The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230Th/U chronology and composition
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St. Petersburg State University, V.O., 10-th Line 33/35, 199178, St. Petersburg, Russia
Institute for Geology and Mineral Resources of the Ocean (VNIIOkeangeologia), Angliysky Prospect 1, 190121, St. Petersburg, Russia
Polar Marine Geosurvey Expedition, Pobedy Str. 24, 198412 Lomonosov, St. Petersburg, Russia
Submission date: 2014-03-25
Acceptance date: 2015-02-01
Online publication date: 2015-05-22
Geochronometria 2015;42(1):100-106
A geochronological and geochemical study on 10 samples of seafloor massive sulfides (SMS) from the inactive Peterburgskoye hydrothermal field at the Mid-Atlantic Ridge (MAR) was carried out. The 230Th/U ages of the SMS are the oldest for the Quaternary hydrothermal ores ever found at the ocean floor. According to them the hydrothermal activity at Peterburgskoye field started at least 170 ka and continued down to 63 ka. The oldest hydrothermal ores from this field consist mainly of pyrite and chalcopyrite and have geochemical properties typical for SMS associated with basalts.
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