Rare-earth element geochemistry of clastic and chemical metasedimentary rocks associated with hydrothermal sulphide mineralisation in the Olary Block, South Australia

1995 ◽  
Vol 122 (1-4) ◽  
pp. 77-98 ◽  
Author(s):  
F.P. Bierlein
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
South Australia ◽  
Element Geochemistry ◽  
Metasedimentary Rocks ◽  
Sulphide Mineralisation ◽  
Hydrothermal Sulphide

scholarly journals Petrology and rare earth element geochemistry of clastic metasedimentary rocks from the Isua supracrustal belt, West Greenland

1983 ◽  
Vol 112 ◽  
pp. 23-33
Author(s):  
J.L Boak ◽  
R.F Dymek ◽  
L.P Gromet
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Thermal Gradients ◽  
Element Geochemistry ◽  
Metasedimentary Rocks ◽  
Sediment Types ◽  
Supracrustal Belt ◽  
Shallow Basin ◽  
Ree Patterns

An investigation of the petrology and rare-earth element (REE) geochemistry of clastic metasedimentary rocks from the ~ 3800 Ma Isua Supracrustal Belt has been carried out to provide constraints on the nature of early Archaean metamorphie regimes and on the sources of their sedimentary protolith. The assemblages garnet + staurolite + biotite and biotite + kyanite (both with qtz + muse + plag + Hm) characterize the Isua metasediments and represent types common in younger metamorphic belts. Secondary chlorite and sericite occur in most samples. Garnet-biotite geothermometry indicates T = 541 ± 43°C for prograde metamorphism and T = 464 ± 39°C for retrograde metamorphism. Suggested metamorphic conditions of T - 550°C and P - 5 Kb imply burial to at least 15 Km with metamorphic thermal gradients < 40°C/Km. These data argue against excessively steep early Archaean crustal thermal gradients. REE patterns for three museovite-biotite gneisses are strongly fractionated (CeN = 40-100; YbN = 2-8) with variable Eu-anomalies (Eu/Eu* = 0.48-0.95), not unlike patterns for Arehaean felsic voicanic rocks in other areas. Garnet-biotite sehists have less-fractionated light REE, and exhibit a slope reversal for the heavy REE (i.e., GdN< YbN. These most plausibly represent a mixed felsic-mafic (- ultramafic?) protolith. Both sediment types could be the erosion produets of a rapidly emergent voicanic structure shedding debris into a shallow basin.

Rare earth element geochemistry of feldspars: examples from Fe-oxide Cu-Au systems in the Olympic Cu-Au Province, South Australia

2017 ◽  
Vol 112 (2) ◽  
pp. 145-172 ◽  
Author(s):  
Alkis Kontonikas-Charos ◽  
Cristiana L. Ciobanu ◽  
Nigel J. Cook ◽  
Kathy Ehrig ◽  
Sasha Krneta ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
South Australia ◽  
Element Geochemistry ◽  
Fe Oxide

Trace and rare earth element geochemistry of Jurassic mudstones in the northern Qaidam Basin, northwest China

Geochemistry ◽  
2012 ◽  
Vol 72 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Jian Cao ◽  
Ming Wu ◽  
Yan Chen ◽  
Kai Hu ◽  
Lizeng Bian ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Qaidam Basin ◽  
Northwest China ◽  
Element Geochemistry
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