Developments in oxidation of the (Mg,Fe)SiO3 pyroxene series and use of thermogravimetry as a quantitative analytical method

Angeletos, S

dc.contributor.author	Angeletos, S	en
dc.date.accessioned	2014-03-01T01:05:32Z
dc.date.available	2014-03-01T01:05:32Z
dc.date.issued	1975	en
dc.identifier.issn	0009-2541	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/8871
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-49549140830&partnerID=40&md5=5276b5a92962d1e22bab45236712f971	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.title	Developments in oxidation of the (Mg,Fe)SiO3 pyroxene series and use of thermogravimetry as a quantitative analytical method	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1975	en
heal.abstract	Interest in the pyroxenes has increased since the realization that their alteration products could carry a stable remnant magnetization which is possibly related to the earth's magnetic field and would therefore be of great geophysical importance. In the present work, the oxidation of artificial samples of the (Mg,Fe)SiO3 pyroxene series was studied thermogravimetrically at the constant oxygen pressure of air and temperatures up to 1350°C. The resulting alteration products were determined after complete oxidation by a specific technique which is here reported as a new quantitative analytical method. This method could be applied to many other silicate groups, provided that iron is the only transitional element. Using natural samples, the accurate measure of the ratio Fe3+ Fe2+ provides a basis for a possible quantitative magnetic analytical method and for a geothermometer. Factors affecting the results, i.e., (a) the volatiles and (b) the contamination of transitional elements other than iron, were recognized but could be eliminated by using specific techniques. A large region of metastable solid solution of hematite (Fe2O3) in the spinel phase was found. The resulting oxides, after complete oxidation and precipitation of the Fe2O3 phase from the metastable spinel phase, were studied by thermogravimetric analysis and X-ray diffraction. © 1915.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Chemical Geology	en
dc.identifier.isi	ISI:A1975AE06100005	en
dc.identifier.volume	15	en
dc.identifier.issue	2	en
dc.identifier.spage	145	en
dc.identifier.epage	153	en