Mineral assemblages

You seem to be missing the point.
It is my belief that nearly all of the continental crust began as "sedimentary" rock. Its nearly all metamorphic rock.

so how does all this classification help us??

It helps a great deal. Earth differentiated on its own into gabbro and peridotite. Earths moon Theia differentiated further into granodiorite and dunite. When Theia's orbit decayed it reached the Roche limit and over 3.5 billion years slowly deposited all of its mass onto a ring of mountains circling the earth's equator. First the granodiorite was deposited. The granodiorite metamorphosed into the various rocks of the continental crust. Then 1 billion years ago the dunite was deposited. The dunite sank to the bottom of the mantle. In the process the supercontinent rodinia was split in half

Rodinia

http://i.imgur.com/AWym4oX.jpg

I think it's interesting how Sweden/Norway and Baffin Island are next to each other (in Rodinia) and are mirror images of each other

https://en.wikipedia.org/wiki/Equatorial_ridge_on_Iapetus

Saturn's moon Iapetus has a long, 20-kilometer-high ridge running along most of its equator. It was discovered by the Cassini probe in 2004. The ridge's origin is unknown. There are bright areas on the sides of the equatorial ridge near Iapetus's bright trailing hemisphere, which were already visible in Voyager images appearing like mountains and were nicknamed the "Voyager Mountains"

pardon me if I aint buyin it.
eg, read Rogers (1996) and analyze whats been said about the NENA supercontintental area, and Rogers and Santosh (2002) on the development and accretion of the various cratons.(each with a somewhat unique % distribution of rocks).
I was wondering why you were plotzing various rocks and ignoring others. (Id look at suture pegmatites before any other rock belts (if your a geologist).

I hope youre not a teacher of earth science.

so you ascribe differentiation of, say,Ti and heavies in Archean to MORB tholeites to density diffusion?.
You realize that most differentiation of magmas and lavas (at least from the depths sampled) occur horizontally?? Many of us make very good livings at keeping track of norms of minerals from both collision and trailing edge deposits of various ages??.
Once we found the secrets that tectonics gave us and forgot about "geosynclinal bs", prospecting became more of a science than an adventure.

Yes plate tectonics explains the motion of the continents very very well. But where did the continental crust itself come from?

The so-called experts can't even agree on how Rodinia was assembled and you expect me to buy all this garbage about supposed supercontinents that existed a billion years before rodinia? No I'm definitely not buying that.

your talking about Columbia?? Structural geology mapping of orogens, ice "scratches" AND (my old friend) pegmatites and serpentinites all provide evidence. I can understand that its tough to picture globl tectonics in the Precambrian, but some structurl geologist like Rogers have done a fairly good job interpreting the story. Of course it gets refined as we discover new deposits. Hell, global tectonics as a mature discipline is only a little bit over 60 years old and most of its stories are only possible because of new and more sensitive geophysical tricks and computer models.

Yes there's tons of Clues hidden out there. But that doesn't mean their theory is anywhere close to correct. I know for a fact that they don't even have rodinia assembled correctly. I seriously doubt they know what happened 1-2 billion years before rodinia.

https://i.imgur.com/AWym4oX.jpg

submit a paper to a journal if you feel that no one is listening.
Have you actuqlly been to any of the field sites ?

Pardon my igneous intrusion but this a super continental topic.