A sulfur isotope study of pyrite genesis: The Mid-Proterozoic Newland Formation, Belt Supergroup, Montana
Journal Article
·
· Geochimica et Cosmochimica Acta; (USA)
- Institut fur Geologie, Bochum (Germany, F.R.)
- Univ. of Texas, Arlington (USA)
Different generations of sedimentary pyrite from the Mid-Proterozoic Newland Formation, USA, have been analysed for their sulfur isotopic compositions. The results indicate bacterial sulfate reduction as the pyrite forming process. The {delta}{sup 34}S values for early diagenetic pyrite, around -14{per thousand}, are in contrast to dominantly more positive values for many other Middle Proterozoic units. A progressive reduction of sulfate availability during diagenesis can be recognized by an increase in {sup 34}S content (Rayleigh Distillation) as well as through detailed petrographic observations. Contemporaneous seawater had a sulfur isotopic ratio between +14 and +18% as measured from sedimentary barite within the unit.
- OSTI ID:
- 6702093
- Journal Information:
- Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 54:1; ISSN GCACA; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
Similar Records
Origin of sulfide and phosphate deposits in Upper Proterozoic carbonate strata, Irece basin, Bahia, Brazil
Sulfur and oxygen isotope systematics in the Coates Lake stratiform copper deposit (Redstone), N. W. T. , Canada
Relationship of depositional environment to microfabric features of a shale unit in the mid-Proterozoic Newland Formation, Montana
Conference
·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5676649
Sulfur and oxygen isotope systematics in the Coates Lake stratiform copper deposit (Redstone), N. W. T. , Canada
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6318160
Relationship of depositional environment to microfabric features of a shale unit in the mid-Proterozoic Newland Formation, Montana
Conference
·
Sun Jan 31 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5977137
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
BIOCONVERSION
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISTRY
DIAGENESIS
EVEN-EVEN NUCLEI
FEDERAL REGION VIII
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC FORMATIONS
IRON COMPOUNDS
IRON SULFIDES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MINERALIZATION
MINERALS
MONTANA
NORTH AMERICA
NUCLEI
PETROGRAPHY
PRECAMBRIAN ERA
PYRITE
REDUCTION
ROCKS
SEDIMENTARY ROCKS
STABLE ISOTOPES
SULFIDE MINERALS
SULFIDES
SULFUR 34
SULFUR COMPOUNDS
SULFUR ISOTOPES
TRANSITION ELEMENT COMPOUNDS
USA
580000* -- Geosciences
BIOCONVERSION
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISTRY
DIAGENESIS
EVEN-EVEN NUCLEI
FEDERAL REGION VIII
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC FORMATIONS
IRON COMPOUNDS
IRON SULFIDES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MINERALIZATION
MINERALS
MONTANA
NORTH AMERICA
NUCLEI
PETROGRAPHY
PRECAMBRIAN ERA
PYRITE
REDUCTION
ROCKS
SEDIMENTARY ROCKS
STABLE ISOTOPES
SULFIDE MINERALS
SULFIDES
SULFUR 34
SULFUR COMPOUNDS
SULFUR ISOTOPES
TRANSITION ELEMENT COMPOUNDS
USA