关键词: 环形遥感影像, 大型超大型矿床, 找矿勘查, 中亚, 新疆

Abstract:

 There are many Gobi, desert, sand dunes in Central Asia, which provide more chances for remote sensing geological exploration. Some large or super large deposits have been found in Central Asia metallogenic zone and the remote sensing characteristics of them have been attracted great attention. We have analyzed and researched the remote sensing geology of some typical ore deposits in Central Asia by using the ETM+ data from the USA Landsat No.7, such as Muruntau giant gold deposits in Uzbekistan, Kounrad and Aktogai super largesized copper deposits in Kazakhstan, Oyu Tolgoi super largesized coppergold deposits in Mongolia and ChagangnuoerZhibo iron deposits in western Tianshan in Xinjiang, and have drawn a conclusion that some famous large or super large porphyry copper and gold deposits and volcanic iron deposits have deep relationship with circular structures several kms to tens of kms in diameter in the remote sensing image, and the deposits are mostly located in the margin of these circular structures. A very clear circular structure in the remote sensing image of Kusongmuqieke in western Tianshan in Xinjiang has been found which has the area of 2.9×2.3 km3. It has been confirmed as a tectonicmagmatic thermal dome by cross geological section survey. The dolomite and marble are located in the core, and the polymictic carbonate rock and fine grained clastic rocks are located in the marginal part. There are extrovergent normal faults between the core and the marginal part, and silicification and pyrite widely developed along faults. The circular structure found in the remote sensing image of Kusongmuqieke is coincided with the aeromagnetic composite anomaly, as well as the Co - Ni - W - Mo - Cu - Zn - Pb - Sb - Ag geochemical assemblage anomaly. There may be some very important prospecting targets of porphyryskarn type, or carlin/carlinlike type, or MVT copper, gold, iron, leadzinc large deposits. Therefore, the circular structure should be used fully and reasonably in some relatively large or super large mineral deposit exploration in the central and northern areas in Xinjiang.

Key words: circular structure, large or super large deposits, metal deposits exploration, Central Asia, Xinjiang