Isotope systematics and shock-wave metamorphism. I - U-Pb in zircon, titanite, and monazite, shocked experimentally up to 59 GPa. II - U-Pb and Rb-Sr in naturally shocked rocks; the Haughton Impact Structure, Canada

Details Isotope systematics and shock-wave metamorphism. I - U-Pb in zircon, titanite, and monazite, shocked experimentally up to 59 GPa. II - U-Pb and Rb-Sr in naturally shocked rocks; the Haughton Impact Structure, Canada Isotope systematics and shock-wave metamorphism. I - U-Pb in zircon, titanite, and monazite, shocked experimentally up to 59 GPa. II - U-Pb and Rb-Sr in naturally shocked rocks; the Haughton Impact Structure, Canada

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3427d&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Dec. 1990, p. 3427-3447. Research supported by NSERC, Ministere de l'

Computer Science

13

Lead Isotopes, Metamorphism (Geology), Rock Mechanics, Titanium Compounds, Uranium Isotopes, Zirconium Compounds, Birefringence, Grain Size, Lunar Geology, Meteoritic Composition, Monazite Sands, Shock Wave Interaction

Scientific paper

Results are presented on U-Pb isotope analyses on experimentally shocked (at 35, 47.5 and 59 GPa) zircon, titanite, and monazite extracted from Proterozoic granitoid rocks, along with U-Pb and Rb-Sr in naturally shocked rocks, zorcon, and monazite obtained from the Haughton Impact Structure (Canada). Results show that shock pressures up to 59 GPa and corresponding high temperatures (above 1200 C) do not measurably affect U-Pb systematics even in U-rich silicates and phosphates, indicating that the U-Pb system is not a reliable chronometer to date impact events in moderately to highly shocked rocks, if post-collisional cooling is rapid. U-Pb and Rb-Cr data obtained on naturally shocked rocks also indicate that, for shock-waves greater than 5O GPa, neither U-Pb systematics in zircon and monazoite nor Rb-Sr data on whole rocks and minerals are reliable chronometers to date the impact event.

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