Relating observations in China to IOASs
On a field excursion to China, a Boninite sequence was the only surviving relict observed that could indicate an IOAS.
The observed Boninite sequence included;
• Pillow basalts – strongly flattened/elongated pillows,
amygdules ( Amygdules indicate high temperature melting or an influx of fluids)
• Gabbroic dykes (with a lack of pillow texture)
•Massive gabbro and
dolerite
Figure 1: Petrological map
and cross‐section of Dachadaban boninite sequence (Stop 3) (From the Guide book for Asia Pacific Field School, 2013).
The observed Boninite sequence included;
• Pillow basalts – strongly flattened/elongated pillows,
amygdules ( Amygdules indicate high temperature melting or an influx of fluids)
• Gabbroic dykes (with a lack of pillow texture)
•Massive gabbro and
dolerite
Figure 1: Petrological map
and cross‐section of Dachadaban boninite sequence (Stop 3) (From the Guide book for Asia Pacific Field School, 2013).