The Karouni Gold Deposit, Guyana, South America: Part II. Hydrothermal Alteration and Mineralization

2018 ◽  
Vol 113 (8) ◽  
pp. 1705-1732 ◽  
Author(s):  
Michael Tedeschi ◽  
Steffen G. Hagemann ◽  
Malcolm P. Roberts ◽  
Noreen J. Evans
Keyword(s):  
South America ◽  
Gold Deposit ◽  
Hydrothermal Alteration

The Yatela gold deposit in Mali, West Africa: The final product of a long-lived history of hydrothermal alteration and weathering

2016 ◽  
Vol 113 ◽  
pp. 73-87 ◽  
Author(s):  
Quentin Masurel ◽  
John Miller ◽  
Kim A.A. Hein ◽  
Eric Hanssen ◽  
Nicolas Thébaud ◽  
...  
Keyword(s):  
West Africa ◽  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
History Of

Vanadian allanite-(La) and Vanadian allanite-(Ce) from the Hemlo gold deposit, Ontario, Canada

1991 ◽  
Vol 55 (381) ◽  
pp. 497-507 ◽  
Author(s):  
Yuanming Pan ◽  
Michael E. Fleet
Keyword(s):  
Solid State ◽  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
Direct Contact ◽  
Close Association ◽  
Octahedral Coordination ◽  
Local Source ◽  
Minor Constituent ◽  
Simple Substitution ◽  
A Minor

AbstractAllanite-(La) (containing up to 7.80 wt.% V2O3 and with La/ΣREE and La/Ce atomic ratios up to 0.54 and 1.45, respectively) and allanite-(Ce) (up to 8.46 wt.% V2O3) occur in close association with vanadian muscovite, barian tomichite and vanadian titanite in the main ore zone of the Hemlo gold deposit, Ontario, Canada. Allanite-(Ce) generally occurs as a minor constituent in cross-cutting veins or along foliation planes, whereas allanite-(La) invariably occurs in direct contact with titanite. The high V concentrations in the allanites from Hemlo are readily attributable to an adequate local source of this element, and are most likely controlled mainly by a simple substitution of V for Al in octahedral coordination. Vanadian allanite-(La) and vanadian allanite-(Ce), without any systematic differences in other constituents, are clearly distinct in REE composition, in respect to both the relative concentrations of La and Ce and abundances of other REE. The formation of both allanites (Ce- and La-rich) indicates very localised remobilisation and concentration of REE during a late hydrothermal alteration. The unusual REE composition of vanadian allanite-(La) directly reflects partitioning of REE with coexisting titanite, and the formation of this unusual phase may be attributable to replacement of earlier titanite with redistribution of REE in the solid state.

Hydrothermal alteration and element migration in the Yufeng gold deposit, Eastern Tianshan Orogen

2020 ◽  
Vol 36 (5) ◽  
pp. 1597-1610
Author(s):  
YU LiDong ◽  
◽  
SUN HaiWei ◽  
ZHANG Jing ◽  
HE XiHeng ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
Eastern Tianshan ◽  
Element Migration

A Palaeoproterozoic multi-stage hydrothermal alteration system at Nalunaq gold deposit, South Greenland

2016 ◽  
Vol 52 (3) ◽  
pp. 383-404 ◽  
Author(s):  
Robin-Marie Bell ◽  
Jochen Kolb ◽  
Tod Earle Waight ◽  
Leon Bagas ◽  
Tonny B. Thomsen
Keyword(s):  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
Multi Stage

Hydrothermal alteration at the Magdala gold deposit, Stawell, western Victoria

2006 ◽  
Vol 53 (5) ◽  
pp. 733-757 ◽  
Author(s):  
A. L. Dugdale ◽  
C. J. L. Wilson ◽  
R. J. Squire
Keyword(s):  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
Western Victoria
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