The Charter of the French language and its regulations govern the Lithogeochemistry of Geological Units in the Dolbeau-Blondelas Area (sheets 32H01 and 32H07)
The tables below summarize the lithogeochemical characteristics of the geological units in the areas north of Dolbeau-Mistassini (sheet 32H01), Girardville and Blondelas Lake (sheet 32H07), in the Saguenay–Lac-Saint-Jean region. These units are described in the Geological Bulletin covering this area and in the Quebec Stratigraphic Lexicon. The 179 analyses used here come from samples collected during the Ministère‘s mapping campaign in the summer of 2021. They were selected on the basis of certain criteria, including a sum of major oxides between 98.5% and 101.5% and a loss on ignition (LOI) < 3%. These analyses were conducted by the Actlabs laboratory in Ancaster, Ontario.
The analyses were subjected to an internal and laboratory quality assurance and control process. To ensure the accuracy and precision of the values supplied by the laboratory, the Direction de l’acquisition des connaissances géoscientifiques du Québec (DACG) regularly inserts blanks, standards and duplicates. Reference materials account for ~10% of analyses.
The majority of the samples in the database were analyzed for major oxides, trace elements and metals. The analyses were conducted using different techniques depending on the elements, such as inductively coupled plasma mass spectrometer (ICP-MS), inductively coupled plasma-atomic emission spectrometry (ICP-AES) and instrumental neutron activation analysis (INAA). For more information on the analysis and dissolution techniques used, please refer to the information available for each sample in SIGÉOM à la carte.
The CIPW standard modified to include biotite and hornblende was calculated using the Hutchison method (1974, 1975) in the GeoChemical Data toolkit software (GCDkit, Janoušek et al., 2006) to produce classification diagrams for intrusive rocks. This software was used to produce the geochemical diagrams shown in the tables below.
Rare earth elements are normalized according to the Palme and O’Neill values (2004).
Felsic to Intermediate Intrusive Rocks
|
Stratigraphic or Lithological Unit |
Classification |
Affinity |
Type of Magmatism | Mg# |
Rare Earths |
Tectonic Setting |
|---|---|---|---|---|---|---|
|
Crevier Alkaline Intrusion (nPiac1a and 1b) |
Syenite, quartz syenite, nepheline syenite (Diagram) |
Mostly shoshonitic (Diagram) |
Ferriferous, alkaline, hyperalkaline to metaluminous |
0.93 – 20.20 |
7.00 < (La/Yb)N < 33.21 2.15 < (La/Sm)N < 6.01 0.84 < (Gd/Yb)N < 3.28 0.64 < Eu/Eu* < 1.06 (Diagram) |
Anorogenic (Diagram)
|
|
