Open Access
Table 1
Metamorphic and clastic minerals from the marble samples.
| Sample | Outcrop (see Figs. 4 and 5) | Field type | Mineral assemblage | Clastic elements | Protolith |
|---|---|---|---|---|---|
| SR120 | Oued Taza (TZ, 1c) N35 13 52, W 4 48 51 |
Thinly bedded marbles-phyllites alternations | Cal,Mg-Di, Ttn, aggr Scp-Ilt-Zeo, aggr Ms-Chl-Ttn-Kfs, aggr Ab-Kfs, Tlc, Zrn (incl Di, Kfs, Ap, Plg) | Zrn core? | Limestone (interleaved with argillites, cf. MTS17, 18, 21) |
| SR123 | Oued Amter road (TZ, 1b) N35 13 46, W 4 48 45 |
Impure saccharoid marbles | Cal, Phl, Ttn (incl Rt-Qz), Di (incl Tr, corrTlc + Qz), Scp, Zrn, Qz, Po, aggrTlc, pseud (Qz-Cal-Chl), U-Th oxydes | Qz, Zrn | Slightly detrital, slightly dolomitic limestone |
| SR138 | Oued Ljouj (OL) N35 11 43, W 4 50 47 |
Fine grained marble | Dol, Phl, Mg-Spl, pseud Di (Cal-Srp after Fo), Gk, Zirconolite | Null | Dolostone |
| MTS1 | Oued Amter road (TZ, 1b) N35 13 46, W 4 48 45 |
Thin silica-rich bed in saccharoid marble | Cal, Di (corrTlc), Qz, Scp (corrAb + Zo), Wo (corrCal + Qz) + Aggr Di-Kfs-Ttn-Prh (ex-pebbles) | Qz, Zrn Tiny Kfs-rich pebbles |
Sandy layer in a thick limestone bed |
| MTS5 | Oued Amter road (TZ, 1a) N35 13 43, W 4 48 49 |
Saccharoid marbles with cm-size pebbles | Matrix: Cal, Mg-Di, Kfs, Scp (rimCzo, Grs), Pl (rimGrs), Grs,Ttn, ovPlg, aggr Ca-Qz, Pebble: Fe-Di, Pl, Kfs, Qz, Grt (Alm 53, Grs 29, Prp 16), Zrn (incl nanogranite), Ap | Rounded grains: Kfs, Pl Pebble: 1) main part: Kfs, Pl, Di, Grt, Zrn; 2) Outer bed: Qz, Pl, Di |
Detrital, poorly magnesian limestone with gneissic pebbles (unconformable on kinzigites) |
| MTS10 | Upp. Inoualine (IN, 2b) N35 13 19, W 4 48 19 |
Greenish silicate bed within marbles and clastic alternations | Cal, Czo (Fe/Al + Fe 0.25) incl Aln, and corr Mg-Chl-Qz, Qz, Gr, Di (xMg 0.50) corr Cal-Qz and incl Ttn, Gr, Ap, Py, Mnz | Zrn, Gr or CM | Fe- and CM-rich marl (clay fraction: kaolinite, chlorite…) |
| MTS12 | As MTS10 | Clastic, dm-thick bed below MTS10 | Cal, Pl (Ca-rich core, Na-rich rim) rim Di/Amp-Chl,Di (Mg-rich core, Fe-rich rim), Fe-Mg-Chl, Ilm, Zrn, Grt (Alm 60, Prp 33, Grs 5) incl Pl, Chl; Zrn, Rt, Ab incl Chl | Qz, clay, Alm | Fe-rich detrital layer beneath MTS10 |
| MTS13 | As MTS10 | Pinky marble above MTS10 | Cal, Phl (xF 0.2), Fo, ov Srp, Mg-Spl corr Chl, Di, Brt, Po | Dolomitic limestone | |
| MTS15 | Low. Inoualine (IN, 2a) N35 13 27, W 4 48 26 |
Fine grained marble unconformable over kinzigites | Dol, Cal, Fo, Mg-Spl, Phl, Gk, Bdy (rim Zrn), zirconolite, Str, Brt | Dolostone (unconformable on kinzigites) | |
| MTS16 | As MTS15 | Saccharoid marble with silicate-rich lenses | Marble: Cal, Scp (corrMs, Zo), Ca-Pl (corr), MgFe-Di (corr), Ab (inter in Cal), Gr, some large Qz grains Si-rich layers: Ab, Qz, MgFe-Chl, Ttn, crushed Grt (Alm52 Grs32 Py14 Spe2), Pl, Kfs, Czo (inter in Cal), Zrn, aggrChl-Phg (rim Ep with Aln border) |
Qz, Pl, Kfs, Grt (Alm), Chl-Bi?, Zrn | Limestone with dm-thick detrital layers |
| MTS17 | Oued Taza (TZ, 1c) N35 13 52, W 4 48 51 |
Cf. SR120 | Cal, Pl, Fe-Ep, Qz, MgFe-Di (xMg 0.7), Scp, Ttn, Ap, Gr, Prh, Pmp | Impure limestone (interbedded with phyllites cf. MTS21) | |
| MTS21 | As MTS17 | Phyllites-rich marble | Phyllitic seams: Bt-Vrm Carbonate layers: Cal, Dol, Mg-Spl, Gk, zirconolite, Tlc, Plg |
Zrn in associated phyllitic layers (?) | Thinly bedded dolomitic marls |
| JN3, JN4 | Jnane Niche (JN) N35 14 26, W 4 53 03 |
Marbles with folded/boudinaged black silicate layers/seams | Cal, Kfs (rim Wo, Grs, Di), Qz (rim Wo, Di), Pl, Scp, Ttn, Di, Grs, Gr | Kfs, Qz | Carbonaceous, slightly detrital limestone with sandy layers |
| JN6 | As JN3 | Boudin from marble pseudo breccia | Marble layer: Cal, Scp, Ttn, Di, Wo, Grs, Gr Clastic layer: Kfs, Di, Ab, Ttn, Grs, Ccp (rim Wo) |
Kfs, Qz | Id |
| JN8 | As JN3 | Cf. JN6 | Cal, Ca-Pl, Grs, Wo, Di (incl Alm), Qz, Kfs, Zeo, Po, Gr | Qz, Kfs, Alm? | Calcareous sandy layer in limestone |
Mineral abbreviations after Whitney and Evans (2010), except K-Fs simplified to “Kfs”. aggr: aggregate of *; alt/corr: altered/corroded by *; incl: inclusion of *; inter: interstitial; ov: ovoid of *; pseud X (*): pseudomorphs after X (replaced by *); rim: reaction rim made up of *. CM: carbonaceous material.
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