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Title: Chemical and petrological study of igneous lithic clasts from the Kapoeta howardite

Abstract

Instrumental and radiochemical neutron activation analyses supported by electron microprobe mineral analyses and petrographic observations are presented for approximately forty individual clasts separated from the Kapoeta howardite. These clasts are classified into eucritic, cumulate-like, mafic (plagioclase +- olivine-bearing pyroxenites), pyroxenite, polymict and/or metal-rich and chondritic components. Geochemical inferences are presented which suggest significant compositional variations in the eucritic clasts as compared to normal main group eucrites. Conclusions are presented which attempt to account for the compositional variations observed in normal eucrites, diogenites, pallasites and the howardite lithic clasts observed in this work. The evolutionary sequence includes: (1) initial production of extensive core melts leaving pallasitic-like residuals; (2) generation of near surface low-degree partial melts (Mg-rich eucritic clasts); (3) crystallization of extruded primary melts (diogenites and cumulate eucrites); and (4) cumulate remelting (normal eucrites) episodes. This sequence of igneous events requires that the KPB was heated by a melt-mobile heat source such as primordial /sup 26/Al.

Authors:
Publication Date:
Research Org.:
Oregon State Univ., Corvallis (USA)
OSTI Identifier:
5948702
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; IGNEOUS ROCKS; ACTIVATION ANALYSIS; PETROLOGY; CHEMICAL COMPOSITION; NEUTRON REACTIONS; BARYON REACTIONS; CHEMICAL ANALYSIS; GEOLOGY; HADRON REACTIONS; NUCLEAR REACTIONS; NUCLEON REACTIONS; ROCKS; 580100* - Geology & Hydrology- (-1989); 400101 - Activation, Nuclear Reaction, Radiometric & Radiochemical Procedures

Citation Formats

Smith, M R. Chemical and petrological study of igneous lithic clasts from the Kapoeta howardite. United States: N. p., 1983. Web.
Smith, M R. Chemical and petrological study of igneous lithic clasts from the Kapoeta howardite. United States.
Smith, M R. 1983. "Chemical and petrological study of igneous lithic clasts from the Kapoeta howardite". United States.
@article{osti_5948702,
title = {Chemical and petrological study of igneous lithic clasts from the Kapoeta howardite},
author = {Smith, M R},
abstractNote = {Instrumental and radiochemical neutron activation analyses supported by electron microprobe mineral analyses and petrographic observations are presented for approximately forty individual clasts separated from the Kapoeta howardite. These clasts are classified into eucritic, cumulate-like, mafic (plagioclase +- olivine-bearing pyroxenites), pyroxenite, polymict and/or metal-rich and chondritic components. Geochemical inferences are presented which suggest significant compositional variations in the eucritic clasts as compared to normal main group eucrites. Conclusions are presented which attempt to account for the compositional variations observed in normal eucrites, diogenites, pallasites and the howardite lithic clasts observed in this work. The evolutionary sequence includes: (1) initial production of extensive core melts leaving pallasitic-like residuals; (2) generation of near surface low-degree partial melts (Mg-rich eucritic clasts); (3) crystallization of extruded primary melts (diogenites and cumulate eucrites); and (4) cumulate remelting (normal eucrites) episodes. This sequence of igneous events requires that the KPB was heated by a melt-mobile heat source such as primordial /sup 26/Al.},
doi = {},
url = {https://www.osti.gov/biblio/5948702}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}

Thesis/Dissertation:
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