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Biogeochemistry of basement fluids f...

Lin, Huei-Ting.

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Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks./
Author:	Lin, Huei-Ting.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2013,
Description:	267 p.
Notes:	Source: Dissertations Abstracts International, Volume: 75-07, Section: B.
Contained By:	Dissertations Abstracts International75-07B.
Subject:	Chemical Oceanography. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3577256
ISBN:	9781303590054

Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks.
Lin, Huei-Ting.

Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks. - Ann Arbor : ProQuest Dissertations & Theses, 2013 - 267 p.

Source: Dissertations Abstracts International, Volume: 75-07, Section: B.

Thesis (Ph.D.)--University of Hawai'i at Manoa, 2013.

This item is not available from ProQuest Dissertations & Theses.

The most in depth examination to date of the biogeochemistry of oceanic basement fluids is provided for the sediment-buried Juan de Fuca Ridge flank with a crustal age of 3.5 Ma. The overall goals of this study are to understand the available nutrients, substrates and geochemical energy for the sediment-buried ridge-flank basement biosphere and to evaluate the impact that the ridge-flank hydrothermal system may have on the global ocean organic carbon cycle. Tremendous efforts were made to obtain high quality ridgeflank basement fluid samples by developing a novel clean sampling system to obtain fluids via delivery lines associated with Circulation Obviation Retrofit Kit (CORK) observatories installed in Integrated Ocean Drilling Program (IODP) boreholes 1301A, 1362A and 1362B. The low phosphate concentrations (0.06-0.1 μM) in ridge-flank basement fluids, relative to dissolved inorganic carbon (0.46-0.59 μM) and ammonium (99-102 μM) suggest that phosphate could be a limiting major nutrient in the basement biosphere. Both methane (1.5-13μM) and hydrogen (0.05-2 μM) are present at significantly higher concentrations in ridge-flank basement fluids than in background seawater (0.0002 and 0.0004 μM, respectively), providing energy for methanotrophs and hydrogenotrophic microorganisms. The δ 13C-CH4 values for CORK 1301A fluids (-42 ± 2 ‰, n=4) fall within the range of isotopic values for thermogenic (-20‰ to -62‰) and near the 13C enriched compositions of biogenic (-110‰ to -45‰) methane. The low dissolved organic carbon (DOC) concentrations in the ridge-flank basement fluids (11-16 μM) confirm that the basement is a net sink for deep seawater DOC (~40 μM). However, the elevated dissolved amino acids concentrations (53-89 nM) suggest that ridge-flank basement fluid is a net source for deep seawater amino acids (~50 nM) and that amino acids may be utilized by heterotrophic microorganisms in the basement environment. In addition, significant differences in concentrations of dissolved methane, hydrogen and amino acids in basement fluids collected from the three study sites indicate that the aquifer is heterogeneous on at the scale of hundreds of meters, suggesting that variable microbial community compositions and/or different microbial activities may be found at the three sites.

ISBN: 9781303590054Subjects--Topical Terms:

1674678
Chemical Oceanography.
Subjects--Index Terms:

Basement

Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks.
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245 1 0 $a Biogeochemistry of basement fluids from the sediment-buried Juan de Fuca Ridge flanks.
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300 $a 267 p.
500 $a Source: Dissertations Abstracts International, Volume: 75-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Cowen, James P.
502 $a Thesis (Ph.D.)--University of Hawai'i at Manoa, 2013.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a The most in depth examination to date of the biogeochemistry of oceanic basement fluids is provided for the sediment-buried Juan de Fuca Ridge flank with a crustal age of 3.5 Ma. The overall goals of this study are to understand the available nutrients, substrates and geochemical energy for the sediment-buried ridge-flank basement biosphere and to evaluate the impact that the ridge-flank hydrothermal system may have on the global ocean organic carbon cycle. Tremendous efforts were made to obtain high quality ridgeflank basement fluid samples by developing a novel clean sampling system to obtain fluids via delivery lines associated with Circulation Obviation Retrofit Kit (CORK) observatories installed in Integrated Ocean Drilling Program (IODP) boreholes 1301A, 1362A and 1362B. The low phosphate concentrations (0.06-0.1 μM) in ridge-flank basement fluids, relative to dissolved inorganic carbon (0.46-0.59 μM) and ammonium (99-102 μM) suggest that phosphate could be a limiting major nutrient in the basement biosphere. Both methane (1.5-13μM) and hydrogen (0.05-2 μM) are present at significantly higher concentrations in ridge-flank basement fluids than in background seawater (0.0002 and 0.0004 μM, respectively), providing energy for methanotrophs and hydrogenotrophic microorganisms. The δ 13C-CH4 values for CORK 1301A fluids (-42 ± 2 ‰, n=4) fall within the range of isotopic values for thermogenic (-20‰ to -62‰) and near the 13C enriched compositions of biogenic (-110‰ to -45‰) methane. The low dissolved organic carbon (DOC) concentrations in the ridge-flank basement fluids (11-16 μM) confirm that the basement is a net sink for deep seawater DOC (~40 μM). However, the elevated dissolved amino acids concentrations (53-89 nM) suggest that ridge-flank basement fluid is a net source for deep seawater amino acids (~50 nM) and that amino acids may be utilized by heterotrophic microorganisms in the basement environment. In addition, significant differences in concentrations of dissolved methane, hydrogen and amino acids in basement fluids collected from the three study sites indicate that the aquifer is heterogeneous on at the scale of hundreds of meters, suggesting that variable microbial community compositions and/or different microbial activities may be found at the three sites.
590 $a School code: 0085.
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650 4 $a Biogeochemistry. $3 545717
650 4 $a Marine Geology. $3 1674685
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653 $a Hydrothermal fluids
653 $a Juan de Fuca Ridge
653 $a Mid-ocean ridges
653 $a Oceanic crust
653 $a Sediment burial
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710 2 $a University of Hawai'i at Manoa. $3 1017511
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856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3577256