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Rare earth elements and yttrium (REY) in glacial meltwaters and their potential impact on the REY distribution in Modern and Precambrian seawater

冰川融水中的稀土元素和钇（REY）及其对现代和前寒武纪海水中 REY 分布的潜在影响

基本信息

批准号：
209051764
负责人：
Professor Dr. Michael Bau
金额：
--
依托单位：
Department of Physics and Earth Sciences
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/209051764?language=en
关键词：
Rare earth elements yttrium REY

项目摘要

Global warming is accelerating the retreat of polar ice caps and alpine glaciers and enhances the input of glacial meltwater into the oceans. This situation is not unique in Earth history, as rapid deglaciation also characterized the end of major low-latitude glaciations (“Snowball Earth episodes”) in the Neoproterozoic and Paleoproterozoic. It has even been suggested that such input temporarily dominated the rare earths and yttrium (REY) inventory of Neoproterozoic seawater. However, little is known about the impact of glacial meltwaters on the seawater distribution of particle-reactive elements with short marine residence times, such as the REY. This is mainly due to (i) a quasi non-existing data base with regard to the REY distribution in glacial meltwaters and (ii) a lack of knowledge about the behaviour of those REY that are truly dissolved and those that are bound to inorganic (nano)particles (present as a component of rock flour and volcanic ash) during estuarine mixing with seawater. Thus, the distribution and behavior of trace elements, in particular of REY, will be studied in glacial meltwaters from Iceland and Greenland, that are typically poor in organic but very rich in inorganic (nano)particles (volcanic ash and rock flour). Meltwater impact on the distribution of REY in seawater will be determined by mixing experiments between glacial meltwaters and seawater in the laboratory. The results will then be used to better characterize the REY signature of continental run-off into the modern and the Precambrian oceans.

全球变暖正在加速极地冰盖和高山冰川的退缩，并增加冰川融水流入海洋。这种情况在地球历史上并不罕见，因为快速消融也是新元古代和古元古代主要低纬度冰川作用（“雪球地球事件”）结束的特征。甚至有人认为，这种输入暂时主导了新元古代海水中的稀土和钇（REY）库存。然而，人们对冰川融水对海洋停留时间短的颗粒反应元素（例如REY）的海水分布的影响知之甚少。这主要是由于（i）有关冰川融水中 REY 分布的准不存在的数据库，以及（ii）对真正溶解的 REY 以及在河口与海水混合期间与无机（纳米）颗粒（作为岩粉和火山灰的成分存在）结合的 REY 的行为缺乏了解。因此，我们将在冰岛和格陵兰岛的冰川融水中研究微量元素（特别是 REY）的分布和行为，这些冰川融水通常缺乏有机物，但富含无机（纳米）颗粒（火山灰和岩粉）。融水对海水中 REY 分布的影响将通过实验室中冰川融水和海水的混合实验来确定。然后，结果将用于更好地表征进入现代和前寒武纪海洋的大陆径流的 REY 特征。