Interpretation of orbital scale variability in mid-latitude speleothem δ18O: Significance of growth rate controlled kinetic fractionation effects

Stoll, Heather; Méndez-Vicente, Ana; González-Lemos, Saúl; Moreno, Ana; Cacho, Isabel; Cheng, Hai

doi:10.1016/j.quascirev.2015.08.025

Cited by 34 publications

(37 citation statements)

References 36 publications

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“…6). The absolute difference in δ 18 O values, especially pronounced between MAW-6 and MWS-1, was likely related to varying degrees of isotopic fractionation at different drip sites in the cave (similar to, e.g., Stoll et al, 2015). For more quantitative information, the three time series were interpolated to annual resolution and low-pass filtered in order to only consider centennial time scale variations.…”

Section: Discussionmentioning

confidence: 52%

Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation

et al. 2017

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24Northeastern India experiences extraordinarily pronounced seasonal climate, 25 governed by the Indian Summer Monsoon (ISM). The vulnerability of this region to 26 floods and droughts calls for detailed and highly resolved paleoclimate 27 reconstructions in order to assess the recurrence rate and driving factors of ISM 28 changes. We use stable oxygen and carbon isotope ratios (δ 18 O and δ 13 C) from 29 stalagmite MAW-6 from Mawmluh Cave to infer climate and environmental 30 conditions in northeastern India over the last deglaciation (16-6 kyr BP). We interpret 31 stalagmite δ 18 O as reflecting ISM strength, while δ 13 C appears to be driven by local 32 hydroclimate conditions. Pronounced shifts in ISM strength over the deglaciation are 33 apparent from the δ 18 O record, similarly to other records from monsoonal Asia. The 34 ISM is weaker during the late glacial and the Younger Dryas, and stronger during the

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Section: Discussionmentioning

confidence: 52%

Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation

et al. 2017

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“…At 8.6 ± 0.4 ka speleothem ASR stopped growing, associated with drier and colder conditions throughout southern Europe 37 during the “8.2 ka” event 38 39 , which is known to have had an impact on the climate of this region 40 . Growth in speleothem ASM started at 7.7 ka, suggesting wetter climatic conditions returned to N. Spain during the mid-Holocene thermal optimum 41 . The late Holocene is dominated by four arid periods, one of which corresponds to the well-known “4.2 ka” drought 35 42 , extending the known spatial influence of this drought to the western fringes of Europe.…”

Section: Resultsmentioning

confidence: 99%

North Atlantic forcing of moisture delivery to Europe throughout the Holocene

Smith

Wynn

Barker

et al. 2016

Sci Rep

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Century-to-millennial scale fluctuations in precipitation and temperature are an established feature of European Holocene climates. Changes in moisture delivery are driven by complex interactions between ocean moisture sources and atmospheric circulation modes, making it difficult to resolve the drivers behind millennial scale variability in European precipitation. Here, we present two overlapping decadal resolution speleothem oxygen isotope (δ18O) records from a cave on the Atlantic coastline of northern Iberia, covering the period 12.1–0 ka. Speleothem δ18O reveals nine quasi-cyclical events of relatively wet-to-dry climatic conditions during the Holocene. Dynamic Harmonic Regression modelling indicates that changes in precipitation occurred with a ~1500 year frequency during the late Holocene and at a shorter length during the early Holocene. The timing of these cycles coincides with changes in North Atlantic Ocean conditions, indicating a connectivity between ocean conditions and Holocene moisture delivery. Early Holocene climate is potentially dominated by freshwater outburst events, whilst ~1500 year cycles in the late Holocene are more likely driven by changes internal to the ocean system. This is the first continental record of its type that clearly demonstrates millennial scale connectivity between the pulse of the ocean and precipitation over Europe through the entirety of the Holocene.

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“…In order to obtain the isotopic signatures, each carbonate sample was dissolved in 100% H 3 PO 4 at a constant temperature of 25°C to extract the CO 2 gas [ McCrea , ], which was analyzed in a mass spectrometer, following the procedure described in Stoll et al . []. Results are expressed using the conventional δ 18 O and δ 13 C notation with respect to the Pee Dee Belemnite (PDB) standard.…”

Section: Study Techniques Sample Selection and Methodsmentioning

confidence: 99%

Mantle exhumation and metamorphism in the Basque‐Cantabrian Basin (NSpain): Stable and clumped isotope analysis in carbonates and comparison with ophicalcites in the North‐Pyrenean Zone (Urdach and Lherz)

DeFelipe

Pedreira

Pulgar

et al. 2017

Geochem Geophys Geosyst

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The presence of ophicalcites in serpentinized peridotites together with fragments of these rocks in Cretaceous breccias along several North-Pyrenean basins led to the interpretation of complete mantle exhumation to the seafloor. The westernmost outcrop of peridotites in the Pyrenean-Cantabrian belt is located in Ziga (eastern Basque-Cantabrian Basin), associated to a band of HT metamorphism related to the Leiza fault (Marble Unit). We present a petrological and geochemical study of the marbles and Ziga peridotite-hosted calcite, including standard stable isotope composition and clumped isotope geothermometry. These isotopic techniques allow the determination of different types of formational fluids and crystallization temperatures, and are a useful tool for studying carbonation processes in hyperextended basins. Fieldwork and analytical studies lead us to conclude that during the opening of the Bay of Biscay, mantle rocks were unroofed at the base of the sedimentary pile of the eastern Basque-Cantabrian Basin. However, the ophicalcite veins were recrystallized from meteoric fluids at low temperatures (498C). The primary carbonate phase may have been formed either during the mid-Cretaceous unroofing of the mantle or in a post-exhumation stage. The process of mantle exhumation was accompanied with HT-LP metamorphism and fluid circulation along major faults that reset the marine isotopic signature in the nearest marbles. For comparison, ophicalcites from Urdach and Lherz (North-Pyrenean Zone) were included in the clumped isotope study. Results show that they were recrystallized from hot (200-2308C), saline fluids, and from meteoric fluids at near ambient temperatures (32-428C), respectively.

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Interpretation of orbital scale variability in mid-latitude speleothem δ18O: Significance of growth rate controlled kinetic fractionation effects

Cited by 34 publications

References 36 publications

Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation

Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation

North Atlantic forcing of moisture delivery to Europe throughout the Holocene

Mantle exhumation and metamorphism in the Basque‐Cantabrian Basin (NSpain): Stable and clumped isotope analysis in carbonates and comparison with ophicalcites in the North‐Pyrenean Zone (Urdach and Lherz)

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Interpretation of orbital scale variability in mid-latitude speleothem δ18O: Significance of growth rate controlled kinetic fractionation effects

Cited by 34 publications

References 36 publications

Climatic and in-cave influences on δ18O and δ13C in a stalagmite from northeastern India through the last deglaciation

Climatic and in-cave influences on δ18O and δ13C in a stalagmite from northeastern India through the last deglaciation

North Atlantic forcing of moisture delivery to Europe throughout the Holocene

Mantle exhumation and metamorphism in the Basque‐Cantabrian Basin (NSpain): Stable and clumped isotope analysis in carbonates and comparison with ophicalcites in the North‐Pyrenean Zone (Urdach and Lherz)

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Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation

Climatic and in-cave influences on δ¹⁸O and δ¹³C in a stalagmite from northeastern India through the last deglaciation