Lithogeochemistry of Geological Units in the Baleine Lithotectonic Domain
The majority of samples in the database were analyzed for major oxides, trace elements and metals. Analyses were performed using different techniques depending on elements, such as inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP-AES) and neutron activation (INAA). For more information on the analysis and dissolution techniques used, refer to the information available for each sample in SIGÉOM à la carte.
Spider and rare earth element diagrams of several units and subunits are grouped together to form envelopes including analyses between the 25th and 75th percentiles of the population. This procedure was chosen to simplify the visualization of a large number of profiles or when profiles of the same unit are similar. The envelopes thus presented are therefore given as an indication.
Archean Gneissic and Intrusive Rocks
Lithodemic Unit |
Classification |
Mg# |
Rare Earths |
Spider Diagram |
---|---|---|---|---|
Felsic and Intermediate Rocks |
||||
Aung2 |
Tonalite and granodiorite (diagrams) |
30.5-53.8 |
Profile with negative slope 15.9 < (La/Yb)N < 74.1 3.9 < (La/Sm)N < 10.6 1.2 < (Gd/Yb)N < 5.1 0.9 < Eu/Eu* < 2.9 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Ti, Sm Positive anomaly in: Lu (diagram) |
Aung2a |
Diorite, quartz diorite and gabbro (diagrams) |
49.9-59.2 |
Profile with slight negative slope 1.6 < (La/Yb)N < 24.9 1.1 < (La/Sm)N < 3.9 1.1 < (Gd/Yb)N < 3.2 0.8 < Eu/Eu* < 1.2 (diagram) |
Profile with slight negative slope Negative anomalies in: Th,Ta, Nb, P, Zr, Hf (diagram) |
Agkx1 |
Tonalite and granodiorite (diagrams) |
36.1-61.7 |
Profile with negative slope 12.3 < (La/Yb)N < 43.9 4.1 < (La/Sm)N < 7.9 1.7 < (Gd/Yb)N < 3.6 0.7 < Eu/Eu* < 2.3 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Ti, Sm (diagram) |
Agkx2 |
Gabbro, monzogabbro and quartz diorite (diagrams) |
43.2-70.8 |
Profile having a negative slope 3.3 < (La/Yb)N < 27.7 2.4 < (La/Sm)N < 3.2 1 < (Gd/Yb)N < 4.5 0.8 < Eu/Eu* < 1.4 (diagram) |
Profile with slight negative slope Negative anomalies in: Th,Ta, Nb, P, Ti Positive anomalies in: Sm, Eu (diagram) |
nAsaf1 |
Granodiorite, quartz monzodiorite, quartz monzonite and granite (diagrams) |
23.7-48.7 |
Profile with negative slope 10.3 < (La/Yb)N < 61.1 2.7 < (La/Sm)N < 10 1.8 < (Gd/Yb)N < 3.8 0.5 < Eu/Eu* < 2.1 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
nAsaf2 |
Granite (diagrams) |
11.8-38.4 |
Profile with negative slope 15.1 < (La/Yb)N < 65.9 6.1< (La/Sm)N < 12 1.2 < (Gd/Yb)N < 3.5 0.4 < Eu/Eu* < 3.4 (diagram) |
Profile with slight negative slope Negative anomalies in: Th, Ta, Nb, P, Ti (diagram) |
Mafic and Ultramafic Rocks |
||||
ApPral1 |
Gabbro, diorite and ultramafic rocks (diagrams) |
29.6-74.6 |
Profile with very slight negative slope 0.7 < (La/Yb)N < 18.5 0.7< (La/Sm)N < 4.8 1 < (Gd/Yb)N < 3.8 0.7 < Eu/Eu* < 1.5 (diagram) |
Flat profile Positive anomalies in: La, Ce, Nd (diagram) |
ApPral2 |
Ultramafic rocks (diagrams) |
71.8-83.1 |
Flat profile 0.4 < (La/Yb)N < 3.8 0.6< (La/Sm)N < 1.4 0.6 < (Gd/Yb)N < 2.3 0.5 < Eu/Eu* < 1.5 (diagram) |
