Experimental determination of the diffusion coefficient for calcium in olivine between 900°C and 1500°C

Coogan, L. A.; Hain, A.; Ståhl, Sten; Chakraborty, Sumit

doi:10.1016/j.gca.2005.03.002

Cited by 135 publications

(72 citation statements)

References 18 publications

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“…An estimate of the minimum time it would take to homogenise the crystal with respect to Fe-Mg and Ca at magmatic temperatures can be obtained from the characteristic diffusion length (x0(Dt) 1/2 ; where x0distance, D0diffusivity, t0time) of each element of interest. Diffusion coefficients for Ca and Fe-Mg, parallel to the c-axis, were calculated using the models of Coogan et al (2005), and at a magmatic temperature of 1,170°C and an oxygen fugacity equivalent to the QFM buffer. For a typical 200-μm olivine crystal, Fe-Mg would have homogenised in approximately 0.2 years, and Ca in 10 years, providing a minimum estimate for the residence time of a crystal within this magma.…”

Section: Trace Element Systematicsmentioning

confidence: 99%

Integrated field, satellite and petrological observations of the November 2010 eruption of Erta Ale

et al. 2012

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Erta Ale volcano, Ethiopia, erupted in November 2010, emplacing new lava flows on the main crater floor, the first such eruption from the southern pit into the main crater since 1973, and the first eruption at this remote volcano in the modern satellite age. For many decades, Erta Ale has contained a persistently active lava lake which is ordinarily confined, several tens of metres below the level of the main crater, within the southern pit. We combine on-the-ground field observations with multispectral imaging from the SEV-IRI satellite to reconstruct the entire eruptive episode beginning on 11 November and ending prior to 14 December 2010. A period of quiescence occurred between 14 and 19 November. The main eruptive activity developed between 19 and 22 November, finally subsiding to pre-eruptive levels between 8 and 15 December. The estimated total volume of lava erupted is ∼0.006 km 3 . The mineralogy of the 2010 lava is plagioclase+clinopyroxene+olivine. Geochemically, the lava is slightly more mafic than previously erupted lava lining the caldera floor, but lies within the range of historical lavas from Erta Ale. SIMS analysis of olivine-hosted melt inclusions shows the Erta Ale lavas to be relatively volatile-poor, with H 2 O contents ≤1,300 ppm and CO 2 contents of ≤200 ppm. Incompatible trace and volatile element systematics of melt inclusions show, however, that the November 2010 lavas were volatile-saturated, and that degassing and crystallisation occurred concomitantly. Volatile saturation pressures are in the range 7-42 MPa, indicating shallow crystallisation. Calculated pre-eruption and melt inclusion entrapment temperatures from mineral/liquid thermometers are ∼1,150°C, consistent with previously published field measurements.

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Section: Trace Element Systematicsmentioning

confidence: 99%

Integrated field, satellite and petrological observations of the November 2010 eruption of Erta Ale

et al. 2012

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“…Recent petrological studies of the Oman ophiolite and Hole 504B have developed techniques for estimating the cooling rates of dikes and gabbros (Coogan et al, 2005a(Coogan et al, , 2002(Coogan et al, , 2005bVanTongeren et al, 2008). The Ca in olivine geospeedometer developed and refined by Coogan and others will allow the robust estimation of vertical variations in cooling rate that are sensitive enough to identify departures from conductive cooling profiles.…”

Section: Is the Plutonic Crust Cooled By Conduction Or Hydrothermal Cmentioning

confidence: 99%

Expedition 335 summary

Teagle¹,

Ildefonse²,

Blum³

et al. 2012

Proceedings of the IODP

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“…Other authors have found slightly different values for n: ∼ 1/5.8 (Buening and Buseck, 1973), ∼ 1/3.2, ∼ 1/5 and ∼ 1/4.5 for Mg, Fe and Mn respectively (Jurewicz and Watson, 1988) (note that for Fe diffusion along the a axis, these authors found n = −0.18), 1/4.25 (Petry et al, 2004) and found n between 1/5 and 1/7 (these authors also found that at low temperature and/or f O 2 < 10 −15 atm, n becomes much smaller). For Ca diffusion, for which we only have 2 data sets available, we chose n = 1/3.2 (Coogan et al, 2005) whereas Jurewicz and Watson (1988) found n ≃ 1/4.5.…”

Section: The Diffusion Datamentioning

confidence: 99%

Cooling rate of chondrules in ordinary chondrites revisited by a new geospeedometer based on the compensation rule

Béjina¹,

Sautter²,

Jaoul³

2009

Physics of the Earth and Planetary Interiors

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To cite this version:Frédéric Béjina, Violaine Sautter, Olivier Jaoul. Cooling rate of chondrules in ordinary chondrites revisited by a new geospeedometer based on the compensation rule. Physics of the Earth and Planetary Interiors, Elsevier, 2008, 172 (1-2) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 We test a new geospeemetry approach, based on this rule, on cooling of chondrules in chondrites, Sahara-97210 LL 3.2 and Wells LL 3.3. Greeney and Ruzicka (2004) matched Fe-Mg diffusion profiles in olivine from these chondrites with cooling rates between 200-6000 K/hr. In our geospeedometry model, the use of the compensation rule greatly reduces the uncertainties by avoiding the choice of one diffusion coefficient among many. The cooling rates we found are between 700-3600 K/hr for Sahara and 700-1600 K/hr for Wells. Finally, we discuss the influence of our analytical model parameters on our cooling rate estimates.

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Experimental determination of the diffusion coefficient for calcium in olivine between 900°C and 1500°C

Cited by 135 publications

References 18 publications

Integrated field, satellite and petrological observations of the November 2010 eruption of Erta Ale

Integrated field, satellite and petrological observations of the November 2010 eruption of Erta Ale

Expedition 335 summary

Cooling rate of chondrules in ordinary chondrites revisited by a new geospeedometer based on the compensation rule

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