The mutual solubility of coexisting ortho- and clinopyroxene: toward an absolute geothermometer for the natural system?

Bertrand, Philippe; Mercier, J.

doi:10.1016/0012-821x(85)90152-9

Cited by 272 publications

(150 citation statements)

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“…Application of the geotherrnometer based on the enstatite-diopside solvus (Bertrand and Mercier 1985) in the Gabbronorite Unit yields consistent values between 940 and 1,120 D C. For these temperatures, the pyroxene geobarometry (Nimis 1999) indicates pressures of 4.3 to 5.7 kbar. P T values recorded here probably correspond to those of the differentiating magma chamber that underlies the Santa Olalla Plutonic Complex (see below).…”

Section: The Aguablanca Stockmentioning

confidence: 88%

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

et al. 2006

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Section: The Aguablanca Stockmentioning

confidence: 88%

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

et al. 2006

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“…In the absence of orthopyroxene recovery from mineral separates, calculations using the opx-cpx solvus thermometer (Bertrand and Mercier 1985) have been made assuming that equilibrium orthopyroxene is end-member MgSiO 3 enstatite -providing minimum temperature estimates. Results show (Fig.…”

Section: Mineral Chemistrymentioning

confidence: 99%

The mantle of Scotland viewed through the Glen Gollaidh aillikite

Hutchison¹,

Faithfull

Barfod

et al. 2018

Miner Petrol

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The Glen Gollaidh aillikite dyke (58.36741°N 4.69751°W), N.W. Scotland, occurs within the Neoproterozoic sedimentary rocks of the Moine Supergroup~4 km east of the Moine Thrust. Phlogopite 40 Ar/ 36 Ar measurements give a late Devonian maximum emplacement age of 360.3 ± 4.9 (2σ) Ma. This age occurs in a quiet period of Scottish magmatic history c. 30 Ma after the closure of the Iapetus and before the start of intra-plate alkali magmatism which affected southern Scotland for~60 My from c. 350 Ma. Abundant chromites and Cr-diopsides and a few unaltered olivines, reflecting a mantle provenance, were recovered from heavy mineral concentrates. The North Atlantic Craton, exposed in Lewisian gneisses west of the Moine thrust, is therefore inferred to extend east at depth under Glen Gollaidh, presenting an opportunity to investigate the thickness and composition of the cratonic margin in the Devonian. The aillikite was found to be barren of diamond and no picro-ilmenites or garnets were definitively identified. However, mineral chemistry suggests that a proportion of Glen Gollaidh xenocrysts crystallised in equilibrium with garnet. Most spinels are Mg, Al chromites, with some Mg chromite present. All fall within the garnet peridotite field based on Ti and Cr but with insufficient Cr 2 O 3 (up to 47.2 wt%) to be consistent with the diamond stability field. Amongst Cr-diopsides 30% of grains have Cr and Al contents consistent with derivation from garnet peridotite. The majority of clinopyroxenes also show a marked depletion in heavy compared to light rare-earth elements, again consistent with equilibration with garnet. The opx-cpx solvus thermometer demonstrates that average Cr-diopside compositions require at least 37 kbar to give a temperature (979°C) lying even on a relatively warm 40 mWm −2 geotherm (Hasterok and Chapman Earth Planet Sc Lett 307:59-70, 2011). Large variations in the chemistry of mantle minerals reflect a complex history of metasomatism akin to constituents of alkali igneous rocks elsewhere in the Hebridean and Northern Highlands Terranes. Fertilised mantle provided the conditions for generation of aillikite melts, probably triggered by break-off of the advancing Avalonia slab. The cratonic root underlying the Glen Gollaidh aillikite during the late Devonian was apparently too thin to lie within the diamond stability field, consistent with xenoliths from alkali basalts further south. Nonetheless, sufficient geophysical and mineral chemical evidence supports Glen Gollaidh aillikite sitting close to the edge of diamond-prospective mantle therefore suggesting diamond potential a short distance to the west within the Lewisian and what is now East Greenland. (2018) 112 (Suppl 1):S115-S132

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“…(1) 양휘석 지온계 (Wells, 1977;Bertrand and Mercier, 1985;Brey and Köhler, 1990 (Sun and McDonough, 1989), for clinopyroxenes separated from peridotite xenoliths. Data sources: Arai et al, 2001;Choi et al, 2002Kil, 2006Kil, , 2007Shin et al, 2006.…”

Section: 첨정석 페리도타이트의 광물조합에 적용할 수 있는 지온계는 매우 다양하다 보편적으로 이용되는 것에는mentioning

confidence: 99%

Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

Choi¹

2012

The Journal of the Petrological Society of Korea

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Peridotite xenoliths hosted by alkali basalts from South Korea occur in Baengnyeong Island, Jeju Island, Boeun, Asan, Pyeongtaek and Ganseong areas. K-Ar whole-rock ages of the basaltic rocks range from 0.1 to 18.9 Ma. The peridotites are dominantly lherzolites and magnesian harzburgites, and the constituent minerals are Fo-rich olivine (Fo 88.4-92.0 ), En-rich orthopyroxene, Di-rich clinopyroxene, and Crrich spinel (Cr# = 7.8-53.6). Hydrous minerals, such as pargasite and phlogopite, or garnet have not been reported yet. The Korean peridotites are residues after variable degree of partial melting (up to 26%) and melt extraction from fertile MORB mantle. However, some samples (usually refractory harzburgites) exhibit metasomatic enrichment of the highly incompatible elements, such as LREE. Equilibration temperatures estimated using two-pyroxene geothermometry range from ca. 850 to 1050 o C. Sr and Nd isotopic compositions in clinopyroxene separates from the Korean peridotites show trends between depleted MORB-like mantle (DMM) and bulk silicate earth (BSE), which can be explained by secondary metasomatic overprinting of a precursor time-integrated depleted mantle. The Korean peridotite clinopyroxenes define mixing trends between DMM and EM2 end members on Sr-Pb and Nd-Pb isotopic correlation diagrams, without any corresponding changes in the basement. This is contrary to what we

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The mutual solubility of coexisting ortho- and clinopyroxene: toward an absolute geothermometer for the natural system?

Cited by 272 publications

References 22 publications

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

The mantle of Scotland viewed through the Glen Gollaidh aillikite

Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

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