Rivière Noire Intrusion (mPirn) |
Syenite, quartz syenite, alkali feldpsar syenite (Diagram) |
Shoshonitic series (Diagram) |
Mostly magnesian, calcic to alkaline, metaluminous |
18.53 – 42.85 |
16.71 < (La/Yb)N < 61.41 1.94 < (La/Sm)N < 2.69 4.48 < (Gd/Yb)N < 11.83 0.99 < Eu/Eu* < 1.13 (Diagram) |
Mostly a signature of volcanic arc granites |
|
Tommy Intrusive Suite (mPtmm) |
Alkali feldspar granite, syenogranite, quartz syenite with or without hypersthene, hypersthene monzonite (mangerite), monzodiorite |
Calc-alkaline to shoshonitic (Diagram) |
Ferriferous, calc-alkaline to alkaline, metaluminous to peraluminous |
9.95 – 18.02 |
6.10 < (La/Yb)N < 30.87 2.23 < (La/Sm)N < 5.95 1.27 < (Gd/Yb)N < 5.38 0.51 < Eu/Eu* < 1.33 (Diagram) |
Mostly anorogenic (Diagram) |
|
Écluse Batholith (mPecl) |
Alkali feldspar granite, quartz syenite, alkali feldspar syenite (Diagram) |
Shoshonitic series (Diagram) |
Ferriferous, alkaline, mostly metaluminous |
12.10 – 24.45 |
21.09 < (La/Yb)N < 152.63 3.79 < (La/Sm)N < 8.61 2.95 < (Gd/Yb)N < 6.30 0.40 < Eu/Eu* < 1.80 (Diagram) |
Mostly anorogenic (Diagram) |
|
Long Batholith (mPlon) |
Mangerite (hypersthene monzonite with or without quartz), granodiorite, monzodiorite (Diagram) |
Calc-alkaline to shoshonitic series (Diagram) |
Mostly ferriferous, calc-alkaline and metaluminous |
14.76 – 29.67 |
7.02 < (La/Yb)N < 18.49 1.99 < (La/Sm)N < 4.95 1.43 < (Gd/Yb)N < 2.49 0.64 < Eu/Eu* < 1.19 (Diagram) |
Mostly anorogenic (Diagram) |
|
Jean-Marie Intrusive Suite (mPijm) |
Quartz syenite with or without hypersthene, alkali feldspar granite, granite with or without hypersthene (Diagram) |
Calc-alkaline enriched in K to shoshonitic series (Diagram) |
Ferriferous, alkaline calc-alkaline, metaluminous to peraluminous |
5.05 – 10.99 |
12.08 < (La/Yb)N < 36.21 3.50 < (La/Sm)N < 6.04 2.70 < (Gd/Yb)N < 2.37 0.48 < Eu/Eu* < 1.33 (Diagram) |
Volcanic arc to intraplate granite (Diagrams)
|
|
Vertu Plutonic Suite (mPvet) mPvet1 mPvet2
|
mPvet 1 Alkali feldspar granite, quartz syenite, syenogranite (Diagram) mPvet2 Alkali feldspar granite, syenogranite, syenite with or without quartz and hypersthene (Diagram) |
mPvet 1 Mostly shoshonitic series mPvet2 Calc-alkaline enriched in K and shoshonitic series |
mPvet1 Ferriferous, mostly alkaline, metaluminous to peraluminous mPvet2 Mostly ferriferous and calc-alkaline to alkaline, metaluminous to peraluminous |
mPvet1 9.93 – 18.88 mPvet2 3.35 – 21.81 |
mPvet1 10.32 < (La/Yb)N < 36.11 2.50 < (La/Sm)N < 7.52 1.97 < (Gd/Yb)N < 2.54 0.45 < Eu/Eu* < 0.80 (Diagram) mPvet2 4.15 < (La/Yb)N < 48.85 1.87 < (La/Sm)N < 10.45 1.31 < (Gd/Yb)N < 2.89 0.30 < Eu/Eu* < 8.10 (Diagram) |
mPvet1 et mPvet2 Volcanic arc to intraplate granite |
