According to the genesis calcite deposits, there are three main types: contact metamorphism, regional metamorphism, and low temperature hydrothermal filling.
The contact metamorphic deposit refers to the calcite deposit formed by the external contact zone of limestone and later intrusive magmatic rocks due to the heat of magmatic activity and the influence of gas and liquid precipitation to produce recrystallization and fading. It is mostly layered and layered, and a few are lenticular. The thermal metamorphism can be called contact thermal metamorphic deposit, and the hydrothermal metasomatism is mainly called contact metasomatism-thermal metamorphic deposit, and the stability of the latter ore body is relatively poor.
Typical deposits: Anhui Qingyang Laishan calcite mine, Zhejiang Jiande Qintang Dali rock mine, Guangdong Lianzhou Daling bamboo tube Chong Dali rock deposit , including Zhejiang Jiande Qintang Dali rock mine, Guangdong Lianzhou Daling bamboo tube Chong marble The mines are actually calcite mines.
Qingshan Laishan calcite mine in Anhui: Calcite content is above 94%, CaO content is 55.01%, MgO content is 0.64%, whiteness is 70.9-92.4%, and quality is stable.
Daliyan Mine in Jiande, Zhejiang Province: The marble in the mining area is formed by thermal metamorphism of limestone. The ore is light gray, light grayish white and white, with a crystal structure. According to the ore structure, it can be divided into giant crystal marble and coarse crystal Dali. Natural types such as rock, mesocrystalline marble, fine-grained marble, and mudstone marble.
The ore is divided into marble according to its mineral composition, dolomitic marble, silicified marble, and siliceous marble. According to the requirements of industrial indicators, the ore grade can be divided into high-quality minerals and industrial mines. Among them, high quality mine w (CaO) ≥ 55%, whiteness ≥ 90%, acid insoluble content ≤ 1%; industrial mine w (CaO) ≥ 52%, whiteness ≥ 82%, acid insoluble content ≤ 2%.
The minerals of marble ore are single, and the main mineral is calcite, which accounts for more than 96%. It is a rhombohedral crystal with a crystal-like aggregate. The gangue minerals are dolomite, quartz, wollastonite and fragmented lava. The chemical composition of the ore is mainly CaCO 3 , and the useful component is CaO, and the content is 54.9% to 55.7%. The factors affecting the quality of ore are mainly whiteness and acid insoluble matter.
A regional metamorphic deposit is a calcite deposit formed by the recrystallization of an early-deposited carbonate rock by regional metamorphism. Layered and layered.
Typical deposit: Sichuan Baoxing Cibayan calcite mine.
Sichuan Baoxing Cabayan Calcite Mine: The ore belt starts from the Huangshui River in Lushan County in the northeast and ends in the Qidong Town of Baoxing County in the southwest. It is generally northeast-southwest, with a total length of about 40km and a width of 0.2~2km. The ore-bearing strata (mineral zone) is the former Sinian salt well group Cabayan Formation. The lithology is sedimentary metamorphic carbonate rock, which is divided into four lithologic sections, all of which have industrial ore bodies.
The rocks are all white fine-grained marble, mainly composed of calcite (97~99%), which contains a small amount of dolomite, and contains a small amount of sericite, quartz and albite minerals. Granular structure, dense block structure.
A low-temperature hydrothermal filling deposit is a calcite deposit that is formed in a carbonate rock formation and is rich in calcium carbonate solution and precipitated and crystallized in a carbonate fracture or dissolution structure. Mostly veined, a few are cystic and irregular.
Typical deposits: Yaowan calcite mine in Qingyang , Anhui, and Caoshan calcite mine in Jiande, Zhejiang.
Yaowan calcite mine in Qingyang, Anhui: Calcite content is above 95%, CaO content is 55.30%, MgO content is 0.43%, whiteness is 91.8%, and the quality is relatively stable. Very small amounts of MgO, argillaceous minerals, iron and opaque minerals. Calcite crystals are generally coarse, containing a small amount of impurities, glass luster, transparent to translucent, generally white, milky white, colorless or light yellow.
At present, China's calcite resources are mainly distributed in Guangxi, Jiangxi, Hunan, Anhui, and Jiangsu. It has also been found in North China and Northeast China, but it is often accompanied by dolomite. The whiteness is generally below 94, and the acid insoluble matter is high. The calcite in the central and eastern parts is mainly composed of medium-high temperature metamorphism. The ore type is mainly marble type medium-fine crystal calcite. The deposits are mostly medium-large deposits. The advantage of this calcite mine is that it is large in scale and has disadvantages such as heavy metals and other harmful components. Too high, its application range in industrial production is thus limited.
On the whole, China's potential calcite resources have huge reserves and broad market prospects. Within the scope permitted by national policies, all regions should rationally set mining rights through resource integration, carry out centralized management and centralized development, so as to achieve large-scale and standardized mining.
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