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A genetic link between the gold-merc...

Lu, Guanqing.

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A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit./
Author:	Lu, Guanqing.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
Description:	239 p.
Notes:	Source: Dissertation Abstracts International, Volume: 55-12, Section: B, page: 5246.
Contained By:	Dissertation Abstracts International55-12B.
Subject:	Geochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN92586
ISBN:	9780315925861

A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit.
Lu, Guanqing.

A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 239 p.

Source: Dissertation Abstracts International, Volume: 55-12, Section: B, page: 5246.

Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 1994.

The Danzhai gold-mercury deposit is situated in the eastern region of Guizhou province, southwest of P. R. China. The Danzhai deposit is one of the gold-mercury-antimony-barite deposits in the Sandou-Danzhai ore belt, which is controlled by regional fault system F$\sb1$.

ISBN: 9780315925861Subjects--Topical Terms:

539092
Geochemistry.

A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit.
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100 1 $a Lu, Guanqing. $3 3283589
245 1 2 $a A genetic link between the gold-mercury mineralization and petroleum evolution: A case of the Danzhai gold-mercury deposit.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1994
300 $a 239 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-12, Section: B, page: 5246.
500 $a Adviser: Jayanta Guha.
502 $a Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 1994.
520 $a The Danzhai gold-mercury deposit is situated in the eastern region of Guizhou province, southwest of P. R. China. The Danzhai deposit is one of the gold-mercury-antimony-barite deposits in the Sandou-Danzhai ore belt, which is controlled by regional fault system F$\sb1$.
520 $a A number of gold-mercury-antimony-barite deposits are distributed in or around the Majiang-Danzhai oil trap, and all of these deposits are present under the ancient interface between petroleum and oilfield brine ($-$500 m). Field observation shows that a variety of forms of hydrocarbon occur not only in the host carbonates but in the ore deposit as well. Patch-like bitumen, veinlet bitumen as well as stylolite-like bitumen host sulfide minerals such as arsenopyrite and cinnabar while metal sulfides such as cinnabar and gangue minerals also host bitumen. Besides bitumen, paraffin wax is also found in the deposit. An organic petrography study demonstrates that the bitumen in the minerals from the deposit is identical to the bitumen in the former Majiang-Danzhai oil trap. The bitumen is actually pyrobitumen, with a high reflectance, a mosaic texture, and an anisotropic nature but without fluorescence. The reflectance of bitumen from the deposit is high, varying from 2 to 3.8%, and the temperature calculated from this reflectance ranges from 150 to 210$\sp\circ$C, indicating that the petroleum in the Majiang-Danzhai oil trap reached the thermal natural gas stage.
520 $a Fluid inclusion examination reveals important information about the ore-forming fluids. A variety of hydrocarbon inclusions are identified, including: (1) liquid methane inclusions; (2) bitumen inclusions; (3) paraffin wax inclusions; (4) heavy oil inclusions, and various combinations. Liquid methane inclusions are found in both metallic minerals such as cinnabar and realgar and gangue minerals such as quartz, calcite, dolomite and barite. The heavy oil inclusions are more abundant in carbonate minerals such as calcite and dolomite than in other minerals such as quartz and cinnabar. The spatial relationship between the liquid methane inclusions and cinnabar and realgar demonstrates that the hydrocarbon inclusions are a significant part of ore-forming fluid. The homogenization temperatures of aqueous inclusions range from 130-210$\sp\circ$C and the salinities detected from 5.2-19.3 wt.% NaCl equivalent. Solid probe mass spectrometry confirms that hydrocarbons, particularly methane, are the most important constituent of the fluid inclusions. The methane in some inclusions is as high as 69.8 mole percent. Some heavy hydrocarbon molecules are also detected by the mass spectra. The spectra of a sample from the second stage of mineralization displays a complete separation indicating a dominant unmixing of the CH$\sb4$ and H$\sb2$O phases.
520 $a Argon isotope data of three quartz samples from the Danzhai gold-mercury deposit show that the initial ($\sp{40}$Ar/$\sp{36}$Ar)$\sb0$ value is much higher than 295.5, the ($\sp{40}$Ar/$\sp{36}$Ar)$\sb0$ value of modern atmosphere, which is common in most formation waters or oilfield brines. The isochron ages for the three quartz samples are 2783 Ma, 3047 Ma and 2250 Ma respectively, which are obviously much older than reasonable mineralization age, even much older than that of Cambrian and Ordovician host sedimentary rocks. This high excess argon is interpreted to be the result of the formation water or oilfield brine leaching radiogenic $\sp{40}$Ar from the Lower Cambrian black shale, subsequently precipitated in the Danzhai gold-mercury deposit. (Abstract shortened by UMI.).
590 $a School code: 0862.
650 4 $a Geochemistry. $3 539092
650 4 $a Mineralogy. $3 516743
690 $a 0996
690 $a 0411
710 2 $a Universite du Quebec a Chicoutimi (Canada). $3 1032071
773 0 $t Dissertation Abstracts International $g 55-12B.
790 $a 0862
791 $a Ph.D.
792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN92586