Journal
ORGANIC GEOCHEMISTRY
Volume 111, Issue -, Pages 126-135Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2017.06.009
Keywords
Southern California marine sediments; Marine isotope stage 3; 5 alpha(H)-stanol/Delta(5)-sterol ratios; Oxygen minimum zone; Redox; TMAH GC-MS
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Funding
- JSPS KAKENHI [JP 18540484]
- Grants-in-Aid for Scientific Research [15K05355] Funding Source: KAKEN
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In this study, we analyzed 5 alpha(H)-stanol/Delta(5)-sterol ratios in offshore marine sediments using offline tetramethylammonium hydroxide thermochemolysis (TMAH) gas chromatography-mass spectrometry (GC-MS). Data were used to reconstruct redox events recorded in a southern California marine sediment core (Ocean Drilling Program, Leg167, Hole 1017E). The 24-nordehydrocholestanol/24-nordehydrocholesterol and diatomstanol/diatomsterol ratios clearly recorded oxygen minimum zone (OMZ) fluctuations in southern California during the last 40 kyr. In particular, two ratios corresponding to Marine Isotope Stage 3 (MIS3) varied significantly at the OMZ, exhibiting millennial-scale fluctuations related to Dansgaard-Oeschger shifts of warming and cooling intervals. In contrast, other ratios (cholestanol/cholesterol, campestanol/campesterol, sitostanol/sitosterol, and 22-dehydrocholesta nol/22-dehydrocholesterol) showed no significant trends, possibly reflecting the influence of stanolcreating organisms. Our results show that 5 alpha(H)-stanol/Delta(5)-sterol ratios obtained using the TMAH GC-MS method are useable tracers of water column and surface sediment redox conditions in southern California marine sediments. (C) 2017 Elsevier Ltd. All rights reserved.
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