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The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230 Th/U chronology and composition

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230 Th/U chronology and... Abstract 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 230 Th/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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geochronometria de Gruyter

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230 Th/U chronology and composition

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Publisher
de Gruyter
Copyright
Copyright © 2015 by the
eISSN
1897-1695
DOI
10.1515/geochr-2015-0009
Publisher site
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Abstract

Abstract 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 230 Th/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.

Journal

Geochronometria – de Gruyter

Published: May 22, 2015

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