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>> No.30578164 [View]
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30578164

/ehe~/, /mhm/, and /V7/ are all located at the foreland basin of a collisional orogeny between Minor Holo plate and /nasfaqg/ plate, with the latter subducting under the former, although the nature of collisional orogeny (mountain-building stemming from collision of two continental plates) mean (modern) volcanism will be uncommon. This kind of orogeny is characterised by high-P/low-T metamorphism, including blueschist and eclogite. Igneous rocks will be primarily intrusive and weather-resistant in nature, like granite and diorite. Common minerals associated with this kind of orogeny include iron, copper, lead, and zinc.

This applies primarily to part of /mhm/, with the majority of land in the three countries comprising retro foreland basin caused by the aforementioned orogeny. Here, primarily sedimentary rocks often undergo metamorphism, forming rocks such as quartzite, marble, and bituminous coal. This folding can also form traps that result in hydrocarbon reserves. In terms of metallic ores, a significant amount of them stems from ancient hydrothermal vents ultimately originating from the mid-oceanic ridge towards /inf/. Copper and gold are the most notable minerals, although trace amounts of metals like silver and molybdenum might also be found. The latter might not be economically viable on their own, but can nonetheless be exploited as byproducts of other mining operations. Due to the heavy rainfall of the region, erosion of rocks and flow of underground water can also carry minerals mentioned in the previous paragraph to deposit in the foreland basins.

Like many tropical soils, the majority of soil in these countries will be oxisol, including laterite. Heavy leeching from the tropical rain results in infertile topsoil, but it can be improved through the use of agricultural lime and fertiliser, such as the creation of terra preta through slash-and-char agriculture in Amazonia.

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