Extended Data Fig. 4: The secondary modification of Kama’ehuakanaloa (formerly Lō‘ihi) samples.
From: Potassium-40 isotopic evidence for an extant pre-giant-impact component of Earth’s mantle
Elevated 234U/238U and 86Sr/87Sr ratios indicate seawater alteration and contamination with hydrothermally altered rocks, respectively. The most pristine sample 6K491-2 shows a resolvable K isotopic anomaly. In contrast, samples 1804-1 and 1803-16 do not show resolvable K isotopic anomalies, which may reflect the overprint of the original mantle K during alteration and crustal contamination. Data source52.
