TY - JOUR

T1 - Sulfide geochronology along the Northern Equatorial Mid-Atlantic Ridge

AU - Cherkashov, Georgy

AU - Kuznetsov, Vladislav

AU - Kuksa, Katherine

AU - Tabuns, Erik

AU - Maksimov, Fedor

AU - Bel'tenev, Victor

PY - 2017

Y1 - 2017

N2 - Hydrothermal processes and seafloor massive sulfide (SMS) deposits have different characteristics at fast and slow spreading mid-ocean ridges. One such parameter is the age of a SMS deposit, which differs by 1–2 orders of magnitude between the fast spreading East Pacific Rise (EPR) and the slow spreading Mid-Atlantic Ridge (MAR). The large collection of SMS samples dated from the 18 hydrothermal fields of the northern equatorial part of the Mid-Atlantic Ridge (194 samples) demonstrates a relatively old average age of hydrothermal fields here (~ 66 ka) with the oldest one estimated as ca. 223 ka (Peterburgskoye field). Based on geochronological data it was confirmed that hydrothermal discharge has an episodic character: active and inactive periods of the SMS formation alternate. The distribution of events at all hydrothermal fields demonstrates that maximum activity occurred at 38–35, 30–20, and 8–2 ka and increased with time. Based on statistical analyses, dating variations can be explained as a superposition

AB - Hydrothermal processes and seafloor massive sulfide (SMS) deposits have different characteristics at fast and slow spreading mid-ocean ridges. One such parameter is the age of a SMS deposit, which differs by 1–2 orders of magnitude between the fast spreading East Pacific Rise (EPR) and the slow spreading Mid-Atlantic Ridge (MAR). The large collection of SMS samples dated from the 18 hydrothermal fields of the northern equatorial part of the Mid-Atlantic Ridge (194 samples) demonstrates a relatively old average age of hydrothermal fields here (~ 66 ka) with the oldest one estimated as ca. 223 ka (Peterburgskoye field). Based on geochronological data it was confirmed that hydrothermal discharge has an episodic character: active and inactive periods of the SMS formation alternate. The distribution of events at all hydrothermal fields demonstrates that maximum activity occurred at 38–35, 30–20, and 8–2 ka and increased with time. Based on statistical analyses, dating variations can be explained as a superposition

U2 - 10.1016/j.oregeorev.2016.10.015

DO - 10.1016/j.oregeorev.2016.10.015

M3 - Article

VL - 87

SP - 147

EP - 154

JO - Ore Geology Reviews

JF - Ore Geology Reviews

SN - 0169-1368

ER -