Potential linkage between thermal degradation and mineral magnetic properties of Cu-rich chimneys in the Southwest Pacific

Title
Potential linkage between thermal degradation and mineral magnetic properties of Cu-rich chimneys in the Southwest Pacific
Author(s)
김원년; 문재운; 이경용
KIOST Author(s)
Kim, Wonnyon(김원년)Moon, Jai Woon(문재운)
Publication Year
2014-09-26
Abstract
Deep-sea hydrothermal vents (hereafter chimneys) are commonly found in the new crust forming divergent plate boundaries. Related to the chimney cycle from birth to death, it is hard to define the growth stage of the chimney due to a brief life span venting hydrothermal plume. Here we try to categorize the mineral magnetic properties of the chimneys according to their venting fluid-temperatures. Hydrothermal sulfide deposits in the Southwest Pacific were explored in 2012 and chimneys were collected using remotely operated vehicle (ROV) and Grab with AV camera (GTV). In the present study, mineral magnetic properties of three Cu-rich chimneys were measured: a high-temperature chimney showing a venting fluid-temperature of about 200°C (ROV01) a low-temperature chimney of about 80°C (GTV01) and an inactive chimney (ROV02). The chimneys were sliced to ~1 cm intervals from core to outer. Magnetic properties of ROV01 are dominated by pyrrhotite, except for the most outer that experienced severe oxidation. Concentration and grain-size of pyrrhotite are relatively low and fine. In the GTV01, pyrrhotite, dominant in the core, is gradually mixed with hematite toward the outer of the chimney due to secondary oxidation.ife span venting hydrothermal plume. Here we try to categorize the mineral magnetic properties of the chimneys according to their venting fluid-temperatures. Hydrothermal sulfide deposits in the Southwest Pacific were explored in 2012 and chimneys were collected using remotely operated vehicle (ROV) and Grab with AV camera (GTV). In the present study, mineral magnetic properties of three Cu-rich chimneys were measured: a high-temperature chimney showing a venting fluid-temperature of about 200°C (ROV01) a low-temperature chimney of about 80°C (GTV01) and an inactive chimney (ROV02). The chimneys were sliced to ~1 cm intervals from core to outer. Magnetic properties of ROV01 are dominated by pyrrhotite, except for the most outer that experienced severe oxidation. Concentration and grain-size of pyrrhotite are relatively low and fine. In the GTV01, pyrrhotite, dominant in the core, is gradually mixed with hematite toward the outer of the chimney due to secondary oxidation.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26017
Bibliographic Citation
Harvesting Seabed Minerals Resources in Harmony with Nature, pp.295 - 297, 2014
Publisher
UMI2014
Type
Conference
Language
English
Publisher
UMI2014
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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