Weathering processes and pickeringite formation in a sulfidic schist

A consideration in acid precipitation neutralization studies

Research output: Contribution to journalArticle

Abstract

Extremely low abrasion pH values characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurence is observed of two sulfates that are rare in the northeastrn U. S. : pickeringite and jarosite. X-ray diffraction studies of the weathering residues and the sulfate efflorescences have also identified dioctahedral and trioctahedral illite, kaolinite, vermiculite, and an 11-12 A phase, thought to be a type of randomly-interstratified biotite-vermiculite. From the mineralogical studies, qualitative weathering processes for the schist are formulated. A probable mechanism for the intense chemical weathering of the schist appears to be oxidation of iron sulfides to form iron oxide-hydroxides, sulfates, and sulfuric acid. This natural weathering process is proposed as an analog to anthropogenic low pH rock weathering resulting from acid precipitation. Refs.

Original languageEnglish (US)
Pages (from-to)209-215
Number of pages7
JournalEnvironmental geology New York
Volume4
Issue number3-4
StatePublished - 1983
Externally publishedYes

Fingerprint

metamorphic rocks
acid precipitation
acid deposition
neutralization
Weathering
weathering
schist
Sulfates
Acids
Hydroxides
vermiculite
Kaolin
sulfates
sulfate
Sulfides
X-Ray Diffraction
Iron
Efflorescence
jarosite
iron sulfide

ASJC Scopus subject areas

  • Engineering(all)
  • Medicine(all)
  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

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title = "Weathering processes and pickeringite formation in a sulfidic schist: A consideration in acid precipitation neutralization studies",
abstract = "Extremely low abrasion pH values characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurence is observed of two sulfates that are rare in the northeastrn U. S. : pickeringite and jarosite. X-ray diffraction studies of the weathering residues and the sulfate efflorescences have also identified dioctahedral and trioctahedral illite, kaolinite, vermiculite, and an 11-12 A phase, thought to be a type of randomly-interstratified biotite-vermiculite. From the mineralogical studies, qualitative weathering processes for the schist are formulated. A probable mechanism for the intense chemical weathering of the schist appears to be oxidation of iron sulfides to form iron oxide-hydroxides, sulfates, and sulfuric acid. This natural weathering process is proposed as an analog to anthropogenic low pH rock weathering resulting from acid precipitation. Refs.",
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AU - Parnell, Roderic A

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N2 - Extremely low abrasion pH values characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurence is observed of two sulfates that are rare in the northeastrn U. S. : pickeringite and jarosite. X-ray diffraction studies of the weathering residues and the sulfate efflorescences have also identified dioctahedral and trioctahedral illite, kaolinite, vermiculite, and an 11-12 A phase, thought to be a type of randomly-interstratified biotite-vermiculite. From the mineralogical studies, qualitative weathering processes for the schist are formulated. A probable mechanism for the intense chemical weathering of the schist appears to be oxidation of iron sulfides to form iron oxide-hydroxides, sulfates, and sulfuric acid. This natural weathering process is proposed as an analog to anthropogenic low pH rock weathering resulting from acid precipitation. Refs.

AB - Extremely low abrasion pH values characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurence is observed of two sulfates that are rare in the northeastrn U. S. : pickeringite and jarosite. X-ray diffraction studies of the weathering residues and the sulfate efflorescences have also identified dioctahedral and trioctahedral illite, kaolinite, vermiculite, and an 11-12 A phase, thought to be a type of randomly-interstratified biotite-vermiculite. From the mineralogical studies, qualitative weathering processes for the schist are formulated. A probable mechanism for the intense chemical weathering of the schist appears to be oxidation of iron sulfides to form iron oxide-hydroxides, sulfates, and sulfuric acid. This natural weathering process is proposed as an analog to anthropogenic low pH rock weathering resulting from acid precipitation. Refs.

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