Using accessory minerals of probes of crustal processes

利用地壳过程探针的副矿物

• 批准号: 330836-2009
• 负责人: Hanchar, John
• 金额: $ 3.41万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=515068
• 关键词: Using; accessory; minerals; probes; crustal

The objective of my research program over the next five years (and leading to the longer term ten-year time frame) is to gain a better understanding of the Earth's crustal processes recorded through chemical and isotopic variations in accessory minerals such as zircon, monazite, apatite, and titanite. To work towards that goal, I will utilize results obtained by doing in situ tracer radiogenic isotope measurements, including Lu-Hf in zircon and Sm-Nd in monazite, apatite, and titanite; the trace element compositions of those minerals; and U-Th-Pb geochronology. This comprehensive suite of complimentary geo-analytical techniques will be effectively and efficiently used to address a wide range of diverse geologic problems that collectively were not possible until recently. By studying the mineral-scale processes that have controlled the chemical and isotopic changes in the Earth's crust, we can help with the development of a more robust model for the evolution of the crust over time. As part of the Lu-Hf and Sm-Nd research, synthetic minerals will be grown at high-T, doped with elements and specific isotopes of elements, and then chemically and structurally characterized. These crystals will be used as isotopic standards for Hf in zircon and Nd in monazite, titanite, and apatite for radiogenic tracer isotope studies. The synthetic standards will then be used to obtain more precise and accurate in situ analyses of natural minerals using laser ablation multi collector inductively coupled plasma mass spectrometry. One area to be investigated over the next five years includes the granite-lower crustal xenolith connection using Mesozoic lower crustal xenoliths and granites from the Mojave Desert in SE California. This locality is ideal for studying the granite-source connection, as the source region and possibly related anatectic melts can be directly sampled. The source region of post-Alpine tonalites and related rocks from the Adamello batholith in northern Italy will also be studied as part of a larger collaborative research effort with colleagues in Switzerland. The third focus area will address the origin of iron ore, copper, gold (IOCG) and iron ore apatite (IOA) ore deposits and related rocks from the Norrbotten region (e.g., Kiruna) in northern Sweden.

我的研究计划在未来五年内的目的（并导致长期十年的时间范围）是为了更好地了解通过化学和同位素矿物质（例如氧化锆，独木舟，磷灰石和钛铁矿）记录的地球地壳过程。 为了实现这一目标，我将利用通过进行原位示踪剂放射异位素测量来获得的结果，包括锆石中的lu-hf和独居石，磷灰石和钛铁矿的SM-ND；这些矿物质的微量元素组成；和U-TH-PB年代学。 这套全面的免费地理分析技术将有效，有效地用于解决各种各样的地质问题，这些问题直到最近才不可能。 通过研究控制了地壳中化学和同位素变化的矿物尺度工艺，我们可以帮助开发更强大的模型，以随着时间的流逝而发展。 作为LU-HF和SM-ND研究的一部分，合成矿物将在高-T上生长，掺入元素和特定的元素同位素，然后在化学和结构上表征。 这些晶体将用作锆石中HF的同位素标准，并在独居石，钛铁矿和磷灰石中进行ND进行放射性示踪剂同位素研究。 然后，将使用激光消融多收集器电感耦合等离子体质谱法获得合成标准标准，以获得对天然矿物的更精确和准确的原位分析。 在接下来的五年中，将要研究的一个区域包括使用中生代的下层甲壳异种石和加利福尼亚州莫哈韦沙漠中的中生代下层壳异种石和花岗岩的花岗岩类壳异种石连接。 该局部性是研究花岗岩源连接的理想选择，因为可以直接采样源区域以及可能相关的解剖熔体。 在意大利北部的Adamello Batholith的高山通道和相关岩石的来源也将作为与瑞士同事进行更大的合作研究工作的一部分。 第三个焦点区域将解决来自瑞典北部Norrbotten地区（例如Kiruna）的铁矿石，铜，金（IOCG）和铁矿石磷灰石（IOA）矿石沉积物和相关岩石的起源。