Brief introduction of formation conditions of marble deposit in Dali
According to mineralization, marble deposits in China can be divided into sedimentary origin and metamorphic origin, among which metamorphic origin can be divided into regional metamorphism and contact metamorphism. According to the ore-forming parent rocks, it can be divided into carbonate rocks and magnesia-carbon silicalite rocks. On this basis, according to the ore lithology, the marble deposits in China are divided into six types, among which limestone marble deposits include? No fossils or special structures? And then what? Contains fossils or special structures? Two kinds. Other types are dolomite marble deposit, marble deposit, dolomite marble deposit, serpentine marble deposit and forsterite skarn marble deposit.
Of the total marble reserves in China, sedimentary type accounts for about 30%, regional metamorphic type accounts for more than 50%, and contact metamorphic type accounts for more than 10%.
Sedimentary marble deposits include carbonate rocks of various sedimentary origins, such as limestone, dolomite and dolomitic limestone. Any marble with beautiful color or pattern, fine texture, good blockiness and high gloss after polishing can be used as decorative marble. Sedimentary marble deposits are generally stable in horizon and large in scale, and their occurrence ages are mainly Sinian, Carboniferous, Permian and Triassic.
A typical deposit, such as Baiyundong marble deposit in Yixing, Jiangsu Province, has Triassic Qinglong limestone in the ore system, which is thick and layered, with a controlled length of about 500m and a thickness of 10 to 100 meters, and the marble color is light red. Milky white, trade name? Cream? Marble. In sedimentary marble deposits, the stone materials of biological limestone and special structural limestone series marble deposits often have beautiful and special patterns, which can be made not only into decorative plates, but also into various handicrafts. Like Anhui? Red snail? 、? Grey snail? Dali rock formation is composed of stromatolite algal reef limestone in Qingbaikou period. Hubei? Teng Yulong? It is a reef composed of Permian sponges, corals, bryozoa, foraminifera and coral fossils. Sichuan? White crane taro? This is a Permian biogenic limestone. Reef limestone or bioclastic limestone belongs to Sinian system, which is mostly distributed in Paleozoic and Mesozoic marine carbonate rock series. Because they need a special forming environment, they are scattered and precious.
The most typical structural limestone marble deposit with special structure is Zidouban marble deposit, which is composed of Ordovician bamboo-leaf limestone and distributed in North China platform. Bamboo-leaf limestone is a kind of limestone cemented by calcium, which is first precipitated, broken into oblate mud gravel by wind and waves and then deposited. The probability of this kind of deposit is very small, and the scale of deposit is not very large.
The regional metamorphic marble deposit occurs in marble or dolomite marble, with large scale, huge layered and quasi-layered ore bodies, mainly homogeneous fine-grained metamorphic structures, and relatively uniform color, pattern and structure. The color of marble is determined by its impurities. Generally, pure pure white microcrystals are the most precious, called white marble; Pure white, visible particles are called big snowflakes and small snowflakes respectively according to the particle size; Pure black people contain more organic matter, while pure black people are less; Gray, brown and purple marble deposits are also common. This kind of marble deposit is formed by recrystallization after slight metamorphism of the original rock, so it is mostly distributed in the regional metamorphic belt of shallow metamorphism, mostly near the low mountains on the edge of several mountains in China, and widely distributed. The age of coal seams is consistent with that of marine thick carbonate rocks in China, mainly including Sinian, Cambrian and some Silurian, Devonian and Carboniferous in the south. Such as Huangshan Hou marble mining area in Laizhou, Shandong Province and Shiwo marble mining area in Fangshan, Beijing.
The contact metamorphic marble deposit is a carbonate layer. Influenced by the heat or hydrothermal solution of magma intrusion contact zone, the surrounding rocks are altered, forming skarn or various altered rock deposits. The characteristics of this kind of deposit are: marble is distributed near the contact zone, the ore body is controlled by the contact zone, which is generally irregular, the rock-forming minerals are coarse in particle size, the mineral composition is complex, the quality changes greatly, and the deposit scale is not very large.
There are usually three types of such deposits. One is composed of skarn marble, which occurs in the contact zone between carbonate rock and granite rock mass. Most of its stones are white with colored patterns at the bottom, but generally, the ore body is small, the ore quantity is small, and the scrap is not large. Yanshanian granites are widely distributed in China, especially in the central and eastern regions. These deposits were formed when the rock mass came into contact with limestone and dolomite of various ages. The other is composed of serpentine marble, and the third is composed of forsterite skarn. The former stone is mainly yellow-green, while the latter is mainly green, and there are many color changes based on the main color of yellow-green. These two types of deposits are distributed in the regional metamorphic belt with folded mountains, and the ore beds are older, mostly Paleozoic and Precambrian.
