This study aims to characterize the nature and extent of impact-induced shock-deformation in Tenham and a suite of L-chondrites. The goals of the project include: (1) to constrain the extent of deformation of olivine in the sample suite with comparison to other published L-chondrites, (2) to determine the temperature of the sample suite parent bodies during impact and (3) to use shock thermobarometric methods to constrain the pressure-temperature-pulse duration time (P- T-t) conditions of the sample suite. EBSD deformation metrics used in this study include grain orientation spread (GOS) which measures the average misorientation in a mineral grain, R2-10 which yields the syn-deformational temperature conditions of olivine, and the skewness ratio (Skd>50/Skd5-15), which measures the extent of annealing (microstructural recovery) of olivine
grains post-impact. We present thin-section scale electron backscatter diffraction (EBSD) large area maps (LAMs) and targeted maps (TMs) of Tenham to conclude the following: (1) average GOS of Tenham host olivine is 2.69° ± 1.73° (n=29,873). (2) R2-10 indicates an olivine temperature of deformation of 654 °C ± 102 °C. (3) The skewness ratio of olivine grains in Tenham is 0.95, which suggests no significant post-deformation annealing. (4) Tenham contains a ~1 mm wide (at widest dimension) shock vein with a fine-grained (~1-5 μm) matrix of majorite-pyrope (maj-pyr) grains. The uniform mineral assemblage in the vein indicates equilibrium shock pressures of ~17- 23 GPa. Overall, results indicate shock-reheating on a cool L-chondrite parent body followed by rapid cooling consistent with other published Tenham and L-chondrite data