Advances in Cosmogenic Nuclides measured in Ferrar Pyroxene

Measurement of multiple cosmogenic nuclides in single samples is valuable for various applications. For exposure dating, multiple-nuclide systematics are important for correcting exposure ages for surface weathering and erosion, as well as quantifying when and how often a surface has experienced burial. Currently, such constraints from paired 26Al/10Be/21Ne measurements in quartz are common practice and well established. However, 36Cl/10Be/3He nuclide measurements in pyroxene would provide more precise constraints because the range in decay constants is greater. In Antarctica, the pyroxene-bearing Ferrar Dolerite is one of the dominant lithologies of clast exposed at the surface of many surficial deposits throughout the Transantarctic Mountains. While cosmogenic 3He measurements in Ferrar pyroxene are routine, 10Be and 36Cl measurements are less common and not well established. Here we present recent advances in multiple cosmogenic nuclides measured in the Ferrar pyroxene, which includes (i) improvements in the extraction of 10Be and 3He from pyroxene grains, (i) production rate estimates of 10Be in pyroxene and 36Cl from Ca spallation, and (iii) understanding and quantifying the non-cosmogenic inventories of 3He and 36Cl in pyroxene for accurate exposure dating.