Flat profile Positive anomalies in: Nb, Zr, Ti, Y (diagram) |
Supracrustal Rocks
Lithodemic Unit |
Classification |
Affinity |
Tectonic Setting |
Mg# |
Rare Earths |
Spider Diagram |
Comments |
---|---|---|---|---|---|---|---|
Volcanic and Associated Rocks |
|||||||
nApPcut1 |
Basalt (diagram) |
Tholeiitic to calc-alkaline (diagram) |
Plate margin basalt, N-MORB, E-MORB and calc-alkaline (diagrams) |
32.1-72.4 |
Flat profile 0.8 < (La/Yb)N < 6.5 1.8 < (La/Sm)N < 2.5 1 < (Gd/Yb)N < 2.6 0.8 < Eu/Eu* < 1.4 (diagram) |
Flat profile Negative anomalies in: Ta,Nb, P, Eu, Y (diagram) |
Typical composition of unaltered basalt (diagram) |
Lithodemic Unit |
Classification |
Protolith and Alteration |
Mg# |
Rare Earths |
Spider Diagram |
||
---|---|---|---|---|---|---|---|
Sedimentary Rocks |
|||||||
nApPaki1 |
Metawacke (diagram) |
Sedimentary rocks derived from the upper crust (tonalitic to granodioritic), poorly altered and poorly recycled (diagram) (diagram) |
28.3-44.6 |
Profile with negative slope 10.6 < (La/Yb)N < 29.7 3.1 < (La/Sm)N < 4.6 1.3 < (Gd/Yb)N < 3.9 0.7 < Eu/Eu* < 0.9 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Zr, Hf, Ti (diagram) |
||
nApPaki2 |
Metawacke and meta-arkose (diagram) |
Sedimentary rocks derived from the upper crust (granodioritic), slightly altered and not recycled (diagram) (diagram) |
21.7-59.4 |
Profile with negative slope 4.3 < (La/Yb)N < 36.8 3 < (La/Sm)N < 6.5 0.7 < (Gd/Yb)N < 3.6 0.7 < Eu/Eu* < 1.7 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
||
nApPgy |
Metalitharenite and meta-arkose (diagram) |
Sedimentary rocks derived from the upper crust (granodioritic to granitic), poorly altered and poorly recycled (diagram) (diagram) |
11.6-68.2 |
Profile with negative slope 11.2 < (La/Yb)N < 57.9 3.5 < (La/Sm)N < 9.4 1.4 < (Gd/Yb)N < 4.4 0.7 < Eu/Eu* < 2.2 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Nd, Sm, Ti (diagram) |
||
nApPfas1 |
Migmatized paragneiss |
Heterogeneous composition (diagrams) |
34-51.8 |
Profile with slight negative slope 7.4 < (La/Yb)N < 27.1 3 < (La/Sm)N < 6.4 0.9 < (Gd/Yb)N < 2.6 0.7 < Eu/Eu* < 1.4 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Zr, Ti (diagram) |
||
pPwii1 |
Metatexite |
Heterogeneous composition (diagrams) |
26.5-47.9 |
Profile with slight negative slope 2.3 < (La/Yb)N < 33.9 1.5 < (La/Sm)N < 5.3 1.1 < (Gd/Yb)N < 4.2 0.6 < Eu/Eu* < 1.6 (diagram) |
Profile with slight negative slope Negative anomalies in: Ta, Nb, P, Ti, Yb (diagram) |
||
pPwii2 |
Diatexite |
Heterogeneous composition (diagrams) |
48.3-55.9 |
Profile with negative slope 14.1 < (La/Yb)N < 140 4.2 < (La/Sm)N < 8.5 1.8 < (Gd/Yb)N < 6.9 0.8 < Eu/Eu* < 1.6 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
The major oxide diagrams inspired by Sawyer (2008) illustrate the heterogeneity in the composition of paragneiss and associated diatexites of the False and Winnie suites. The geochemical variability highlighted by these diagrams can be explained by many processes, including heterogeneity in the composition of protoliths, accumulation or extraction of melting products in some samples and contamination by partial melting residues.
