From April 10 to June 10, 2017, I will be taking part in IODP Expedition 368 - South China Sea, off the coast of China.
Friday, May 12, 2017
chilled margin ...
The square-shaped piece is a fragment of a basaltic chilled margin, ripped from a previous location and transported in a new batch of magma. This happens when a magma is rapidly cooled and chilled, it becomes "frozen" in a somewhat glassy state.