NDLI: Oxygen isotope analysis of diatom silica and authigenic calcite from Lake Pinarbasi, Turkey

Content Provider	Springer Nature Link
Author	Leng, Melanie Barnker, Philip Greenwood, Peter Roberts, Neil Reed, Jane
Copyright Year	2001
Abstract	There is increasing interest in the $^{18}$O/$^{16}$O ratio of diatom silica, particularly for lakes where carbonates are absent. Here we compare the $^{18}$O/$^{16}$O ratios preserved in diatom silica and authigenic calcite from an open, spring-fed, freshwater lake core from Turkey which spans marine oxygen isotope stage 3. The two sets of isotope data show contrasting trends in spite of their mutual dependence on the water $^{18}$O/$^{16}$O ratio and lake-water temperature. The most likely explanation for this divergence is difference in seasonality of biological productivity mediated by the strongly continental climate of the Anatolian plateau. Diatom silica and authigenic calcite are precipitated from solutes in the lake-water at different times of the year. Diatom productivity follows a well-defined seasonal cycle, peaking first and most importantly in the spring and then in the autumn. The precipitation of calcite follows productivity by all forms of photosynthetic organisms that deplete CO$_{2}$ but in most lakes this occurs during the summer months. The δ$^{18}$O$_{calcite}$ curve shows mean summer temperature maxima at ca. 30–35 and ca. 58 ka BP while the intervening data represent a period of relatively cool summers. The δ$^{18}$O$_{diatom}$ curve shows bipolar results (15–20 and 29–33‰), which suggests that at least two discrete sources or processes contributed to the oxygen composition of the diatoms but probably involved a dilution mechanism to shift the isotopic values. The most likely source of depleted water is from snow entering the lake during the spring thaw. We infer that many authigenic calcite curves from regions with markedly seasonal climates may be temporally limited to a few summer months and that diatom silica provides complementary data on seasonally-specific water isotopic composition rather than a substitute for analyses based on carbonate.
Starting Page	343
Ending Page	349
Page Count	7
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	25
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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