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

Title: Pressure-temperature evolution of primordial solar system solids during impact-induced compaction
Authors: Bland, PA
Collins, GS
Davison, TM
Abreu, NM
Ciesla, FJ
Muxworthy, AR
Moore, J
Item Type: Journal Article
Abstract: Prior to becoming chondritic meteorites, primordial solids were a poorly consolidated mix of mm-scale igneous inclusions (chondrules) and high-porosity sub-μm 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 ~100 μm. 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.
Issue Date: 1-Dec-2014
Date of Acceptance: 2-Oct-2014
URI: http://hdl.handle.net/10044/1/21466
DOI: 10.1038/ncomms6451
ISSN: 2041-1723
Publisher: Nature Research
Start Page: 1
End Page: 13
Journal / Book Title: Nature Communications
Volume: 5
Copyright Statement: © 2014 The Authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/J001260/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
ORDINARY CHONDRITES
SHOCK METAMORPHISM
MELT PRODUCTION
ACCRETION
DEFORMATION
PROPAGATION
INCLUSIONS
CHRONOLOGY
CHONDRULES
HISTORIES
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
ORDINARY CHONDRITES
SHOCK METAMORPHISM
MELT PRODUCTION
ACCRETION
DEFORMATION
PROPAGATION
INCLUSIONS
CHRONOLOGY
CHONDRULES
HISTORIES
Publication Status: Published
Article Number: ARTN 5451
Online Publication Date: 2014-12-03
Appears in Collections:Earth Science and Engineering
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons