The fate of olivine in the lower crust: Pseudomorphs after olivine in coronitic metagabbro from the Grenville Orogen, Ontario
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- 作者：J.L. Kendrick ; R.A. Jamieson
- 关键词：Coronitic metagabbro ; Olivine pseudomorphs ; Orthopyroxene ; + ; Fe&ndash ; Ti oxide symplectite ; Iddingsite ; Coexisting Fe&ndash ; Ti oxides ; Grenville Orogen
- 刊名：Lithos
- 出版年：2016
- 出版时间：1 September 2016
- 年：2016
- 卷：260
- 期：Complete
- 页码：356-370
- 全文大小：3691 K
文摘
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Coronitic metagabbros contain orthopyroxene + oxide symplectite and iddingsite after olivine.
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Symplectites formed by coupled reactions involving oxidation of magmatic olivine and ilmenite
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Increasing fO2 was associated with fluid infiltration at near-peak metamorphic conditions.
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Iddingsite formed by late-stage oxidation/hydration of surviving olivine
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Fluid access during peak and retrograde metamorphism controls survival of olivine.