Mantle-derived noble gases in carbonatites

Sasada, Tomohei; Hiyagon, H.; Bell, Keith; Ebihara, Mitsuru

doi:10.1016/s0016-7037(97)00202-0

Cited by 58 publications

(37 citation statements)

References 31 publications

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“…The Nyquist et al (1995) and Wadhwa andLugmair (1996, 1997) An apatite extracted from an alkaline rock of Prairie Lake circular complex in Ontario, Canadian Shield, PRAP, with age of 1155 ± 20 Ma (Sano et al, 2006a) was used as the standard apatite. The average U concentration of PRAP is 196 ppm (Sasada et al, 1997). The U-Pb dating was conducted using a NanoSIMS 50 installed at the Atmosphere and Ocean Pb and 207 Pb with mass resolution of approx.…”

Section: Introductionmentioning

confidence: 99%

High-spatial resolution U-Pb dating of phosphate minerals in Martian meteorite Allan Hills 84001

et al. 2014

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Section: Introductionmentioning

confidence: 99%

High-spatial resolution U-Pb dating of phosphate minerals in Martian meteorite Allan Hills 84001

et al. 2014

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“…Carbonatite is an igneous rock containing 450% magmatic carbonate minerals that occurs on all continents, from the Archean to the present day 1 , and derives from carbonate-rich magmas in the upper mantle [2][3][4] . Kimberlite is another carbonate-rich magma, typically intruded into the crust of ancient and stable cratons [5][6][7] .…”

mentioning

confidence: 99%

“…One study reported viscosity of a melt with 70 wt.% CaCO 3 uncertainties. An in-situ viscosity measurement using synchrotron X-ray radiography was carried out for potassium carbonate melts (K 2 Mg(CO 3 ) 2 and K 2 Ca(CO 3 ) 2 ) in ref. 27.…”

mentioning

confidence: 99%

Ultralow viscosity of carbonate melts at high pressures

et al. 2014

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Knowledge of the occurrence and mobility of carbonate-rich melts in the Earth's mantle is important for understanding the deep carbon cycle and related geochemical and geophysical processes. However, our understanding of the mobility of carbonate-rich melts remains poor. Here we report viscosities of carbonate melts up to 6.2 GPa using a newly developed technique of ultrafast synchrotron X-ray imaging. These carbonate melts display ultralow viscosities, much lower than previously thought, in the range of 0.006-0.010 Pa s, which are B2 to 3 orders of magnitude lower than those of basaltic melts in the upper mantle. As a result, the mobility of carbonate melts (defined as the ratio of melt-solid density contrast to melt viscosity) is B2 to 3 orders of magnitude higher than that of basaltic melts. Such high mobility has significant influence on several magmatic processes, such as fast melt migration and effective melt extraction beneath mid-ocean ridges.

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“…In Brazil, only two occurrences have so far been investigated: Lower Cretaceous Jacupiranga calciocarbonatites for forsterite and apatite, and Upper Cretaceous Tapira calciocarbonatites for apatite. Analytical data for Ar, Xe, Kr, Ne, and He is presented in Sasada et al (1997) and discussed in a review paper by Comin-Chiaramonti et al (2007a). A summary provided by the latter authors suggests that: (Hart 1984); Th, Paraná tholeiites; WR, Walvis Ridge; 132 Ma geochron according to Ewart et al (2004).…”

Section: Noble Gasesmentioning

confidence: 99%