Before the development of Changle Volcano Group, most of the mountains were covered with sand and stones, and the volcanic characteristics were not obvious, so the locals did not know that these undulating mountains were volcanic groups. Until 1985, a villager in Changle stumbled upon a sapphire, so from 1987, farmers near the mining area began to mine sapphire at the northern foot of Fangshan Mountain in Changle. They spontaneously organized themselves, ranging from two or three people to more than a dozen people, using drilling and blasting to dig holes in the mountains.

Since Changle discovered the first sapphire, this ordinary land has instantly become a new territory for treasure hunters. Getting rich overnight is no longer a myth, because every soil and rock here may contain a sapphire worth hundreds of thousands or even millions of yuan. In a few years, most people in the mining area became rich. After the field investigation by Shandong Geological Research Institute, it was found that there were 84 volcanic remains in Changle County, of which 23 were well protected and undeveloped, and the remaining 6 1 were mined and excavated to varying degrees. Most of the reasons for these volcanic mining are because there are precious sapphires in them.

If 230 million carats of sapphire were converted into money, it would be an unimaginable number. However, due to the rational use of resources, all forms of sapphire mining in Changle County are now banned, so most of these sapphires are still sleeping in the basalt of volcanic mountains.

Changle Volcano Group was formed 654.38+08 million years ago. It devoured many lives when it broke out, but the flame created magic. In Changle area, sapphire miners know that sapphire minerals will only be found near volcanoes. Volcanoes are all formed by the accumulation of ejected magma. Is this molten liquid magma rich in sapphire? What's the relationship between volcano and sapphire?

The Tancheng-Lujiang fault zone is a major fault zone in the northeast giant fault system of East Asia continent. It stretches for more than 2,400 kilometers in China and passes through Changle County. It is an active zone of deep magma on the earth. At present, the horizontal sliding rate of the Tan-Lu fault zone is about 2.2 mm per year.

The interior of the earth is the core, mantle and crust from the inside out. The core and crust are solid substances, while the mantle is mostly fluid. In this "liquid zone" between 100 ~ 150 km below the crust, there are molten silicate substances under high temperature and pressure, which is magma. When it rushed out of the surface from the weak part of the earth's crust, a volcanic eruption occurred immediately.

Sapphire came to the surface from the mantle layer with volcanic eruption. After millions or even tens of millions of years of weathering and erosion, some were almost exposed on the surface and some were hidden in basalt. But relative to the depth of the mantle layer, it is almost no distance from human beings. There are many volcanoes on the earth, but few sapphires. Why don't volcanoes in other places have sapphires, while volcanoes in Changle County have sapphires? We'll show you the next program.