Biogenic silica fluxes and accumulation rates in the Gulf of California

The Gulf of California, though small in size, plays an important role in the global silica cycle. The seasonal pattern of biogenic silica flux in the gulf is closely related to that of phytoplankton biomass levels and is controlled by changes in weather and hydrographic conditions. The highest opal...

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Bibliographic Details
Published in:Geology (Boulder) 1994-04, Vol.22 (4), p.303-306
Main Authors: Thunell, Robert C, Pride, Carol J, Tappa, Eric, Muller-Karger, Frank E
Format: Article
Language:English
Subjects:
Carmen Basin
climate
controls
depositional environment
East Pacific
ecosystems
framework silicates
Geology
Guaymas Basin
Gulf of California
Marine
marine sediments
North American Pacific
North Pacific
Northeast Pacific
Oceanography
opal
Pacific Ocean
sampling
sea water
seasonal variations
sediments
silica
silica minerals
silicates
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Summary:The Gulf of California, though small in size, plays an important role in the global silica cycle. The seasonal pattern of biogenic silica flux in the gulf is closely related to that of phytoplankton biomass levels and is controlled by changes in weather and hydrographic conditions. The highest opal fluxes (∼0.35 g·m-2·d-1) occur during winter and spring, and they are comparable to those measured in some of the most productive ecosystems of the world. Approximately 15%-25% of the biogenic silica produced in surface waters is preserved in gulf sediments, a figure significantly higher than the average global ocean preservation rate. However, the flux of opal at 500 m water depth is less than 25% of that being produced at the surface, suggesting that most of the recycling of biogenic silica in the Gulf of California occurs in the upper water column.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(1994)022<0303:BSFAAR>2.3.CO;2