|
Sainte-Hedwidge Intrusive Suite (mPshe) |
Quartz syenite, syenogranite, alkali feldspar granite (Diagram) |
Calc-alkaline to shoshonitic series (Diagram) |
Mostly ferriferous, calcic to alkaline, metaluminous to peraluminous |
6.65 – 43.68 |
3.62 < (La/Yb)N < 17.19 1.60 < (La/Sm)N < 3.76 1.36 < (Gd/Yb)N < 2.40 0.36 < Eu/Eu* < 1.28 (Diagram) |
Volcanic arc to intraplate granite (Diagrams) |
|
Festins Plutonic Suite (mPfes) |
Syenite, quartz syenite with or without hypersthene, alkali feldspar granite, mangerite (Diagram) |
Shoshonitic series (Diagram) |
Ferriferous, alkaline, metaluminous to peraluminous |
8.02 – 18.47 |
5.31 < (La/Yb)N < 25.71 2.67 < (La/Sm)N < 6.28 1.21 < (Gd/Yb)N < 2.49 0.41 < Eu/Eu* < 1.38 (Diagram) |
Anorogenic (Diagram) |
|
Adélard Plutonic Suite (mPade) |
Hypersthene granite (charnockite), syenogranite, quartz syenite (Diagram) |
Calc-alkaline enriched in K to shoshonitic series (Diagram) |
Mostly ferriferous, calc-alkaline to alkaline, metaluminous to peraluminous |
6.08 – 19.91 |
3.83 < (La/Yb)N < 32.12 2.17 < (La/Sm)N < 6.15 1.28 < (Gd/Yb)N < 2.14 0.26 < Eu/Eu* < 0.75 (Diagram) |
Mostly anorogenic (Diagram) |
|
Grondin Plutonic Suite (mPgro) |
Alkali feldspar granite, hypersthene granite (charnockite) (Diargram) |
Calc-alkaline enriched in K to shoshonitic series (Diagram) |
Mostly ferriferous, calc-alkaline to calcic, metaluminous to peraluminous |
7.02 – 14.52 |
4.06 < (La/Yb)N < 131.63 2.03 < (La/Sm)N < 13.49 1.36 < (Gd/Yb)N < 3.10 0.66 < Eu/Eu* < 0.95 (Diagram) |
Mostly anorogenic (Diagram) |
|
Associated Sedimentary and Volcanic Rocks |
||||||
| Stratigraphic Unit | Classification | Protolith and Alteration | Mg# | Rare Earths | Tectonic Setting | |
|
Barrois Complex : mPboi4 mPboi4c mPboi4c (volcanic, amphibolite) |
Biotite paragneiss, quartzite, calcsilicate rocks and marble Basalt and amphibolite
|
Sedimentary rocks derived from the upper crust (granodiorite). Generally, metasedimentary rocks are slightly altered. (Diagram) |
mPboi4: 6.64 mPboi4c: 4.60 – 78.79 mPboi4c (volcanic): 39.63 – 50.06 |
mPboi4c (basalt and amphibolite)
2.40 < (La/Yb)N < 6.20 1.69 < (La/Sm)N < 2.08 1.16 < (Gd/Yb)N < 2.04 0.78 < Eu/Eu* < 1.12 (Diagram) |
mPboi4c Volcanic arc (basalt) and E-MORB (amphibolite) tendencies (Diagram) |
|
|
Saint-Onge Supracrustal Sequence (mPong5) mPong6 |
Biotite paragneiss, quartzite, calcsilicate rocks, marble and quartzofeldspathic gneiss Basalt and amphibolite |
mPong5: biotite paragneiss, calcite, scapolite ± wollastonite, quartzite, marble, calcsilicate rocks mPong6 : quartzofeldspathic gneiss (Diagram) |
mPong5 : 6.35 – 55.44 mPong6 : 23 |
