CATION SUBSTITUTIONS GOVERNING THE CHEMISTRY OF AMPHIBOLE IN THE SILGARÁ FORMATION METABASITES AT THE SOUTHWESTERN SANTANDER MASSIF
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Industrial de Santander
2005
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| _version_ | 1876445594912817152 |
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| author | C.A. Ríos |
| author_facet | C.A. Ríos |
| contents | CATION SUBSTITUTIONS GOVERNING THE CHEMISTRY OF AMPHIBOLE IN THE SILGARÁ FORMATION METABASITES AT THE SOUTHWESTERN SANTANDER MASSIF C.A. Ríos Geología Silgará amphibole metabasites substitution metamorphic conditions Amphibole-bearing parageneses from the Silgará Formation metabasites at the southwestern Santander Massif record evidence of prograding metamorphism. Optical and microprobe analyses, together with thermobarometric estimates on these rocks, show that the main variation in Ca-amphibole is the simultaneous substitution of Al into the T1 site (Al IV ) and Na+K into the A-site of the amphibole’s crystal structure. Al IV is strongly temperature dependant, and this dependancy masks any pressure effect. Changes in the chemical composition of Ca-amphibole grains are interpreted through coupled substitutions, and reactions with co-existing minerals during an increase in metamorphic conditions from greenschist to lower amphibolite facies, being favourable circumstances record not only the metamorphic facies reached by rocks but also the P-T conditions by which these were attained. 2005 artículo científico 0120-0283 https://www.redalyc.org/articulo.oa?id=349631990001 en http://www.redalyc.org/revista.oa?id=3496 Boletín de Geología application/pdf Universidad Industrial de Santander Boletín de Geología (Colombia) Num.2 Vol.27 |
| format | Artículo científico |
| id | redalyc_349631990001 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universidad Industrial de Santander |
| spellingShingle | CATION SUBSTITUTIONS GOVERNING THE CHEMISTRY OF AMPHIBOLE IN THE SILGARÁ FORMATION METABASITES AT THE SOUTHWESTERN SANTANDER MASSIF C.A. Ríos Geología Silgará amphibole metabasites substitution metamorphic conditions CATION SUBSTITUTIONS GOVERNING THE CHEMISTRY OF AMPHIBOLE IN THE SILGARÁ FORMATION METABASITES AT THE SOUTHWESTERN SANTANDER MASSIF C.A. Ríos Geología Silgará amphibole metabasites substitution metamorphic conditions Amphibole-bearing parageneses from the Silgará Formation metabasites at the southwestern Santander Massif record evidence of prograding metamorphism. Optical and microprobe analyses, together with thermobarometric estimates on these rocks, show that the main variation in Ca-amphibole is the simultaneous substitution of Al into the T1 site (Al IV ) and Na+K into the A-site of the amphibole’s crystal structure. Al IV is strongly temperature dependant, and this dependancy masks any pressure effect. Changes in the chemical composition of Ca-amphibole grains are interpreted through coupled substitutions, and reactions with co-existing minerals during an increase in metamorphic conditions from greenschist to lower amphibolite facies, being favourable circumstances record not only the metamorphic facies reached by rocks but also the P-T conditions by which these were attained. 2005 artículo científico 0120-0283 https://www.redalyc.org/articulo.oa?id=349631990001 en http://www.redalyc.org/revista.oa?id=3496 Boletín de Geología application/pdf Universidad Industrial de Santander Boletín de Geología (Colombia) Num.2 Vol.27 |
| title | CATION SUBSTITUTIONS GOVERNING THE CHEMISTRY OF AMPHIBOLE IN THE SILGARÁ FORMATION METABASITES AT THE SOUTHWESTERN SANTANDER MASSIF |
| topic | Geología Silgará amphibole metabasites substitution metamorphic conditions |
| url | https://www.redalyc.org/articulo.oa?id=349631990001 |