Itqiy: A metal-rich enstatite meteorite with achondritic texture

A. Patzer, D. H. Hill, William V. Boynton

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Itqiy is a unique coarse-grained, metal-rich enstatite meteorite that was found in the Western Sahara and consists of two rocks together weighing 4.72 kg, which are both completely coated with fusion crust. We report results from our electron microprobe and instrumental neutron activation analysis techniques. Itqiy consists of subhedral, equigranular, millimeter-sized enstatite, ∼25 vol% of millimeter-sized kamacite and a few tiny intergrowths of sulfides and kamacite. Relic chondrules are absent. Pyroxene (Fs0.2) is chemically similar to enstatite in EL chondrites, but the metal is closer in composition to that in EH chondrites. Sulfides resemble those in E chondrites but their compositions are distinct from those in both EL and EH chondrites. Itqiy clearly formed under very reducing conditions, but it does not appear to have formed from EH or EL chondrites. Two thermal events can be distinguished. Silicate compositions including rare earth element abundances indicate loss of partial melt and slow cooling. Heterogeneous sulfides indicate a subsequent reheating and quenching event, which may have been due to shock as many enstatite grains show shock stage S3 features.

Original languageEnglish (US)
Pages (from-to)1495-1505
Number of pages11
JournalMeteoritics and Planetary Science
Volume36
Issue number11
StatePublished - 2001

Fingerprint

enstatite
chondrites
meteorites
chondrite
meteorite
textures
texture
kamacite
metal
sulfides
metals
sulfide
shock
chondrule
neutron activation analysis
electron probe analysis
pyroxene
silicates
crusts
rare earth element

ASJC Scopus subject areas

  • Geophysics

Cite this

Itqiy : A metal-rich enstatite meteorite with achondritic texture. / Patzer, A.; Hill, D. H.; Boynton, William V.

In: Meteoritics and Planetary Science, Vol. 36, No. 11, 2001, p. 1495-1505.

Research output: Contribution to journalArticle

@article{00f65cadba3941a09d49f73b4b27777e,
title = "Itqiy: A metal-rich enstatite meteorite with achondritic texture",
abstract = "Itqiy is a unique coarse-grained, metal-rich enstatite meteorite that was found in the Western Sahara and consists of two rocks together weighing 4.72 kg, which are both completely coated with fusion crust. We report results from our electron microprobe and instrumental neutron activation analysis techniques. Itqiy consists of subhedral, equigranular, millimeter-sized enstatite, ∼25 vol{\%} of millimeter-sized kamacite and a few tiny intergrowths of sulfides and kamacite. Relic chondrules are absent. Pyroxene (Fs0.2) is chemically similar to enstatite in EL chondrites, but the metal is closer in composition to that in EH chondrites. Sulfides resemble those in E chondrites but their compositions are distinct from those in both EL and EH chondrites. Itqiy clearly formed under very reducing conditions, but it does not appear to have formed from EH or EL chondrites. Two thermal events can be distinguished. Silicate compositions including rare earth element abundances indicate loss of partial melt and slow cooling. Heterogeneous sulfides indicate a subsequent reheating and quenching event, which may have been due to shock as many enstatite grains show shock stage S3 features.",
author = "A. Patzer and Hill, {D. H.} and Boynton, {William V.}",
year = "2001",
language = "English (US)",
volume = "36",
pages = "1495--1505",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "The University of Arkansas Press",
number = "11",

}

TY - JOUR

T1 - Itqiy

T2 - A metal-rich enstatite meteorite with achondritic texture

AU - Patzer, A.

AU - Hill, D. H.

AU - Boynton, William V.

PY - 2001

Y1 - 2001

N2 - Itqiy is a unique coarse-grained, metal-rich enstatite meteorite that was found in the Western Sahara and consists of two rocks together weighing 4.72 kg, which are both completely coated with fusion crust. We report results from our electron microprobe and instrumental neutron activation analysis techniques. Itqiy consists of subhedral, equigranular, millimeter-sized enstatite, ∼25 vol% of millimeter-sized kamacite and a few tiny intergrowths of sulfides and kamacite. Relic chondrules are absent. Pyroxene (Fs0.2) is chemically similar to enstatite in EL chondrites, but the metal is closer in composition to that in EH chondrites. Sulfides resemble those in E chondrites but their compositions are distinct from those in both EL and EH chondrites. Itqiy clearly formed under very reducing conditions, but it does not appear to have formed from EH or EL chondrites. Two thermal events can be distinguished. Silicate compositions including rare earth element abundances indicate loss of partial melt and slow cooling. Heterogeneous sulfides indicate a subsequent reheating and quenching event, which may have been due to shock as many enstatite grains show shock stage S3 features.

AB - Itqiy is a unique coarse-grained, metal-rich enstatite meteorite that was found in the Western Sahara and consists of two rocks together weighing 4.72 kg, which are both completely coated with fusion crust. We report results from our electron microprobe and instrumental neutron activation analysis techniques. Itqiy consists of subhedral, equigranular, millimeter-sized enstatite, ∼25 vol% of millimeter-sized kamacite and a few tiny intergrowths of sulfides and kamacite. Relic chondrules are absent. Pyroxene (Fs0.2) is chemically similar to enstatite in EL chondrites, but the metal is closer in composition to that in EH chondrites. Sulfides resemble those in E chondrites but their compositions are distinct from those in both EL and EH chondrites. Itqiy clearly formed under very reducing conditions, but it does not appear to have formed from EH or EL chondrites. Two thermal events can be distinguished. Silicate compositions including rare earth element abundances indicate loss of partial melt and slow cooling. Heterogeneous sulfides indicate a subsequent reheating and quenching event, which may have been due to shock as many enstatite grains show shock stage S3 features.

UR - http://www.scopus.com/inward/record.url?scp=0035203217&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035203217&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0035203217

VL - 36

SP - 1495

EP - 1505

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

SN - 1086-9379

IS - 11

ER -