Table 1.
Mg#’s and oxygen isotope ratios of host chondrules and relict grains.
| Chondrulea | Type-texture-relict | Mg# | +/− | n (ol, LPx, HPx)b | δ18O | unc.c | δ17O | unc.c | Δ17O | unc.c | Δ17O 2SD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Session-1:15μm beam size | |||||||||||
| A5 | I-POP | 99.5 | 0.2/0.1 | 7,0,0 | −6.4 | 0.3 | −9.3 | 0.3 | −6.0 | 0.2 | 0.5 |
| C2 | I-PO | 99.4 | 0.1/0.0 | 8,0,0 | −6.2 | 0.4 | −9.1 | 0.4 | −5.8 | 0.3 | 0.7 |
| A2 | I-POP | 99.4 | 0.1/0.1 | 4,2,0 | −4.9 | 0.5 | −8.0 | 0.3 | −5.5 | 0.2 | 0.5 |
| relict ol | 99.3 | n.c. | 1,0,0 | −4.2 | 0.3 | −7.0 | 0.4 | −4.8 | 0.4 | n.c. | |
| B5 | I-POP | 99.3 | 0.2/0.0 | 4,2,0 | −3.5 | 0.4 | −6.9 | 0.3 | −5.1 | 0.2 | 0.4 |
| relict ol | 99.3 | n.c. | 1,0,0 | −8.3 | 0.9† | −11.7 | l.l† | −7.3 | 0.6† | n.c. | |
| relict ol | 99.3 | n.c. | 1,0,0 | −7.5 | 0.2 | −10.6 | 0.3 | −6.7 | 0.4 | n.c. | |
| C9 | I-POP | 99.3 | 0.3/0.2 | 6,2,0 | −4.1 | 0.6 | −7.3 | 0.4 | −5.1 | 0.2 | 0.6 |
| B2 | I-PO | 99.3 | 0.1/0.2 | 7,0,1 | −4.7 | 0.6 | −7.5 | 0.5 | −5.0 | 0.3 | 0.6 |
| B1 | I-PP | 99.2 | 0.1/0.1 | 3,4,1 | −3.5 | 0.3 | −6.7 | 0.2 | −4.9 | 0.2 | 0.3 |
| B7 | I-PO | 99.3 | 0.3/0.2 | 7,0,0 | −3.3 | 0.5 | −6.4 | 0.2 | −4.7 | 0.2 | 0.6 |
| A1 | I-PO | 99.0 | 0.1/0.0 | 3,1,0 | −2.8 | 0.5 | −5.8 | 0.6 | −4.3 | 0.4 | 0.7 |
| relict ol | 99.4 | n.c. | 1,0,0 | −7.6 | 0.3 | −9.7 | 0.4 | −5.7 | 0.4 | n.c. | |
| relict ol | 99.4 | n.c. | 1,0,0 | −7.4 | 0.3 | −9.4 | 0.4 | −5.6 | 0.4 | n.c. | |
| relict ol | 99.3 | n.c. | 1,0,0 | −6.3 | 0.3 | −8.7 | 0.4 | −5.5 | 0.4 | n.c. | |
| A6 | I-POP | 99.0 | 0.1/0.0 | 0,2,0 | −2.2 | 0.5 | −5.3 | 0.3 | −4.1 | 0.2 | 0.0 |
| relict ol | 99.1 | n.c. | 1,0,0 | −5.4 | 0.1 | −8.5 | 0.2 | −5.6 | 0.2 | n.c. | |
| relict ol | 99.1 | n.c. | 1,0,0 | −5.3 | 0.1 | −8.0 | 0.2 | −5.3 | 0.2 | n.c. | |
| relict ol | 99.0 | n.c. | 1,0,0 | −5.4 | 0.1 | −8.6 | 0.2 | −5.7 | 0.2 | n.c. | |
| relict ol | 99.0 | n.c. | 1,0,0 | −4.8 | 0.1 | −7.7 | 0.2 | −5.3 | 0.2 | n.c. | |
| relict ol | 98.9 | n.c. | 1,0,0 | −5.5 | 0.1 | −8.6 | 0.2 | −5.8 | 0.2 | n.c. | |
| C8 | I-GOP | 96.0 | 0.2/0.6 | 2,4,0 | 0.3 | 0.3 | −2.6 | 0.3 | −2.7 | 0.3 | 0.6 |
| relict ol | 96.0 | n.c. | 1,0,0 | −13.2 | 0.1 | −14.7 | 0.3 | −7.8 | 0.3 | n.c. | |
| relict ol | 95.9 | n.c. | 1,0,0 | 0.6 | 0.1 | −3.1 | 0.3 | −3.4 | 0.3 | n.c. | |
