My research focuses on the extraterrestrial formation of alteration minerals within Martian meteorites. These hydrous mineral assemblages provide an opportunity to gain key insights into the past Martian fluid reservoirs (hydrosphere) and the ancient atmosphere of Mars. I build on previous investigations by employing a new radioisotopic dating program and geochemical characterization of the alteration veins. This work uses state of the art instrumentation including X-ray Computed Tomography, NanoSIMS and a high-sensitivity, high resolution multicollector noble gas mass spectrometer (HELIX-SFT) for 40Ar/39Ar dating. These studies integrate data collected using these analytical instruments and results from FIB-SEM, Raman, TEM and EPMA and new preparation techniques to provide a comprehensive investigation of Mars’ history through meteorite analyses.