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The Origin of High Cu/S Sulfides in ...

Li, Chao.

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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Origin of High Cu/S Sulfides in the Skaergaard Intrusion, East Greenland./
作者:	Li, Chao.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	87 p.
附註:	Source: Masters Abstracts International, Volume: 56-04.
Contained By:	Masters Abstracts International56-04(E).
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10259977
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. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 87 p.

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

Thesis (M.S.)--Duke University, 2017.

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.

ISBN: 9781369808971Subjects--Topical Terms:

516570
Geology.

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