Lithogeochemistry of Geological Units in the Sirmiq Lake Area
The tables below summarize the lithogeochemical characteristics of geological units in the Sirmiq Lake area. These units are described in the Geological Bulletin covering this territory and in the Quebec Stratigraphic Lexicon. The 202 analyses used here come from samples collected during the Ministère‘s mapping campaign in the summer of 2019. They were selected based on 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.
Analyses were subject to an internal and laboratory quality assurance and control process. Thus, to ensure the accuracy and precision of the values provided by the laboratory, the Bureau de la connaissance géoscientifique du Québec (BCGQ) regularly inserts blanks, standards and duplicates. Reference materials represent ~10% of the analyses.
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 optical 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.
Rare earth element profiles of several units and subunits are grouped together to form envelopes containing the 25th and 75th percentiles of the population. This procedure was chosen to simplify the visualization of a large number of profiles as well as when the profiles of the same unit are similar. The envelopes presented are therefore indicative. Rare earth elements are normalized according to the chondrite values of Palme and O’Neill (2004).
Intrusive Rocks of the Narsajuaq Lithotectonic Domain
|
Stratigraphic Unit |
Classification |
Affinity |
Rare Earths |
|---|---|---|---|
|
Felsic to Intermediate Intrusive Rocks |
|||
|
Sainte-Hélène Complex (Ashn1) |
Quartz diorite |
Magnesian, calc-alkaline to calcic and metaluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Sainte-Hélène Complex (Ashn2 and Ashn2a) |
Tonalite |
Magnesian, generally calcic and metaluminous to peraluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Sainte-Hélène Complex (Ashn4) |
Quartz monzonite and quartz monzodiorite |
Magnesian, calc-alkaline to alkaline-calcic and metaluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Estre Complex (ApPete1 and ApPete2) |
Tonalite and granodiorite |
Magnesian, calcic to calc-alkaline and metaluminous to peraluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Fargues Suite (ApPfag2) |
Quartz monzonite and quartz syenite |
Ferriferous, alkaline to alkaline-calcic and metaluminous to peraluminous (type I) |
Profile with negative slope (Diagram) |
|
Fargues Suite (ApPfag3) |
Monzonite |
Magnesian, alkaline-calcic to alkaline and metaluminous (type I) |
Profile with negative slope (Diagram) |
|
Navvaataaq Suite (nAnav1) |
Enderbite |
Generally magnesian, calcic and metaluminous to peraluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Navvaataaq Suite (nAnav1a) |
Granite and granodiorite |
Magnesian to ferriferous, calc-alkaline to calcic and metaluminous to peraluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Frichet Suite (pPfri1) |
Monzonite and monzodiorite |
Ferriferous to magnesian, alkaline-calcic and metaluminous (type I) granitoid |
Profile with slight negative slope (Diagram) |
|
Sanningajualuk Suite (pPsnn1) |
Granite |
Ferriferous, alkaline-calcic to calc-alkaline and peraluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Stratigraphic Unit |
Classification |
Rare Earths |
|---|---|---|
|
Mafic and Ultramafic Intrusive Rocks |
||
|
Pingasualuit Complex (nApgs1) |
Mostly gabbro, gabbronorite and gabbro-diorite (Diagram) |
Profile with slight negative slope (Diagram) |
|
Pingasualuit Complex (nApgs1a) |
Mostly gabbro (Diagram) |
Flat profile or with slight negative slope (Diagram) |
|
Pingasualuit Complex (nApgs1b) |
Gabbro and monzogabbro (Diagram) |
Flat profile or with slight negative slope (Diagram) |
|
Pingasualuit Complex (nApgs2) |
Mostly gabbro-diorite, diorite and quartz diorite (Diagram) |
Profile with negative slope (Diagram) |
|
Pingasualuit Complex (nApgs3) |
Gabbro, gabbronorite and ultramafic rocks (Diagram) |
Flat profile (Diagram) |
|
Pingasualuit Complex (nApgs4) |
Ultramafic rocks and gabbronorite (Diagram) |
Profile with slight negative slope (Diagram) |
|
Pingasualuit Complex (nApgs5) |
Mostly gabbro, gabbro-diorite and monzodiorite (Diagram) |
Profile with negative slope (Diagram) |
|
Sainte-Hélène Complex (mafic and intermediate layers) |
Monzogabbro, monzodiorite and gabbro (Diagram) |
Profile with negative slope (Diagram) |
|
Fargues Suite (ApPfag1) |
Alkali gabbro and ultramafic rocks (Diagram) |
Profile with negative slope (Diagram) |
Roches intrusives du Domaine lithotectonique de Kovik
|
Stratigraphic Unit |
Classification |
Affinity |
Rare Earths |
|---|---|---|---|
|
Felsic to Intermediate Intrusive Rocks |
|||
|
Gastrin Suite (ApPgan3) |
Mostly monzonite and monzogabbro |
Mostly magnesian, alkaline-calcic to calc-alkaline and metaluminous (type I) granitoid |
Profile with slight negative slope (Diagram) |
|
Gastrin Suite (ApPgan4) |
Mostly monzonite, monzogabbro and gabbro-diorite |
Magnesian, calc-alkaline to alkaline-calcic and metaluminous (type I) granitoid |
Profile with negative slope (Diagram) |
|
Nunataq Suite (pPnat1) |
Granite and granodiorite |
Magnesian to ferriferous, mostly calc-alkaline and peraluminous (type I) granitoid |
Profile with steep negative slope (Diagram) |
|
Stratigraphic Unit |
Classification |
Rare Earths |
|---|---|---|
|
Mafic and Ultramafic Intrusive Rocks |
||
|
Gastrin Suite (ApPgan1) |
Ultramafic rocks |
Flat profile or with slight negative slope (Diagram) |
|
Gastrin Suite (ApPgan2) |
Gabbro |
Flat profile or with slight negative slope (Diagram) |
References
Publications of the Government of Québec
VANIER, M. A., LAFRANCE, I. 2020. Géologie de la région du lac Sirmiq, Orogène de l’Ungava, Nunavik, Québec, Canada. MERN. BG 2020-02, 1 plan.
Other Publications
DEBON, F., LEFORT, P. 1983. A chemical-mineralogical classification of common plutonic rocks and associations. Transactions of the Royal Society of Edinburgh, Earth Sciences; volume 73, pages 135-149. doi.org/10.1017/S0263593300010117
DE LA ROCHE, H., LETERRIER, J., GRANDCLAUDE, P., MARCHAL, M. 1980. A classification of volcanic and plutonic rocks using R1-R2 diagrams and major element analyses – its relationships with current nomenclature. Chemical Geology; volume 29, pages 183-210. doi.org/10.1016/0009-2541(80)90020-0
FROST, B.R., BARNES, C.G., COLLINS, W.J., ARCULUS, R.J., ELLIS, D.J., Frost, C.D. 2001. A geochemical classification for granitic rocks. Journal of Petrology; volume 12, number 11, pages 2033-2048. doi.org/10.1093/petrology/42.11.2033
MANIAR, P.D., PICCOLI, P.M. 1989 – Tectonic discrimination of granitoids. Geological Society of America Bulletin; volume 101, pages 635-643. doi.org/10.1130/0016-7606(1989)101<0635:TDOG>2.3.CO;2
PALME, H. – O’NEILL, H.S.C. 2004. Cosmochemical estimates of mantle composition. In Treatise on Geochemistry. (Holland, H.D. and Turrekian, K.K. editors), Elsevier, Amsterdam, The Netherlands; volume 2, pages 1-38. doi.org/10.1016/B978-0-08-095975-7.00201-1