Table 1
Cooling ages (in Ma) determined for L chondrites.
| Shock- | Thermochronometer | |||||||
|---|---|---|---|---|---|---|---|---|
| Type | stage | Hf-W | U-Pb-Pb | I-Xe | Ar-Ar (a) | Used | ||
| Closure- | 1148 ± 50 | 720 ± 50 | 770 (b) ± 60 | 550 ± 20 | ||||
| temperature (K) | 650 (c) ± 50 | |||||||
| Bruderheim | L6 | S2/S4(15,16) | 4556.9 ± 0.8 (1) | 4514.58 ± 0.54 (1) | 4500 (d) ± (9) | √ | ||
| 4509.55 ± 1.36 (6) | ||||||||
| Saratov | L4 | S2/S3 (15,17,18) | 4563.9 ± 0.7 (8) | 4530.0 ± 6.0 (4) | 4551.0 (d) ± 0.9 (12) | 4440.0 ± 30.0 (5) | ||
| Elenovka | L5 | S2 (16) | 4558.8 ± 0.8 (8) | 4535.0 ± 1.0 (3) | √ | |||
| 4555.03 ± 0.52 (11) | 4550 (d) ± 5 (11) | |||||||
| Homestead | L5 | 4562.8 ± 1.3 (8) | 4514.5 ± 1.3 (2) | |||||
| Barwell | L5-6 | 4559.7 ± 0.7 (8) | 4538.4 ± 0.8 (2) | 4430.0 ± 40.0 (5) | √ | |||
| 4510.0 ± 100 (10) | ||||||||
| Ladder Creek | L6 | S3 (15) | 4555.5 ± 1.1 (8) | 4510.8 ± 1.0 (6) | √ | |||
| Marion (Iowa) | L6 | S4 (15) | 4555.1 ± 1.2 (8) | 4511.3 ± 0.5 (2) | √ | |||
| Floyd | L4 | S3 (16) | 4551.5 ± 1.2 (8) | |||||
| Ausson | L5 | S3 (16) | 4528.0 ± 1.7 (2) | |||||
| Knyahinya | L5 | S3 (15) | 4542.6 ± 2.4 (2) | |||||
| Shaw | L7 | S1 (15) | 4420.0 ± 40.0 (5) | |||||
| ALHA-81 023 | L5 | 4534.87 ± 1.67 (6) | ||||||
| ALH-85 026 | L6 | 4505.71 ± 0.75 (6) | ||||||
| Modoc | L6 | S2 (15) | 4509 (c) ± 4 (9) | |||||
| Walters | L6 | S4 (16) | 4512 (c) ± 4 (9) | |||||
| Park | L6 | S1 (15) | 4525.8 ± 4.6 (13) | |||||
| Kusnashak | L6 | 4558.6 ± 0.6 (14) | ||||||
| Tennasilm | L4 | 4563.5 ± 0.7 (14) | ||||||
| NWA6630 | L5 | 4561.6 ± 0.8 (14) | ||||||
| CAI formation time | 4567.3 ± 0.4 (7) | |||||||
Notes. Data of meteorites marked with a hook are used for model optimisation. (a) Without correction for miscalibration of K decay constant (Renne et al. 2011; Schwarz et al. 2011, 2012). For this, 30 Ma has been added to each of the pieces of data, except for L6 Park. (b)feldspar, (c) phosphates, (d) whole-rock data.
References.(1) Sprung et al. (2010), (2) Göpel et al. (1994), (3) Amelin (2001), (4) Rotenberg & Amelin (2001), (5) Turner et al. (1978), (6) Blackburn et al. (2017), (7) Connelly et al. (2012), (8) Sprung et al. (2011), (9) Brazzle et al. (1999), (10) Hutschison et al. (1988), (11) Pravdivtseva et al. (2004), (12) Pravdivtseva et al. (2006), (13) Ruzicka et al. (2015), (14) Hellmann et al. (2019) and priv. comm., (15) Bischoff et al. (2018), (16) Stöffler et al. (1991), (17) Rubin (1994), (18) Friedrich et al. (2004).
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