Journal
AMERICAN MINERALOGIST
Volume 103, Issue 9, Pages 1516-1519Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am-2018-6539
Keywords
Tissintite; high-pressure; high-temperature; shock; multi-anvil
Categories
Funding
- NASA Earth and Space Science
- RIS4E node of NASA's Solar System Exploration Research Virtual Institute
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- COMPRES, the Consortium for Materials Properties Research in Earth Sciences, under NSF [EAR 16-06856]
- Mineral Physics Institute, Stony Brook University
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Tissintite is a shock-induced, Ca-rich mineral, isostructural to jadeite, observed in several meteorite samples such as the martian shergottite Tissint. It may form within a Goldilocks Zone, indicating a potential to provide strict constraints on peak pressure and temperature conditions experienced during impact. Here we present the first laboratory synthesis of tissintite, which was synthesized using a large volume multi-anvil apparatus at conditions ranging from 6-8.5 GPa and 1000-1350 degrees C. For these experiments, we utilized a novel heating protocol in which we reached impact-relevant temperatures within 1 s and in doing so approximated the temperature-time conditions in a post-shock melt. We have established that heating for impact-relevant timescales is not sufficient to completely transform crystalline labradorite to tissintite at these pressures. Our findings suggest that tissintite forms from amorphous plagioclase during decompression.
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