青海省小圓山鐵多金屬礦區(qū)礦床地質特征及找礦方向
[Abstract]:The Xiaoyuanshan iron polymetallic ore area is located in the Qimantage ophiolite melange belt, an important iron-polymetallic metallogenic belt in Qinghai Province. The exploration of iron polymetallic deposits in this area has delineated many magnetic anomalies closely related to iron and polymetallic mineralization, which shows that the area has strong metallogenic potential. The regional metallogenic geological background and mining area geological characteristics are analyzed, and the geological characteristics and ore-controlling factors of the deposit are discussed. The results show that: (1) the Baishaheyan formation (Pt1b) of the Jinshuikou rock group in Xiaoyuanshan area is rich in ore-forming elements such as WSn-Sn-Cu, etc. Carbonate rocks exist in Ordovician-Silurian Tan-Jianshan Group, which provides favorable surrounding rock conditions for the occurrence of the Xiaoyuan Mountain Iron Polymetallic Deposit. (2) 17 magnetic anomalies were found in the area, which generally distributed in the NWW direction. (3) the iron polymetallic deposits are distributed in the contact zone between intermediate-acid intrusive rocks and surrounding rocks, and the late Variscan Indosinian and Yanshanian intrusive rock masses control the distribution of orogenic deposits. In this area, the thickness of iron ore body is 0.90 ~ 5.91 m ~ (-1) TFE grade 21.85 ~ 44.34, the thickness of lead and zinc orebody is 0.10 ~ 5.45 m ~ (-1) Zn grade 0.79 and 0.79% ~ (13. 60) Pb grade 0.63 ~ 6.88, which has a good prospecting prospect. (4) the Xiaoyuanshan iron polymetallic deposit is a typical skarn deposit related to acid magma. Controlled by specific carbonate rock, fault structure and magmatic hydrothermal activity. On the basis of the above analysis, it is further considered that the geomagnetic anomaly area and the sediment element anomaly superposition area of the drainage system, the Ordovician Silurian Tanjianshan Group, the Carboniferous Shihuizi formation, the great faults and their adjacent fracture zones, The magmatic intrusive zone is an important ore-prospecting site in the mining area, which is worthy of further work.
【作者單位】: 青海省核工業(yè)地質局;南華大學環(huán)境保護與安全工程學院;青海省柴達木綜合地質礦產勘查院;
【基金】:南華大學科研啟動基金項目(編號:2014XQ11)
【分類號】:P618.2
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