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The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland./
Author:	Li, Chao.
Description:	1 online resource (87 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-04.
Contained By:	Masters Abstracts International56-04(E).
Subject:	Geology. -
Online resource:	click for full text (PQDT)
ISBN:	9781369808971

The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland.
Li, Chao.

The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland. - 1 online resource (87 pages)

Source: Masters Abstracts International, Volume: 56-04.

Thesis (M.S.)

Includes bibliographical references

The Skaergaard Intrusion of East Greenland is unusual in that the trace sulfide assemblage is characterized by unusually high Cu/S ratios, containing abundant chalcopyrite and bornite (Cu5FeS4), the latter otherwise rare in most layered intrusions. Explanations for the high Cu/S ratio range from the parent magma inheriting low S concentration from the mantle source to suggestions that S was lost to hydrothermal fluids as the intrusion cooled. The sulfide assemblage beneath the Au- and PGE-rich Platinova Reef show the common replacement of the sulfide assemblage with a Ti-poor magnetite. A non-equilibrium thermodynamic analysis of modal variations is consistent with the general reaction of chalcopyrite → bornite + magnetite + S (lost) and that the original Cu:S mass ratio of the magma that crystallize the Lower Zone was ~1:1. In addition, a comparison with other hot spot and flood basalt provinces suggest that these magmas begin to degas while still at mantle depths and can lose significant S to shallow level degassing. It is concluded that degassing of the parent Skaergaard magma prior to solidification and continuous S loss during crystallization both contributed to the overall high Cu/S ratio of the Skaergaard system. More generally, variations in the Cu/S ratio of sulfides in basaltic systems may be a useful indicator of the extent of magma degassing.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369808971Subjects--Topical Terms:

670379
Geology.
Index Terms--Genre/Form:

554714
Electronic books.

The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland.
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100 1 $a Li, Chao. $3 795910
245 1 4 $a The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland.
264 0 $c 2017
300 $a 1 online resource (87 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 56-04.
500 $a Adviser: Alan Boudreau.
502 $a Thesis (M.S.) $c Duke University $d 2017.
504 $a Includes bibliographical references
520 $a The Skaergaard Intrusion of East Greenland is unusual in that the trace sulfide assemblage is characterized by unusually high Cu/S ratios, containing abundant chalcopyrite and bornite (Cu5FeS4), the latter otherwise rare in most layered intrusions. Explanations for the high Cu/S ratio range from the parent magma inheriting low S concentration from the mantle source to suggestions that S was lost to hydrothermal fluids as the intrusion cooled. The sulfide assemblage beneath the Au- and PGE-rich Platinova Reef show the common replacement of the sulfide assemblage with a Ti-poor magnetite. A non-equilibrium thermodynamic analysis of modal variations is consistent with the general reaction of chalcopyrite → bornite + magnetite + S (lost) and that the original Cu:S mass ratio of the magma that crystallize the Lower Zone was ~1:1. In addition, a comparison with other hot spot and flood basalt provinces suggest that these magmas begin to degas while still at mantle depths and can lose significant S to shallow level degassing. It is concluded that degassing of the parent Skaergaard magma prior to solidification and continuous S loss during crystallization both contributed to the overall high Cu/S ratio of the Skaergaard system. More generally, variations in the Cu/S ratio of sulfides in basaltic systems may be a useful indicator of the extent of magma degassing.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 670379
650 4 $a Geochemistry. $3 648291
650 4 $a Mineralogy. $3 670562
655 7 $a Electronic books. $2 local $3 554714
690 $a 0372
690 $a 0996
690 $a 0411
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Duke University. $b Earth and Ocean Sciences. $3 1183411
773 0 $t Masters Abstracts International $g 56-04(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10259977 $z click for full text (PQDT)