Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications

Dunn, Steven R.; Markley, Michelle; Kotikian, Maneh; Achenbach, K. L.; Montanye, Bo; Peck, William H.

doi:10.2138/am-2019-6757

Cited by 10 publications

(3 citation statements)

References 90 publications

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“…However, oxygen isotope ratios in those rocks range from δ 18 O = 16.8% to 24.5% , reflecting pre-metamorphic seafloor hydrothermal systems [34]. Similar isotopic provinciality and the preservation of sedimentary isotope ratios is seen in the Elzevir terrane of Ontario: δ 13 C values of marbles are~3% higher than contemporaneous Grenville marbles in nearby terranes, consistent with restricted basin deposition [35].…”

Section: Comparison To Grenville Marbles In Nearby Terranesmentioning

confidence: 66%

“…The Morin terrane and geologically similar Adirondack Highlands + Lowlands all have large ranges in δ 13 C [36], and carbon isotopes from these three terranes are statistically indistinguishable by t-test. However, carbon isotopes of Grenville marbles in the Elzevir terrane, Frontenac terrane, and Parry Sound domain of Ontario, the Central Metasedimentary Belt of Quebec, and the Franklin marble of New Jersey are statistically distinct from those in the Morin terrane [34,35,[37][38][39]. of sedimentary isotope ratios is seen in the Elzevir terrane of Ontario: δ 13 C values of marbles are ~3‰ higher than contemporaneous Grenville marbles in nearby terranes, consistent with restricted basin deposition [35].…”

Section: Comparison To Grenville Marbles In Nearby Terranesmentioning

confidence: 99%

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The Kilmar Magnesite Deposits: Evaporitic Metasediments in the Grenville Supergroup, Morin Terrane, Quebec

Peck

Eppich

2019

Minerals

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Mesoproterozoic magnesite deposits are found associated with dolomitic marble and intercalated with metasedimentary rocks of the Grenville Supergroup in the granulite facies Morin terrane (Grenville Province, Quebec). This study examines one of the remaining ore deposits exposed on the surface (at the Dobbie mine), and presents stable isotope and mineralogical data for a marine evaporitic origin. The magnesite ore zone has δ18O(Mag) = 25.5 ± 0.4‰ (VSMOW) and δ13C(Mag) = 1.7 ± 0.2‰ (VPDB; n = 7), while surrounding dolomitic marble has δ18O(Dol) = 24.2 ± 0.6‰ and δ13C(Dol) = −0.2 ± 0.7‰ (n = 11). These values are at the high end of the range for other Morin terrane marbles, and this and sharp transitions in stable isotope ratios between lithologies argue for preservation of evaporitic enrichment in δ18O and δ13C. Boron isotope ratios (δ11B = 15.5‰ to 22.7‰) are also consistent with a marine evaporite origin. Identifying evaporitic protoliths in metasedimentary rocks is important for determining pre-metamorphic depositional environments, and in this case links the sedimentary setting of the Morin terrane to the Adirondack Lowlands (New York, NY, USA). The identification of the Kilmar magnesite deposits as evaporitic also has implications for the formation of sedimentary exhalative base metal deposits in the Grenville Supergroup.

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Section: Comparison To Grenville Marbles In Nearby Terranesmentioning

confidence: 66%

Section: Comparison To Grenville Marbles In Nearby Terranesmentioning

confidence: 99%

The Kilmar Magnesite Deposits: Evaporitic Metasediments in the Grenville Supergroup, Morin Terrane, Quebec

Peck

Eppich

2019

Minerals

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“…Later, Anovitz and Essene (1990) proposed pressure conditions of 0.72 ± 0.05 GPa for this unit, obtained using the GASP geobarometer (see sample HAL 83C 38). Calcite-graphite carbon isotope thermometry on surrounding marbles revealed a maximal temperature between 661 and 705°C (Dunn et al, 2019). Markley, Dunn, Jercinovic, Peck, and Williams (2018) reported U-Pb ages for monazite from the same outcrop (see sample West Guilford HA13).…”

Section: Sample Hal104mentioning

confidence: 99%

Iterative thermodynamic modelling—Part 1: A theoretical scoring technique and a computer program (Bingo‐Antidote)

Duesterhoeft

Lanari

2020

Journal Metamorphic Geology

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Identification of Multiple Thermal Events in High‐Grade Metacarbonate Rocks Using Carbon Isotope Thermometry: An Example From the Sør Rondane Mountains, East Antarctica

Satish‐Kumar,

Kiran,

Higashino

et al. 2024

Geological Journal

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Nine metacarbonate layers from the regionally metamorphosed terrane of the Sør Rondane Mountains in the Eastern Dronning Maud Land in East Antarctica were examined in detail for constraining the thermal events using carbon isotope exchange between dolomite/calcite and graphite. Equilibrium carbon isotope fractionation between dolomite and graphite suggested peak metamorphic temperature conditions reaching up to 802°C ± 29°C were estimated at the Balchenfjella locality, where multiple samples from six thick layers of metacarbonate rocks were examined. However, some of the samples exhibit lower carbon isotope fractionation reflecting the possibility of ultrahigh‐temperature metamorphic conditions, which is consistent with recent reports. Furthermore, several metacarbonate rock samples display large variations in δ13CVPDB values for graphite grains, despite dolomite and calcite showing homogeneous carbon and oxygen isotopic composition indicating signatures of retrograde metamorphism and fluid infiltration events. Detailed textural observation suggested alteration of δ13CVPDB values of graphite during retrograde metamorphism might have resulted due to the overgrowth of graphite crystals by the infiltration of low δ13CVPDB‐bearing fluids, the extent of alteration being a direct function of the fluid–rock ratio. Field evidence indicates the presence of carbonate veins cutting across the metacarbonate rocks suggesting that carbon isotope thermometry can also be utilised to understand the effect of external fluid infiltration. At Perlebandet locality the metamorphic temperature conditions were estimated to be around 915°C, whereas those from Tanngarden and Menipa gave lower temperature estimates. Detailed textural analysis of graphite in combination with isotopic composition provided clear evidence for retrograde events. Thus, our results provide tight constraints of peak and post‐peak metamorphic temperature conditions and a regional thermal structure for the Sør Rondane Mountains and further testify the usefulness of carbon isotope thermometry in polymetamorphic terrains.

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Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications

Cited by 10 publications

References 90 publications

The Kilmar Magnesite Deposits: Evaporitic Metasediments in the Grenville Supergroup, Morin Terrane, Quebec

The Kilmar Magnesite Deposits: Evaporitic Metasediments in the Grenville Supergroup, Morin Terrane, Quebec

Iterative thermodynamic modelling—Part 1: A theoretical scoring technique and a computer program (Bingo‐Antidote)

Identification of Multiple Thermal Events in High‐Grade Metacarbonate Rocks Using Carbon Isotope Thermometry: An Example From the Sør Rondane Mountains, East Antarctica

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