Mineralisation of the Brothers Volcano, Kermadec Arc (IODP Expedition 376)

我们在此请求资金支持卡迪夫博士生安德鲁·马丁的巡航暂停后科学计划，他已被选为国际海洋发现计划（IODP）远征376“兄弟弧通量”（2018年5月5日至7月5日）的英国参与者。探险队376的目的是通过在太平洋西南部克马德克弧的兄弟火山进行科学钻探活动，调查海底火山海底热液矿化的基本过程。通过在水下火山顶部钻一系列的科学钻孔，探险队376的科学家们的目标是：(1)描述从岩浆到热液系统的挥发物的运输特征，并测试是否存在单相气体或两相盐水蒸汽系统；(2)研究微量金属和贱金属的分布，建立使其富集的物化条件；(3)量化了流体-岩石相互作用的程度，确立了岩浆源硫和碳在金属输运中的重要性；(4)评估系统中微生物生命的多样性和程度。安德鲁在船上的角色将是蚀变矿物学团队的一员。他将在描述和记录与兄弟热液系统相关的蚀变相方面发挥不可或缺的作用。他在卡迪夫的巡航后科学项目已得到远征376样品分配委员会的批准，他致力于对具有代表性的全岩和硫化物和硅酸盐材料的原位矿物样品进行一套全面的主要元素和微量元素分析，特别侧重于表征它们的基础、痕量和贵金属浓度和分布。卡迪夫的ELEMENT实验室在Iain McDonald博士的领导下，通过溶液和激光烧蚀质谱技术对这类材料进行分析，是世界领先的。安德鲁的分析将在帮助实现376远征的目标2和目标3方面发挥重要作用。安德鲁被选为376探险队的成员是对他在了解硫化物中关键和珍贵元素如何从岩浆环境转移到热液环境方面日益增长的专业知识的认可。这个过程（特别强调Te和Se）形成了他博士学位的主题，重点是塞浦路斯Troodos蛇绿岩的古代类似物。虽然显然与他的博士课题有着广泛的相关性，但376探险队的研究不太可能成为其中的一部分；因此，在我们收到的指导的基础上，我们正在为Andrew寻求3个月的津贴，除了分析费用之外，让他能够在不影响他的博士研究计划的情况下履行他的IODP职责。

We here request funds to support the post-cruise Moratorium science programme of Cardiff PhD student Andrew Martin, who has been selected as a UK participant on International Ocean Discovery Program (IODP) Expedition 376 'Brothers Arc Flux' (5th May to 5th July 2018). Expedition 376 aims to investigate the fundamental processes that govern sub-seafloor hydrothermal mineralisation in submarine volcanoes by conducting a scientific drilling campaign at the Brothers Volcano, Kermadec Arc, SW Pacific. By drilling a series of scientific boreholes into the summit of the underwater volcano Expedition 376 scientists aim to: (1) characterise the transport of volatiles from the magmatic to hydrothermal system, and test whether a single-phase gas or two-phase brine-vapour system exists; (2) investigate the distribution of trace and base metals and establish the physico-chemical conditions that lead to their enrichment; (3) quantify the extent of fluid-rock interaction and establish the importance of magma-derived sulphur and carbon species in metal transport; and (4) assess the diversity and extent of microbial life in the system.Andrew's role on board will be as a member of the Alteration Mineralogy team. He will play an integral role in characterising and logging the alteration facies associated with the Brothers hydrothermal system. For his post-cruise science programme in Cardiff, which has been approved by the Expedition 376 Sample Allocation Committee, he has committed to generating a comprehensive set of major and trace element analyses of representative whole-rock and in situ mineral samples of sulphide and silicate materials, focusing in particular on characterising their base, trace and precious metal concentrations and distributions. Cardiff's ELEMENT laboratory, under the leadership of Co-I Dr Iain McDonald, is a world leader in the analysis of such materials, by both solution and laser-ablation mass spectrometric techniques. The analyses Andrew will generate should play a vital role in helping to achieve objectives 2 and 3 of the wider Expedition 376 goals.Andrew's selection for Expedition 376 was in recognition of his growing expertise in understanding how critical and precious elements in sulphides are transferred from the magmatic to hydrothermal environment. This process (with particular emphasis on Te and Se) forms the subject of his PhD, which focuses on the ancient analogue of the Troodos ophiolite of Cyprus. Though clearly of broad relevance to the subject of his PhD, the Expedition 376 research is not likely to form part of it; hence, on the basis of the guidance we have received, we are seeking 3 months of stipend for Andrew, over and above the analytical costs, to allow him to meet his IODP responsibilities without jeopardising his PhD research programme.