Gold formation and accumulation of gold

1. The world's gold treasures are mainly buried in the form of rock gold and sand gold, in addition to associated gold. Celestial body operation, earth formation, volcanic eruption, ancient mountain movement, magma gushing, gold elements are ejected from the core of the earth and formed into rock gold; the mountains and mountains rich in gold, weathering, thunder and lightning, storms, Sandy gold is formed by landslides, mudslides, flooding, and sedimentation in stable waters of rivers.

2. According to scientific measurements and inferences, about 2.6 billion years ago, in the Archean period, volcanic eruptions brought a large amount of gold elements from the core to the mantle and the crust along the fissures, followed by ocean deposition and Regional metamorphism, the formation of the original gold source. About 100 million years ago, in the Mesozoic, due to the powerful force, the crust was deformed and pleated, and the pleats were exposed to the sea surface. The gold material activated and migrated to form a gold ore field, which is what we call rock gold.

3. In the rock-rich enrichment zone, the rock often leaves a lot of natural gold after oxidation. In the shallow layer of rock gold, after tens of millions of years of weathering and erosion, the rock becomes sand. Because of the stable nature of gold, it is dissociated into a monomer. In the process of river water transportation, because of its large proportion, it is deposited in the stable water of the river, thus forming a sand gold mine. At the same time, due to the affinity of Shajin, in the process of river water transportation, it is small and large, forming granular gold of different sizes. To date, the largest gold nugget discovered by humans weighs 280 kilograms, which is produced in California, USA.

4. The gold deposits formed during the change of nature can be roughly divided into three categories: rock gold deposits, sand gold deposits and associated deposits. In the world, the ratio of reserves of rock gold, associated gold and sand gold is about 70:15:15. Among them, the rock gold deposit can be divided into several genetic types: magmatic hydrothermal type, metamorphic hydrothermal type, volcanic hydrothermal type, sedimentary metamorphism type, hot water leaching type and metamorphic conglomerate type.

5. The proportion of various types of gold deposits in the world's total reserves is: 56.2% of metamorphic conglomerate type, 12.4% of metamorphic hydrothermal type, 9.5% of associated gold, 8.9% of sand gold, and hydrothermal type of magma. The volcanic hydrothermal type is 7.0%, and the hot water leaching type is 0.9%.

6. Globally, according to the geotectonic units produced by gold mines, they can be divided into four categories: ground shield metallogenic area, platform and marginal metallogenic area, geosyncline fold belt metallogenic area and Pacific Rim metallogenic belt. . Among them, the gold reserves produced by the shields accounted for 25.6--27.8% of the world's total reserves; the local Mesozoic activation zones of the ancient platform cover, accounting for 1.1-1.3%, and the excellent ground area, accounting for 12.9-15.6%; The trough area accounts for 1.1-1.2%; while the ancient platform cover structure area accounts for 47.1-47.7%.

This is the case with the formation of gold and the accumulation of gold.