Origin of the largest molybdenum deposit in Asia
Luanchuan molybdenum reserves of 2 million 200 thousand tons, ranking first in Asia, the world's third. Then, where does the molybdenum in Luanchuan come from? How did it come into being? This has been a fresh, mysterious, scientific expedition. With a curious heart, the author through the consult to experts, access to relevant information, gradually raised it a layer of mystery.
According to an authoritative magazine, the tectonic fracture and granite intrusion in the eastern part of China were extensively developed in the Mesozoic Yanshan period, which lasted for 195 million years and ~6700 years ago. The eastern Qinling Mountains area lies between the North China plate and the Yang Zi plate. The crust and mantle in the eastern segment of the Qinling Mountains orogenic belt are rich in copper, lead, zinc, gold, silver, tungsten and molybdenum. After many times, deep plate tectonics, magmatic eruptions and strong activities in the area of copper, lead, zinc, gold, silver, tungsten, molybdenum coordinates, finally superposition enrichment, so that the molybdenum deposits in the East Qinling Mountains regional distribution, and the metallogenic space and time appear. To become an underground treasure on the motherland.
"According to geological classification, Luanchuan molybdenum deposits are mostly skarn type deposits, and a small number of porphyry hosted molybdenum deposits are disseminated in," Zheng Yi said in an article entitled "molybdenum metal.". From the point of view of ore genesis, these two deposits are formed with ore, gas and water solution, so they belong to the type of gasification hydrothermal deposits. The so-called epithermal ore deposits can, according to geologists, be caused by the energy of the earth's interior, including heat, kinetic energy, and chemical energy, and produce a gas and water solution dissolved in minerals. These solutions are formed by magmatic water, metamorphic water, and meteoric water. Magmatic water refers to the earth's interior magma into the shallow crust, the dissolved water pressure decreases the release; metamorphic water refers to the hot water solution is extruded from sedimentary rocks in metamorphic rocks in; in addition, when the atmospheric precipitation and sea water will seep into the deep underground. After acquiring geothermal or magmatic heat, it becomes a very high temperature hydrothermal fluid. Because the magma contains sulfur and other ore forming metals such as copper, lead, zinc, molybdenum, silver and so on, they are part of magmatic crystallization during the crystallization of magmatic water, forming hydrothermal fluid containing minerals. In addition, hydrothermal fluids also extract minerals from the rocks they pass through. In the rock flowing through, the ore forming elements such as lead, zinc, molybdenum, silver and so on have a trace of common minerals. Hydrothermal fluid flows through the burning rocks, and rock interaction in time or recrystallization of these minerals dissolved, with ore-forming elements in hydrothermal fluid.