Low-grade metamorphic phosphate geochronology: High-precision dating of ancient crustal fluid flow, hydrothermal mineralisation and the "Great Oxidation Event"

低品位变质磷酸盐地质年代学：古代地壳流体流动、热液成矿和“大氧化事件”的高精度测年

• 批准号: DP0452196
• 负责人: Adj/Prof Birger Rasmussen
• 金额: $ 22.34万
• 依托单位: The University of Western Australia
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2004
• 资助国家: 澳大利亚
• 起止时间: 2004-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP0452196
• 关键词: Low; grade; metamorphic; phosphate; geochronology

Reliable dating techniques are required to obtain precise ages for ancient crustal fluid flow. Current techniques suffer from inheritance and isotopic resetting, problems that are particularly pronounced in early Precambrian rocks. This project will employ new analytical techniques to date phosphate minerals recently identified as potentially important new chronometers of ancient fluid flow, providing the first precise tectonothermal history of the Archaean Pilbara Craton. The project will also establish the age of giant iron-ore deposits across the Hamersley Province, test the various models for iron-ore formation, and provide a minimum age for the oxidation of the Earth's surface.

需要可靠的约会技术来获得古代地壳流体流的精确年龄。当前的技术患有遗传和同位素重置，这在早期前寒武纪岩石中特别明显。该项目将采用新的分析技术来确定磷酸盐矿物质最近被确定为古代流体流的潜在新的天文组织，这是古尔巴拉·克拉顿（Archaean Pilbara Craton）的第一个精确的构造史。该项目还将在哈默斯利省建立巨型铁矿沉积物的时代，测试各种铁矿石形成模型，并为地球表面的氧化提供最小的年龄。