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Clumped isotope analysis of lacustrine endogenic carbonates and implications for paleo-temperature reconstruction:A case study from Dali Lake

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Science China Earth Sciences 2021年第2期64卷 294-306页

作者： Jiaojiao YUE Jule XIAO Xu WANG Jiawei FAN Ben QIN Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China School of Earth Sciences Zhejiang UniversityHangzhou 310027China

Carbonate clumped isotope(Δ47)is a new and reliable *** carbonates in lake sediments are good archives to reconstruct lake water temperature using clumped isotope ***,applications of carbonate clumped isotope thermometry to lacustrine carbonates are still scarce because the existed organic and/or sulfur contaminants in such samples interfere with clumped isotope analysis and cause notable temperature ***,exploring an effective way to remove contamination is a prerequisite to widely applying carbonate clumped isotope thermometry to lake *** pretreating fine-grained endogenic carbonates from Dali lake sediments with hydrogen peroxide of different concentrations for different lengths of time,we conducted a series of conditional experiments to seek the optimal pretreatment condition for clumped isotope analysis.Δ47,Δ48 offset and 49 parameter were obtained from clumped isotope measurements to assess the effect of contamination *** showed that untreated samples("0%-0")had a very high 49 *** the treatment with hydrogen peroxide,the 49 parameter was significantly reduced while theΔ48 offset evidently ***Δ47,Δ48 offset and 49 parameter of samples pretreated under different conditions showed significant variability,even though the measuredΔ47 temperatures changed within a relatively narrow range(i.e.,from 17.0±1.3 to 22.8±1.6°C).Among various treated samples,the sample"3%-8"yielded a smallerΔ48 offset and 49 parameter,and lowerΔ47 temperature of 17.0±1.3°***,"reacting with 3%hydrogen peroxide for 8 h"was suggested to be the optimal condition for removing contaminants from lacustrine endogenic carbonates prior to clumped isotope *** the time when the pretreatment condition was too intense(i.e.,H2O2 concentration>3%and/or reaction time>8 h),secondary contaminants might have been generated in the closed reaction system,whose ultimately transformed state may interfere wit

关键词： Lacustrine endogenic carbonate Clumped isotope Paleo-temperature reconstruction hydrogen peroxide treatment Isobaric interference

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