FN Archimer Export Format
PT J
TI Seawater‐Fluid Composition Records From Molybdenum Isotopes of Sequentially Extracted Phases of Seep Carbonate Rocks
BT 
AF Jia, Zice
   Hu, Yu
   Bayon, Germain
   Peckmann, Jörn
   Wang, Xudong
   Gong, Shanggui
   Li, Jie
   Roberts, Harry H.
   Chen, Duofu
   Feng, Dong
AS 1:1,2;2:1;3:3;4:4;5:1;6:1;7:5;8:6;9:1,2;10:1,2;
FF 1:;2:;3:PDG-REM-GEOOCEAN-ASTRE;4:;5:;6:;7:;8:;9:;10:;
C1 College of Marine Sciences Shanghai Ocean University Shanghai ,China
   Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao ,China
   CNRS Ifremer Geo‐Ocean University of Brest Plouzané,France
   Institute for Geology Center for Earth System Research and Sustainability Universität Hamburg Hamburg ,Germany
   State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou ,China
   Coastal Studies Institute College of the Coastal and Environment Louisiana State University Baton Rouge LA, USA
C2 UNIV SHANGHAI OCEAN, CHINA
   QNLM, CHINA
   IFREMER, FRANCE
   UNIV HAMBURG, GERMANY
   CHINESE ACAD SCI, CHINA
   UNIV LOUISIANA STATE, USA
SI BREST
SE PDG-REM-GEOOCEAN-ASTRE
UM GEO-OCEAN
IN WOS Ifremer UMR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 3.5
TC 2
UR https://archimer.ifremer.fr/doc/00866/97742/106626.pdf
   https://archimer.ifremer.fr/doc/00866/97742/106627.pdf
LA English
DT Article
DE ;seep carbonate;early diagenesis;molybdenum isotopes;sequential chemical extraction
AB Authigenic molybdenum (Moauth) in marine sediments holds great potential to archive the Mo isotopic composition of seawater and biogeochemical processes. However, the factors that control authigenic Mo isotope (δ98Moauth) distribution patterns remain poorly constrained. Here, we report Mo abundances and δ98Mo compositions for bulk‐rock (bulk) and sequentially extracted fractions—including total authigenic (auth; i.e., non‐lithogenic fraction), carbonate (carb), iron and manganese oxyhydroxides, pyrite (py), and organic fractions (OM)—of authigenic carbonates recovered from various hydrocarbon seep sites in the Gulf of Mexico and the South China Sea. Extracted pyrite fractions exhibit Mo contents varying from 0.1 to 23.4 μg/g and generally dominate the Mo budget of seep carbonate rocks. Our data indicate large ranges of δ98Mobulk and δ98Moauth values relative to NIST 3134 (0.25‰), varying from 1.02 to 1.98‰ (n = 4) and from 0.15 to 3.07‰ (n = 34), respectively. The difference in δ98Mo values between carbonate and pyrite fractions of seep carbonate rocks formed under sulfidic conditions increases with higher Moauth contents, suggesting a control of dissolved hydrogen sulfide concentrations on Mo isotope fractionation during carbonate precipitation. Compared with δ98Moauth and δ98Mopy, δ98Mocarb of seep carbonate rocks formed under sulfidic conditions shows a relatively narrow range with an average of 1.98 ± 0.31‰ (1 SD; n = 10), providing constraints on the δ98Mo composition of seawater in the course of Earth history. Overall, our findings show that the δ98Mo composition of sequentially extracted phases of carbonate‐rich sedimentary rocks can provide insights into seawater‐sediment interactions and biogeochemical pathways of Mo during early diagenesis. 
PY 2023
PD DEC
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU American Geophysical Union (AGU)
VL 24
IS 12
UT 001114024800001
DI 10.1029/2023GC011128
ID 97742
ER

EF