Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Extremely Iron-Rich Olivines from Ferrosyenites of the Prakasam District, Andhra Pradesh with Petrogenetic Comments


Affiliations
1 Department of Geology, Osmania University, Hyderabad - 500 007, India
 

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Though fayalite + quartz association is common in a variety of rocks, it is extremely rare with orthopyroxene and virtually non~existent with orthopyroxene + garnet. Hence the fayalite-ferrosilite-ferrohedenbergite( almandine-rich)garnet-quartz-bearing ferrosyenites in the Prakasam district (A.P.) are deemed as singularly exceptional and amazingly unique (Leelanandam, 1993a). The main purpose of this communication is to present electron microprobe analyses of the extremely iron-rich olivines (Fa97.29 - Fa99.78) from these unusual rocks and to comment on the relevant petrogenetic implications.
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  • Extremely Iron-Rich Olivines from Ferrosyenites of the Prakasam District, Andhra Pradesh with Petrogenetic Comments

Abstract Views: 184  |  PDF Views: 139

Authors

C. Leelanandam
Department of Geology, Osmania University, Hyderabad - 500 007, India

Abstract


Though fayalite + quartz association is common in a variety of rocks, it is extremely rare with orthopyroxene and virtually non~existent with orthopyroxene + garnet. Hence the fayalite-ferrosilite-ferrohedenbergite( almandine-rich)garnet-quartz-bearing ferrosyenites in the Prakasam district (A.P.) are deemed as singularly exceptional and amazingly unique (Leelanandam, 1993a). The main purpose of this communication is to present electron microprobe analyses of the extremely iron-rich olivines (Fa97.29 - Fa99.78) from these unusual rocks and to comment on the relevant petrogenetic implications.