Stable isotopes, Sr/Ca, and Mg/Ca in biogenic carbonates from Petaluma Marsh, northern California, USA
Stable isotope ( 18O/ 16O and 13C/ 12C) and minor-element compositions (Sr/Ca and Mg/Ca ratios) of ostracodes and gastropods separated from marsh sediments from San Francisco Bay, Northern California, were used to reconstruct paleoenvironmental changes in Petaluma Marsh over the past 700 yr. The val...
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| Veröffentlicht in: | Geochimica et Cosmochimica Acta 1998-10, Vol.62 (19), p.3229-3237 |
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| container_title | Geochimica et Cosmochimica Acta |
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| creator | Ingram, B.L. De Deckker, P. Chivas, A.R. Conrad, M.E. Byrne, A.R. |
| description | Stable isotope (
18O/
16O and
13C/
12C) and minor-element compositions (Sr/Ca and Mg/Ca ratios) of ostracodes and gastropods separated from marsh sediments from San Francisco Bay, Northern California, were used to reconstruct paleoenvironmental changes in Petaluma Marsh over the past 700 yr. The value of δ
18O in the marsh carbonates reflects changes in freshwater inflow, evaporation, and temperature. Mg/Ca and Sr/Ca in ostracode calcite reflect changes in both freshwater inflow and temperature, although primarily reflect temperature changes in the salinity range of about 10–35‰. Ostracode δ
18O values show a gradual increase by 5‰ between 500 yr
BP and the present, probably reflecting rising sea level and increased evaporation in the marsh. Superimposed on this trend are higher frequency Mg/Ca and δ
18O variations (3–4‰), probably reflecting changes in freshwater inflow and evaporation. A period of low Mg/Ca occurred between about 100–300 cal yr
BP, suggesting wetter and cooler conditions during the Little Ice Age. Higher Mg/Ca ratios occurred 600–700 cal yr
BP, indicating drier and warmer conditions during the end of the Medieval Warm Period. Both ostracode and gastropod δ
13C values decrease up-core, reflecting decomposition of marsh vegetation, which changes from C
4 (δ
13C ∼ −12‰) to CAM (δ
13C = −26‰)-type vegetation over time. |
| doi_str_mv | 10.1016/S0016-7037(98)00240-3 |
| format | Article |
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18O/
16O and
13C/
12C) and minor-element compositions (Sr/Ca and Mg/Ca ratios) of ostracodes and gastropods separated from marsh sediments from San Francisco Bay, Northern California, were used to reconstruct paleoenvironmental changes in Petaluma Marsh over the past 700 yr. The value of δ
18O in the marsh carbonates reflects changes in freshwater inflow, evaporation, and temperature. Mg/Ca and Sr/Ca in ostracode calcite reflect changes in both freshwater inflow and temperature, although primarily reflect temperature changes in the salinity range of about 10–35‰. Ostracode δ
18O values show a gradual increase by 5‰ between 500 yr
BP and the present, probably reflecting rising sea level and increased evaporation in the marsh. Superimposed on this trend are higher frequency Mg/Ca and δ
18O variations (3–4‰), probably reflecting changes in freshwater inflow and evaporation. A period of low Mg/Ca occurred between about 100–300 cal yr
BP, suggesting wetter and cooler conditions during the Little Ice Age. Higher Mg/Ca ratios occurred 600–700 cal yr
BP, indicating drier and warmer conditions during the end of the Medieval Warm Period. Both ostracode and gastropod δ
13C values decrease up-core, reflecting decomposition of marsh vegetation, which changes from C
4 (δ
13C ∼ −12‰) to CAM (δ
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18O/
16O and
13C/
12C) and minor-element compositions (Sr/Ca and Mg/Ca ratios) of ostracodes and gastropods separated from marsh sediments from San Francisco Bay, Northern California, were used to reconstruct paleoenvironmental changes in Petaluma Marsh over the past 700 yr. The value of δ
18O in the marsh carbonates reflects changes in freshwater inflow, evaporation, and temperature. Mg/Ca and Sr/Ca in ostracode calcite reflect changes in both freshwater inflow and temperature, although primarily reflect temperature changes in the salinity range of about 10–35‰. Ostracode δ
18O values show a gradual increase by 5‰ between 500 yr
BP and the present, probably reflecting rising sea level and increased evaporation in the marsh. Superimposed on this trend are higher frequency Mg/Ca and δ
18O variations (3–4‰), probably reflecting changes in freshwater inflow and evaporation. A period of low Mg/Ca occurred between about 100–300 cal yr
BP, suggesting wetter and cooler conditions during the Little Ice Age. Higher Mg/Ca ratios occurred 600–700 cal yr
BP, indicating drier and warmer conditions during the end of the Medieval Warm Period. Both ostracode and gastropod δ
13C values decrease up-core, reflecting decomposition of marsh vegetation, which changes from C
