I got bulk geochemistry result of kamanery syenite rock. In which, concentration of silica is very high range from 71% to 75 and concentration of K2O range from 2 to 4%. From which, bivariate diagram (Na2O+K2O vs. SiO2) shows most of the samples falls in sub-alkaline field but earlier studies confirms that the kamanery syenite was alkaline. From my result, I so confused.
Qusn : is there any possibility to increase sio2 content and decrease Na2O and K2O content?
if possible how to classify the rock type?
DEAR PERUMAL
how many samples you test, and it gave you a same result or close, you have to be aware the previous studies it is satisfied. second thing you have to check the samples in petrographic thin section and examine thequartz, orthoclase and plagioclase content relation. make also plots for trace element verses SIO2 . then maybe u can figure out the result.
i hope i got your point
Hi Gangatharan Perumal:
If SiO2 content is higher than 63%, the rock may not be termed syenite in your case. It is likely a granitic rock in composition. Thus, the rock with subalkaline feature is not surprising. Mineral assemblage should be examined first before using whole-rock geochemical criteria.
Regards,
Xue-Ming Yang
I strongly agree with Mr. Yang. You need petrographic study because you can have weak alteration (adularization) which is not clear by naked eye.
Regards,
Irina Marinova
If it's from the Kamanery suite and not from the host gneissic complex, it's a granite, which would not be a complete surprise, even if the association with the alkaline-peralkaline mafic Pakkanadu Complex holds true. Some more detailed mineralogy/petrology would certainly help.
- Badges
- Science topic
- Similar topics
- Statistics
- Survey