BSE, FIB-TOF-SIMS and APT data of the interface between the Fe-rich and Mg-rich phases in TCI-like objects from lithology A. A) a BSE image of a TCI-like object surrounded by a FGR the green box shows where the FIB-TOF-SIMS maps were acquired from. B-E) FIB-TOF-SIMS maps showing SE, Ca, Mg and Na distributions respectively. Na is concentrated in the Fe-rich fibres and Ca is concentrated on the boundary between Fe and Mg -ich regions. F-G) TEM bright field images of TCI-like object rims and fibres panel G also has an inset SAED pattern. H) BSE image of a TCI-like object surrounded by a FGR, the red box indicates where APT samples were extracted from. I-J) APT datasets of the intergrowth of Fe and Mg-rich showing the distribution of Fe, Na, Mg and S atoms revealing that Fe and Mg-rich phases are intergrown at the nanoscale and Na is concentrated at the boundaries between phases. The dashed line highlights the boundary between the Fe and Mg-rich phases.
2D analysis of the preferred shape orientation of chondrules from SEM images of Winchcombe thin sections. A) P30552 (lithology A), B) P30542 (lithology B and fusion crust), C) P30545 (lithology B and Mx), D) P30424 (lithology B and Mx), E) P30423 (lithology C), F) P30541 (lithology D and Mx), G) P30548 (Lithology E). H) P30540 (lithology F, G and Mx). Chondrules and chondrule pseudomorphs are coloured blue, CAIs yellow and matrix grey. Lithological boundaries are marked in white lines and the boundary between areas affected by cracking from the fusion crust are demarked by red lines. The long shape axes of chondrules were plotted on a rose diagram and subdivided by lithology where multiple lithologies were present. Data show that most lithologies in the Winchcombe meteorite exhibit a preferred orientation of the long shape axes of chondrules.
EDS maps and BSE images of fi ne-grained minerals and materials within the Winchcombe meteorite. A) Low voltage (3 kV) EDS map of the matrix of lithology A, showing fi ne grained serpentines, fragments of TCI-like objects, and Ni-sulphides. B) BSE image of the matrix of lithology B revealing high-porosity and fi ne to coarse grained serpentine laths and sulphide grains (bright phases). Both the pores and serpentine laths have a preferred orientation with the long shape axis running top left to bottom right of the image. C) EDS map of schreibersite, daubréelite and pentlandite (Pn) within lithology A. D) EDS map of eskolaite and P-bearing sulphides within lithology F. E) EDS map of a refractory metal nugget within a sulphide grain within the matrix of lithology E. The RMN is multi- domain with Pt-rich and Os-rich regions. F) BSE image of fi ne-grained intergrowths of apatite (Ap) and pentlandite (Pn) within lithology F.
Fine-grained rims (FGRs) in Winchcombe lithology A. A) Bright-field TEM image and inset SAED patterns. In the image is a band of relatively coarsely crystalline phyllosilicate (with fibres extending from upper left to lower right) surrounded by more finely crystalline and porous phyllosilicate (pores are white). The left-hand side SAED pattern is from an area of the finely crystalline phyllosilicate and shows that the constituent crystals and small and randomly oriented. The most prominent ring has a d-spacing of 0.26 nm. The SAED pattern to its right is from the more coarsely crystalline band, and the two most prominent sectored rings have d-spacings of 0.35 and 0.25 nm. B) Bright-field TEM image showing an area of a different rim to (A) that also comprises patches of phyllosilicate that differ in crystal size. The finer grained phyllosilicate is again micropore-rich, and also contains a hollow organic nanoglobule. The vertical streaks are artefacts from FIB milling. C) Bright-field TEM image of the nanoglobule in (B), the exterior parts of which have been partially replaced by the phyllosilicate. D) BSE image of a fine-grained rim on a chondrule, the outer edge of which can be seen in the lower left. E) BSE image of the white boxed area in (D) showing an object 3 µm across that is an aggregate of sulphide and/or metal grains ~75–225 nm in size. F) HAADF STEM image of an amorphous silicate grain with embedded nano-sulphide/oxide that is enclosed in a nanoporous phyllosilicate groundmass. Most of the sulphide/oxide grains are euhedral, and ~100–800 nm in size, and are supported within an amorphous matrix. The crystal to the left of centre is a Fe,Ni sulphide.
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