Fibrous nepheline, pectolite and plagioclase from Baffin Island

D. D. Hogarth, H. Pósfai, P R Buseck, J. Smith

Research output: Contribution to journalArticle

Abstract

At Napoleon Bay, Baffin Island, fibrous aggregates define the contacts of Mesoproterozoic lamproite dykes with feldspathic wall-rock. The aggregates are composed of nepheline, pectolite and andesine, with fibre extensions along c, b and an indeterminate axis, respectively. Optically continuous, polymineralic fibre bundles are 0.1 to 0.2 mm long at the contact (all three minerals), 0.01 to 0.05 mm long in the wall-rock, but were not found beyond 8 mm from the dykes. Strongly alkaline, hydrothermal solutions, emanating from the dykes, reacted with labradorite in the wall-rock producing the fibrous agregates. Nepheline and pectolite were possibly derived from an unidentified, high-temperature phase that decomposed during cooling. Andesine may have been generated independently. Growth was directed across a set of tension fractures and proceeded with the aid of a thermal gradient as heat was removed continuously through the wall-rock.

Original languageEnglish (US)
Pages (from-to)51-56
Number of pages6
JournalEuropean Journal of Mineralogy
Volume13
Issue number1
DOIs
StatePublished - 2001
Externally publishedYes

Fingerprint

Wall rock
nepheline
wall rock
plagioclase
lamproite
labradorite
Fibers
Thermal gradients
Minerals
Cooling
cooling
mineral
Temperature
fibre

Keywords

  • Andesine
  • Baffin Island
  • Fibrous aggregates
  • Labradorite
  • Lamproite
  • Mesoproterozoic
  • Nepheline
  • Pectolite

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Fibrous nepheline, pectolite and plagioclase from Baffin Island. / Hogarth, D. D.; Pósfai, H.; Buseck, P R; Smith, J.

In: European Journal of Mineralogy, Vol. 13, No. 1, 2001, p. 51-56.

Research output: Contribution to journalArticle

Hogarth, D. D. ; Pósfai, H. ; Buseck, P R ; Smith, J. / Fibrous nepheline, pectolite and plagioclase from Baffin Island. In: European Journal of Mineralogy. 2001 ; Vol. 13, No. 1. pp. 51-56.
@article{5749dd2a915b4e49b3340fe60e036783,
title = "Fibrous nepheline, pectolite and plagioclase from Baffin Island",
abstract = "At Napoleon Bay, Baffin Island, fibrous aggregates define the contacts of Mesoproterozoic lamproite dykes with feldspathic wall-rock. The aggregates are composed of nepheline, pectolite and andesine, with fibre extensions along c, b and an indeterminate axis, respectively. Optically continuous, polymineralic fibre bundles are 0.1 to 0.2 mm long at the contact (all three minerals), 0.01 to 0.05 mm long in the wall-rock, but were not found beyond 8 mm from the dykes. Strongly alkaline, hydrothermal solutions, emanating from the dykes, reacted with labradorite in the wall-rock producing the fibrous agregates. Nepheline and pectolite were possibly derived from an unidentified, high-temperature phase that decomposed during cooling. Andesine may have been generated independently. Growth was directed across a set of tension fractures and proceeded with the aid of a thermal gradient as heat was removed continuously through the wall-rock.",
keywords = "Andesine, Baffin Island, Fibrous aggregates, Labradorite, Lamproite, Mesoproterozoic, Nepheline, Pectolite",
author = "Hogarth, {D. D.} and H. P{\'o}sfai and Buseck, {P R} and J. Smith",
year = "2001",
doi = "10.1127/0935-1221/01/0013-0051",
language = "English (US)",
volume = "13",
pages = "51--56",
journal = "European Journal of Mineralogy",
issn = "0935-1221",
publisher = "E. Schweizerbart'sche Verlagsbuchhandlung",
number = "1",

}

TY - JOUR

T1 - Fibrous nepheline, pectolite and plagioclase from Baffin Island

AU - Hogarth, D. D.

AU - Pósfai, H.

AU - Buseck, P R

AU - Smith, J.

PY - 2001

Y1 - 2001

N2 - At Napoleon Bay, Baffin Island, fibrous aggregates define the contacts of Mesoproterozoic lamproite dykes with feldspathic wall-rock. The aggregates are composed of nepheline, pectolite and andesine, with fibre extensions along c, b and an indeterminate axis, respectively. Optically continuous, polymineralic fibre bundles are 0.1 to 0.2 mm long at the contact (all three minerals), 0.01 to 0.05 mm long in the wall-rock, but were not found beyond 8 mm from the dykes. Strongly alkaline, hydrothermal solutions, emanating from the dykes, reacted with labradorite in the wall-rock producing the fibrous agregates. Nepheline and pectolite were possibly derived from an unidentified, high-temperature phase that decomposed during cooling. Andesine may have been generated independently. Growth was directed across a set of tension fractures and proceeded with the aid of a thermal gradient as heat was removed continuously through the wall-rock.

AB - At Napoleon Bay, Baffin Island, fibrous aggregates define the contacts of Mesoproterozoic lamproite dykes with feldspathic wall-rock. The aggregates are composed of nepheline, pectolite and andesine, with fibre extensions along c, b and an indeterminate axis, respectively. Optically continuous, polymineralic fibre bundles are 0.1 to 0.2 mm long at the contact (all three minerals), 0.01 to 0.05 mm long in the wall-rock, but were not found beyond 8 mm from the dykes. Strongly alkaline, hydrothermal solutions, emanating from the dykes, reacted with labradorite in the wall-rock producing the fibrous agregates. Nepheline and pectolite were possibly derived from an unidentified, high-temperature phase that decomposed during cooling. Andesine may have been generated independently. Growth was directed across a set of tension fractures and proceeded with the aid of a thermal gradient as heat was removed continuously through the wall-rock.

KW - Andesine

KW - Baffin Island

KW - Fibrous aggregates

KW - Labradorite

KW - Lamproite

KW - Mesoproterozoic

KW - Nepheline

KW - Pectolite

UR - http://www.scopus.com/inward/record.url?scp=0034809066&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034809066&partnerID=8YFLogxK

U2 - 10.1127/0935-1221/01/0013-0051

DO - 10.1127/0935-1221/01/0013-0051

M3 - Article

AN - SCOPUS:0034809066

VL - 13

SP - 51

EP - 56

JO - European Journal of Mineralogy

JF - European Journal of Mineralogy

SN - 0935-1221

IS - 1

ER -