Wednesday, September 30, 2015

Geosonnet 35



The bluestone of which Melbourne is constructed
Is fresh basalt, from NVP derived
And yet no ocean slab is here subducted
No spreading ridge or hotspot has survived
With late Cretaceous Antarctic divorce
The margin should be passive, fires spent
And yet there must be an upwelling force
As mantle melting is quite evident.
Cratonic root plows through Asthenosphere
The slowest ship to ever voyage north
Yet models show convection will appear
So decompression melts can issue forth.
  Melb's gloomy architecture isn't fake
  The town's built from Australia's stony wake.



Other geosonnets: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

No comments: