1936 <p>I wish to present what evidence we have as to the geochemistry of boron minerals as related to volcanological processes, or, in other words, what are the volcanological boron compounds?</p><p>Volcanological processes, considered only as they apply to this question, may be grouped for present convenience as follows: (1) Extrusion of volcanic rocks; (2) volcanic exhalations including fumaroles and solfataras; (3) hot springs.</p> application/pdf 10.1029/TR017i001p00234 en American Geophysical Union Volcanological boron compounds article