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Determination of fluid sources in the Paleochori Bay hydrothermal system, Milos Island (Greece)

确定米洛斯岛（希腊）Paleochori 湾热液系统中的流体来源

基本信息

批准号：
416973271
负责人：
Professor Dr. Thomas Pichler
金额：
--
依托单位：
Fachgebiet Geochemie und Hydrogeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/416973271?language=en
关键词：
Determination fluid sources Paleochori Bay

项目摘要

Historically most research on marine hydrothermal venting focused primarily on deep-sea, black smoker-type locations, although approximately 70 locations of marine shallow-water hydrothermal vent systems (MSWHS) were documented. MSWHS usually consist of a combination of gas vents and hydrothermal springs, discharging into the shallow coastal marine environment where they can have a considerable impact on the biology by creating micro-environments due to the discharge of reduced, hot hydrothermal fluids often containing potentially toxic elements, such as, As and Hg.One of the best studied MSWHS is located in Paleochori Bay on the south side of Milos Island, which due to its peculiar biogeochemistry has been the focus of numerous scientific studies. However, despite more than 25 years of research we do not have a dependable biogeochemical model concerning the interaction between hydrothermal and biological processes, nor do we have reliable repeat measurements at single locations. This is owed to the fact there are no GPS coordinates given for any of the sites studied and thus, although descriptions of the general locations and characteristics of vent sites exist for most of the investigations, returning to those specific sites is virtually impossible.A likely solution to this quandary at Milos and a potential aide to many other studies of MSWHS could be the generation of geo-referenced maps with help of aerial photography, because due to their shallow nature, hydrothermal features are discernable from the surface. With the possibility to obtain GPS coordinates directly from the map it will be possible to pick exact locations for sample collection, including temperature and flux measurements. Furthermore, it is possible to correlate hydrothermal features between their actual occurrence and their representation on the photographic map, i.e., to ground-truth the aerial map.The creation of a digital aerial map whose features were confirmed by direct observation will be the basis for a GIS platform to be used for past and ongoing research in Paleochori Bay, while the developed techniques will be easily transferred to other sites of shallow-water hydrothermal venting. Generation of such a map would, for the first time, allow unprecedented understanding of locations and chemistry of each vent site, as well as to provide an estimate of overall total hydrothermal fluxes and the associated Hg and As concentrations. This work has significance beyond Paleochori Bay since this approach will be easily transferable to other sites of MSWHS worldwide.

从历史上看，大多数关于海洋热液喷口的研究主要集中在深海、黑烟型地点，尽管有大约70个海洋浅水热液喷口系统的记录。MSWHS通常由气体喷口和热液泉的组合组成，排放到浅水沿海海洋环境中，由于排放的减少，热液流体通常含有潜在的有毒元素，如As和Hg，它们可以通过创造微环境对生物产生相当大的影响。研究最好的MSWHS之一位于米洛斯岛南侧的Paleochori湾，由于其独特的地球化学，一直是众多科学研究的焦点。然而，尽管进行了超过25年的研究，我们没有一个关于热液和生物过程之间相互作用的可靠的地球化学模型，我们也没有可靠的重复测量在单个位置。这是因为没有为所研究的任何地点提供全球定位系统坐标，因此，尽管大多数调查都有喷口地点的一般位置和特征的说明，回到这些特定的地点几乎是不可能的。米洛斯的这一困境的一个可能的解决方案和许多其他MSWHS研究的潜在助手可能是生成地质-由于热液的性质较浅，从表面就可以辨别出热液的特征，因此，在航空摄影的帮助下参考了地图。由于有可能直接从地图上获得全球定位系统坐标，因此将有可能选择样本采集的确切位置，包括温度和通量测量。此外，有可能将热液特征的实际存在与其在摄影地图上的表示相关联，即，数字航空地图的制作，其特征通过直接观察得到确认，这将是一个地理信息系统平台的基础，用于过去和正在进行的古乔里湾研究，而开发的技术将很容易转移到其他浅水热液喷口地点。绘制这样的地图将首次使人们能够前所未有地了解每个喷口的位置和化学性质，并提供对热液总通量和相关汞和砷浓度的估计。这项工作的意义超出了古乔里湾，因为这种方法将很容易转移到世界各地的MSWHS的其他网站。