Stable Potassium and Iron Isotopes in Apollo 17 core 73001-2

Stable potassium and iron isotopes in Apollo 17 double drive tube 73001/2. Measurements were made on the <1 mm size fraction from the 0.5 cm intervals of dissection Pass 2, after chemical dissolution and column chemistry using the Thermo Scientific Neptune Plus multicollector inductively coupled plasma mass spectrometer at Washington University in St. Louis. Isotopes are reported in delta notation in per mil units. Potassium isotopes are relative to the standard NIST SRM 3141a and iron isotopes are relative to the standard IRMM-014.