Clinopyroxene Group ABSi 2 O 6 Presented by Joyleen Desai Paul Sandlin.

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Presentation transcript:

Clinopyroxene Group ABSi 2 O 6 Presented by Joyleen Desai Paul Sandlin

DiopsideHedenbergite Jadeite Acmite Spodumene

Chemical Composition ABSi 2 O 6 MineralAB DiopsideCa 2+ Mg 2+ HedenbergiteCa 2+ Fe 2+ JadeiteNa + Al 3+ AcmiteNa + Fe 3+ SpodumeneLi + Al 3+

Structural Cell Parameters Monoclinic Space Group: C2/c Point Group: 2/m Mineralabcρ (calc) Diopside Hedenbergite Jadeite Acmite Spodumene Source:

Structure

Thermal Expansion MineralT Range (°C) α (x °C -1 ) Diopside Hedenbergite Jadeite Acmite Spodumene Source: Cameron et al. (1973)

Compression MineralBulk Modulus (GPa) Shear Modulus (GPa) Diopside Hedenbergite Jadeite Source:

Occurrences Clinopyroxenes are found in mafic and ultramafic igneous rocks They are also found in medium- to high- grade metamorphosed mafic rocks

Metamorphic Facies Source: Spear (1995)

Geothermobarometry Inferring T and P –Thermodynamic modeling and calculations, electron microprobe Assume equilibrium for sub-assemblages Possible to infer PT conditions at various stages in rock history –Can’t find ages, but can construct PT time path

Garnet-Cpx Thermobarometer Source: Spear (1995)

Diopside-Enstatite Geothermometer Below the solvus, a pyroxene of composition X will unmix to produce two pyroxenes The degree of unmixing is a function of temperature Source: Perkins (1998)

Crystal Structure

Hydrous Sodic Cpx in the Upper Mantle Source: Smyth et al. (1991)

Hydrous Importance Cpx in eclogites as mantle samples X-ray crystal structure refinement and analytical transmission electron microscopy (McCormick, 1996) –OH at dominant 3470 cm -1 band O2 site is underbonded according to Pauling bond strength –M2 site is the most likely candidate for OH, ppm by weight Cpx is stable at P=12 GPa, km Cpx is 5-10 times more abundant in mantle rocks