4 (δ
13C ∼ −12‰) to CAM (δ
13C = −26‰)-type vegetation over time.</description><subject>AQUATIC ORGANISMS</subject><subject>CALIFORNIA</subject><subject>CLIMATIC CHANGE</subject><subject>ENVIRONMENTAL SCIENCES</subject><subject>Freshwater</subject><subject>Gastropoda</subject><subject>GEOSCIENCES</subject><subject>ISOTOPE RATIO</subject><subject>MARSHES</subject><subject>PALEOCLIMATOLOGY</subject><subject>SEA LEVEL</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqFkN9LIzEQx4MoWKt_wkF8EYXumew2P_ZJSjn1QDmh53OYzc7ayDapSSrcf3-7Vnz1ZWZgPvOdmS8hPzj7yRmX1ys2xEKxSl3W-oqxcs6K6oBMuFZlUYuqOiSTL-SYnKT0yhhTQrAJ6VYZmh6pSyGHLaYZXcXrJcwo-JY-vgwldZ42Lrygd5ZaiE3wkDHRLoYNfcIM_W4D9BFiWs-oDzGvMXq6hN51IXo3SD2vFqfkqIM-4dlnnpLn219_l_fFw5-738vFQwGCsVzIGhUHLepSWuSCqVLotoSa27ngVS1l2YCQstKlEvOyaVoQSutONw0o6IbGlJzvdUPKziTrMtq1Dd6jzaaqtOR8YC72zDaGtx2mbDYuWex78Bh2yXDNuJ7LERR70MaQUsTObKPbQPxnODOj8-bDeTPaamptPpwftkzJzX4Oh0_fHcbxEPQWWxfHO9rgvlH4DyDJiFA</recordid><startdate>19981001</startdate><enddate>19981001</enddate><creator>Ingram, B.L.</creator><creator>De Deckker, P.</creator><creator>Chivas, A.R.</creator><creator>Conrad, M.E.</creator><creator>Byrne, A.R.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>F1W</scope><scope>H95</scope><scope>H96</scope><scope>L.G</scope><scope>OTOTI</scope></search><sort><creationdate>19981001</creationdate><title>Stable isotopes, Sr/Ca, and Mg/Ca in biogenic carbonates from Petaluma Marsh, northern California, USA</title><author>Ingram, B.L. ; De Deckker, P. ; Chivas, A.R. ; Conrad, M.E. ; Byrne, A.R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a500t-69e71a85926ce1507258d2a91c45139662ba5663827542bbda5788f8bba7af663</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>AQUATIC ORGANISMS</topic><topic>CALIFORNIA</topic><topic>CLIMATIC CHANGE</topic><topic>ENVIRONMENTAL SCIENCES</topic><topic>Freshwater</topic><topic>Gastropoda</topic><topic>GEOSCIENCES</topic><topic>ISOTOPE RATIO</topic><topic>MARSHES</topic><topic>PALEOCLIMATOLOGY</topic><topic>SEA LEVEL</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ingram, B.L.</creatorcontrib><creatorcontrib>De Deckker, P.</creatorcontrib><creatorcontrib>Chivas, A.R.</creatorcontrib><creatorcontrib>Conrad, M.E.</creatorcontrib><creatorcontrib>Byrne, A.R.</creatorcontrib><collection>CrossRef</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>OSTI.GOV</collection><jtitle>Geochimica et Cosmochimica Acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ingram, B.L.</au><au>De Deckker, P.</au><au>Chivas, A.R.</au><au>Conrad, M.E.</au><au>Byrne, A.R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stable isotopes, Sr/Ca, and Mg/Ca in biogenic carbonates from Petaluma Marsh, northern California, USA</atitle><jtitle>Geochimica et Cosmochimica Acta</jtitle><date>1998-10-01</date><risdate>1998</risdate><volume>62</volume><issue>19</issue><spage>3229</spage><epage>3237</epage><pages>3229-3237</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>Stable isotope (
18O/
16O and
13C/
12C) and minor-element compositions (Sr/Ca and Mg/Ca ratios) of ostracodes and gastropods separated from marsh sediments from San Francisco Bay, Northern California, were used to reconstruct paleoenvironmental changes in Petaluma Marsh over the past 700 yr. The value of δ
18O in the marsh carbonates reflects changes in freshwater inflow, evaporation, and temperature. Mg/Ca and Sr/Ca in ostracode calcite reflect changes in both freshwater inflow and temperature, although primarily reflect temperature changes in the salinity range of about 10–35‰. Ostracode δ
18O values show a gradual increase by 5‰ between 500 yr
BP and the present, probably reflecting rising sea level and increased evaporation in the marsh. Superimposed on this trend are higher frequency Mg/Ca and δ
18O variations (3–4‰), probably reflecting changes in freshwater inflow and evaporation. A period of low Mg/Ca occurred between about 100–300 cal yr
BP, suggesting wetter and cooler conditions during the Little Ice Age. Higher Mg/Ca ratios occurred 600–700 cal yr
BP, indicating drier and warmer conditions during the end of the Medieval Warm Period. Both ostracode and gastropod δ
13C values decrease up-core, reflecting decomposition of marsh vegetation, which changes from C
4 (δ
13C ∼ −12‰) to CAM (δ
13C = −26‰)-type vegetation over time.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0016-7037(98)00240-3</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| source | Elsevier ScienceDirect Journals |
| subjects | AQUATIC ORGANISMS CALIFORNIA CLIMATIC CHANGE ENVIRONMENTAL SCIENCES Freshwater Gastropoda GEOSCIENCES ISOTOPE RATIO MARSHES PALEOCLIMATOLOGY SEA LEVEL |
| title | Stable isotopes, Sr/Ca, and Mg/Ca in biogenic carbonates from Petaluma Marsh, northern California, USA |
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