Geological Characteristics, Genetic Types and Utilization Value of Yonghong Fluorite Deposit in Mabian Area, Southwest Sichuan and Its Enlightenment to Regional Prospecting
Sichuan is an area where there are no fluorite deposits and no fluorite metallogenic belts. The discovery of medium-sized fluorite deposit in Mabian area is of great significance. Through field geological investigation and collection and analysis of geological data, the genesis of Yonghong Fluorite deposit in Mabian area and its enlightenment to regional prospecting are discussed. The results showed that the ore body occurs in the siltstone of Qiongzhusi Formation of Cambrian Terreneuvian, which is strictly controlled by fault. The metallogenic factors are dolomite, limestone, fluorine-containing phosphorites and fault, and there are no volcanic rock and intrusive rock. The five subtypes of hydrothermal filling type fluorite deposits summarized by predecessors have volcanic rock or intrusive rock. Therefore, it is summarized as a new subtype of hydrothermal filling fluorite type deposit-Yonghong subtype of hydrothermal filling type fluorite deposit (fault+carbonate rock+fluorophosphate); Yonghong fluorite deposit in Mabian area is a medium-sized fluorite deposit with an identified resource of 450000 t and its average content of CaF2 was 34.61%; Through the comparative analysis of metallogenic factors, Mabian-Leibo-Jinyang areas on Ebian-Jinyang fault zone have good fluorite prospecting prospects. The above results are of great significance to fill the gap of fluorite without metallogenic belt in Sichuan, guide the regional prospecting of Ebian-Jinyang fault zone and promote the economic development of Wumeng Mountains region.
Geological Features of Kvanefield REE Deposit in Southwestern Greenland
Kvanefield REE deposit is a world-class REE deposit, which is located at the northern margin of the Ilímaussaq complex in the central part of Gardar igneous province, southwestern Greenland. The intrusion controlling ore is the mesoproterozoic Ilimaussaq complex, where two main varieties of metallogenic parent rocks are distinguished, green aegirine lujavrite and black arfvedsonite lujavrite, which all are agpaitic alkaline rocks, defined as a peralkaline nepheline syenit. The ore bodies are controlled by fractures or interlayer-gliding surfaces, which consist of sodalite lujavrite pegmatite veins and layered arfvedsonite lujavrite. According to mineral assemblage and occurrence form, the ores are divided into arfvedsonite-albite- steenstrupine type and sodalite-aegirine-eudialite type. Specifically, steenstrupine and eudialite are the main bearing rare earth element minerals in the two ores. The steenstrupine have varying ω(REO) contents ranging from 31.5% to 44.9%, with an average of 35.9%, and stone LREE, U and Th enrichment, moreover, which are easily replaced by monazite and uranothorite. In addition, eudialyte have stable ω(REO) contents ranging 1.41% to 1.90%, riching HREE, Nb, and Ta. Two mode of rare earth element occurrence are distinguished in eudialyte, isomorphism and other finely mineral inclusions such as monazite and steenstrupine. With alkaline complex multi-stage diagenesis process of rock mass and alkaline magma in aegirine lujavrite stage of magmatic hydrothermal mineralization and arfvedsonite lujavrite stage magma and mineralization, and form tratiform-lenticular structure on the whole, diagenetic-mineralization model has a different source, multi-stage, with an invasion characteristics.
Discussion on Metallogenic Geological Characteristics and Genesis of Shuanghe Barite-Fluorite Deposit in Wuchuan, Guizhou Province
Fluorite is mainly used in the steel and chemical industries. The market demand for fluorite has been growing, and fluorite has become a strategic mineral in China. With the exhaustion of fluorite resources in the main producing areas (Zhejiang, Hunan, etc.), the barite fluorite deposit has been paid more attention and utilized in Wuling Mountain area (the adjacent place of Chongqing, Guizhou and Hunan). Through field geological work, the geological characteristics of shuanghe Barite-fluorite deposit in Wuchuan were studied, it is considered that the Shuanghe Barite-fluorite deposit in Wuchuan is controlled by the lower Ordovician Honghuayuan formation and the NW trending development of tensile fractures, the ore-bearing horizon is the Lower Ordovician Honghuayuan group, It is proposed that the ore-prospecting direction of the barite-fluorite ore body is controlled by the Lower Ordovician Honghuayuan Formation and the NW direction structure, It is helpful for further prospecting work in Wuling Mountain area of Guizhou province, it will actively support the development of mining industry in the region and provide services for poverty alleviation.
Metallogenic Regularity and Prospecting Potential of Dachang gold Ore Concentration Area in Qinghai Province
Dachang gold ore concentration area is located in Maduo township, Qumalai County, Qinghai Province. It is located in the middle of the gold and antimony metallogenic belt in the north Mount Bayankala , whichis known as the "gold belt" in Qinghai Province. The estimated gold resource amount has exceeded 190 t.Based on the systematic collection and analysis of the previous research results, the metallogenic rules of the gold ore concentration area are analyzed and summarized to evaluate the regional ore-prospecting potential.Research shows that gold deposits mainly occur in the Triassic strata and is controlled by Gande-Maduo deep fault belt, Dachang, Zhajiatongna, Jiageilongwa, Shaorio and Zhalayi gold deposits are distributed on both sides of the fault in a beadlike manner, and the type of deposit is "middle-low temperature hydrothermal tectonic-altered rock type" gold deposit, the metallogenic epoch of the late Indosinian. The ore-forming materials are mainly derived from the initial ore-bearing hydrothermal fluid, and some of them are extracted from the surrounding rock strata. There are good metallogenic potential in the overburden area and the deep part of the gold deposits, including Apengeyiand Geyonggamakao gold point, which are important prospecting areas in this area.
1980, bimonthly
ISSN: 1000-6532
CN: 51-1251/TD
Editor-in-chief：Yan Shiqiang
Sponsor：Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences
Sponsored by：Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences
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2023, 44(4): 1-11.
doi: 10.3969/j.issn.1000-6532.2023.04.001
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