Study on the PTX Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China

To better understand the nanopore characteristics and their effects on methane adsorption capacity of shales, we performed fractal analysis of nine shale samples collected from the fifth member of Upper Triassic Xujiahe Formation in the Sichuan Basin, southwest China. [Formula: see text] adsorption results show that shales have different adsorption characteristics at relative pressure of 0–0.5 and 0.5–1. Two fractal dimensions [Formula: see text] and [Formula: see text] were calculated using the Frenkel–Halsey–Hill (FHH) equation. Results show that the methane adsorption capacity increases with the increase of [Formula: see text] and [Formula: see text], of which [Formula: see text] has a more significant influence on adsorption capacity than [Formula: see text]. Further studies indicate that [Formula: see text] represents the pore surface fractal characteristics caused by the irregularity of shale surface, whereas [Formula: see text] represents the pore structure fractal characteristics, which is mainly affected by shale components (e.g. TOC, clay minerals) and pore parameters (e.g. average pore diameter, micropores content). A higher [Formula: see text] corresponds to a more irregular pore surface, which provides more space for methane adsorption. While a higher [Formula: see text] indicates a more complex pore structure and a stronger capillary condensation action on the pore surface, which in turn enhances the methane adsorption capacity.

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The Zhaotong Native Copper Deposit Associated with the Permian Emeishan Flood Basalts, Yunnan, Southwest China

International Geology Review ◽

10.2747/0020-6814.48.8.742 ◽

2006 ◽

Vol 48 (8) ◽

pp. 742-753 ◽

Cited By ~ 7

Author(s):

Christina Yan Wang ◽

Mie-Fu Zhou ◽

Liang Qi ◽

Shuguang Hou ◽

Hongguang Gao ◽

...

Keyword(s):

Southwest China ◽

Copper Deposit ◽

Flood Basalts ◽

Native Copper

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Diagenesis-Mineralization and Ore Prospecting of the Yangla Copper Deposit, Yunnan Province, Southwest China

Acta Geologica Sinica - English Edition ◽

10.1111/1755-6724.12579 ◽

2015 ◽

Vol 89 (5) ◽

pp. 1766-1766 ◽

Cited By ~ 1

Author(s):

LI Bo ◽

HUANG Zhilong ◽

ZHOU Jiaxi ◽

ZOU Guofu ◽

TANG Guo ◽

...

Keyword(s):

Yunnan Province ◽

Southwest China ◽

Copper Deposit ◽

Ore Prospecting

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Application of fractal models to delineate mineralized zones in the Pulang porphyry copper deposit, Yunnan, Southwest China

10.5194/npg-2019-8 ◽

2019 ◽

Author(s):

Xiaochen Wang ◽

Qinglin Xia ◽

Tongfei Li ◽

Shuai Leng ◽

Yanling Li ◽

...

Keyword(s):

Southwest China ◽

Porphyry Copper ◽

Copper Deposit ◽

Fast Fourier Transformation ◽

High Grade ◽

Threshold Values ◽

Volume Model ◽

Fractal Models ◽

Supergene Enrichment ◽

Geologic Model

Abstract. The purpose of the paper is to depict various mineralized zones and the barren host rock in accordance with the subsurface and surface lithogeochemical data using the concentration-volume (C-V) and power spectrum-volume (S-V) fractal models within the Pulang copper deposit, southwest China. Results obtained by concentration-volume model depict four geochemical zones defined by Cu thresholds of 0.25 %, 1.38 % and 1.88 %, which represent non-mineralized wall rocks (Cu 1.88 %). S-V model is utilized by performing 3D fast Fourier transformation for assay data in the frequency domain. The S-V method indicates three mineralized zones characterized by Cu threshold values of 0.23 % and 1.33 %. The zones of 1.33 % Cu represent supergene enrichment zones. Both the multifractal models show that high grade mineralization is located at the center and south of Pulang deposit. The results are in contrast with alteration and mineralogical models resulted from the 3D geologic model utilizing the logratio matrix method. Better results were obtained from S-V model to delineate high grade mineralization of Pulang deposit. However, results of C-V method of moderate and weak grade mineralization are more precise than the results gained from S-V method.

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Late Paleoproterozoic to Early Mesoproterozoic Tangdan Sedimentary Rock-Hosted Strata-bound Copper Deposit, Yunnan Province, Southwest China

Economic Geology ◽

10.2113/econgeo.107.2.357 ◽

2012 ◽

Vol 107 (2) ◽

pp. 357-375 ◽

Cited By ~ 21

Author(s):

X.-F. Zhao ◽

M.-F. Zhou ◽

M. W. Hitzman ◽

J.-W. Li ◽

M. Bennett ◽

...

Keyword(s):

Sedimentary Rock ◽

Yunnan Province ◽

Southwest China ◽

Copper Deposit

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

Geofluids ◽

10.1155/2018/4261795 ◽

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.

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SEM analysis of the change in the reaction rates with deposit structures in the copper-iron cementation system

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100109422 ◽

1978 ◽

Vol 36 (1) ◽

pp. 456-457

Author(s):

V. Annamalai ◽

L.E. Murr

Keyword(s):

Structural Characteristics ◽

Secondary Electron Emission ◽

Copper Deposit ◽

Reaction Rates ◽

Sem Analysis ◽

Experimental Conditions ◽

Major Drawback ◽

Emission Mode ◽

Scrap Iron ◽

Image Position

Economical recovery of copper metal from leach liquors has been carried out by the simple process of cementing copper onto a suitable substrate metal, such as scrap-iron, since the 16th century. The process has, however, a major drawback of consuming more iron than stoichiometrically needed by the reaction.Therefore, many research groups started looking into the process more closely. Though it is accepted that the structural characteristics of the resultant copper deposit cause changes in reaction rates for various experimental conditions, not many systems have been systematically investigated. This paper examines the deposit structures and the kinetic data, and explains the correlations between them.A simple cementation cell along with rotating discs of pure iron (99.9%) were employed in this study to obtain the kinetic results The resultant copper deposits were studied in a Hitachi Perkin-Elmer HHS-2R scanning electron microscope operated at 25kV in the secondary electron emission mode.

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