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Shock-induced mobilization of metal and sulfide in planetesimals: Evidence from the Buck Mountains 005 (L6 S4) dike-bearing chondrite
-
Alex Ruzicka
,
Ryan Brown
Veröffentlicht/Copyright:
24. November 2015
Abstract
The conditions under which metal cores formed in silicate-metal planetary bodies in the early Solar System are poorly known. We studied the Buck Mountains 005 (L6) chondrite with serial sectioning, X‑ray computed microtomography, and optical and electron microscopy to better understand how metal and troilite were redistributed as a result of a moderately strong (shock stage S4) shock event, as an example of how collisional processes could have contributed to differentiation. The chondrite was recovered on Earth in multiple small pieces, some of which have a prominent, 1.5-3 mm wide holocrystalline shock melt dike that forms a jointed, sheet-like structure, as well as an associated shock vein network. The data suggest that metal and troilite within the dike were melted, sheared, and transported as small parcels of melt, with metal moving out of the dike and along branching veins to become deposited as coarser nodules and veins within largely unmelted host. Troilite also mobilized but partly separated from metal to become embedded as finer-grained particles, vein networks, and emulsions intimately intergrown with silicates. Rock textures and metal compositions imply that shock melts cooled rapidly against relatively cool parent body materials, but that low-temperature annealing occurred by deep burial within the parent body. Our results demonstrate the ability of shock processes to create larger metal accumulations in substantially unmelted meteorite parent bodies, and they have implications for the formation of iron meteorites and for core formation within colliding planetesimals.
Keywords: Lunar and planetary studies; shock metamorphism; L6 chondrite; petrography; chondrite; olivine; kamacite; taenite; troilite; electron microscopy; FeNi metal
Received: 2014-10-19
Accepted: 2015-4-14
Published Online: 2015-11-24
Published in Print: 2015-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Lunar and planetary studies;
shock metamorphism;
L6 chondrite;
petrography;
chondrite;
olivine;
kamacite;
taenite;
troilite;
electron microscopy;
FeNi metal
Artikel in diesem Heft
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- When was the Earth’s conveyor belt set in motion?
- Trace element partitioning into sulfide: How lithophile elements become chalcophile and vice versa
- Petrology on Mars
- Hf and Nd isotope systematics of early Archean komatiites from surface sampling and ICDP drilling in the Barberton Greenstone Belt, South Africa
- Quasicrystals at extreme conditions: The role of pressure in stabilizing icosahedral Al63Cu24Fe13 at high temperature
- Tracking the thermal decomposition of plasma-sprayed hydroxylapatite
- Experimental constraints on bubble formation and growth during magma ascent: A review
- Ankerite grains with dolomite cores: A diffusion chronometer for low- to medium-grade regionally metamorphosed clastic sediments
- Crystal structure, high-pressure, and high-temperature behavior of carbonates in the K2Mg(CO3)2–Na2Mg(CO3)2 join
- Temperature micro-mapping in oscillatory-zoned chlorite: Application to study of a green-schist facies fault zone in the Pyrenean Axial Zone (Spain)
- Micro- and nano-characterization of Zn-clays in nonsulfide supergene ores of southern Peru
- Mineralogical characterization of individual growth structures of Mn-nodules with different Ni+Cu content from the central Pacific Ocean
- The magma plumbing system of the Emeishan large igneous province and its role in basaltic magma differentiation in a continental setting
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- Recommended mineral-melt partition coefficients for FRTEs (Cu), Ga, and Ge during mantle melting
- Tetrahedral plot diagram: A geometrical solution for quaternary systems
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- Temperature dependence of the velocity-density relation for liquid metals under high pressure: Implications for the Earth’s outer core
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- Apexite, NaMg(PO4)·9H2O, a new struvite-type phase with a heteropolyhedral cluster
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- The axial ratio of hcp Fe and Fe–Ni–Si alloys to the conditions of Earth’s inner core
- Shock-induced mobilization of metal and sulfide in planetesimals: Evidence from the Buck Mountains 005 (L6 S4) dike-bearing chondrite
- The accretion and differentiation of Earth under oxidizing conditions
- Dislocation microstructures in simple-shear-deformed wadsleyite at transition-zone conditions: Weak-beam dark-field TEM characterization of dislocations on the (010) plane
- Chemical composition and crystal structure of merrillite from the Suizhou meteorite
