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Fluid inclusion and thermodynamic st...

Jin, Qi.

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Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China./
作者:	Jin, Qi.
面頁冊數:	257 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3963.
Contained By:	Dissertation Abstracts International59-08B.
標題:	Geochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9901895
ISBN:	9780591989946

Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China.
Jin, Qi.

Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China. - 257 p.

Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3963.

Thesis (Ph.D.)--The University of Texas at Dallas, 1998.

The Dalingkou ore deposit is a very important Ag, Pb, and Zn ore deposit in southeastern China and is being mined from seven levels. The ore bodies occur as vein type in faults. Ore body #1-1 is the most important with mineralization divided into three stages: (I) quartz-sulfide; (II) sulfide; and (III) fluorite. Sulfide stage is the most important with the main ore minerals: galena, sphalerite, and argentite. The three mineralization stages have different averages of homogenization temperature, salinity, and density. They are: 289.1$\sp\circ$C, 4.95 wt.% NaCl, and 0.781 g/cm$\sp3$ for stage I; 202.2$\sp\circ$C, 2.67 wt.% NaCl, and 0.884 g/cm$\sp3$ for stage II; and 151.7$\sp\circ$C, 1.44 wt.% NaCl, and 0.927 g/cm$\sp3$ for stage III, respectively. From mining level 7 (surface) to mining level 1 (deepest, 600 meters), the homogenization temperature, salinity, and density increase in stage III and decrease in the stages I and II.

ISBN: 9780591989946Subjects--Topical Terms:

539092
Geochemistry.

Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China.
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245 1 0 $a Fluid inclusion and thermodynamic studies of the Dalingkou Ag, Pb, and Zn ore deposit, Peoples Republic of China.
300 $a 257 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3963.
500 $a Supervisor: James L. Carter.
502 $a Thesis (Ph.D.)--The University of Texas at Dallas, 1998.
520 $a The Dalingkou ore deposit is a very important Ag, Pb, and Zn ore deposit in southeastern China and is being mined from seven levels. The ore bodies occur as vein type in faults. Ore body #1-1 is the most important with mineralization divided into three stages: (I) quartz-sulfide; (II) sulfide; and (III) fluorite. Sulfide stage is the most important with the main ore minerals: galena, sphalerite, and argentite. The three mineralization stages have different averages of homogenization temperature, salinity, and density. They are: 289.1$\sp\circ$C, 4.95 wt.% NaCl, and 0.781 g/cm$\sp3$ for stage I; 202.2$\sp\circ$C, 2.67 wt.% NaCl, and 0.884 g/cm$\sp3$ for stage II; and 151.7$\sp\circ$C, 1.44 wt.% NaCl, and 0.927 g/cm$\sp3$ for stage III, respectively. From mining level 7 (surface) to mining level 1 (deepest, 600 meters), the homogenization temperature, salinity, and density increase in stage III and decrease in the stages I and II.
520 $a The main species in the liquid phase of primary fluid inclusions are Na$\sp+$, K$\sp+$, Ca$\sp{2+}$, Mg$\sp{2+}$, F$\sp-$, Cl$\sp-$, and SO$\sb4\sp2-$ and in the gaseous phase are CO$\sb2$, CH$\sb4$, CO, and H$\sb2$O. The average pressure in stage II is 127 bars and in stage III, 121 bars, representing ore-forming depths of 480 meters and 457 meters, respectively. The average log fs$\sb2$ and log fo$\sb2$ are $-$7.77 and $-$32.52 for stage I and $-$12.49 and $-$45.46 for stage II, respectively. The ionic strengths are 0.888, 0.566, and 0.068 for stages I, II, and III, respectively. Total concentration of sulfur is 0.034 m for stage I and 0.083 m for stage II. pH is 4.36 for stage I and 4.98 for stage II.
520 $a The solubilities of the three main ore minerals, galena, sphalerite, and argentite, were controlled mainly by T, pH, m$\sb{\Sigma\sb{\rm s}}$, and m$\sb{\rm Cl\sp-}.$ Temperature is the most important. Hydrogen and oxygen isotopes reveal that the ore-forming fluids essentially are a mixture of magmatic and meteoric water. Lead isotope results suggest that the ore-forming lead came from the upper cratonized crust. Sulfur isotopic and REE analyses suggest that sulfur and other ore-forming substances are related primarily to the rhyolite porphyry host rock.
520 $a Based on lead isotopic compositions, the ore deposit-forming age is between 84 and 99 m.y. with an average of 91.5 m.y.
520 $a The Dalingkou ore deposit is a typical vein-type, hydrothermal, sulfide ore deposit.
590 $a School code: 0382.
650 4 $a Geochemistry. $3 539092
650 4 $a Geology. $3 516570
650 4 $a Mineralogy. $3 516743
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710 2 $a The University of Texas at Dallas. $3 1018411
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793 $a English
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