Volcanic triggering of a biogeochemical cascade during Oceanic Anoxic Event 2

被引:164
作者
Adams, Derek D. [1 ]
Hurtgen, Matthew T. [1 ]
Sageman, Bradley B. [1 ]
机构
[1] Northwestern Univ, Evanston, IL 60208 USA
关键词
BLACK SHALE; PHOSPHORUS; CARBON; DEPOSITION;
D O I
10.1038/NGEO743
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
During the Cretaceous period (similar to 145-65 million years ago), there were several periods of global ocean anoxia, each lasting less than one million years. These events, known as ocean anoxic events, were marked by significant increases in organic carbon burial(1), and are generally attributed to increased primary productivity in surface waters(2). The details underpinning the initiation, maintenance and termination of these events, however, remain equivocal. Here we present sulphur isotope data spanning the Ocean Anoxic Event 2 (about 94.5 million years ago) from sedimentary rocks in Colorado that were formed in the Western Interior Seaway; this seaway ran north-south, splitting North America during the Cretaceous. Sulphate levels increased rapidly from relatively low background levels at the onset of the event, most likely from the release of sulphur by massive volcanism, and fell during the anoxic event. We infer that the input of sulphate facilitated increased carbon remineralization, which enhanced nutrient recycling and increased global primary productivity, eventually resulting in widespread ocean anoxia. Our scenario indicates that Ocean Anoxic Event 2 may have persisted until sulphate levels were stabilized by the formation and burial of the sulphur mineral pyrite, which returned primary productivity to background levels. We suggest that fluctuations in sulphate levels may have regulated the marine carbon cycle during past periods of low oceanic sulphate concentration.
引用
收藏
页码:201 / 204
页数:4
相关论文
共 31 条
[1]  
Arthur M.A., 2000, ENCY VOLCANOES
[2]  
Arthur M.A., 1985, The carbon cycle and atmospheric CO2: Natural variations Archean to present, V32, P504, DOI DOI 10.1029/GM032P0504
[3]   THE DEPENDENCE OF BACTERIAL SULFATE REDUCTION ON SULFATE CONCENTRATION IN MARINE-SEDIMENTS [J].
BOUDREAU, BP ;
WESTRICH, JT .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1984, 48 (12) :2503-2516
[4]   10 METER GLOBAL SEA-LEVEL CHANGE ASSOCIATED WITH SOUTH-ATLANTIC APTIAN SALT DEPOSITION [J].
BURKE, K ;
SENGOR, AMC .
MARINE GEOLOGY, 1988, 83 (1-4) :309-312
[5]   Isotope fractionation by natural populations of sulfate-reducing bacteria [J].
Canfield, DE .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2001, 65 (07) :1117-1124
[6]   SULFATE CONTROL OF PHOSPHORUS AVAILABILITY IN LAKES - A TEST AND REEVALUATION OF HASLER AND EINSELE MODEL [J].
CARACO, NF ;
COLE, JJ ;
LIKENS, GE .
HYDROBIOLOGIA, 1993, 253 (1-3) :275-280
[7]   EVIDENCE FOR SULFATE-CONTROLLED PHOSPHORUS RELEASE FROM SEDIMENTS OF AQUATIC SYSTEMS [J].
CARACO, NF ;
COLE, JJ ;
LIKENS, GE .
NATURE, 1989, 341 (6240) :316-318
[8]   IRON-SULFUR-CARBON RELATIONSHIPS IN ORGANIC-CARBON-RICH SEQUENCES .1. - CRETACEOUS WESTERN INTERIOR SEAWAY [J].
DEAN, WE ;
ARTHUR, MA .
AMERICAN JOURNAL OF SCIENCE, 1989, 289 (06) :708-743
[9]   Calibration of sulfate levels in the Archean Ocean [J].
Habicht, KS ;
Gade, M ;
Thamdrup, B ;
Berg, P ;
Canfield, DE .
SCIENCE, 2002, 298 (5602) :2372-2374
[10]   Cretaceous and cenozoic evolution of seawater composition, atmospheric O2 and CO2:: A model perspective [J].
Hansen, KW ;
Wallmann, K .
AMERICAN JOURNAL OF SCIENCE, 2003, 303 (02) :94-148