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Figure 6
Figure 7
Figure 8
Detailed information on research profiles_
| Thin-section No. | Xenolith ID | Number of the xenoliths | Xenolith size on the thin-section (cm) | Number of measurement profiles | Length of measurement profile (mm) | Distance between measurement points (mm) | Number of measurement points |
|---|---|---|---|---|---|---|---|
| Jeziorna | |||||||
| 1 | J3_1 | 1 | 1.0–1.3 | 1 | 9.55 | 0.33 | 30 |
| 2 | 2 | 7.98 | 0.44 | 20 | |||
| 2 | J3_4 | — | — | — | — | — | — |
| 3 | J3_5_I | 2 | 1 | 3.88 | 0.53 | 10 | |
| 2 | 7.51 | 0.33 | 25 | ||||
| J3_5_II | 1 | 2.22 | 0.30 | 10 | |||
| 4 | J3_6_I | 2 | 0.5–0.9 | 1 | 4.82 | 0.34 | 15 |
| 2 | 6.03 | 0.51 | 15 | ||||
| J3_6_II | 0.1–0.1 | 1 | 1.35 | 0.21 | 8 | ||
| 5 | J3_7_I | 2 | 0.2–0.7 | 1 | 6.72 | 0.80 | 10 |
| J3_7_II | — | — | — | — | — | — | |
| 6 | J3_ 8 | 1 | 0.4–0.7 | 1 | 6.39 | 0.73 | 10 |
| 2 | 3.62 | 0.44 | 10 | ||||
| 7 | J3_10 | 1 | 0.1–0.2 | 1 | 2.07 | 0.23 | 8 |
| 2 | 1.35 | 0.21 | 10 | ||||
| 8 | J3_11b | 1 | 0.3–0.6 | 1 | 5.95 | 0.37 | 20 |
| 2 | 3.58 | 0.42 | 10 | ||||
| 9 | J3_12 | 1 | 0.5–0.9 | 1 | 8.83 | 1.38 | 30 |
| 2 | 4.89 | 1.00 | 10 |
Classification of chemical analyses of olivine (n = 185) according to geological processes that may have affected the studied xenoliths_
| Geological process | Regional variability among samples | Final-stage interactions | Other: analytical uncertainties | Other: weathering | Other: heating | ||
|---|---|---|---|---|---|---|---|
| Chemical composition of olivine (n = 185) | Group | Total analyses (n), Percentage of Group (%) | Geochemical composition Q2 Median (range Fo–3%, Ca + 400 ppm, Ni–400 ppm); (Aa, Ba, Ca) | Geochemical variation from Q2 (Fo decrease, Ca + 400 ppm, Ni–400 ppm) with diffusion rim in BSE image (Ac, Bc, Cc) | Geochemical variations from Q2 near Ca-bearing minerals (Ca + 400 ppm, Ni–400 ppm); (Bb1,Cb1) | Geochemical variations from Q2 near secondary minerals (Ca + 400 ppm, Ni–400 ppm); (Ab2, Bb2, Cb2) | Geochemical variations from Q2 (Ca + 400 ppm, Ni–400 ppm) – analyses without contact with Ca-bearing minerals (Bb3, Cb3) |
| Total number of analyses (n), Percentage (%) | A (Fo > 90) |
| 43, 23.3 | 10, 5.5 | — | 2, 1.1 | — |
| Crystal core (n), percentage (%) | 21, 12.3 | 17, 9.2 | 4, 2.1 | — | — | — | |
| Crystal rim (n), percentage (%) | 34, 17.4 | 26, 14.1 | 6, 3.2 | — | 2, 1.1 | — | |
| Total number of analyses (n), percentage (%) | B (Fo 80–90) |
