CONODONT ALTERATION IN DEVONO-CARBONIFEROUS DOLOMITES FROM SOUTHERN BELGIUM

Authors
Citation
S. Helsen, CONODONT ALTERATION IN DEVONO-CARBONIFEROUS DOLOMITES FROM SOUTHERN BELGIUM, Geologie en mijnbouw, 74(3), 1995, pp. 225-234
Citations number
29
Categorie Soggetti
Geology,"Mining & Mineral Processing
Journal title
ISSN journal
00167746
Volume
74
Issue
3
Year of publication
1995
Pages
225 - 234
Database
ISI
SICI code
0016-7746(1995)74:3<225:CAIDDF>2.0.ZU;2-9
Abstract
Conodonts from selected Frasnian and Tournaisian dolomites in southern Belgium have Colour Alteration Index (CAI) values of 3.0-4.5 or 6.0-7 .0. The textural alteration of these conodonts includes various featur es. Most striking are the subhedral apatite crystals that surround the conodont denticles. Furthermore, fields of apatite crystals, irregula r apatite envelopes and apatite pseudomorphs after calcite occur on th e conodont surfaces. The higher CAIs as well as the textural alteratio n are probably related to dolomitization processes. Phosphates may hav e been supplied by decomposition of organic matter or by ascending sal ine fluids.