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14C Dating of mortar from ruins of an early medieval church Hohenrätien GR, Switzerland

Irka Hajdas

Irka Hajdas

Laboratory of Ion Beam Physics, ETHZZurich, Switzerland
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Hajdas, Irka
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Mantana Maurer

Mantana Maurer

Laboratory of Ion Beam Physics, ETHZZurich, Switzerland
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Maurer, Mantana
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Maria Belen Röttig

Maria Belen Röttig

Laboratory of Ion Beam Physics, ETHZZurich, Switzerland
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Röttig, Maria Belen
  
Dec 31, 2020
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Article Category: CONFERENCE PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE “METHODS OF ABSOLUTE CHRONOLOGY” JUNE 5-7TH, 2019, TARNOWSKIE GORY, POLAND
Published Online: Dec 31, 2020
Page range: 118 - 123
Received: Dec 16, 2019
Accepted: May 29, 2020
DOI: https://doi.org/10.2478/geochr-2020-0027
Keywords
© 2020 I. Hajdas., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig 1a

Map of Switzerland and the location of the castle of Hohenrätien (GR) − Sils im Domleschg.
Map of Switzerland and the location of the castle of Hohenrätien (GR) − Sils im Domleschg.

Fig 1b

The castle of Hohenrätien (GR) − Sils im Domleschg.
The castle of Hohenrätien (GR) − Sils im Domleschg.

Fig 2

Location of the mortar samples analyzed in this study (Figure modified from (Gairhos and Janosa 2011)).
Location of the mortar samples analyzed in this study (Figure modified from (Gairhos and Janosa 2011)).

Fig 3

Radiocarbon ages of the three samples obtained after sequential dissolution in 3-second intervals. The first fraction was the collection of CO2 after the first 3 seconds and the consecutive fractions were collected in 3-second intervals (x-axis shows dissolution fractions: 1=1st fraction 1−3 s; 2= 2nd fraction 4−6 s; 3= 3rd fraction 7−9 s; 4=4th fraction 10−12 s). The red square marks the age of the lime lump.
Radiocarbon ages of the three samples obtained after sequential dissolution in 3-second intervals. The first fraction was the collection of CO2 after the first 3 seconds and the consecutive fractions were collected in 3-second intervals (x-axis shows dissolution fractions: 1=1st fraction 1−3 s; 2= 2nd fraction 4−6 s; 3= 3rd fraction 7−9 s; 4=4th fraction 10−12 s). The red square marks the age of the lime lump.

Fig 4

Calibrated radiocarbon ages of the fast fraction (1st) and the lime lump (LL).
Calibrated radiocarbon ages of the fast fraction (1st) and the lime lump (LL).

Fig 5

Combined (weighted mean) radiocarbon age of 1st fraction and the lime lump, calibrated using OxCal 4.3.2 and INTCAL13 data set.
Combined (weighted mean) radiocarbon age of 1st fraction and the lime lump, calibrated using OxCal 4.3.2 and INTCAL13 data set.

Results of the 14C AMS analysis of mortar samples_ All the samples but lime lump (LL) were analyzed using GIS_ Combined and calibrated ages were obtained using OxCal v4_3_2 (only for 14C ages evaluated as accurate)_

Lab CodeSample/Fraction (μm)Dissolution time (s)14C age ±1 sigma (BP)Calibrated age (95.4% conf. level) (AD)μg C
ETH-65530891, 45−631−31534±84348−656 AD95
ETH-65530891, 45−634−61688±88NA109
ETH-65530891, 45−637−92108±102NA108
ETH-65530891, 45−6310−122621±101NA104
ETH-65530891, 32−451−31605±74257−606 AD60
ETH-65530891, 32−454−61737±83NA105
ETH-65530891, 32−457−92144±103NA88
ETH-65530891, 32−4510−122461±105NA96
ETH-69913894, 45−631−31386±64543−770 AD81
ETH-69913894, 45−634−61581±63NA99
ETH-69913894, 45−637−91664±77NA91
ETH-69913894, 45−6310−122254±76NA82
ETH-85506897, LL (lime lumps)Total dissolution1569±24422−547 AD1200

graphite

Combined891 & 894all 1−3 s1495±41430−646 ADX2-Test: df=2 T=5.3 (5% 6.0)
Combined891 & 894 & 897all 1−3 s & LL1551±21427−559 ADX2-Test: df=3 T=7.7 (5% 7.8)
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