| Cll | II-fragment | 70.3 | 8.0/17.2 | 9,0,0 | 2.0 | 0.4 | −1.5 | 0.3 | −2.6 | 0.2 | 0.2 |
| B9 | II-PO | 67.0 | 4.7/3.8 | 8,0,0 | 1.8 | 0.3 | −1.5 | 0.2 | −2.5 | 0.2 | 0.4 |
| B8 | II-PO | 67.5 | 3.1/4.9 | 6,0,0 | 2.7 | 0.3 | −0.9 | 0.3 | −2.3 | 0.2 | 0.1 |
| relict ol | 96.0 | n.c. | 1,0,0 | −5.0 | 0.2 | −8.2 | 0.4 | −5.6 | 0.4 | n.c. | |
| relict ol | 80.5 | n.c. | 1,0,0 | −3.5 | 0.2 | −6.9 | 0.4 | −5.1 | 0.4 | n.c. | |
| Session-2 : 10 μm beam size | |||||||||||
| B4 | I-PO | 99.3 | 0.1/0.2 | 7,0,0 | −5.8 | 0.6 | −9.1 | 0.6 | −6.0 | 0.3 | 0.7 |
| relict ol | 99.4 | n.c. | 1,0,0 | −9.8 | 0.3 | −13.0 | 0.6 | −7.9 | 0.5 | n.c. | |
| B6 | I-GO | 99.1 | 0.2/0.2 | 3,2,0 | −5.3 | 0.5 | −8.7 | 0.4 | −5.9 | 0.3 | 0.3 |
| relict ol | 99.1 | n.c. | 1,0,0 | −34.1 | 0.3 | −35.6 | 0.6 | −17.9 | 0.5 | n.c. | |
| relict ol | 99.0 | n.c. | 1,0,0 | −8.8 | 0.3 | −12.0 | 0.6 | −7.4 | 0.5 | n.c. | |
| C5 | I-PO | 99.3 | 0.2/0.1 | 4,2,1 | −5.2 | 0.3 | −8.4 | 0.3 | −5.7 | 0.2 | 0.4 |
| C3 | I-PO | 99.3 | 0.2/0.2 | 5,2,0 | −4.6 | 0.3 | −7.7 | 0.3 | −5.3 | 0.2 | 0.5 |
| relict ol | 99.2 | n.c. | 1,0,0 | −6.9 | 0.3 | −10.0 | 0.4 | −6.4 | 0.4 | n.c. | |
| Cl | I-POP | 99.2 | 0.2/0.1 | 8,3,0 | −3.5 | 0.6 | −6.8 | 0.4 | −5.0 | 0.2 | 0.6 |
| C4 | I-POP | 99.2 | 0.1/0.1 | 5,3,0 | −3.7 | 0.3 | −6.8 | 0.3 | −4.9 | 0.2 | 0.4 |
| A3 | I-POP | 99.2 | 0.2/0.1 | 5,1,0 | −1.8 | 0.4 | −5.6 | 0.4 | −4.6 | 0.4 | 0.8 |
| C7 | I-PP | 99.1 | 0.1/0.1 | 1,4,3 | −3.2 | 0.5 | −6.2 | 0.3 | −4.5 | 0.2 | 0.4 |
| C12 | II-PO | 64.9 | 6.4/11.9 | 8,0,0 | 3.5 | 0.4 | −0.5 | 0.3 | −2.3 | 0.3 | 0.2 |
| C6 | I-POP | 99.6 | 0.1/0.1 | 7,1,0 | 3.3 | 0.5 | 0.5 | 0.4 | −1.2 | 0.2 | 0.4 |
a
For each session, chondrules are sorted following decreasing host Δ17O values.
b
Numbers of mineral phases analyzed (olivine, low-Ca pyroxene, and high-Ca pyroxene).
c
Uncertainties of host oxygen isotope ratios are propagated, combining (1) the 2SE of chondrule measurements, (2) 2SE of associated SC olivine bracketing analyses, and (3) influences from sample topography/positioning. Uncertainties of oxygen isotope ratios of relict grains are the spot-to-spot reproducibility (2SD), as determined by bracketing analyses of SC olivine.
†
2SE of the measurement (see EA4). n.c.: not calculated