Spanish River Carbonatite is a rare magmatic, alkalic deposit characterized by:

The most naturally fertile regions on Earth exist where the above characteristics (mineralogical-biological interactions) are found in association with extremely reactive alkalic rocks. The essential primary minerals contained in these rocks are the first to be utilized in biological systems. These extremely fragile minerals do not survive geological transformations (physical, chemical or biological) and break down easily to supply the ecosystem with nutrients.

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Carbonatites are relatively rare.

They are igneous in origin and thus primary in nature. Carbonatites are only found at the weakened margins of colliding or separating continental plates. The magma originates from extreme depth. The Spanish River Carbonatite is located in the Precambrian Shield along an ancient rift valley. Many geologists believe the major faulting, which allowed access to deep-seated magma formed the Spanish River Carbonatite Complex and the Sudbury nickel basin were the result of a meteor impact.

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