变化的关系。