Orthocumulates

Orthocumulates form when the intercumulus liquid is compositionally different from earlier formed cumulate crystals and precipitates different intercumulus minerals. There is little or no exchange between the intercumulus liquid and the main chamber.

orhocumulates.jpg

Orthocumulate: intercumulus liquid crystallizes to form additional plagioclase rims plus other phases in the interstitial volume (colored). There is little or no exchange between the intercumulus liquid and the main chamber. After Wager and Brown (1967).



Bibliography



• K.G.Cox, J.D.Bell & R.J Pankhurst (1979): The interpretetion of igneous rocks. George Allen&Unwin editori.
• David Shelley (1983): Igneous and metamorphic rocks under the microscope. Campman & Hall editori
• J.P Bard (1980): Microtextures des roches magmatiques et metamorphiques. MASSON editore

Photo
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Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 2x (Field of view = 7mm)
cumulitesardegna(3).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 2x (Field of view = 7mm)
cumulitesardegna(4).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 2x (Field of view = 7mm)
cumulitesardegna(5).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 2x (Field of view = 7mm)
cumulitesardegna(6).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 2x (Field of view = 7mm)
cumulitesardegna(7).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(8).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(9).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(10).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(11).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(12).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(13).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(14).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(15).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
cumulitesardegna(16).jpg

Plagioclase crystals with interstitial Hornblende in a Orthocumulates from Sardinia (Italy). XPL image. 10x (Field of view = 2mm)
ortocumulite2012(2).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(3).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumulite2012(4).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende and pyroxene. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(5).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(6).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(7).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(8).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumulite2012(9).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumulite2012(10).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumulite2012(11).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumulite2012(12).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumulite2012(13).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumilite(43).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Pyroxene. PPL image. 2x (Field of view = 7mm)
ortocumilite(36).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Pyroxene. PPL image. 10x (Field of view = 2mm)
ortocumilite(38).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Pyroxene. PPL image. 10x (Field of view = 2mm)
ortocumilite(57).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Pyroxene. XPL image. 10x (Field of view = 2mm)
ortocumilite(55).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Pyroxene. XPL image. 10x (Field of view = 2mm)
ortocumilite(47).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 10x (Field of view = 2mm)
ortocumilite(48).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumilite(49).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumilite(51).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 10x (Field of view = 2mm)
ortocumilite(40).jpg

Euhedral olivine crystal enclodes in Pyroxene. XPL image. 10x (Field of view = 2mm)
ortocumilite(23).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 10x (Field of view = 2mm)
ortocumilite(42).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumilite(35).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
ortocumilite(26).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. XPL image. 2x (Field of view = 7mm)
ortocumilite(31).jpg

Altered Olivine phenocrysts enclosed in Poikilitic Hornblende. PPL image. 2x (Field of view = 7mm)
augitepecilitica2012(2).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. PPL image. 2x (Field of view = 7mm)
augitepecilitica2012(3).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
augitepecilitica2012(4).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. PPL image. 2x (Field of view = 7mm)
augitepecilitica2012(5).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. ZPL image. 2x (Field of view = 7mm)
augitepecilitica2012(6).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. PPL image. 2x (Field of view = 7mm)
augitepecilitica2012(7).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. PPL image. 2x (Field of view = 7mm)
augitepecilitica2012(8).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
augitepecilitica2012(9).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
augitepecilitica2012(10).jpg

Poikilitic Augite in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(2).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(3).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(4).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(5).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(6).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(7).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 2x (Field of view = 7mm)
cumulitenuovazelanda2012(8).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(9).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(10).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(11).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(12).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(13).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(14).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)
cumulitenuovazelanda2012(15).jpg

Ehuedral olivine crystals with interstitial plagioclase in a Orthocumulite. New Zeland. XPL image. 10x (Field of view = 2mm)