Table 1.

Analytical results

Samplex (mm)δ13C (VPDB)δ18O (VPDB)Δ47 (ARF)†Δ48 (LRF)‡T (°C)1000ln α§δ18Owater (VSMOW)
DLR7a-a03.45−9.550.541−0.027219.881+0.9
DLR7a-b53.52−9.810.506−0.159216.964+3.6
DLR7a-c103.30−8.210.597−0.064624.145−2.0
DLR7a-d153.46−8.770.580−0.035322.897−1.3
DLR7a-e202.71−9.050.547−0.046920.339+1.0
DLR7a-f252.52−9.190.545−0.017022.803+0.9
DLR7a-f*252.51−9.070.538−0.087319.646+1.6
DLR7a-g301.84−8.080.592−0.034823.756−1.5
DLR7a-g*301.84−7.920.580−0.015322.930−0.5
DLR7a-h353.33−8.480.565−0.046021.785+0.1
DLR7a-h*353.35−8.470.518−0.208418.000+1.0
DLR7a-i403.12−8.540.575−0.135522.514−0.7
DLR7a-i*403.19−8.570.547−0.146820.376+1.4
DLR7a-j453.08−8.510.525−0.128118.540+3.3
DLR7a-j*453.06−8.530.542−0.067119.931+1.9
DLR7a-k503.51−8.800.535+0.067519.379+2.2
DLR7a-l553.67−8.760.563−0.046121.6130.0
DLR7a-m603.46−8.860.565−0.076021.752−0.3
DLR7a-n653.61−9.350.556−0.096421.057−0.1
DLR7a-o703.67−9.480.5400.007219.812+1.1
DLR7a-p753.47−9.390.536−0.147419.458+1.5
DLR7a-q802.34−9.420.521−0.138318.217+2.7
DLR7b-a03.66−8.920.555−0.056421.008+0.4
DLR7b-b53.49−9.140.577+0.035422.641−1.4
DLR7b-c101.66−7.340.6350.003126.915−3.9
DLR7b-d153.19−9.080.522−0.198218.311+3.0
DLR7b-e203.50−9.420.493−0.2410015.880+5.1
DLR7b-f253.60−9.480.510−0.089017.288+3.6
DLR7b-g303.51−9.760.525−0.148118.541+2.0
DLR7b-h353.65−9.640.543−0.077119.984+0.7
DLR7b-i403.67−9.780.501−0.219516.583+4.0
DLR7b-j453.65−9.710.563−0.026121.560−0.9
DLR7b-k503.31−9.730.540−0.057219.804+0.8
DLR7b-l553.09−8.760.584−0.275123.210−1.6
DLR7b-m603.44−9.600.496−0.189916.091+4.7
DLR7b-n653.34−8.860.589−0.164923.557−2.1
DLR7b-o702.93−9.100.546−0.066920.273+1.0
DLR7b-p753.47−9.800.520−0.138418.121+2.4
DLR7b-q803.57−9.870.535−0.187519.347+1.1
DLR7b-r853.40−8.680.585−0.105123.252−1.6

*Replicate analyses.

†ARF is absolute reference frame (Dennis et al. 2011). Measurement precision is ±0.014‰.

‡LRF is local reference frame (i.e. measured with respect to the mass spectrometer working reference gas).

§Determined using the estimated T47), δ18O of the calcite and the Kim & O'Neil (1997) calibration of the calcite–water equilibrium fractionation factor, α.