Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 829-847 |
| Number of pages | 19 |
| Journal | Quaternary Research |
| Volume | 91 |
| Issue number | 2 |
| Early online date | 11 Dec 2018 |
| DOIs | |
| Publication status | Published - Mar 2019 |
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Keywords
- cosmogenic isotopes
- paleoclimate
- Quaternary
- Europe
- Cosmogenic isotopes
ASJC Scopus subject areas
- Earth-Surface Processes
- Arts and Humanities (miscellaneous)
- Earth and Planetary Sciences(all)
Cite this
Temperatures recorded by cosmogenic noble gases since the last glacial maximum in the Maritime Alps. / Tremblay, Marissa M. (Corresponding Author); Shuster, David L.; Spagnolo, Matteo; Renssen, Hans; Ribolini, Adriano.
In: Quaternary Research, Vol. 91, No. 2, 03.2019, p. 829-847.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Temperatures recorded by cosmogenic noble gases since the last glacial maximum in the Maritime Alps
AU - Tremblay, Marissa M.
AU - Shuster, David L.
AU - Spagnolo, Matteo
AU - Renssen, Hans
AU - Ribolini, Adriano
N1 - MMT and DLS acknowledge support from the National Science Foundation (NSF) Petrology and Geochemistry Program (EAR- -1322086 to DLS), the UC Berkeley Larsen Grant, and the Ann and Gordon Getty Foundation. MMT was supported by an NSF Graduate Research Fellowship. MS acknowledges support from the Royal Society (IE150603), the Leverhulme Trust (IAF-2016-001), and NERC (CIAF 9092.1010). AR acknowledges support from the University of Pisa fund PRA (2017). M. Uebner and S. Woodmansee are thanked for help with sample preparation. We also thank Associate Editor Kathleen R. Johnson, Jakob Heyman, and an anonymous reviewer for constructive feedback on this work.
PY - 2019/3
Y1 - 2019/3
N2 - While proxy records have been used to reconstruct late Quaternary climate parameters throughout the European Alps, our knowledge of deglacial climate conditions in the Maritime Alps is limited. Here, we report temperatures recorded by a new and independent geochemical technique—cosmogenic noble gas paleothermometry—in the Maritime Alps since the last glacial maximum. We measured cosmogenic 3He in quartz from boulders in nested moraines in the Gesso Valley, Italy. Paired with cosmogenic 10Be measurements and 3He diffusion experiments on quartz from the same boulders, the cosmogenic 3He abundances record the temperatures these boulders experienced during their exposure. We calculate effective diffusion temperatures (EDTs) over the last ∼22 ka ranging from 8°C to 25°C. These EDTs, which are functionally related to, but greater than, mean ambient temperatures, are consistent with temperatures inferred from other proxies in nearby Alpine regions and those predicted by a transient general circulation model. In detail, however, we also find different EDTs for boulders from the same moraines, thus limiting our ability to interpret these temperatures. We explore possible causes for these intra-moraine discrepancies, including variations in radiative heating, our treatment of complex helium diffusion, uncertainties in our grain size analyses, and unaccounted-for erosion or cosmogenic inheritance.
AB - While proxy records have been used to reconstruct late Quaternary climate parameters throughout the European Alps, our knowledge of deglacial climate conditions in the Maritime Alps is limited. Here, we report temperatures recorded by a new and independent geochemical technique—cosmogenic noble gas paleothermometry—in the Maritime Alps since the last glacial maximum. We measured cosmogenic 3He in quartz from boulders in nested moraines in the Gesso Valley, Italy. Paired with cosmogenic 10Be measurements and 3He diffusion experiments on quartz from the same boulders, the cosmogenic 3He abundances record the temperatures these boulders experienced during their exposure. We calculate effective diffusion temperatures (EDTs) over the last ∼22 ka ranging from 8°C to 25°C. These EDTs, which are functionally related to, but greater than, mean ambient temperatures, are consistent with temperatures inferred from other proxies in nearby Alpine regions and those predicted by a transient general circulation model. In detail, however, we also find different EDTs for boulders from the same moraines, thus limiting our ability to interpret these temperatures. We explore possible causes for these intra-moraine discrepancies, including variations in radiative heating, our treatment of complex helium diffusion, uncertainties in our grain size analyses, and unaccounted-for erosion or cosmogenic inheritance.
KW - cosmogenic isotopes
KW - paleoclimate
KW - Quaternary
KW - Europe
KW - Cosmogenic isotopes
UR - http://www.scopus.com/inward/record.url?scp=85063938673&partnerID=8YFLogxK
U2 - 10.1017/qua.2018.109
DO - 10.1017/qua.2018.109
M3 - Article
VL - 91
SP - 829
EP - 847
JO - Quaternary Research
JF - Quaternary Research
SN - 0033-5894
IS - 2
ER -