Lath Structured Monazite from Haughton Dome, Canada Reveals Shock-Induced Tetragonal High Pressure Polymorph of REEPO4

Erickson, T M ; Timms, N E ; Pearce, M ; Cayron, C ; Keller, L P ; Deutsch, A

关键词: MONAZITE;    LAMELLA (METALLURGY);    MICROSTRUCTURE;    GRAIN FORMATION;    PHOSPHATES;    SHOCK LOADS;    HIGH PRESSURE;    RARE EARTH ELEMENTS;    DEFORMATION;    CRYSTALS;    MINERALS;    POLYMORPHISM;    TRANSMISSION ELECTRON MICROSCOPY;    SCANNING ELECTRON MICROSCOPY;    ELECTRON DIFFRACTION;    BACKSCATTERING;    CANADA;   

RP-ID  :  JSC-E-DAA-TN64828

学科分类：空间科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Shock deformed monazite, mono-clinic rare earth element (REE) phosphate, from the Haughton Dome impact structure, Nunavut, Canada, contain lath-structured lamellae. Microstructural phase heritage indicate the former presence of a previously unreported, shock-produced, tetragonal-structured, high pressure polymorph of REEPO4. This study presents an electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) study of shock deformed monazite from the historic sample DIG-9, a shock stage III, biotite sillimanite gneiss sample from near the central uplift of the Haughton Dome (75°22'20"N, 89°40'50"W), in which shock features in monazite were first described.