Volcano's Burps and Sighs Could Warn of Eruptions
Watching how gas escapes from a volcano - from slow sighs to big burps - can warn of coming eruptions, according to a study published Sept.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Sep 11, 2013
There are fossil bubble walls in outcrop near the Youth Hostel on the Pen Caer Peninsula S. of strumble head in Pembrokeshire S. Wales.
The rhyodacite intrusion that was partly removed by eruption gavce rise to rhyodacite pillow lavas in outcrop closer to strumble head (further N.) and also a number of rhyodacite block & ash flow channelised beds from a dome complex probably closer to sea level than the pillow lavas.
For the record a YOUNGER volcanic series in the developing welsh backarc basin produced gabbroic sills cutting the rhyodacite and surrounded & buried the rhyodacites under basaltic pillow lavas in at least 2 pillow lava series separated by a fair chunk of time. The uppermost of the lower pillow lava series became rather large and approx andesite in composition as a result of differentiation, before eventually becoming andesite block lava flows down a distinct submarine slope covered by a shale drape.
The 2nd series of pillow lavas erupted on top of these flows and were eventually intruded by gabbroic sills downslope forming the gabbro intrusions @ strumble head. The pillow lavas from the 2nd series are found in the surrounds of Strumble head as are also some impressive avalanche type turbidites down the slope now further S. than the outcrops.
Worth a look over if you are staying @ the Hostel. The rhyodacite intrusives are a pale-mid slightly greenish grey (epidotised), the Rhyodacite pillow lavas are by contrast a mid blue grey and have rather rubbly rinds and are found close to sea level and overwashed by storm waves with the surrounding younger basalt pillows further up the rocky slope and the coast path itself. They are just S. of a prominent cape island called Pen Brush. At least one person has been rescued by the coastguard from "Pen Brush" cape island (!).
Have a nice day: Ag
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