Knowledge expansion of the formation conditions of marble deposits in Dali: Dali cuisine
Dali's diet is very distinctive. Backed by Cangshan Mountain, with the advantages of Cangshan Mountain, dried mushrooms, head vegetables and Tricholoma matsutake are rich, fresh and unique in taste. On the verge of Erhai Lake, with the help of Erhai Lake, aquatic products are quite rich, such as bow fish and snail. Dali's snacks are also very distinctive. The famous shredded milk powder, wonderful bait blocks, crispy Baba and tender chicken rice noodles are all memorable.
Renmin Road? Meizijing restaurant? It is an old-fashioned food in Dali. Not only the dishes are authentic and delicious, but also the special plum wine is mouth watering. Hailali restaurant in foreigner street has a wide variety of dishes and tastes good.
Tubawan
Eight bowls of dirt? It is a set of typical recipes for Bai traditional banquets, including cooking, frying, steaming, frying, frying, pickling and other dishes. It is bright in color, nourishing and invigorating the stomach, and is suitable for all ages. The large bowl consists of eight hot dishes: stewed red glutinous rice with red meat; Crispy meat fried with egg paste; Add soy sauce and honey to steam thousands of pork with five flowers and three lines; Steamed pork with sweet potato or potato; Dry incense of pig head, pig liver and pork; White lentils wrapped in minced meat and egg crumbs; Chopsticks made of fungus, tofu, water, shredded eggs and vegetable stalks; Fried pork strips with bamboo shoots.
Dalibaizu casserole fish
Erhai Lake in Dali is the largest freshwater lake in Hengduan Mountains of Yunnan. Erhai Lake is rich in natural resources, with more than ten kinds of fish alone. The methods and cooking techniques of Bai people eating fish are very unique. Among many ways to eat, the most distinctive one is casserole fish. Casserole fish condenses the essence of Bai fish flavor. It is hot and eaten with tofu and other foods. Delicious, it is a delicacy for Dali Bai people to entertain guests. The cooking method of casserole fish is as follows: scrape the yellow-shelled carp caught from Erhai Lake, wipe off the water with a towel, and rub salt on the abdominal wall. After marinating for more than 10 minutes, stew in a special casserole in Dali, then add more than ten kinds of ingredients and condiments such as tofu, ham, meatballs, magnolia slices and pork tendon, and cook the casserole on a charcoal stove.
Milk fan
Milk fan is a fan-shaped dairy product, which is the first-class dish of Bai people in Eryuan. What is the 18 strange thing of Yunnan milk fans? Milk is sold as a fan? , refers to? Chest fan? . There are many ways to eat milk fans, which can be eaten raw or cooked, or burned, fried, fried and boiled. White three fans brewed with milk tea, roasted tea and walnut noodles.
Dali mugua chicken
Papaya is sour and delicious. It can be eaten raw with sugar, salt and sauce from the beginning of spring flowers to the ripening of melon in Mid-Autumn Festival. The largest amount is made into candied fruit or salted papaya, which is very popular with the public. Therefore, the Bai people in Yunlong County, Dali Prefecture use the local rich sour taste and delicious white papaya roast chicken to prevent and treat diseases, and also use it to entertain tourists from afar, so as to relieve fatigue, strengthen tendons and eliminate dampness, strengthen stomach and soothe liver, and become a famous medicinal diet for the Bai people. Chickens used for Mugua chickens must be based on 1.500g chickens. After slaughter, cut the hair into small pieces, stir-fry in a hot pot of sesame oil, add salt and cook until it is 70% cooked, add peeled and shredded papaya and continue to cook until the chicken is tender, and then remove pepper and tsaoko powder. Mugua chicken, soup and meat are all sour and fragrant, with pure taste and no greasy feeling.
rawhide
Roast pork (mostly the skin of buttocks and hind legs) and pork liver are cut into filaments, and served with onions, garlic, coriander, stewed plums, Chili noodles and soy sauce. This way of eating is called by the people? Eat raw skin? . According to legend, the custom of eating raw skins began in Nanzhao period.
Ham Baba
Lijiang Baba Heqing wine, Jianchuan carpenters can be seen everywhere. ? This is a famous proverb circulating in western Yunnan. Lijiang Baba has long been famous in Kunming and other places. Its ham Baba is the highest-level boutique in Lijiang Baba. Ham Baba, with golden color and distinct layers, is crisp outside and tender inside, crispy and delicious, salty and sweet, and very refreshing.
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