FN Archimer Export Format
PT J
TI The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum
BT 
AF XIONG, Zhifang
   LI, Tiegang
   ALGEO, Thomas
   DOERING, Kristin
   FRANK, Martin
   BRZEZINSKI, Mark A.
   CHANG, Fengming
   OPFERGELT, Sophie
   CROSTA, Xavier
   JIANG, Fuqing
   WAN, Shiming
   ZHAI, Bin
AS 1:1;2:1;3:2,3,4;4:5,6;5:6;6:7,8;7:1;8:9;9:10;10:1;11:1;12:11;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao, Peoples R China.
   Univ Cincinnati, Dept Geol, Cincinnati, OH USA.
   China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China.
   China Univ Geosci, State Key Lab Geol Proc & Mineral Resource, Wuhan 430074, Peoples R China.
   Univ Kiel, Inst Geosci, Kiel, Germany.
   GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany.
   Univ Calif Santa Barbara, Marine Sci Inst, Santa Barbara, CA 93106 USA.
   Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA.
   Catholic Univ Louvain, Earth & Life Inst, Louvain La Neuve, Belgium.
   Univ Bordeaux, UMR CNRS EPOC 5805, Pessac, France.
   Minist Land & Resources, Qingdao Inst Marine Geol, Key Lab Marine Hydrocarbon Resource & Geol, Qingdao, Peoples R China.
C2 CHINESE ACAD SCI, CHINA
   UNIV CINCINNATI, USA
   CHINA UNIV GEOSCI, CHINA
   CHINA UNIV GEOSCI, CHINA
   UNIV KIEL, GERMANY
   GEOMAR HELMHOLTZ CTR OCEAN RES KIEL, GERMANY
   UNIV CALIF SANTA BARBARA, USA
   UNIV CALIF SANTA BARBARA, USA
   UNIV CATHOLIC LOUVAIN, BELGIUM
   UNIV BORDEAUX, FRANCE
   QNLM, CHINA
IF 3.433
TC 23
UR https://archimer.ifremer.fr/doc/00496/60732/65231.pdf
LA English
DT Article
CR MD 122 / WEPAMA
   MD 126 / MONA
   MD 130 / CADO
BO Marion Dufresne
AB The cause of massive blooms of Ethmodiscus rex laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS) during the Last Glacial Maximum (LGM) remains uncertain. In order to better understand the mechanism of formation of E. rex LDMs from the perspective of dissolved silicon (DSi) utilization, we determined the silicon isotopic composition of single E. rex diatom frustules (delta Si-30(E.rex)) from two sediment cores in the Parece Vela Basin of the EPS. In the study cores, delta Si-30(E.rex) varies from -1.23 parts per thousand to -0.83 parts per thousand (average -1.04 parts per thousand), a range that is atypical of marine diatom delta Si-30 and that corresponds to the lower limit of reported diatom delta Si-30 values of any age. A binary mixing model (upwelled silicon versus eolian silicon) accounting for silicon isotopic fractionation during DSi uptake by diatoms was constructed. The binary mixing model demonstrates that E. rex dominantly utilized DSi from eolian sources (i.e., Asian dust) with only minor contributions from upwelled seawater sources (i.e., advected from Subantarctic Mode Water, Antarctic Intermediate Water, or North Pacific Intermediate Water). E. rex utilized only similar to 24% of available DSi, indicating that surface waters of the EPS were eutrophic with respect to silicon during the LGM. Our results suggest that giant diatoms did not always use a buoyancy strategy to obtain nutrients from the deep nutrient pool, thus revising previously proposed models for the formation of E. rex LDMs. 
PY 2015
PD JUN
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 30
IS 7
UT 000360058100001
BP 803
EP 823
DI 10.1002/2015PA002793
ID 60732
ER

EF