Linking high spatial resolution accessory mineral chemistry and geochronology to large-scale ore-forming hydrothermal processes in the crust.

将高空间分辨率辅助矿物化学和地质年代学与地壳中大规模成矿热液过程联系起来。

• 批准号: RGPIN-2019-05757
• 负责人: Adlakha, Erin
• 金额: $ 1.82万
• 依托单位: Saint Mary's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=715783
• 关键词: Linking; spatial; resolution; accessory; mineral

The chemistry of fluids and conditions during the formation of hydrothermal ore deposits can be recorded by the composition of accessory minerals that crystallize with ore minerals. In order to evaluate accessory minerals as recorders of the processes and conditions under which ore deposits form, detailed mineral characterization, at a single crystal to deposit scale, is required through high resolution, in-situ, chemical analysis. The long-term goal of this research program is to develop new applications of mineral chemistry in order to resolve uncertainties regarding the processes and conditions which form ore deposits. The proposed research will examine the controls and variation of phosphate mineral chemistry, with a focus on apatite (the most common phosphate in the crust) in two hydrothermal settings: high temperature W skarn deposits of the Canadian Cordillera, and low temperature unconformity-type U deposits (UTUD) of the Athabasca Basin, Saskatchewan. The short-term objectives of this proposal are to elucidate the following uncertainties regarding phosphate minerals & these hydrothermal systems: i) evaluate how the composition & variability of phosphates (particularly the ore and associated metal content) can resolve the source of fluids & metals in hydrothermal ore systems such as W skarn & UTUDs, ii) resolve phosphate mineralogy, mineral chemistry & isotope systematics in distinct high T & low T reaction zones; iii) determine how coeval minerals impact partitioning of metals & other trace elements between fluid-phosphate, and iv) assess the effects of secondary hydrothermal events on the composition of phosphates in order to evaluate the retention of trace elements, & conditions in which phosphates are altered &/or destroyed. Five projects are proposed to address the above objectives. These projects will be completed by PhD, MSc and BSc level HQP trainees under the applicant's supervision. The chemistry of phosphates will be investigated at a variety of scales using microanalytical techniques including electron probe microanalyser, laser ablation inductively coupled plasma mass spectrometry, and secondary ion mass spectrometry. The results will be regularly communicated to the public through conference presentations by HQP, and peer-reviewed scientific articles. The proposed research activities are innovative & significant to geoscientists & industry, as it will reveal the controls, distribution, & implications of ore metals in phosphates in hydrothermal systems. This information will be linked with isotopic data allowing the application of phosphate minerals to be extended to infer metal & fluid sources in hydrothermal environments, & identify other processes in time that led to ore deposition. In the long term, the proposed research program will continue to develop new applications for spatially resolved accessory mineral chemistry in barren and mineralized hydrothermal systems.

可以通过与矿石矿物质结晶的辅助矿物的组成来记录水热矿石沉积过程中流体和条件的化学性质。为了评估辅助矿物作为记录器的记录，矿床形成的过程和条件是通过高分辨率，现场，化学分析所需的矿物质矿物质（以单晶至沉积量表）的详细矿物表征。该研究计划的长期目标是开发矿物化学的新应用，以解决有关形成矿床的过程和条件的不确定性。 拟议的研究将检查磷酸盐矿物质化学的控制和变化，重点是两种水热环境中的磷灰石（是地壳中最常见的磷酸盐）：加拿大山do的高温W Skarn沉积物和低温不兼容型U型型U型U型U型（UT）（UTED）（UTED）（UTED）（UTED）（UTED）。 The short-term objectives of this proposal are to elucidate the following uncertainties regarding phosphate minerals & these hydrothermal systems: i) evaluate how the composition & variability of phosphates (particularly the ore and associated metal content) can resolve the source of fluids & metals in hydrothermal ore systems such as W skarn & UTUDs, ii) resolve phosphate mineralogy, mineral chemistry & isotope systematics in distinct high T和低T反应区； iii）确定偶联矿物如何影响金属和流体磷酸盐和iv之间的其他微量元素的分配，以及评估次级水热事件对磷酸盐组成的影响，以评估痕量元素的保留，以及磷酸盐被改变的磷酸盐的保留率。提出了五个项目来解决上述目标。这些项目将由申请人的监督下由博士，MSC和BSC级别HQP受训者完成。将使用微分析技术在各种尺度上研究磷酸盐的化学性质，包括电子探针微分析剂，激光消融电感性等离子体质谱法和次级离子质谱法。结果将通过HQP定期通过会议演讲，并经过同行评审的科学文章将其定期传达给公众。拟议的研究活动对地球科学家和工业具有创新性和重要意义，因为它将揭示水热系统中磷酸盐中矿石金属的控制，分布和含义。该信息将与同位素数据联系起来，允许将磷酸盐矿物扩展到水热环境中推断金属和流体源，并及时确定导致矿石沉积的其他过程。从长远来看，拟议的研究计划将继续为贫瘠和矿物化水热系统的空间分析辅助矿物化学的新应用开发新的应用。