Pressure-temperature evolution of primordial solar system solids during impact-induced compaction

被引:120
作者
Bland, P. A. [1 ]
Collins, G. S. [2 ]
Davison, T. M. [2 ]
Abreu, N. M. [3 ]
Ciesla, F. J. [4 ]
Muxworthy, A. R. [2 ]
Moore, J. [2 ]
机构
[1] Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia
[2] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, Impacts & Astromat Res Ctr, London SW7 2AZ, England
[3] Penn State Univ, Earth Sci Program, Du Bois, PA 15801 USA
[4] Univ Chicago, Dept Geophys Sci, Chicago, IL 60430 USA
基金
英国科学技术设施理事会; 澳大利亚研究理事会; 英国自然环境研究理事会;
关键词
ORDINARY CHONDRITES; SHOCK METAMORPHISM; MELT PRODUCTION; ACCRETION; DEFORMATION; PROPAGATION; INCLUSIONS; CHRONOLOGY; CHONDRULES; HISTORIES;
D O I
10.1038/ncomms6451
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Prior to becoming chondritic meteorites, primordial solids were a poorly consolidated mix of mm-scale igneous inclusions (chondrules) and high-porosity sub-mm dust (matrix). We used high-resolution numerical simulations to track the effect of impact-induced compaction on these materials. Here we show that impact velocities as low as 1.5 km s(-1) were capable of heating the matrix to >1,000 K, with pressure-temperature varying by >10 GPa and >1,000 K over similar to 100 mu m. Chondrules were unaffected, acting as heat-sinks: matrix temperature excursions were brief. As impact-induced compaction was a primary and ubiquitous process, our new understanding of its effects requires that key aspects of the chondrite record be re-evaluated: palaeomagnetism, petrography and variability in shock level across meteorite groups. Our data suggest a lithification mechanism for meteorites, and provide a 'speed limit' constraint on major compressive impacts that is inconsistent with recent models of solar system orbital architecture that require an early, rapid phase of main-belt collisional evolution.
引用
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页数:13
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