Prof. Aleksandr Stepanov [中国地质大学(武汉)]

Title: How do we analyse pyrite and what can we learn from pyrite composition

Language:  English presentation

Time: Beijing, 16:00 - 17:00 PM, Friday, March 15, 2024

Place: Conference room A516, HPSTAR (Beijing)             

Host:  Dr. Huijuan Li

Abstract:

Pyrite is the most common sulfide in the Earth crust, ubiquitous in sedimentary, metamorphic and (altered) magmatic rocks. Pyrite is particularly abundant in ore deposits, where it could be a major host for valuable metals. For example, it is estimated that about a third of current gold production comes from pyrite lattice-locked gold. Geochemistry of pyrite is increasingly popular research direction in economic geology and sedimentary geochemistry, and many aspects are in a state of rapid development. Measurement of trace element composition of pyrite in sedimentary rocks is challenging due to wide range of chalcophile elements, fine-grain size and intergrowth with silicate matrix and other sulfide minerals. Interpretation of phase relations of pyrite is complicated by limitations of the experimental data. This presentation will report overview of pyrite geochemistry and report recent developments in pyrite analysis by time-resolved LA-ICP-MS data and new interpretation of pyrite-arsenopyrite phase relations, which are essential for understanding of sulfide mineral associations.

Brief introduction of the speaker: 

STEPANOV ALEKSANDR，萨沙，2002年和2004年在俄罗斯Novosibirsk州立大学分别获得学士和硕士学位，2012年获得澳大利亚国立大学地质学博士学位。2012年-2019年先后在澳大利亚塔斯马尼亚大学任博士后和研究员，2019年3月任中国地质大学(武汉)资源学院教授、博士生导师。目前主要从事矿床学、矿床地球化学以及原位微区测试技术等方面的研究工作。以第一/通讯作者在Geology，Geochimica et Cosmochimica Acta，Economic Geology，Contributions to Mineralogy and Petrology，Journal of Petrology，Chemical Geology，Lithos，American Mineralogist，Gondwana Research，Ore Geology Reviews等期刊上发表SCI论文40余篇。

主要研究领域：

战略性关键金属元素的地球化学行为和富集机制(Geochemistry of rare strategic metal deposits. Role of anatexis and metamorphism in concentration of rare metals)；矿物形成过程的模拟、流体/熔体/矿物分配在地球化学问题中的应用 (Modelling of mineral--forming processes, application of fluid/melt/mineral partitioning to geochemical problems)；LA-ICP-MS的开发及其在地质问题和矿产勘探中的应用(Development of LA-ICP-MS and its application to geological problems and mineral exploration)；利用矿物成分重建蚀变晕并指导找矿 (Use of mineral compositions for reconstruction of alteration halos and vectoring to potential mineral resources).