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Origin of magnetite crystals in martian meteorite alh84001 carbonate disks
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Clemett, S. J. McKay, D. S. Thomas-Keprta, K. L. Wentworth, S. J. Gibson, E. K. |
| Copyright Year | 2010 |
| Description | Martian meteorite ALH84001 preserves evidence of interaction with aqueous fluids while on Mars in the form of microscopic carbonate disks which are believed to have precipitated approx.3.9 Ga ago at beginning of the Noachian epoch. Intimately associated within and throughout these carbonate disks are nanocrystal magnetites (Fe3O4) with unusual chemical and physical properties, whose origins have become the source of considerable debate. One group of hypotheses argues that these Fe3O4 are the product of partial thermal decomposition of the host carbonate. Alternatively, the origins of Fe3O4 and carbonate may be unrelated; that is, from the perspective of the carbonate the magnetite is allochthonous. We have sought to resolve between these hypotheses through the detailed characterized of the compositional and structural relationships of the carbonate disks and associated magnetites with the orthopyroxene matrix in which they are embedded [1]. We focus this discussion on the composition of ALH84001 magnetites and then compare these observations with those from our thermal decomposition studies of sideritic carbonates under a range of plausible geological heating scenarios. |
| File Size | 35346 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100024179 |
| Archival Resource Key | ark:/13960/t4zh1mk63 |
| Language | English |
| Publisher Date | 2010-01-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics High Resolution Pyroxenes Geology Thermal Decomposition Embedding Pulsed Lasers Heterogeneity Nanocrystals Magnetite Heating Chemical Composition Mars Surface Snc Meteorites X Ray Sources Carbon Dioxide Lasers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
