Mafic Amphibolite Bulk Composition

why not start with some canadian shield stuff like muskoka bay as compared to mid ocean ridge basalts.


Anyway, metabasites are a collective term so youre probably as good ith a bunch of Mafics.

PS, experience weve had with Thermocalc is that it can get easily confused with many possible reactions involved in your samples, so,

Hi Farmerman, thank you for the reply. I will have a look at some of the Canadian Shield stuff. Indeed, metabasites are a collective term and I believe the outcome of what I am trying to do is gather a range of mafic-to-intermediate bulk rocks which can represent the lower continental crust as a whole. My advisor has asked me to find something like a bulk composition "X" which represents an average, or represents all of the mafic amphibolites in all orogenic belt settings, so my project can apply to all these localites in general, rather than just one specific composition. But I guess that is not a likely outcome. We initially used an average Morb and Diorite, but it seems unlikely you'd find a Morb in a continental orogenic setting.

Once again thank you for the reply, much appreciated! Have a good one!

This looks kind of like the English language...but ...? I know it's not supposed to be understood by mortals.

Yea Rag, esp not old ones. Sure would have liked a photo, wunt u

Iv always been of interest because of the economic implications, but how bout some continental marginal tholeites.?

Morning folks, sorry about all the crappy jargon!

Marginal tholeites may work, I will give this a run and see what I come up with. Additionally I found an experimental article by Frank Spear (1981 I believe) which uses an Olivine Tholeiite as a starting composition, representing a large volume of 'typical' amphibolites, this may also work for my purposes. Another avenue for me to go down might be to look at some rift/continental flood basalts, perhaps.

Or another thought...I might take a starting mafic granulite composition and modify the chemistry to add some melt back into it. But that is a last resort.