Session – Clays and Micro-Organisms


Clays and clay minerals are important components in soils, sediments, and sedimentary rocks, and they undergo biotic and abiotic reactions in natural environments. These mineral reactions impact a number of geological and environmental processes, such as sediment diagenesis, colloid transport, the mobility and the ultimate fate of organic and inorganic contaminants, integrity of waste repositories, and stability of the ocean floor.

We invite presentations, but not to limited, on microscopic/spectroscopic/geochemistry studies of clay mineral reactions at both laboratory and field scales. We especially encourage those who present the development of novel methods and/or novel applications of existing techniques with an interdisciplinary perspective.

Session convenor

Professor Kim Jinwook (South Korea)

Yonsei University

 

About the session convenor

Dr. Kim is a professor at the department of Earth System Sciences, Yonsei University, Seoul, Korea. He specializes in evolution of pelitic rocks over the range of burial diagenesis to low-grade metamorphism, clay mineralogy, microbes-clay mineral interaction, and microstructure of shale. Recently Dr. Kim researched the effects and a mechanism of microbial reduction in clay structures. He focused on the structural changes of bioreduced Fe-rich smectite. He discovered the neoformation of illite phase in bio-reduced smectite sample at room temperature, indicating that microbes play a significant role in promoting the smectite-to-illite (S-I) transformation. These results that challenge the conventional concept of S-I transformation and of reaction kinetics have far-reaching implications for the limit of biosphere. Dr. Kim also focused on the microbe-mineral interaction in the extreme environments including hydrothermal vent and Antarctic regions for biosignature in the mineral structure.