scholarly journals Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Yan Zhang ◽  
Runsheng Han ◽  
Shuming Wen ◽  
Pingtang Wei
Keyword(s):  
Southwest China ◽  
Copper Deposit ◽  
Ore Deposits ◽  
Diagram Method ◽  
Ore Body ◽  
Forming Temperature ◽  
Thermodynamic Phase Diagram ◽  
Mineral Zoning ◽  
Thermodynamic Phase ◽  
Genesis Of Ore Deposits

The Chuxiong basin, located in southwest China, is well known as a mineralization area of red-bed type copper deposits in China. These deposits are characterized by mineral zoning, which is especially true for the Dayao deposits. The mineral zoning is consistent for both horizontal and vertical zoning; from the base (center) of the ore body to the top (outermost), the mineral zones are from hematite, chalcocite, chalcocite + bornite, and bornite + chalcopyrite to pyrite. We studied the mineral zoning in detail using a thermodynamic phase diagram method, such as log⁡fO2-log⁡fS2, pH-log⁡fO2, and pH-Eh, and discussed the constraints on the order of the minerals precipitation under different physiochemical conditions. It is indicated that changes in temperature have little effect on pH and Eh in the formation of minerals. S2− is stable only below 473 K, and the forming temperature of chalcocite must be below 473 K. In this paper, we also explain the mineral zoning formation mechanism and propose that the main controlling factor of mineral zoning is pH. Because this mineral zoning is widespread in sediment-hosted deposits, studies on this mechanism can considerably promote better understanding of the genesis of ore deposits in order to guide the exploration.

Thermodynamic phase diagram analysis of three binary systems shared by five neopentane derivatives

Calphad ◽  
1994 ◽  
Vol 18 (4) ◽  
pp. 387-396 ◽  
Author(s):  
D.O. López ◽  
J. Van Braak ◽  
J.L.L. Tamarit ◽  
H.A.J. Oonk
Keyword(s):  
Phase Diagram ◽  
Binary Systems ◽  
Thermodynamic Phase Diagram ◽  
Thermodynamic Phase ◽  
Diagram Analysis

Basics of Metals Theory of Extraction by Means of Chemical Water Solutions Filtration through Underground Ores

2014 ◽  
Vol 1020 ◽  
pp. 472-477 ◽  
Author(s):  
Vruyr Sargsyan ◽  
Emil Saratikyan
Keyword(s):  
Molecular Diffusion ◽  
Water Saturation ◽  
Water Injection ◽  
Mining Industry ◽  
Extraction Methods ◽  
Ore Deposits ◽  
Metal Salts ◽  
Chemical Reagents ◽  
Ore Body ◽  
Waste Dumps

Abstract. Geo-technological extraction methods recently are widely used in the mining industry. Removing the metals from underground ore deposits is carried out by injecting chemicals (solvents, oxidants, reducing agents) into wells drilled in them, and the subsequent extraction of metals from saturated solutions. Particularly, this method utilized for the extraction of uranium from flooded sediments and copper from poor (substandard) ores, as well as some non-ferrous and rare metals from waste dumps and tailings of substandard ore mines and processing enterprises. The paper discusses methods developed for prediction of moisture content (water saturation) in rocks under filtration of liquid with incomplete saturation of pores while changing the concentration of the metal in the liquid phase (in an ore body), as well as problems of dissolution and desorption of metal salts on the surface cracks or pores on ore body based on molecular diffusion equation of metal salts. The present work conducted for developing the methods for calculating the liquid filtration through underground deposits of minerals and forecasting of dissolving and washing out metals. It is shown that the processes which take place with the use of chemical reagents are different comparing to the similar processes with water injection. These data allow to predict the changes in the concentration of salts and metals in the liquid and solid phases depending on time.

The Pulang Porphyry Copper Deposit and Associated Felsic Intrusions in Yunnan Province, Southwest China

2011 ◽  
Vol 106 (1) ◽  
pp. 79-92 ◽  
Author(s):  
L. Wenchang ◽  
Z. Pusheng ◽  
H. Zengqian ◽  
N. C. White
Keyword(s):  
Yunnan Province ◽  
Southwest China ◽  
Porphyry Copper ◽  
Copper Deposit ◽  
Porphyry Copper Deposit

Thermodynamic Phase Diagram, Half-Metallic and Optical Properties of the Zr2TiSi [111] Films Based on DFT

Silicon ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2165-2178
Author(s):  
Nosrat-Ali Vahabzadeh ◽  
Arash Boochani ◽  
Seyed Mohammad Elahi ◽  
Hossein Akbari
Keyword(s):  
Phase Diagram ◽  
Optical Properties ◽  
Half Metallic ◽  
Thermodynamic Phase Diagram ◽  
Thermodynamic Phase
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