5 ms·

Right I guess I was assuming metallic off the bat. But is that even true? Basically every non-ferrous metallic ore deposit is the site of an ancient volcano?

eurasiantiger 5y ago
The entire planet could be described as an ancient volcano, so this discussion is a bit misleading.
- dodobirdlord 5y ago
  It's wrong, since "non-ferrous natural resources" includes a lot of things lighter than iron, notably aluminum, but it's not really misleading, it's got the right general idea. Before the Earth formed a solid crust, heavier elements settled out of the outermost layer of liquid and fell inward toward the core. Only where convection plumes have brought magma to the surface from deeper in the mantle do we find high concentrations of heavier elements in the Earth's crust.
kortex 5y ago
Even with a super generous interpretation of "most non-ferrous metallic ore natural resources" - there's Lithium and other alkali metal salts, mined of dried lake beds. I think Group 2 is similar. Also aluminum from bauxite, which is sedimentary. Too lazy to keep googling counter-examples. That line needs a lot of qualifiers to be correct. Unless they are using "non-ferrous" in some super bizarre way.
- lumost 5y ago
  Gold deposits have also been known to originate from reasonably modern (read last 2 billion years) impacts.
- frazbin 5y ago
  How about "heavy elements,especially transition metals"
monknomo 5y ago
Igneous rocks, generally, are the site of ancient volcanos, or at least active undersea cracks. Igneous rocks tend to have the interesting minerals in them. Take the gold deposits of southeast alaska. When they were formed, geologists think, they were probably black smokers near undersea cracks that belched out plumes of gold bearing minerals. Several million years of continental drift and they are strata under mountains

eurasiantiger 5y ago

The entire planet could be described as an ancient volcano, so this discussion is a bit misleading.

dodobirdlord 5y ago
It's wrong, since "non-ferrous natural resources" includes a lot of things lighter than iron, notably aluminum, but it's not really misleading, it's got the right general idea. Before the Earth formed a solid crust, heavier elements settled out of the outermost layer of liquid and fell inward toward the core. Only where convection plumes have brought magma to the surface from deeper in the mantle do we find high concentrations of heavier elements in the Earth's crust.

kortex 5y ago

Even with a super generous interpretation of "most non-ferrous metallic ore natural resources" - there's Lithium and other alkali metal salts, mined of dried lake beds. I think Group 2 is similar. Also aluminum from bauxite, which is sedimentary. Too lazy to keep googling counter-examples. That line needs a lot of qualifiers to be correct. Unless they are using "non-ferrous" in some super bizarre way.

lumost 5y ago
Gold deposits have also been known to originate from reasonably modern (read last 2 billion years) impacts.
frazbin 5y ago
How about "heavy elements,especially transition metals"

monknomo 5y ago

Igneous rocks, generally, are the site of ancient volcanos, or at least active undersea cracks. Igneous rocks tend to have the interesting minerals in them. Take the gold deposits of southeast alaska. When they were formed, geologists think, they were probably black smokers near undersea cracks that belched out plumes of gold bearing minerals. Several million years of continental drift and they are strata under mountains