mPong5: 1.21 < (La/Yb)N < 184.74 1.48 < (La/Sm)N < 21.37 0.64 < (Gd/Yb)N < 2.26 0.50 < Eu/Eu* < 0.98 Pong6: (La/Yb)N = 6.48 (La/Sm)N = 3.46 (Gd/Yb)N = 1.08 Eu/Eu* =1.17 |
||
|
Saint-Onge Supracrustal Sequence (mPong6) |
Basalt and amphibolite (andesitic) |
– | 26.73 – 42.91 |
1.86 < (La/Yb)N < 5.85 0.86 < (La/Sm)N < 2.21 1.37 < (Gd/Yb)N < 4.46 0.38 < Eu/Eu* < 1.03 (Diagram) |
||
Mafic and Ultramafic Intrusive Rocks
|
Stratigraphic or Lithological Unit |
Lithology |
Affinity |
Mg# |
Rare Earths |
Comments |
|---|---|---|---|---|---|
|
Gabbronorite, Pyroxenite, Carbonatite |
|||||
|
Rivière Noire Intrusion (mPirn) |
Locally alkaline pyroxenite (Diagram) |
Tholeiitic to calc-alkaline (Diagram) |
54.91 – 63.03 |
11.34 < (La/Yb)N < 133.92 2.11 < (La/Sm)N < 3.25
1.89 < (Gd/Yb)N < 19.59
0.87 < Eu/Eu* < 1.01
(Diagram) |
Pyroxenite host to rare earth element and phosphorus mineralization (Aligas mineralized zone) |
|
Tommy Intrusive Suite (mPtmm1 and 3) |
Gabbronorite, leuconorite, Fe-Ti oxides rock |
Mostly tholeiitic (Diagram) |
17.58 – 29.92 |
9.87 < (La/Yb)N < 53.53 1.57 < (La/Sm)N < 3.62 3.11 < (Gd/Yb)N < 6.84 0.81 < Eu/Eu* < 1.69 (Diagram) |
The gabbronorites analyzed are predominantly medium to coarse grained and their chemistry does not really represent the overall composition of the protolith. |
|
Écluse Batholith (mPecl) |
Gabbronorite, gabbronorite with Fe-Ti-P oxides and sulphides, pyroxenite with sulphides |
Mostly tholeiitic (Diagram) |
22.32 – 26.43 |
0.83 < (La/Yb)N < 26.78 0.48 < (La/Sm)N < 2.70 1.59 < (Gd/Yb)N < 6.68 0.69 < Eu/Eu* < 1.06 (Diagram) |
The samples analyzed are predominantly medium to coarse grained, locally porphyroid and their chemistry does not really represent the overall composition of the protolith. They are also enriched in sulphides and iron, titanium and phosphorus oxides. |
|
Long Batholith (mPlon) |
Gabbronorite and pyroxenite |
Mostly tholeiitic (Diagram) |
18.06 – 61.88 |
1.71 < (La/Yb)N < 18.26 1.27 < (La/Sm)N < 3.15
0.81 < (Gd/Yb)N < 3.24
0.46 < Eu/Eu* < 1.03
(Diagram) |
The samples analyzed are predominantly medium to coarse grained, locally porphyroid and their chemistry does not really represent the overall composition of the protolith. |
|
Lac-Saint-Jean Anorthositic Suite (mPlsj) |
Anorthosite, leuconorite, norite, gabbronorite, Fe-Ti±P oxide rocks, ultramafic rock Andesine labradorite-type plagioclase (Diagram) |
–
|
3.40 – 48.67 |
0.25 < (La/Yb)N < 33.95 0.41 < (La/Sm)N < 6.83 0.61 < (Gd/Yb)N < 4.14 0.31 < Eu/Eu* < 13.43 (Diagram) |
The anorthosite and leuconorite samples analyzed are more or less recrystallized. Gabbronorites are coarse grained and contain Fe-Ti-P oxide minerals of varying content. (5-30%).
