2017
DOI: 10.1130/g38801.1
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A common origin of carbonatite magmas

Abstract: The more than 500 fossil Ca-carbonatite occurrences on Earth are at odds with the only active East African Rift carbonatite volcano, Oldoinyo Lengai (Tanzania), which produces Na-carbonatite magmas. The volcano's recent major explosive eruptions yielded a mix of nephelinitic and carbonatite melts, supporting the hypothesis that carbonatites and spatially associated peralkaline silicate lavas are related through liquid immiscibility. Nevertheless, previous eruption temperatures of Na-carbonatites were 490-595 °… Show more

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Cited by 110 publications
(57 citation statements)
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“…This enrichment has been attributed to very small degrees of partial melting (e.g Bell and Tilton, 2002;Gibson et al, 2006) or enrichment during carbonatite-silicate liquid immiscibility (e.g. Weidendorfer et al, 2017). REE concentrations from the Guli carbonatites range across an order of magnitude ( Figure 7A).…”
Section: Resultsmentioning
confidence: 99%
“…This enrichment has been attributed to very small degrees of partial melting (e.g Bell and Tilton, 2002;Gibson et al, 2006) or enrichment during carbonatite-silicate liquid immiscibility (e.g. Weidendorfer et al, 2017). REE concentrations from the Guli carbonatites range across an order of magnitude ( Figure 7A).…”
Section: Resultsmentioning
confidence: 99%
“…By analogy to experimental work on carbonatite systems by Weidendorfer et al, (2017) it is likely that the temperature of the magmatic stage of the Okorusu carbonatites was between 700 °C and 1050 °C, although late-magmatic stage 2 crystallisation may have been somewhat cooler. Bühn et al, (2002) The Mg content of calcite coexisting with dolomite is the basis for the calcite-dolomite solvus geothermometer calibrated by Anovitz and Essene (1987).…”
Section: Conditions Of Ree Mineralisation and Hydrothermal Reworkingmentioning
confidence: 99%
“…This is also the brightest region in BSE seen in the monazite (Figure 2). We speculate that the higher % common Pb reported for the Llallagua monazite is likely due to the small amounts of radiogenic elements present in the mineral, and thus a lower amount of detectable radiogenic Pb (average 208 Pb is 0.5 ± 0.2 ppm) (see also [11]). Other approaches (Secondary Ion Mass Spectrometry) may be able to detect common Pb, and confirm this hypothesis.…”
Section: Llallagua Monazite La-icp-ms Analysesmentioning
confidence: 99%
“…All spots were pre-ablated for 2 s using a 75 μm spot, 20% laser power, and 10 Hz repletion rate to remove surface contamination (i.e., EPMA carbon coat). The quadrupole time-resolved method involved measurement of 22 analytes at one point per spectral peak, using the integration times of 10 ms ( 31 P and 89 Y), 20 ms ( 23 Na, 27 Al, 47 Ti, 55 Mn, 57 Fe, 75 As, 137 Ba, 153 Eu, 157 Gd, 159 Tb, 163 Dy, 165 Ho, 166 Er, 169 Tm, 172 Yb, and 175 Lu) or 30 ms ( 204 Pb, 208 Pb, 232 Th, and 238 U). The resulting sampling period (0.5062 s) corresponded to >90% detection time, enabling 118 measurements to be made within the dwell interval (60 s), conditions suitable for robust measurement [32].…”
Section: Llallagua Monazite La-icp-ms Analysesmentioning
confidence: 99%
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