Mineral studies applied to geological problems

应用于地质问题的矿物研究

• 批准号: 2669-2008
• 负责人: Wicks, Frederick
• 金额: $ 1.09万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=419608
• 关键词: Mineral; studies; applied; geological; problems

The Mantle is essentially composed of anhydrous minerals (contain no water) but geological processes carry water down into the Mantle along subduction zone mainly in rocks called serpentinites. Water can also have access to the Mantle along fracture systems that develop when Mantle rocks are obducted onto crustal rocks when tectonic plates collide. I am studying a series of mantle and upper crustal rocks called an ophiolite complex that has been thrust up in Cornwall, UK. These rocks have been studied before but no one has recognized the importance of a complex and extensive vein system in these rocks. These fractures have allowed water into the heart of the ophiolite complex altering the rocks, filling the fractures with new minerals and lubricating the rocks so that they could be obducted to their present position. The mineralogy of the veins reflects the falling temperature regime in which they form: high-temperature veins with feldspar, amphibole and clinochlore, medium-temperature veins with talc, clinochlore and serpentine and low-temperature veins with clinochlore, saponite and sepiolite. Determining the mineralogy and the chemical composition of these vein minerals will allow me to determine the conditions they formed under and the source of the water.

地幔基本上是由无水矿物组成的（不含水），但地质作用将水沿着沿着俯冲带带入地幔，主要是在称为蛇纹岩的岩石中。 水也可以通过沿着断裂系统进入地幔，这些断裂系统是在构造板块碰撞时地幔岩石仰冲到地壳岩石上时形成的。 我正在研究一系列地幔和上地壳岩石，称为蛇绿岩复合体，它在英国康沃尔被推高。 这些岩石以前曾被研究过，但没有人认识到这些岩石中复杂而广泛的脉系统的重要性。 这些裂缝使水进入蛇绿岩复合体的中心，改变了岩石，用新的矿物填充裂缝，润滑岩石，使它们能够仰冲到现在的位置。 矿脉的矿物学反映了它们形成时的温度下降状态：含长石、角闪石和斜绿泥石的高温矿脉，含滑石、斜绿泥石和蛇纹石的中温矿脉，含斜绿泥石、皂石和海泡石的低温矿脉。 确定这些矿脉矿物的矿物学和化学成分将使我能够确定它们形成的条件和水源。