First hydrothermal discoveries on the Australian‐Antarctic Ridge: Discharge sites, plume chemistry, and vent organisms

Hahm, Doshik; Baker, Edward T.; Siek Rhee, Tae; Won, Yong‐Jin; Resing, Joseph A.; Lupton, John E.; Lee, Won‐Kyung; Kim, Minjeong; Park, Sung‐Hyun

doi:10.1002/2015gc005926

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First hydrothermal discoveries on the Australian‐Antarctic Ridge: Discharge sites, plume chemistry, and vent organisms

2015
By Hahm, Doshik ; Baker, Edward T. ; Siek Rhee, Tae ; ...
Source: Geochemistry, Geophysics, Geosystems, 16(9), 3061-3075

[PDF-2.62 MB]

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Details:

Journal Title:

Geochemistry, Geophysics, Geosystems
Personal Author:

Hahm, Doshik ; Baker, Edward T. ; Siek Rhee, Tae ; Won, Yong‐Jin ; Resing, Joseph A. ; ... More +

Hahm, Doshik ; Baker, Edward T. ; Siek Rhee, Tae ; Won, Yong‐Jin ; Resing, Joseph A. ; Lupton, John E. ; Lee, Won‐Kyung ; Kim, Minjeong ; Park, Sung‐Hyun Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

The Australian‐Antarctic Ridge (AAR) is one of the largest unexplored regions of the global mid‐ocean ridge system. Here, we report a multiyear effort to locate and characterize hydrothermal activity on two first‐order segments of the AAR: KR1 and KR2. To locate vent sites on each segment, we used profiles collected by Miniature Autonomous Plume Recorders on rock corers during R/V Araon cruises in March and December of 2011. Optical and oxidation‐reduction‐potential anomalies indicate multiple active sites on both segments. Seven profiles on KR2 found 3 sites, each separated by ∼25 km. Forty profiles on KR1 identified 17 sites, some within a few kilometer of each other. The spatial density of hydrothermal activity along KR1 and KR2 (plume incidence of 0.34) is consistent with the global trend for a spreading rate of ∼70 mm/yr. The densest area of hydrothermal activity, named “Mujin,” occurred along the 20 km‐long inflated section near the segment center of KR1. Continuous plume surveys conducted in January–February of 2013 on R/V Araon found CH4/3He (1 − 15 × 106) and CH4/Mn (0.01–0.5) ratios in the plume samples, consistent with a basaltic‐hosted system and typical of ridges with intermediate spreading rates. Additionally, some of the plume samples exhibited slightly higher ratios of H2/3He and Fe/Mn than others, suggesting that those plumes are supported by a younger hydrothermal system that may have experienced a recent eruption. The Mujin‐field was populated by Kiwa crabs and seven‐armed Paulasterias starfish previously recorded on the East Scotia Ridge, raising the possibility of circum‐Antarctic biogeographic connections of vent fauna.
Keywords:

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Geochemistry And Petrology Geophysics
Source:

Geochemistry, Geophysics, Geosystems, 16(9), 3061-3075
DOI:

https://doi.org/10.1002/2015gc005926
ISSN:

1525-2027;1525-2027;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA10OAR4320148
Rights Information:

Other
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Library
Main Document Checksum:

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urn:sha256:38b754029885b0a341a502353c4575a538c4cad9355358771f9f5497eb88594f
Download URL:

https://repository.library.noaa.gov/view/noaa/59681/noaa_59681_DS1.pdf
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