P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil): Fluid inclusions, oxygen isotope thermometry, and phase relations

G. Morteani; R. M.S. Bello; A. L. Gandini; C. Preinfalk

P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil): Fluid inclusions, oxygen isotope thermometry, and phase relations

G. Morteani, R. M.S. Bello, A. L. Gandini, C. Preinfalk

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The intense orange-yellow to cherry-red topaz found in quartz, hematite, dolomite, euclase veins in the area of Ouro Preto (Minas Gerais, Brazil) is known in trade as "Imperial Topaz". Only pink topaz from the Mardan District in Pakistan has similar gemmological properties and paragenesis. Fluid inclusion data, oxygen isotope geothermometry and considerations on the stability of kaolinite, pyrophyllite and carbonates found as inclusions in the Imperial Topaz from Ouro Preto indicate that topaz crystallized at about 360°C and 3.5 kbar. A high CO₂ activity precluded flourination of the carbonates and stabilized topaz relative to fluorite. Flourine and beryllium, needed to form topaz and euclase, as well as CO₂ were presumably provided by metamorphic fluids produced by the Brasiliano tectonothermal event at about 600 Ma.

Original language	English
Pages (from-to)	455-466
Number of pages	12
Journal	Schweizerische Mineralogische und Petrographische Mitteilungen
Volume	82
Issue number	3
State	Published - 2002
Externally published	Yes

Keywords

Brazil
Imperial topaz
Metamorphism
Microthermometry
Oxygen isotope thermometry

Cite this

@article{d3ea23d4f7f845c682f70d08b7c5ef3e,

title = "P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil): Fluid inclusions, oxygen isotope thermometry, and phase relations",

abstract = "The intense orange-yellow to cherry-red topaz found in quartz, hematite, dolomite, euclase veins in the area of Ouro Preto (Minas Gerais, Brazil) is known in trade as {"}Imperial Topaz{"}. Only pink topaz from the Mardan District in Pakistan has similar gemmological properties and paragenesis. Fluid inclusion data, oxygen isotope geothermometry and considerations on the stability of kaolinite, pyrophyllite and carbonates found as inclusions in the Imperial Topaz from Ouro Preto indicate that topaz crystallized at about 360°C and 3.5 kbar. A high CO2 activity precluded flourination of the carbonates and stabilized topaz relative to fluorite. Flourine and beryllium, needed to form topaz and euclase, as well as CO2 were presumably provided by metamorphic fluids produced by the Brasiliano tectonothermal event at about 600 Ma.",

keywords = "Brazil, Imperial topaz, Metamorphism, Microthermometry, Oxygen isotope thermometry",

author = "G. Morteani and Bello, {R. M.S.} and Gandini, {A. L.} and C. Preinfalk",

year = "2002",

language = "English",

volume = "82",

pages = "455--466",

journal = "Schweizerische Mineralogische und Petrographische Mitteilungen",

issn = "0036-7699",

publisher = "Staeubi Verlag AG",

number = "3",

}

P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil): Fluid inclusions, oxygen isotope thermometry, and phase relations. / Morteani, G.; Bello, R. M.S.; Gandini, A. L. et al.
In: Schweizerische Mineralogische und Petrographische Mitteilungen, Vol. 82, No. 3, 2002, p. 455-466.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil)

T2 - Fluid inclusions, oxygen isotope thermometry, and phase relations

AU - Morteani, G.

AU - Bello, R. M.S.

AU - Gandini, A. L.

AU - Preinfalk, C.

PY - 2002

Y1 - 2002

N2 - The intense orange-yellow to cherry-red topaz found in quartz, hematite, dolomite, euclase veins in the area of Ouro Preto (Minas Gerais, Brazil) is known in trade as "Imperial Topaz". Only pink topaz from the Mardan District in Pakistan has similar gemmological properties and paragenesis. Fluid inclusion data, oxygen isotope geothermometry and considerations on the stability of kaolinite, pyrophyllite and carbonates found as inclusions in the Imperial Topaz from Ouro Preto indicate that topaz crystallized at about 360°C and 3.5 kbar. A high CO2 activity precluded flourination of the carbonates and stabilized topaz relative to fluorite. Flourine and beryllium, needed to form topaz and euclase, as well as CO2 were presumably provided by metamorphic fluids produced by the Brasiliano tectonothermal event at about 600 Ma.

AB - The intense orange-yellow to cherry-red topaz found in quartz, hematite, dolomite, euclase veins in the area of Ouro Preto (Minas Gerais, Brazil) is known in trade as "Imperial Topaz". Only pink topaz from the Mardan District in Pakistan has similar gemmological properties and paragenesis. Fluid inclusion data, oxygen isotope geothermometry and considerations on the stability of kaolinite, pyrophyllite and carbonates found as inclusions in the Imperial Topaz from Ouro Preto indicate that topaz crystallized at about 360°C and 3.5 kbar. A high CO2 activity precluded flourination of the carbonates and stabilized topaz relative to fluorite. Flourine and beryllium, needed to form topaz and euclase, as well as CO2 were presumably provided by metamorphic fluids produced by the Brasiliano tectonothermal event at about 600 Ma.

KW - Brazil

KW - Imperial topaz

KW - Metamorphism

KW - Microthermometry

KW - Oxygen isotope thermometry

UR - http://www.scopus.com/inward/record.url?scp=0036911622&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0036911622

SN - 0036-7699

VL - 82

SP - 455

EP - 466

JO - Schweizerische Mineralogische und Petrographische Mitteilungen

JF - Schweizerische Mineralogische und Petrographische Mitteilungen

IS - 3

ER -

P,T,X conditions of crystallization of Imperial Topaz from ouro Preto (Minas Gerais, Brazil): Fluid inclusions, oxygen isotope thermometry, and phase relations

Abstract

Keywords

Other files and links

Fingerprint

Cite this