Open Access
Table 3
Zircon external and internal morphology. Indexing after Caruba and Turco (1971) for prismatic (100 and 110) and pyramidal faces (211 and 101).
| Sample | Extracted zircon (μg/g) | Whole-rock Zr content (μg/g) | Zircon grains | Zircon sections |
|---|---|---|---|---|
| Vo14-16 | 159 | 153 | Clear, euhedral, 100 < 110 et 211>101 | Concentrically zoned in CL |
| Vo15-01 | <607 | 315 | Short, multi-facetted soccerballs, cracked by internal inflation; highly metamict, creamy pattern under direct light (binocular); almost opaque, dark brown in transmitted light | KF, biot, thorite, apatite inclusions, very dark in CL |
| Vo15-04 | 230 | 223 | Pale pink and milky but transparent; often irregularly, step-facetted, or as easily broken arrowheads; looking corroded and/or fast crystallized | Dark in CL |
| Vo15-07 | 261 | 448 | Mostly elongate needles, clear, euhedral, 100>110 up to 100 alone, 101>211 up to 101 alone | Dark in CL, biotite inclusions, axial (glassy?) inclusions in elongate sections |
| Vo15-08 | 191 | 131 | Colourless, clear, many broken needles, plus shorter well-terminated euhedral grains, 100>110 and 101>211 | Axial (glassy?) inclusions in elongate sections, concentrical zoning in CL for shorter sections |
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