Today is absolutely gorgeous, so I wandered up to take advantage of the crystal clear skies & great views. Where am I?
Wednesday Wanderings
17. April, 2013 by Elli Goeke
Posted in Uncategorized | Tagged geology, travel | 2 Comments
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M = mathematician, moved to Japan for a brilliant post-doc; on to visit list!
OC = orchestral conductor, brother, lives in DC area
PE = project engineer, dad, providing reasons to visit India & Australia this yearquick things
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Halibut Point Quarry, Cape Ann Granite, type locality of annite, the Fe end-member of the biotite solid solution series (phlogopite being the Mg end-member), if I’m not mistaken. The UW-Madison Unstable Isotope Lab used zircon from in or near this quarry as an internal lab U/Pb standard for Paleozoic age determinations when I was a grad student there.
As usual, Ron is right 🙂 The type locality for annite, though is not up in the Halibut Point quarry, but down along the ocean further to the east.