Pure and applied problems in metamorphic petrology

变质岩石学的纯粹问题和应用问题

• 批准号: 37233-2011
• 负责人: Pattison, David
• 金额: $ 2.4万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=474762
• 关键词: Pure; applied; problems; metamorphic; petrology

Metamorphic petrology is concerned with changes in the mineralogy and textures of rocks in response to burial and heating in the Earth's lithosphere. It helps Earth scientists understand the thermal evolution of the Earth from 4 billion years ago to the present, understand ancient mountain building and other plate tectonic processes, decipher ore deposits that have been formed or modified by metamorphism, and account for geophysical anomalies in the unexposed lithosphere. The long range objectives of my research are two-fold: (1) to improve the specialized 'tools of the trade' of metamorphic petrology, in particular the techniques and understanding of what controls metamorphic mineral development; and (2) to bring these tools to bear on broader problems in Earth Science. The pure metamorphic petrology aims include: (1-1) improving the match between thermodynamically predicted mineral assemblages and their occurrence in nature; and (1-2) investigating the interplay between equilibrium, kinetics and rock deformation in metamorphism, with implications for the interpretation of metamorphic mineralogy and textures. This improved knowledge will be used to decipher mountain building (orogenic) events in the Canadian Cordillera and other orogenic belts, including: (2-1) discerning the character, timing and interface of contrasting domains of metamorphism in southeastern BC, with implications for the geological evolution of the Cordilleran margin from the time of its inception through to the cessation of orogenesis; (2-2) characterizing the contrasting metamorphic histories across select Eocene extensional faults in southeastern British Columbia, with implications for fault magnitude and deep crustal processes during orogenesis; and (2-3) searching for the extent and nature of newly-recognized post-tectonic metamorphism in the Rocky Mountains, with implications for local ore deposits. Techniques that will be applied include: field work; structural analysis; petrography; rock and mineral chemical/isotopic analysis; phase equilibrium calculations; and kinetic and thermal modeling. Participation of undergraduates, graduate students and post-doctoral fellows is essential to the success of the proposed work.

变质岩石学研究岩石的矿物学和结构因地球岩石圈的埋藏和加热而发生的变化。它有助于地球科学家了解从40亿年前到现在的地球热演化，了解古代造山和其他板块构造过程，破译变质作用形成或改造的矿床，并解释未暴露的岩石圈中的地球物理异常。我的研究的长期目标有两个：(1)改进变质岩石学行业的专门工具，特别是对控制变质矿物开发的技术和理解；(2)将这些工具应用于地球科学中更广泛的问题。纯变质岩石学的目标包括：(1-1)改进热力学预测的矿物组合与其在自然界中的赋存状态之间的匹配；(1-2)研究变质作用中平衡、动力学和岩石变形之间的相互作用，对变质矿物学和结构的解释具有重要意义。这一改进的知识将用于破译加拿大科迪勒拉和其他造山带中的造山(造山)事件，包括：(2-1)识别公元前东南部变质作用对比域的特征、时间和界面，这对科迪勒边缘从开始到造山停止的地质演化具有意义；(2-2)描述不列颠哥伦比亚省东南部部分始新世伸展断裂的对比变质历史，对造山过程中的断层规模和深部地壳过程的影响；以及(2-3)寻找新发现的落基山脉构造后变质作用的范围和性质，并对当地矿床产生影响。将采用的技术包括：实地工作；结构分析；岩石学；岩石和矿物化学/同位素分析；相平衡计算；以及动力学和热模拟。本科生、研究生和博士后研究员的参与对拟议工作的成功至关重要。