How did Earth avoid a Mars-like fate? Ancient rocks hold clues UofR NatureComms
W), and Site 4 . Additional large unoriented samples were collected adjacent to the oriented samples to ensure sufficient material far from the influence of weathering was available for study. Outcrops were scanned with a Brunton compass to test for the presence of lightning strikes . Samples for-T measurements were obtained by crushing subsamples into a powder using non-magnetic tools, whereas those for magnetic hysteresis were mm-sized chips. For directional studies, 2.
data were collected on single crystals as follows: Each s; the saturation field was 1 T, with a field increment of 10 or 12 mT, and an averaging time of 250 ms was used;from −0.5 to 0.1 T.
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