Robert G Spencer, Florida State University, Department of Earth, Ocean and Atmospheric Sciences, Tallahassee, FL, United States, Jose Mauro Sousa Moura, Federal University of Para, ParĂ¡, Brazil, Miyuki Mitsuya, Federal University of Western Para, Santarem, Brazil, Bernhard Peucker-Ehrenbrink, Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States, Robert Max Holmes, Woods Hole Research Center, Falmouth, MA, United States, Valier Galy, WHOI, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States and Travis Drake, Florida State University, Earth Ocean and Atmospheric Science, Tallahassee, FL, United States