Released via the yankee Geophysical Union as a part of the Antarctic examine sequence, quantity 67.
A excessive amplitude magnetic anomaly happens over the Butcher Ridge igneous complicated within the Transantarctic Mountains. This sill-like physique is nearly 10 km lengthy the place uncovered. It levels from basalt to rhyolite in composition and has been advised as proof of a giant mafic intrusion at intensity. A unmarried NW-SE aeromagnetic profile flown throughout Butcher Ridge gave an 8-km-wide confident anomaly with maxima of approximately seven hundred and one thousand nT that are linked to topographic peaks that the plane cleared at approximately three hundred and six hundred m respectively. The saw amplitude of the Butcher Ridge anomaly is just too nice to be because of a standard sill of Ferrar Dolerite, examples of that are generally uncovered alongside the Transantarctic Mountains. versions that healthy the saw information point out magnetizations such as the Jurassic Dufek layered mafic intrusion within the Transantarctic Mountains close to the Weddell Sea. version calculations express that the higher, and such a lot magnetic a part of the inferred intrusion needs to be more than approximately 2 km thick and that the whole intrusion is perhaps considerably thicker. We interpret the resource of the Butcher Ridge magnetic anomaly to be a layered mafic intrusion, syntectonic with the Jurassic Transantarctic (failed) rift, marked via the Ferrar Dolerite. The magnetic proof for a buried mafic physique underneath the Butcher Ridge igneous advanced is the 1st proof of attainable Jurassic cumulate rocks within the Transantarctic Mountains bordering the Ross Embayment-Byrd Subglacial Basin.
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