| 68, 36.8 | 18, 9.7 | 8, 4.3 | 4, 2.2 | 8, 4.3 |
| Crystal core (n), percentage (%) | 50, 27.0 | 34, 18.4 | 8, 4.3 | — | — | 8, 4.3 | |
| Crystal rim (n), percentage (%) | 56, 30.3 | 34, 18.4 | 10, 5.4 | 8, 4.3 | 4, 2.2 | — | |
| Total number of analyses (n), percentage (%) | C (Fo < 80) |
| 11, 6 | 5, 2.7 | 4, 2.1 | 2, 1.1 | 2, 1.1 |
| Crystal core (n), percentage (%) | 13, 7.1 | 9, 4.9 | 2, 1.1 | — | — | 2, 1.1 | |
| Crystal rim (n), percentage (%) | 11, 5.9 | 2, 1.1 | 3, 1.6 | 4, 2.1 | 2, 1.1 | — | |
Modal composition of minerals in the studied xenoliths based on planimetric analysis_
| Sample name | Ol (%) | Opx (%) | Cpx (%) | Amp (%) | Spl (%) | ‘Melt pockets’ (%) | ‘Secondary minerals’ (%) | Cpx- rim crystals (%) | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | J3_1 | 54.3 | 3.3 | 0.0 | 0.0 | 0.0 | 0.0 | 42.1 | 0.3 |
| 2 | J3_4 | 3.6 | 0.0 | 81.7 | 0.0 | 0.0 | 5.8 | 0.0 | 9.0 |
| 3 | J3_5_I | 70.3 | 3.7 | 0.7 | 0.0 | 0.1 | 11.8 | 9.6 | 3.6 |
| 4 | J3_5_II | 29.4 | 34.1 | 0.8 | 0.0 | 0.0 | 0.9 | 0.0 | 34.8 |
| 5 | J3_6_I | 49.3 | 8.4 | 0.1 | 0.0 | 0.0 | 26.9 | 7.6 | 7.6 |
| 6 | J3_6_II | 96.1 | 0.0 | 0.0 | 0.0 | 0.0 | 3.9 | 0.0 | 0.0 |
| 7 | J3_7_I | 28.6 | 8.5 | 0.1 | 0.0 | 0.0 | 35.0 | 1.5 | 26.2 |
| 8 | J3_7 _II | 8.5 | 0.0 | 67.7 | 0.0 | 0.0 | 23.9 | 0.0 | 0.0 |
| 9 | J3_8 | 87.8 | 0.0 | 0.0 | 0.0 | 0.0 | 8.3 | 1.4 | 2.5 |
| 10 | J3_10 | 13.3 | 0.0 | 81.3 | 0.0 | 0.0 | 5.4 | 0.0 | 0.0 |
| 11 | J3_11b | 77.2 | 0.0 | 3.7 | 0.0 | 0.0 | 0.0 | 19.1 | 0.0 |
| 12 | J3_12 | 56.1 | 25.9 | 5.2 | 0.0 | 0.5 | 5.6 | 0.5 | 6.2 |
Basic information about the studied xenolith samples_
| Xenolith name | Xenolith diameter (cm) | Macroscopic observation | Rock name | Rock texture | Olivine in Xenoliths (mm) | Orthopyroxene in xenoliths (mm) | Clinopyroxene in xenoliths (mm) | Melt pockets in xenoliths (mm) | Reaction rim between host rock and pyroxene (μm) | Diffusion rim in olivine (μm) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | J3_1 | 1.15 | Cumulate | Dunite | Protogranular | 0.38–1.77 | 0.28–1.31 | — | — | 114–283 | 68–75 |
| 2 | J3_4 | 1.1 | Clinopyroxenite | Clinopyroxenite | Porphyroclastic | 0.21–1.58 | 0.19–0.32 | 1.96–7.91 | 0.48–4.77 | 250–480 | — |
| 3 | J3_5_I | 1.1 | Cumulate | Dunite | Porphyroclastic | 0.22–2.94 | 0.57–1.79 | 0.18–1.28 | 1.29 | 52–232 | 36–58 |
| 4 | J3_5_II | 0.235 | — | Harzburgite | Protogranular | 0.13–1.14 | 0.63–1.38 | 1.76 | — | 179–672 | 20–52 |
