Geochemical characteristics of sinking particles in the Tonga arc hydrothermal vent field, southwestern Pacific SCIE SCOPUS

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Title
Geochemical characteristics of sinking particles in the Tonga arc hydrothermal vent field, southwestern Pacific
Author(s)
Kim, Hyung Jeek; Kim, Jonguk; Pak, Sang Joon; Ju, Se Jong; Yoo, Chan Min; Kim, Hyun Sub; Lee, Kyeong Yong; Hwang, Jeomshik
KIOST Author(s)
Kim, Hyung Jeek(김형직)Kim, Jonguk(김종욱)Pak, Sang Joon(박상준)Yoo, Chan Min(유찬민)Kim, Hyun Sub(김현섭)
Publication Year
2016-10
Abstract
Studies of sinking particles associated with hydrothermal vent fluids may help us to quantify mass transformation processes between hydrothermal vent plumes and deposits. Such studies may also help us understand how various types of hydrothermal systems influence particle flux and composition. However, the nature of particle precipitation out of hydrothermal vent plumes in the volcanic arcs of convergent plate boundaries has not been well studied, nor have the characteristics of such particles been compared with the characteristics of sinking particles at divergent boundaries. We examined sinking particles collected by sediment traps for about 10 days at two sites, each within 200 m of identified hydrothermal vents in the south Tonga arc of the southwestern Pacific. The total mass flux was several-fold higher than in the non-hydrothermal southwest tropical Pacific. The contribution of non-biogenic materials was dominant (over 72%) and the contribution of metals such as Fe, Mn, Cu, and Zn was very high compared to their average levels in the upper continental crust. The particle flux and composition indicate that hydrothermal authigenic particles are the dominant source of the collected sinking particles. Overall, our elemental ratios are similar to observations of particles at the divergent plate boundary in the East Pacific Rise (EPR). Thus, the nature of the hydrothermal particles collected in the south Tonga arc is probably not drastically different from particles in the EPR region. However, we observed consistent differences between the two sites within the Tonga arc, in terms of the contribution of non-biogenic material, the radiocarbon content of sinking particulate organic carbon, the ratios of iron to other metals (e.g. Cu/Fe and Zn/Fe), and plume maturity indices (e.g. S/Fe). This heterogeneity within the Tonga arc is likely caused by differences in physical environment such as water depth, phase separation due to subcritical boiling and associated sub-seafloor precipitation. (C) 2016 Elsevier Ltd. All rights reserved.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1430
DOI
10.1016/j.dsr.2016.07.015
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.116, pp.118 - 126, 2016
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
LAU BACK-ARC; DE-FUCA RIDGE; SEA-FLOOR; METALLIFEROUS SEDIMENTS; ISOTOPIC COMPOSITION; SUBMARINE VOLCANO; KERMADEC ARC; MARIANA ARC; NEW-ZEALAND; RISE
Keywords
Hydrothermal vent systems; Tonga arc; Sinking particle flux; Trace metals; Sediment trap
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Particle flux,Carbon cycle,Climate Change,입자 플럭스,탄소순환,기후변화

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