Petrogenesis of the Wathaman batholith and La Ronge domain plutons in the Reindeer Lake area, Trans-Hudson Orogen, Saskatchewan
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Bibliographic record
Abstract
The Paleoproterozoic Wathaman Batholith forms a major part of the Trans Hudson Orogen in northern Saskatchewan and Manitoba. On Reindeer Lake in Saskatchewan the batholith is 125 km wide and may continue for 800-900 km along strike. The size is comparable to Phanerozoic batholiths associated with destructive continental margins. The plutonism took place over a relatively short time interval, between 1865 and 1850 Ma. -- The batholith and satellite intrusions have been divided into 3 major zones based on modal, geochemical and Nd isotopic composition, from south to north these are the: La Ronge Domain (LRD); South Central (SCZ); and North East (NEZ). The LRD hosts satellite intrusions that are mainly metaluminous, calc-alkaline tonalites and granodiorites. εNd(t) in this zone ranges from +4.8 to -0.4. The SCZ is composed of two distinct series, a K-feldspar megacrystic granodiorite and a monzogranite series. The granodioritic series range in εNd(t) from -2.3 to -5.4; whilst the monzogranite series are characterized by εNd(t) +0.2 to -0.4. These rocks are all of high-K calc-alkaline affinity. The NEZ is composed of a K-feldspar megacrystic monzogranite and a monzonitic series, both of shoshonitic affinity. The monzogranites rocks have εNd(t) of -1.4 to -6.9, while the monzonites have εNd(t) of -0.3 to -4. -- The Wathaman Batholith had been interpreted as the root of a continental arc but was enigmatic in that it lacked co-magmatic mafic phases and was considered too homogeneous, too felsic, and too megacrystic, i.e., more like post-collisional granitoids. This study has resolved many of the uncertainties in the origin of this batholith. There is a greater diversity of rock types than previously described, and good field evidence for mingling of mafic and felsic magmas. Within a series εNd(t) is independent of rock type, and both the SC and NE zones rocks are characterized by high Sr and Ba. The petrogenesis of the batholith can be explained by mixing between 3 end-members: Archean crust; Proterozoic supra-subduction zone depleted mantle; and a late Archean enriched lithospheric mantle. Relative contributions from end-members change from south to north, with a major role for depleted, subduction zone affected mantle in the LRD; enriched mantle in the SCZ; and enriched mantle + crust in the NEZ. The batholith is interpreted to have formed in a subduction zone setting where mixing was dominantiy occurring in the asthenosphere and at the crust-mantle boundary. Upper level contamination processes can only be clearly seen in the NEZ.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it