Proterozoic Intrusive Rocks
Lithodemic Unit |
Classification |
Affinity |
Tectonic Setting |
Mg# |
Rare Earths |
Spider Diagram |
---|---|---|---|---|---|---|
Felsic and Intermediate Intrusive Rocks |
||||||
pPchm1 |
Granodiorite, quartz monzonite and granite (diagrams) |
Magnesian granitoid, calc-alkaline to alkaline-calcic, type I and metaluminous to hyperaluminous (diagrams) |
Volcanic arc granite (diagrams) |
27.7-50.2 |
Profile with negative slope 14.3 < (La/Yb)N < 48.3 3.2 < (La/Sm)N < 8.2 1.7 < (Gd/Yb)N < 5 0.5 < Eu/Eu* < 1.6 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
pPchm2 |
Granite (diagrams) |
Magnesian to ferriferous granitoid, calc-alkaline to alkaline-calcic, type I and metaluminous to hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
6.2-46.5 |
Profile with negative slope 3.8 < (La/Yb)N < 52.4 2.9 < (La/Sm)N < 6.5 1.1 < (Gd/Yb)N < 4 0.6 < Eu/Eu* < 1.2 (diagram)
|
Profile with negative slope Negative anomalies in: P, Ti Positive anomaly in: Th (diagram) |
pPavn1
|
Tonalite, granodiorite and granite (diagrams) |
Magnesian to ferriferous granitoid, calcic to alkaline-calcic, type I and hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
13.1-43.9 |
Profile with negative slope 1.4 < (La/Yb)N < 145.7 1.8 < (La/Sm)N < 9.8 0.6 < (Gd/Yb)N < 7.8 0.1 < Eu/Eu* < 14.1 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
pPavn1a |
Tonalite and granodiorite (diagrams) |
Magnesian granitoid, calcic, type I and hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
33.6-48.7 |
Profile with negative slope 13.9 < (La/Yb)N < 351.9 5.8 < (La/Sm)N < 10.8 1.6 < (Gd/Yb)N < 12.2 0.5 < Eu/Eu* < 7.2 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Ti (diagram) |
pPdac1 |
Granite et granodiorite (diagrams) |
Magnesian granitoid, alkaline-calcic, type I and hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
23.8-32.4 |
Profile with negative slope 39.1 < (La/Yb)N < 153.4 4 < (La/Sm)N < 7.4 3.5 < (Gd/Yb)N < 8.8 0.1 < Eu/Eu* < 1.1 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Zr, Ti,
(diagram) |
pPdac2 |
Granite and granodiorite (diagrams) |
Magnesian granitoid, alkaline-calcic, type I and hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
9.5-36.8 |
Profile with negative slope 2 < (La/Yb)N < 121.4 1.5 < (La/Sm)N < 8.6 0.8 < (Gd/Yb)N < 7.7 0.3 < Eu/Eu* < 3.8 (diagram) |
Profile with negative slope Negative anomalies in: Ta, Nb, P, Zr, Ti (diagram) |
pPdac3 |
Granite and granodiorite (diagrams) |
Magnesian granitoid, alkaline-calcic, type I and hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
8.8-31.4 |
Profile with steep negative slope 2.3 < (La/Yb)N < 68.7 1.7 < (La/Sm)N < 8.7 0.9 < (Gd/Yb)N < 7 0.2 < Eu/Eu* < 5.4 (diagram) |
Profile with steep negative slope Negative anomalies in: Ta, Nb, P, Zr, Ti (diagram) |
Lithodemic Unit |
Classification |
Affinity |
Tectonic Setting |
Mg# |
Rare Earths |
Spider Diagram |
---|---|---|---|---|---|---|
Intermediate, Mafic and Ultramafic Intrusive Rocks |
||||||
pPlnd1 |
Monzodiorite, diorite and monzogabbro (diagram) |
Magnesian granitoid, alkaline-calcic to calc-alkaline, type I and metaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
44.6-46.9 |
Profile with negative slope 13.8 < (La/Yb)N < 31.6 2.8 < (La/Sm)N < 3.8 2.2 < (Gd/Yb)N < 4.8 0.9 < Eu/Eu* < 1.2 (diagram) |
Profile with slight negative slope Negative anomalies in: Th, Ta, Nb, P, Zr, Hf, Ti (diagram) |
pPlnd2a |
Gabbro, monzogabbro and gabbro-diorite (diagram) |
Calc-alkaline (diagram) (diagram) |
