Experimental Study of Pt Solubility in the CO-CO2 Fluid at Low fO2 and Subsolidus Conditions of the Ultramafic-Mafic Intrusions

The solubility of Pt in CO-CO2 fluid was studied experimentally at P = 50–200 MPa and T 950 °C. A mixture MgC2O4 MgCO3 used as a source the fluid. Upon reaction capsule walls fluid, carbonyl platinum is formed. use high-temperature quartz ceramics trap avoids effect mechanical contamination with from eroded walls. total content porous traps measured by Electrothermal Atomic Absorption (ET-AAS) method. In some experiments, local analysis carried out Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) composition bubbles captured an albite glass micro-Raman spectroscopy. On MgO, “whiskers” submicron diameter were observed, which formed product decomposition during quenching. About 5–15% withstands quenching resulting 1.5 to 2 ppm soluble acetone (runs 200 MPa) trap. amount corresponds concentration up 8 high 2000–3000 determined carbon coated MgO matrix. Our study demonstrated that 15–150 ppm, presumably form Pt3(CO)62− under conditions corresponding subsolidus stage layered ultramafic-mafic ultramafic-alkaline intrusions formation. preliminary data showed this will increase addition water low fO2.