The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230Th/U chronology and composition-Reference-Cited by-同舟云学术

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

Published:2015-05-22 Issue:1 Volume:42 Page:
ISSN:1897-1695
Container-title:Geochronometria
language:en
Short-container-title:

Author:

Kuznetsov Vladislav¹,Tabuns Eriks¹,Kuksa Kathrine¹,Cherkashov Georgy¹²,Maksimov Fedor¹,Bel’Tenev Viktor³,Lazareva Larisa³,Zherebtsov Igor¹,Grigoriev Vasily¹,Baranova Nadezhda¹

Affiliation:

1. St. Petersburg State University, V.O., 10-th Line 33/35, 199178, St. Petersburg, Russia

2. Institute for Geology and Mineral Resources of the Ocean (VNIIOkeangeologia), Angliysky Prospect 1, 190121, St. Petersburg, Russia

3. Polar Marine Geosurvey Expedition, Pobedy Str. 24, 198412 Lomonosov, St. Petersburg, Russia

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 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.

Publisher

Walter de Gruyter GmbH

Subject

Earth and Planetary Sciences (miscellaneous)

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