Extraterrestrial He in Sediments: From Recorder of Asteroid Collisions to Timekeeper of Global Environmental Changes

@inproceedings{McGee2013ExtraterrestrialHI,
  title={Extraterrestrial He in Sediments: From Recorder of Asteroid Collisions to Timekeeper of Global Environmental Changes},
  author={David McGee and Sharmistha Mukhopadhyay},
  year={2013}
}
Most 3He in deep-sea sediments is derived from fine-grained extraterrestrial matter known as interplanetary dust particles (IDPs). These particles, typically <50 μm in diameter, are sufficiently small to retain solar wind-implanted He with high 3He/4He ratios during atmospheric entry heating. This extraterrestrial 3He (3HeET) is retained in sediments for geologically long durations, having been detected in sedimentary rocks as old as 480 Ma. As a tracer of fine-grained extraterrestrial material… CONTINUE READING

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