|
|
Sainte-Hedwidge Intrusive Suite (mPshe) |
Gabbronorite |
Tholeiitic to calc-alkaline (Diagram) |
6.77 – 44.22 |
2.64 < (La/Yb)N < 15.08
1.13 < (La/Sm)N < 2.79
1.23 < (Gd/Yb)N < 2.93
0.36 < Eu/Eu* < 1.39
(Diagram) |
The samples analyzed are predominantly medium to coarse grained, locally porphyroclastic and their chemistry does not really represent the overall composition of the protolith. |
|
Jean-Marie Intrusive Suite (mPijm) |
Gabbronorite |
Tholeiitic (Diagram) |
13.91 |
(La/Yb)N = 4.11
(La/Sm)N = 1.85
(Gd/Yb)N = 1.63
Eu/Eu* = 0.82
(Diagram) |
The sample analyzed is coarse grained and coronitic, and its chemistry does not really represent the overall composition of the protolith. |
|
Festins Plutonic Suite (mPfes) |
Gabbronorite
|
Tholeiitic (Diagram) |
24.86 |
(La/Yb)N = 3.63
(La/Sm)N = 1.58
(Gd/Yb)N = 1.67
Eu/Eu* = 0.90
(Diagram) |
The sample analyzed is medium to coarse grained and its chemistry does not really represent the overall composition of the protolith. |
|
Adélard Plutonic Suite (mPade) |
Gabbronorite |
Tholeiitic (Diagram) |
39.46 |
(La/Yb)N = 5.50
(La/Sm)N = 2.25
(Gd/Yb)N = 1.65
Eu/Eu* = 1.17
(Diagram) |
The sample analyzed is coarse grained and its chemistry does not really represent the overall composition of the protolith. |
|
Grondin Plutonic Suite (mPgro) |
Gabbronorite |
Tholeiitic (Diagram) |
23.64 – 41.87 |
The samples analyzed are predominantly medium to coarse grained and coronitic, and their chemistry does not really represent the overall composition of the protolith. They are also enriched in sulphides and iron and titanium oxides. |
|
Granitic Pegmatite Dykes with REE and Diabase Dykes (very fine grained gabbro)
|
Stratigraphic or Lithological Unit |
Classification |
Affinity |
Type of Magmatism |
Mg# and REEtotal |
Rare Earths |
Tectonic Setting |
Comments |
|---|---|---|---|---|---|---|---|
|
RARE EARTH ELEMENT (REE) MINERALISED ROCKS |
|||||||
|
Pegmatite dykes enriched in rare earth elements and/or Nb, Th |
Alkali feldspar granite, syenogranite
|
Calc-alkaline to shoshonitic series (Diagram) |
Mostly ferriferous, calc-alkaline to alkaline and hyperaluminous |
6.23 < Mg# < 27.83 645.67 ppm < REEtotal < 7214.55 ppm |
1.04 < (La/Yb)N < 202.36 0.84 < (La/Sm)N < 9.34 0.98 < (Gd/Yb)N < 8.23 0.16 < Eu/Eu* < 0.45
(Diagram) |
Anorogenic
(Diagram) |
The samples analyzed are coarse grained to pegmatitic and generally consist of microcline and quartz; they do not reflect the average composition of these rocks. Note that the Tommy Nb mineralized zone is more enriched in heavy REE than light REE. |
|
Carbonatite dyke injected into the Tommy Intrusive Suite |
Calcitic carbonatite (Diagram) |
Sodic and peralkaline (Diagram) |
Does not apply. |
Mg# = 36.79 REEtotal = 2440 ppm |
(La/Yb)N = 17.79
(La/Sm)N = 2.84
(Gd/Yb)N = 3.40
0Eu/Eu* = 0.96
(Diagram) |
Does not apply. |
The carbonatite hosts rare earth element and phosphorus mineralization (Grand Lac Brochet mineralized zone). |
|
Lamprophyre dyke
|
Mafic lamprophyre Very fine to fine grained gabbro |
Lamprophyre: Close to calc-alkaline range (Diagram) Diabase Tholeiitic (Diagram) |
Does not apply. |
Lamprophyre: 25.09 < Mg# < 29.92 405 ppm < REEtotal < 611 ppm Diabase :
22.70 < Mg# < 23.06 648 ppm < REEtotal < 672 ppm |
Lamprophyre:
18.26 < (La/Yb)N < 53.53
3.15 < (La/Sm)N < 3.78
3.24 < (Gd/Yb)N < 6.84
0.82 < Eu/Eu* < 1.17
(Diagram)
Diabase:
26.59 < (La/Yb)N < 25.39
3.32 < (La/Sm)N < 3.39
3.98 < (Gd/Yb)N < 4.09
0.88 < Eu/Eu* < 0.94
(Diagram) |
|
|
References
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