Evidence for geochemical terranes on Mercury: Global mapping of major elements with MESSENGER's X-Ray Spectrometer

a Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA b Physics Department, The Catholic University of America, Washington, DC 20064, USA c Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, USA d Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA e The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA f Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA g Lunar and Planetary Institute, Universities Space Research Association, Houston, TX 77058, USA h Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH 44106, USA