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The Origin of High Cu/S Sulfides in ...
~
Li, Chao.
The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland.
紀錄類型:
書目-語言資料,手稿 : Monograph/item
正題名/作者:
The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland./
作者:
Li, Chao.
面頁冊數:
1 online resource (87 pages)
附註:
Source: Masters Abstracts International, Volume: 56-04.
Contained By:
Masters Abstracts International56-04(E).
標題:
Geology. -
電子資源:
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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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.
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