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| Campo DC | Valor | Lengua/Idioma |
|---|---|---|
| dc.provenance | Comisión de Investigaciones Científicas | - |
| dc.contributor | Zalba, Patricia Eugenia | - |
| dc.contributor | Manassero, Marcelo | - |
| dc.contributor | Morosi, Martín Eduardo | - |
| dc.contributor | Conconi, María Susana | - |
| dc.creator | Zalba, Patricia Eugenia | - |
| dc.creator | Manassero, Marcelo | - |
| dc.creator | Morosi, Martín Eduardo | - |
| dc.creator | Conconi, María Susana | - |
| dc.date | 2010-06-22 | - |
| dc.date.accessioned | 2019-04-29T16:00:40Z | - |
| dc.date.available | 2019-04-29T16:00:40Z | - |
| dc.date.issued | 2010-06-22 | - |
| dc.identifier | http://digital.cic.gba.gob.ar/handle/11746/4228 | - |
| dc.identifier.uri | http://rodna.bn.gov.ar:8080/jspui/handle/bnmm/306842 | - |
| dc.description | At the At Estancia La Siempre Verde, La Placeres and Don Camilo quarries, Sierra La Juanita, near Barker locality, in the most ancient Neoproterozoic unit of the Tandilia System, the Villa Mónica Formation, carbonate (C) facies are identified and studied for the first time, while classically defined for more than 40 years as siliciclastic facies are redescribed as mixed facies: carbonate/siliciclastic (C/S) and heterolithic (H), both bearing biosignatures. The carbonates are represented by well-preserved columnar head stromatolite boundstones and by hematized microbial mat deposits which have been dolomitized, illitized and silicified, and bear `<em>in situ</em>´ grown individual or random aggregates of pyramidal quartz megacrystals, being their host rock also identified for the first time. The siliciclastic are composed of quartz grains trapped within both the stromatolites and the microbial mats, of illitic siltstones and claystones, and of quartzitic sandstones. Field work and microtextural studies revealed a complex history of weathering and diagenesis which, nevertheless, could not completely erase biosignatures and permitted the recognition of biogenerated rocks. Illuviation processes transported cutans to lower horizons. Syndiagenesis involved dolomitization, silicification and illitization, while burial diagenesis, produced pressure-solution effects by overburden, among others. Compressive movements from the SW were responsible for basin inversion: telodiagenesis (uplift, fracturing, folding, and introduction of meteoric fluids), affecting the Villa Mónica Formation with neoformation/transformation of minerals: kaolinite, halloysite and smectite, development of slickensides (stress cutans) and ferriargillans, hydration, dedolomitization and calcification. A paragenetic sequence is proposed. | - |
| dc.format | application/pdf | - |
| dc.format | 17 p. | - |
| dc.language | eng | - |
| dc.rights | info:eu-repo/semantics/openAccess | - |
| dc.rights | Attribution 4.0 International (BY 4.0) | - |
| dc.source | reponame:CIC Digital (CICBA) | - |
| dc.source | instname:Comisión de Investigaciones Científicas de la Provincia de Buenos Aires | - |
| dc.source | instacron:CICBA | - |
| dc.source.uri | http://digital.cic.gba.gob.ar/handle/11746/4228 | - |
| dc.subject | Mineralogía | - |
| dc.title | Preservation of Biogenerated Mixed Facies: A Case Study from the Neoproterozoic Villa Monica Formation, Sierra de la Juanita, Tandilia, Argentina | - |
| dc.type | info:eu-repo/semantics/article | - |
| dc.type | info:eu-repo/semantics/submittedVersion | - |
| dc.type | info:ar-repo/semantics/articulo | - |
| Aparece en las colecciones: | Comisión de Investigaciones Científicas de la Prov. de Buenos Aires | |
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