| 5 | J3_6_I | 0.55 | Ultramafic xenolith | Harzburgite | Equigranular | 0.2–0.65 | 0.29–0.98 | 0.18–0.76 | 0.52–1.54 | 120–390 | — |
| 6 | J3_6_II | 0.12 | — | Dunite | Equigranular | 0.21–1.22 | — | — | — | — | 47–73 |
| 7 | J3_7_I | 0.65 | Ultramafic xenolith | Harzburgite | Equigranular | 0.16–1.33 | 0.29–0.70 | 0.410 | 0.51–0.94 | 150–830 | 18–138 |
| 8 | J3_7 _II | 0.15 | — | Olivine clinopyroxenite | Equigranular | 0.14–0.2 | — | 0.97–1.19 | 0.62 | — | — |
| 9 | J3_8 | 0.8 | Ultramafic xenolith | Dunite | Protogranular | 0.26–3.29 | — | — | 1.5 | 210–257 | 30–156 |
| 10 | J3_10 | 0.6 | Crustal xenolith | Olivine clinopyroxenite | Equigranular | 0.13–0.37 | — | 0.26–1.44 | 0.37 | — | 11–28 |
| 11 | J3_11b | 0.45 | Ultramafic xenolith | Dunite | Protogranular | 0.20–2.83 | — | 0.21–0.38 | — | — | 31–139 |
| 12 | J3_12 | 0.5 | Ultramafic xenolith | Lherzolite | Protogranular | 0.30–3.20 | 0.36–1.57 | 0.29–1.23 | 0.24–0.92 | 199–403 | 32–250 |
Abbreviations used in the article_
| Abbreviation | Description |
|---|---|
| An | Anorthite |
| Amp | Amphibole |
| En | Enstatite |
| Di | Diopside |
| Ol | Olivine |
| Ol-Ia | Olivine – group Ia (main minerals in peridotites) |
| Ol-Ib | Olivine – group Ib (main minerals in pyroxenites) |
| Opx | Orthopyroxene |
| Opx-Ia | Orthopyroxene – group Ia (main minerals in peridotites) |
| Cpx | Clinopyroxene |
| Cpx-Ib | Clinopyroxene – group Ib (main minerals in pyroxenites) |
| Cpx-IIa | Clinopyroxene – group IIa (in melt pockets, peridotites) |
| Cpx-IIb | Clinopyroxene – group IIb (in melt pockets, pyroxenites) |
| Cpx-IIIa | Clinopyroxene – group IIIa (selvage, late generation, peridotites) |
| Cpx-IIIb | Clinopyroxene – group IIIb (selvage, late generation, pyroxenites) |
| Spl | Spinel |
| Spl-Ia | Spinel – group Ia (main minerals in peridotites) |
| Spl-IIa | Spinel – group IIa (in melt pockets, peridotites) |
| Spl-IIb | Spinel – group IIb (in melt pockets, pyroxenites) |
| Carb | Carbonate group mineral |
| Carb-IIa | Carbonate group minerals – group IIa (in melt pockets, peridotites) |
| Fs | Feldspar |
| Fs-IIb | Feldspar – group IIb (in melt pockets, pyroxenites) |
| mp | Melt pockets (fine-grained zones/intergranular aggregates) |
| Fo | Forsterite content in olivine (Mg/(Mg + Fe)*100) |
| Mg# | Magnesium number (Mg/(Mg + Fe)*100) in pyroxenes |
| apfu | Atoms per formula unit |
| BSE | Back-Scattered Electron (image in backscattered electrons) |
| Q1, Q2, Q3 | Quartile values used in statistical analysis |
| R | Crystal rim |
| C | Crystal core |