Contrasting oxygen fugacity of I- and S-type granites from the Araçuaí orogen, SE Brazil: an approach based on opaque mineral assemblages

2019 ◽  
Vol 113 (5) ◽  
pp. 667-686 ◽  
Author(s):  
Jordania Cristina dos Santos Dias ◽  
Leonardo Gonçalves ◽  
Cristiane C. Gonçalves
Keyword(s):  
Oxygen Fugacity ◽  
Opaque Mineral ◽  
Se Brazil ◽  
Mineral Assemblages ◽  
Araçuaí Orogen

Chapter 49 The Neoproterozoic Macaúbas Group, Araçuaí orogen, SE Brazil

2011 ◽  
Vol 36 (1) ◽  
pp. 523-534 ◽  
Author(s):  
A. C. Pedrosa-Soares ◽  
Marly Babinski ◽  
Carlos Noce ◽  
Maximiliano Martins ◽  
Gláucia Queiroga ◽  
...  
Keyword(s):  
Se Brazil ◽  
Araçuaí Orogen

Paleoproterozoic sources for Cordilleran-type Neoproterozoic granitoids from the Araçuaí orogen (SE Brazil): Constraints from Hf isotope zircon composition

Lithos ◽  
2020 ◽  
Vol 378-379 ◽  
pp. 105815
Author(s):  
Mathias Schannor ◽  
Cristiano Lana ◽  
Ariela Mazoz ◽  
Francesco Narduzzi ◽  
Kathryn Cutts ◽  
...  
Keyword(s):  
Hf Isotope ◽  
Se Brazil ◽  
Araçuaí Orogen

Provenance shift through time in superposed basins: From Early Cryogenian glaciomarine to Late Ediacaran orogenic sedimentations (Araçuaí Orogen, SE Brazil)

2020 ◽  
Vol 87 ◽  
pp. 41-66
Author(s):  
Marco Paulo De Castro ◽  
Gláucia Nascimento Queiroga ◽  
Maximiliano Martins ◽  
Antonio Carlos Pedrosa-Soares ◽  
Leon Dias ◽  
...  
Keyword(s):  
Se Brazil ◽  
Araçuaí Orogen

The Ribeirão da Folha ophiolite-bearing accretionary wedge (Araçuaí orogen, SE Brazil): New data for Cryogenian plagiogranite and metasedimentary rocks

2020 ◽  
Vol 336 ◽  
pp. 105522 ◽  
Author(s):  
Leandro Amaral ◽  
Fabrício de Andrade Caxito ◽  
Antonio Carlos Pedrosa-Soares ◽  
Gláucia Queiroga ◽  
Marly Babinski ◽  
...  
Keyword(s):  
Accretionary Wedge ◽  
Metasedimentary Rocks ◽  
Se Brazil ◽  
Araçuaí Orogen

The Rio Doce Group revisited: An Ediacaran arc-related volcano-sedimentary basin, Araçuaí orogen (SE Brazil)

2018 ◽  
Vol 85 ◽  
pp. 345-361 ◽  
Author(s):  
Tiago Amâncio Novo ◽  
Antonio Pedrosa-Soares ◽  
Valter Salino Vieira ◽  
Ivo Dussin ◽  
Luiz Carlos da Silva
Keyword(s):  
Sedimentary Basin ◽  
Se Brazil ◽  
Araçuaí Orogen

The hyper-agpaitic stage in the evolution of the Ilímaussaq alkaline complex, South Greenland

2001 ◽  
pp. 83-94 ◽  
Author(s):  
Henning Sørensen ◽  
Lotte Melchior Larsen
Keyword(s):  
Oxygen Fugacity ◽  
Volcanic Rocks ◽  
Alkaline Complex ◽  
Mineral Association ◽  
Original Series ◽  
Pressure Oxygen ◽  
Mineral Associations ◽  
Mineral Assemblages ◽  
Hydrothermal Veins ◽  
Highly Evolved

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Sørensen , H., & Melchior Larsen, L. (2001). The hyper-agpaitic stage in the evolution of the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin, 190, 83-94. https://doi.org/10.34194/ggub.v190.5177 _______________ The term hyper-agpaitic covers mineral associations characterised by a wealth of Na-rich minerals such as natrosilite, zirsinalite, ussingite, vuonnemite, vitusite and lomonosovite. This mineral association clearly indicates a higher degree of alkalinity than for agpaitic rocks in general. In the Ilímaussaq complex hyper-agpaitic mineral associations occur not only in pegmatites and hydrothermal veins as in the Kola complexes, Khibina and Lovozero, but also in highly evolved lujavrites and in the fenitised volcanic rocks in the roof of the complex. This paper reviews the occurrences of hyper-agpaitic mineral associations in the Ilímaussaq complex. The mineral assemblages are determined by an interplay of temperature, pressure, oxygen fugacity, alkalinity, especially the concentration of Na, and contents of elements such as Zr, Ti, Nb, REE, Fe, Mn, U, Th, P, F, Cl and H2O. Increasing and decreasing stages of alkalinity may be distinguished. At increasing alkalinity nepheline is for instance substituted by naujakasite, while at decreasing alkalinity and temperature naujakasite is substituted by analcime.

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