Dear Colleagues, We are pleased to invite you to submit an abstract to our session (*09f*) at Goldschmidt 2025. In this session we will explore the application of micro- and nanoscale imaging and spectroscopic techniques such as confocal Raman microscopy, scanning probe microscopy, and synchrotron-based methods to study complex biogeochemical processes, microbial interactions and mineral weathering. The submission deadline is 26 February 2025. Detailed information is provided below. Theme: Theme 09: Biogeochemical Cycles in Earth Systems Session Title: *09f Imaging and spectroscopic techniques for biogeochemistry, environmental and planetary sciences: from conventional to synchrotron-based microscopy techniques* Session Description: Micro and nanoscale imaging and spectroscopic analysis are critical for studying complex biogeochemical processes in fields of aquatic, terrestrial, and planetary sciences. Spatiotemporally sensitive measurements of microbial community dynamics, organo/microbe -mineral interfaces, and nanoscale mineral weathering processes in heterogeneous systems enable the decoupling of distinct biogeochemical reactions, allowing the investigation of relevant mechanisms. This session aims to advance our knowledge of using innovative imaging and spectroscopic techniques including confocal Raman microscopy, scanning probe microscopy, light-sheet fluorescence microscopy and synchrotron-based techniques (e.g., Scanning Transmission X-ray Microscopy (STXM), X-ray Fluorescence Microprobe (XFM), ptychography, X-ray Absorption Near Edge Structure (XANES)) to investigate biogeochemical reactions. We welcome contributions that: (1) utilize one or multiple imaging and spectroscopic techniques to study biogeochemical reactions; (2) employ novel experimental tools (e.g., microfluidics, correlative microscopy, in situ 3D imaging under cryo- or hydrated conditions, and bioreporters) to investigate microbial interactions; and (3) apply conventional and customized data analysis tools to interpret imaging results from across various analytical techniques. This session is supported by the “Synchrotron Earth and Environmental Science” (SEES) program funded by the National Science Foundation in the U.S., which aims to advance research and techniques that utilize synchrotron radiation facilities to Earth and Environmental studies. Best, Lim