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Study on the Geological Features and Analysis of Xi’anli Iron Desposit

Author: GaoPo
Tutor: LiuJianChao
School: Chang'an University
Course: Structural Geology
Keywords: Pingshun area Skarn iron deposit orefield and ore deposit geology origin
CLC: P618.31
Type: Master's thesis
Year: 2011
Downloads: 93
Quote: 0
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Abstract


Located in the south Shanxi province, Pingshun area is an important locality for skarn iron deposits in the North China. Pingshun’s skarn iron deposits are rich in high-quality iron ore, having intrusive rocks with a great outcrop area, so it is advantageous to our study. With diverse shapes and different scale, the ore bodies are hosted along the contact belt between the intrusives and carbonate rocks. Folds, faults and contact zones are the dominating ore control and host structures. The ore type is monotonous magnetite. The mineralization and alteration are characterized by obvious zoning.The article bases on the geological setting, researching on the point of characteristics of typical Fe desposit, Ore-forming fluid, Emplacement method, Alteration features, Ore sources and Migration of Xi’an li,as a result,we have the understanding as follows:1.The wall rock of the rock is Middle Ordovician carbonate which have the alternating layers of marl and limestone, Mineralization is controlled by the more brittle and pure limestone and its mainly into the seam position is the stratum of O22,the second is O24.2.The mainly ore rock is the late intrusions.But the early intrusions also provided a source of material indirectly.3. Based on the analysis of the characteristics of ore-bearing stratum, the distribution of elements of the mineralization alteration zone, physical and chemical conditions of the deposit and the ore sources,analyzed the causes of the deposit and proposed mineralization model.4.It is pointed out that the first and second tectonomagmatic belt with different mechanisms of emplacement have influence on the formation of ore deposits. The first belt belongs to positive emplacement mechanism. Within the pluton,the ore bodies show themselves as xenoliths, and there is the metallogenic potential far away from the contact zone between the intrusives and the carbonate rock while the second belt belongs to the passive emplacement mechanism. The xenoliths seldom occurs within the intrusive rocks, neither does the ore xenoliths. The iron deposits are mainly hosted along the contact zone between the intrusives and the carbonate rock, a minority within the carbonate country rocks.5.Coupling between fold and fault determined the equidistant distribution of magmatic rocks and control the formation and location of iron ore, with the features of distribution range from 4 to 5km.6. The structure of north-south control the output of magmatic rocks.The favorable parts of the mineralization is the cross-node of two fault where magmatic activity is strong.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Ferrous metals > Iron
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