43.8-52.1 |
Profile with negative slope 11.9 < (La/Yb)N < 29 3 < (La/Sm)N < 3.4 2.3 < (Gd/Yb)N < 4.4 0.8 < Eu/Eu* < 1 (diagram) |
Profile with very slight negative slope Negative anomalies in: Th, Nb, Zr, Hf (diagram) |
|
pPlnd2b |
Ultramafic rocks (diagram) |
Tholeiitic (diagram) (diagram) |
73.4-77.3 |
6.9 < (La/Yb)N < 10.5 1 < (La/Sm)N < 2.5 1.1 < (Gd/Yb)N < 5.4 0.5 < Eu/Eu* < 1 (diagram) |
Relatively flat profile Negative anomalies in: Th, Ta, Nb, P, Zr, Hf, Ti (diagram) |
|
pPkaa1 |
Diorite, tonalite, quartz diorite and granodiorite (diagram) |
Magnesian granitoid, calc-alkaline to calcic, type I and metaluminous to hyperaluminous (diagrams) |
Volcanic arc granite (diagram) (diagrams) |
31.4-47.6 |
Profile with negative slope 5.3 < (La/Yb)N < 40 2.8 < (La/Sm)N < 3.8 2.7 < (Gd/Yb)N < 7.1 0.8 < Eu/Eu* < 2.5 (diagram) |
Profile with slight negative slope Negative anomalies in: Th, Ta, Nb, P (diagram) |
pPkaa2 |
Gabbro and ultramafic rocks (diagram) |
Tholeiitic (diagram) (diagram) |
32.3-78.4 |
Relatively flat profile 0.9 < (La/Yb)N < 14.5 0.4 < (La/Sm)N < 5.1 1.2 < (Gd/Yb)N < 2.9 0.7 < Eu/Eu* < 2.4 (diagram) |
Flat profile Negative anomalies in: Th, Nb, Ta, Zr, Hf Positive anomalies in: Sm, Ti (diagram) |
|
pPkaa3a |
Ultramafic rocks and gabbro (diagram) |
Tholeiitic (diagram) (diagram) |
37-79.1 |
Relatively flat profile 2.2 < (La/Yb)N < 10.4 0.9 < (La/Sm)N < 2.8 1.3 < (Gd/Yb)N < 3.8 0.8 < Eu/Eu* < 2.1 (diagram) |
Flat profile Negative anomalies in: Th, Ta, Nb, Zr, Hf Positive anomaly in: Sm (diagram) |
|
mPsoi |
Gabbro, diorite and quartz monzodiorite (diagram) |
Tholeiitic to calc-alkaline (diagram) (diagram) |
44.5-68.8 |
Profile with negative slope 3.8 < (La/Yb)N < 14.8 2.1 < (La/Sm)N < 3.9 1.3 < (Gd/Yb)N < 2.2 0.8 < Eu/Eu* < 1.5 (diagram) |
Profile with slight negative slope Negative anomalies in: Th, Ta, Nb, P, Yb (diagram) |
The diagram of Kempton and Harmon (1992), which uses ratios of elements with very low mobility during metamorphism (Guilmette et al., 2009), allows the evolutionary trends of protoliths of metamorphosed mafic rocks to be determined. Samples of the Kaslac Complex and the Lhande and Soisson suites all fall outside the field of primitive basalts. Three trends concerning different units of the Kaslac Complex have been described by Lamirande and Bilodeau (2018): 1) a decrease in magnesium number for the same SiO2/Al2O3 ratio, indicating the accumulation of Fe-Ti oxides; 2) a concomitant decrease in magnesium number and SiO2/Al2O3 ratio, indicating the accumulation of plagioclase or garnet; and 3) a concomitant increase in magnesium number and SiO2/Al2O3 ratio, indicating the accumulation of pyroxene. These results suggest that the majority of rocks in the Kaslac Complex are cumulates rather than differentiated liquids (Lamirande and Bilodeau, 2018).
References
Publications of the Government of Québec
GODET, A., VANIER, M.-A., GUILMETTE, C., LABROUSSE, L., CHARETTE, B., LAFRANCE, I. 2018. Chemins PT et style d’exhumation du Complexe de Mistinibi, Province du Churchill Sud-Est, Canada. MERN, UNIVERSITE LAVAL, SORBONNE UNIVERSITE. MB 2018-31, 32 pages.
LAMIRANDE, P H., BILODEAU, C. 2018. Géochimie et pétrogenèse des métabasites du Complexe de Kaslac, Nunavik, Québec. Université Laval, MERN; MB 2018-15, 43 pages.
TRÉPANIER, S. 2011. Guide pratique d’utilisation de différentes méthodes de traitement de l’altération et du métasomatisme. CONSOREM. MB 2011-13, 216 pages.
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