| Reference Type | Journal (article/letter/editorial) |
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| Title | Petrology and Geochemistry of the Oddanchatram Anorthosite and Associated Basic Granulites, Tamil Nadu, South India |
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| Journal | Journal of the Geological Society of India |
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| Authors | Janardhan, A. S. | Author |
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| Wiebe, Robert A. | Author |
| Year | 1985 (March) | Volume | 26 |
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| Page(s) | 163-176 | Issue | 3 |
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| Publisher | Geological Society of India | Place | Bangaluru, India |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17741520 | Long-form Identifier | mindat:1:5:17741520:5 |
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| GUID | 0 |
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| Full Reference | Janardhan, A. S., Wiebe, Robert A. (1985) Petrology and Geochemistry of the Oddanchatram Anorthosite and Associated Basic Granulites, Tamil Nadu, South India. Journal of the Geological Society of India, 26 (3). 163-176 |
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| Plain Text | Janardhan, A. S., Wiebe, Robert A. (1985) Petrology and Geochemistry of the Oddanchatram Anorthosite and Associated Basic Granulites, Tamil Nadu, South India. Journal of the Geological Society of India, 26 (3). 163-176 |
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| In | (1985, March) Journal of the Geological Society of India Vol. 26 (3). Geological Society of India |
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| Abstract/Notes | Preliminary studies of the Oddanchatram anorthosite body, the largest of the bodies lying along a 100 km linear; on the northern slopes of Patni hilI ranges, show that it has all the chemical and mineralogical characters of Proterozoic massif anorthosites. Plagioclase compositions reveal two types: a) primary plagioclase of An60 and b) secondary plagioclase with An94 occurring as breakdown product of garnet. Estimates based on primary pyroxenes indicate intrusive temperatures between 960°C-1000°C; pressures of 5.3 kb. based on garnet breakdown products suggest a steep geothermal gradient. The chemistry suggests that the parental magma was unusually feldspathic; primary hornblende indicates a higher H2O content of the magma. |
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