Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Gold/Mining/Energy : Canadian Diamond Play Cafi -- Ignore unavailable to you. Want to Upgrade?

To: Diamond Daze who wrote (364)	12/9/2002 7:01:09 PM
From: E. Charters	Read Replies (1) \| Respond to of 16206

Would not surprise me if they did miss something because as good as geo might be, ( and they did find the good pyrope in the first place in drift ) they somehow missed the pryrope in the rock. The rock may just be pyrope poor (orangeite, some eclogites, and other K's) leading them to the wrong conclusion. K's are identified by their xenocrysts not phenocrystic make up. In other words the statistically collected minerals they accumulate on the way up, not the original melt. So sparsity can lead to wrong categorization. This is a conundrum as if a rock lacks something you lead to categorize it what is the rock? Well in this case you have to fall back on ground mass and major element chemistry, which believe it or not, will do a distinguishment between lamproites, and lamprophyres. To further complicate the issue it depends on who you consult, because different people are at opposite ends of the spectrum when it comes to mafic rocks of these kinds. Mitchell says that tri-modal mineralogy and emplacement style i.e. pyroclastic and shallow depth of emplacement and low pressure minerals distinguishes lamproites. This I would say is evidentas os their intermediate to felsic erosional resistant nature. Lamprophyres are more micaceous and have more feldspars and tend to dykes etc.. more. But certain people wave their arms and "associate" the mafics and ultra mafics in series and this can lead to jumped conclusions. EC<:-}