Weathering processes and pickeringite formation in a sulfidic schist

A consideration in acid precipitation neutralization studies

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Extremely low abrasion pH values (2.8-3.3) characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurrence is observed of two sulfates that are rare in the Northeast: 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 Å 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. In the Northeast, natural weathering rates, may, in places, significantly affect the water chemistry and mineralogy used to quantify total (natural plus anthropogenic) weathering and leaching rates.

Original languageEnglish (US)
Pages (from-to)209-215
Number of pages7
JournalEnvironmental Geology
Volume4
Issue number3-4
DOIs
StatePublished - 1982
Externally publishedYes

Fingerprint

metamorphic rocks
acid precipitation
acid deposition
neutralization
Weathering
weathering
schist
Acids
vermiculite
sulfate
Sulfates
sulfates
jarosite
weathering rate
Efflorescence
iron sulfide
black shale
Hydroxides
chemical weathering
abrasion

ASJC Scopus subject areas

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

Cite this

@article{cb24fc82b07045309b4f834ceff32030,
title = "Weathering processes and pickeringite formation in a sulfidic schist: A consideration in acid precipitation neutralization studies",
abstract = "Extremely low abrasion pH values (2.8-3.3) characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurrence is observed of two sulfates that are rare in the Northeast: 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 {\AA} 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. In the Northeast, natural weathering rates, may, in places, significantly affect the water chemistry and mineralogy used to quantify total (natural plus anthropogenic) weathering and leaching rates.",
author = "Parnell, {Roderic A}",
year = "1982",
doi = "10.1007/BF02380514",
language = "English (US)",
volume = "4",
pages = "209--215",
journal = "Environmental Earth Sciences",
issn = "1866-6280",
publisher = "Springer Verlag",
number = "3-4",

}

TY - JOUR

T1 - Weathering processes and pickeringite formation in a sulfidic schist

T2 - A consideration in acid precipitation neutralization studies

AU - Parnell, Roderic A

PY - 1982

Y1 - 1982

N2 - Extremely low abrasion pH values (2.8-3.3) characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurrence is observed of two sulfates that are rare in the Northeast: 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 Å 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. In the Northeast, natural weathering rates, may, in places, significantly affect the water chemistry and mineralogy used to quantify total (natural plus anthropogenic) weathering and leaching rates.

AB - Extremely low abrasion pH values (2.8-3.3) characterize the weathering products of the Partridge Formation, a Middle-Ordovician metamorphosed, black, sulfidic shale. The local occurrence is observed of two sulfates that are rare in the Northeast: 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 Å 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. In the Northeast, natural weathering rates, may, in places, significantly affect the water chemistry and mineralogy used to quantify total (natural plus anthropogenic) weathering and leaching rates.

UR - http://www.scopus.com/inward/record.url?scp=34250231911&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34250231911&partnerID=8YFLogxK

U2 - 10.1007/BF02380514

DO - 10.1007/BF02380514

M3 - Article

VL - 4

SP - 209

EP - 215

JO - Environmental Earth Sciences

JF - Environmental Earth Sciences

SN - 1866-6280

IS - 3-4

ER -