Abstract
The 10 km-long Butcher Ridge was mapped on a scale of 1:5000; four sections were measured and 400 samples collected. An 40Ar/39Ar age shows the body to be 175 m.y. old. Lithologies are diverse and are described in detail: they include dolerite, massive andesite and rhyolite. The complex may represent mixing in a hypabyssal setting of a silicic magma derived from the melting of crustal rocks and a basaltic magma derived from the mantle. -G.R.M.
Original language | English (US) |
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Pages (from-to) | 54-55 |
Number of pages | 2 |
Journal | Antarctic Journal of the United States |
Volume | 16 |
Issue number | 5 |
State | Published - 1981 |
Externally published | Yes |
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)