Air pressure and cosmogenic isotope production

Stone, John O.

doi:10.1029/2000jb900181

Cited by 2,029 publications

(2,114 citation statements)

References 27 publications

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“…A series of calibration studies have established the spallogenic and muongenic 36 Cl production system in carbonate rocks [15][16][17][18]. Accordingly the 36 Cl production rates in this study were calculated based on the chemical compositions of the carbonate rock (Tables 2 and 3), and scaled by using geographic information (latitudes and altitudes) of individual locations.…”

Section: Resultsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

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This study quantifies surface denudation of carbonate rocks by the first application of in-situ cosmogenic 36 Cl in China. Concentrations of natural Cl and in-situ cosmogenic 36 Cl in bare carbonates from Guizhou karst areas were measured with isotope dilution by accelerator mass spectrometer. The Cl concentration varied from 16 to 206 ppm. The 36 Cl concentrations were in range of (0.8-2.4)10 6 atom g −1 , resulting in total denudation rates of 20-50 mm ka −1 that averaged over a 10 4 -10 5 a timescale. The 36 Cl-denudation rates showed roughly a negative correlation with the local mean temperature. This preliminary observation may suggest the variations of proportions of chemical weathering and physical erosion in denudation process, depending upon local climatic conditions. in-situ cosmogenic 36 Cl, denudation rate, climatic condition, carbonate, Guizhou Citation:Xu S, Liu C Q, Freeman S, et al. In-situ cosmogenic 36 Cl denudation rates of carbonates in Guizhou karst area.

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Section: Resultsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

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“…Bromley et al [37] defined a lower moraine group (~5000-4900 m), extending to the lower area of the glacial valleys, as CI and a higher moraine group (~5500 m), deposited in the middle part of the Santiago valley, as CII. For each group of moraines they found two age ranges, depending on the scaling model used: Lm [70] or Li [71][72][73]: -CI moraines:~25-15 ka (Lm) and~21-12 ka (Li), with outlier ages~47 and~31 ka (Li) and~61 and~37 ka (Lm). -CII moraines:~11-12 ka (Lm) and~11-8 ka (Li).…”

Section: Snowlines Elas and Glacial Datingmentioning

confidence: 99%

Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes

et al. 2018

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This work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently covered by the largest tropical glacier on Earth. The current glacier extent, the moraines deposited in the past and paleoglaciers at their maximum extension have been mapped. The present and past Equilibrium Line Altitudes (ELA and paleoELA) have been reconstructed and the chlorine-36 ages have been calculated, for preliminary absolute dating of glacial and volcanic processes. The paleoELA depression, the thermometers installed in the study area and the accumulation data previously published allowed development of paleotemperature and paleoprecipitation models. The Coropuna glaciers were in maximum extension (or glacial standstill) 20-12 ka ago (and maybe earlier). This last maximum extension was contemporary to the Heinrich 2-1 and Younger Dryas events and the Tauca and Coipasa paleolake transgressions on Bolivian Altiplano. The maximum paleoELA depression (991 m) shows a colder (−6.4 • C) and moister climate with precipitation ×1.2-×2.8 higher than the present. The deglaciation onset in the Arid Tropical Andes was 15-11 ka ago, earlier in the most southern, arid, and low mountains and later in the northernmost, less arid, and higher mountains.

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“…In the case of Illimani (Smith et al, 2011), ages were not available in the Shakun et al (2015a) composite, and we recalculated with the Quelccaya 10 Be production rate calibration (Kelly et al, 2015), and the CRONUS-Earth calculator version 2.3 with the time-invariant 'St' scaling method of Stone (2000) following Lal (1991). Newly published data from the Cordillera Carabaya (Bromley et al, 2016) and Nevado Huaguruncho (Stansell et al, 2015) were calculated by the authors using the Quelccaya production rates.…”

Section: Methodsmentioning

confidence: 99%

The last deglaciation of Peru and Bolivia

Mark

Stansell

Zeballos

2017

CIG

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ABSTRACT. The tropical Andes of Peru and Bolivia are important for preserving geomorphic evidence of multiple glaciations, allowing for refinements of chronology to aid in understanding climate dynamics at a key location between hemispheres. This review focuses on the deglaciation from Late-Pleistocene maximum positions near the global Last Glacial Maximum (LGM). We synthesize the results of the most recent published glacial geologic studies from 12 mountain ranges or regions within

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Air pressure and cosmogenic isotope production

Cited by 2,029 publications

References 27 publications

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes

The last deglaciation of Peru and Bolivia

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