Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/27356
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Evidence for impact induced pressure gradients on the Allende CV3 parent body: Consequences for fluid and volatile transport
Author(s): Tait, Alastair W
Fisher, Kent R
Srinivasan, Poorna
Simon, Justin I
Keywords: meteorite
petrofabric
lineation
foliation
deformation
fluid
Issue Date: 15-Nov-2016
Citation: Tait AW, Fisher KR, Srinivasan P & Simon JI (2016) Evidence for impact induced pressure gradients on the Allende CV3 parent body: Consequences for fluid and volatile transport. Earth and Planetary Science Letters, 454, pp. 213-224. https://doi.org/10.1016/j.epsl.2016.09.015
Abstract: Carbonaceous chondrites, such as those associated with the Vigarano (CV) parent body, exhibit a diverse range of oxidative/reduced alteration mineralogy (McSween, 1977). Although fluids are often cited as the medium by which this occurs (Rubin, 2012), a mechanism to explain how this fluid migrates, and why some meteorite subtypes from the same planetary body are more oxidized than others remains elusive. In our study we examined a slab of the well-known Allende (CV3OxA) meteorite. Using several petrological techniques (e.g., Fry's and Flinn) and Computerized Tomography (CT) we discover it exhibits a strong penetrative planar fabric, resulting from strain partitioning among its major components: Calcium–Aluminum-rich Inclusions (CAIs) (64.5%CT) > matrix (21.5%Fry) > chondrules (17.6%CT). In addition to the planar fabric, we found a strong lineation defined by the alignment of the maximum elongation of flattened particles interpreted to have developed by an impact event. The existence of a lineation could either be non-coaxial deformation, or the result of a mechanically heterogeneous target material. In the later case it could have formed due to discontinuous patches of sub-surface ice and/or fabrics developed through prior impact compaction (MacPherson and Krot, 2014), which would have encouraged preferential flow within the target material immediately following the impact, compacting pore spaces. We suggest that structurally controlled movement of alteration fluids in the asteroid parent body along pressure gradients contributed to the formation of secondary minerals, which may have ultimately lead to the different oxidized subtypes.
DOI Link: 10.1016/j.epsl.2016.09.015
Rights: Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Licence URL(s): http://creativecommons.org/licenses/by-nc-nd/4.0/

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