from the geological point of view, marble is formed by thermal dynamic metamorphism of limestone. I have compiled the information on the conditions for the formation of marble deposits in Dali for your reference. I hope you will gain something in the reading process!
Introduction to the conditions for the formation of marble deposits 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 magnesium carbonate-siliceous rocks. On this basis, according to the lithology of the ore, the marble deposits in China are classified into six types, among which the limestone marble deposits include? No fossils or special structures? And? Contains fossils or special structures? Two kinds. Other types are dolomite marble deposit, marble marble deposit, dolomite marble deposit, serpentine marble deposit and forsterite skarn marble deposit.
among the total marble reserves in China, sedimentary type accounts for about 31%, regional metamorphic type accounts for more than 51%, and contact metamorphic type accounts for more than 11%.
sedimentary marble deposits include all kinds of carbonate rocks of sedimentary origin, 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 a Triassic Qinglong limestone in the middle and lower strata, with a controlled length of about 511m, a thickness of 11-111 meters and a light red marble color. 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. Such as Anhui? Red snail? 、? Grey snail? The marble seam is composed of stromatolite algal reef limestone in Qingbaikou period. Hubei? Teng Longyu? It is a reef rock composed of Permian sponges, polyps, bryozoa, foraminifera and coral fossils. Sichuan? Baiheyu? It is a Permian biological limestone. The reef limestone or bioclastic limestone is Sinian, and most of them are distributed in the marine carbonate rock series of Paleozoic and Mesozoic. Because they need a special forming environment, they are scattered and precious.
The most typical limestone marble deposit with special structure is Zidouban marble deposit composed of Ordovician bamboo-leaf limestone distributed in North China platform. Bamboo-leaf limestone is a kind of limestone which is composed of calcareous sediments precipitated first, crushed by wind and waves into oblate mud gravel and then deposited, and cemented by calcium. The occurrence probability of such deposits is small, and the scale of deposits is not very large.
The regional metamorphic marble deposit occurs in marble or dolomitic marble, with large scale, huge layered and quasi-layered ore bodies, mainly homogeneous fine-grained metamorphic structure, 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 and visible particles are called big snowflakes and small snowflakes according to the particle size; Pure black people contain more organic matter, but pure color people are less; Gray, brown and purple marble deposits are also common. This kind of marble deposit is formed by recrystallization of original rock after slight metamorphism, so it is mostly distributed in the regional metamorphic belt with shallow metamorphism, mostly near the low mountains on the edge of several mountains in China, and is widely distributed. The age of the seams is consistent with that of the marine thick carbonate rocks in China, mainly 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 rock layer. Influenced by the heat or hydrothermal solution of magma invading the 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, generally irregular, the rock-forming mineral particles are coarse, the mineral composition is complex, the quality changes greatly, and the deposit scale is not very large.
there are three types of such deposits. One is composed of skarn marble, which is produced in the contact zone between carbonate rock and granite rock mass. Most of its stones are white with colored patterns on the base, but generally the ore bodies are small, the ore quantity is small and the block size of waste materials is not large. Yanshanian granites are widely distributed in China, especially in the central and eastern regions, and such deposits can be formed when the rock mass comes into contact with limestone and dolomite of various eras. The other is composed of serpentine marble, and the third is composed of magnesium olivine skarn. The former stone is mainly yellow-green and the latter is mainly green, and all of them have 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 conditions for the formation of marble mineral deposits in Dali: Dali cuisine
Dali diet has its own characteristics. It is backed by Cangshan Mountain, and with the superiority of Cangshan Mountain, Ganba mushroom, tree head vegetable and Tricholoma matsutake are abundant, 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, snail, etc. Dali's snacks are also very distinctive. The famous milk fans, wonderful bait blocks, crispy Baba and tender cold chicken rice noodles are all memorable.
people's road? Meizijing restaurant? It is an old-fashioned food in Dali. Not only are the dishes authentic and delicious, but the specialty plum wine is even more mouth-watering. The Hailari restaurant in foreigner street has a wide variety of dishes and tastes good.
eight bowls of earth and eight bowls of earth? It is a set of typical recipes for traditional banquets of the Bai nationality, including boiled, fried, steamed, fried, fried and pickled dishes, which are bright in color, nourishing and invigorating the stomach and suitable for all ages. Tuba Bowl consists of eight hot dishes: red meat stew with red glutinous rice; Crispy meat fried with egg paste; Add soy sauce and honey to steam thousands of pieces of pork with five flowers and three lines; Steamed pork with sweet potato or potato; Dry incense marinated with pig head, pig liver and pork; White lentils covered with minced meat and egg crumbs; Chop suey made of auricularia auricula, bean curd, water, shredded eggs and vegetable stalks; Bamboo shoots with fried pork strips.
Dali casserole fish
Erhai Lake in Dali is the freshwater lake with the largest storage capacity in the Hengduan water vein in Yunnan. Erhai Lake is rich in natural resources, with more than ten kinds of fish alone. The Bai people's eating methods and cooking techniques for fish are quite unique. Among many ways to eat, the most distinctive one is fish in casserole. Casserole fish concentrates the essence of Bai nationality's fish flavor. It is cooked hot and eaten with tofu and other foods. It is delicious and is a delicacy for Dali Bai nationality to entertain guests. The cooking method of fish in casserole is as follows: after the yellow-shelled carp caught from Erhai Lake is scraped clean, the water is wiped off with a towel, and refined salt is rubbed on the abdominal wall. After marinating for more than 11 minutes, it is stewed in a special casserole in Dali, and then more than ten kinds of ingredients and condiments such as tofu, ham, meatballs, magnolia slices and pork trotters are added, and the casserole is cooked and stewed on a charcoal stove.
Milk fan
Milk fan is a fan-shaped dairy product, and it is an excellent dish for the Bai people in Eryuan. What are the 18 strange things about milk fans in Yunnan? Milk is sold as a fan? , refers to? Breast fan? . There are many ways to eat milk fans, which can be eaten raw or cooked, or burned, fried, fried and boiled. Bai three tea brewed with milk fan, 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 the fruiting of the spring flowers to the ripening of the melons in the Mid-Autumn Festival. The largest amount is made into candied fruit or salted papaya, which is very popular with the public. Therefore, the Bai nationality in Yunlong County, Dali Prefecture, used the local rich sour and delicious white papaya roast chicken to prevent and cure diseases, and also used it to entertain distant visitors, so as to relieve fatigue, strengthen muscles and eliminate dampness, strengthen the stomach and soothe the liver, and became a famous and medicinal diet for the Bai nationality. The chicken used in Mugua chicken must take about 1,511 grams of young chicken as the main material, slaughter the hair, cut it into small pieces, stir-fry it in a hot oil pan, add salt and boil it until it is 71% ripe, add peeled and shredded papaya, continue to cook until the chicken is crisp and tender, and withdraw pepper and tsaoko powder. Mugua chicken, soup and meat are sour and fragrant, with pure taste and no greasy feeling.
raw skin
roast pork (mostly the skin of buttocks and hind legs) and pork liver, cut into filaments, and eat with onion, garlic, coriander, stewed plum, chili pepper noodles and soy sauce as seasoning. 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 is found everywhere by Jianchuan carpenters. ? 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, golden in color, layered, crispy outside and tender inside, fragrant and crisp, salty in sweetness, very refreshing.