Zalba, Patricia Eugenia, Conconi, María Susana, Morosi, Martín, Manassero, Marcelo, Comerio, Marcos (2011) Dawsonite in Tuffs and Litharenites of the Cerro Castano Member, Cerro Barcino Formation, Chubut group (Cenomanian), Los Altares, Patagonia, Argentina. The Canadian Mineralogist, 49 (2) 503-520 doi:10.3749/canmin.49.2.503
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Dawsonite in Tuffs and Litharenites of the Cerro Castano Member, Cerro Barcino Formation, Chubut group (Cenomanian), Los Altares, Patagonia, Argentina | ||
| Journal | The Canadian Mineralogist | ||
| Authors | Zalba, Patricia Eugenia | Author | |
| Conconi, María Susana | Author | ||
| Morosi, Martín | Author | ||
| Manassero, Marcelo | Author | ||
| Comerio, Marcos | Author | ||
| Year | 2011 (April 1) | Volume | 49 |
| Page(s) | 503-520 | Issue | 2 |
| Publisher | Mineralogical Association of Canada | ||
| DOI | doi:10.3749/canmin.49.2.503Search in ResearchGate | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 64873 | Long-form Identifier | mindat:1:5:64873:4 |
| GUID | ba7970a4-7eaa-4d99-971d-838b0af5a7b2 | ||
| Full Reference | Zalba, Patricia Eugenia, Conconi, María Susana, Morosi, Martín, Manassero, Marcelo, Comerio, Marcos (2011) Dawsonite in Tuffs and Litharenites of the Cerro Castano Member, Cerro Barcino Formation, Chubut group (Cenomanian), Los Altares, Patagonia, Argentina. The Canadian Mineralogist, 49 (2) 503-520 doi:10.3749/canmin.49.2.503 | ||
| Plain Text | Zalba, Patricia Eugenia, Conconi, María Susana, Morosi, Martín, Manassero, Marcelo, Comerio, Marcos (2011) Dawsonite in Tuffs and Litharenites of the Cerro Castano Member, Cerro Barcino Formation, Chubut group (Cenomanian), Los Altares, Patagonia, Argentina. The Canadian Mineralogist, 49 (2) 503-520 doi:10.3749/canmin.49.2.503 | ||
| In | (2011, April) The Canadian Mineralogist Vol. 49 (2) Mineralogical Association of Canada | ||
| Abstract/Notes | Dawsonite, NaAlCO3(OH)2, occurs as a replacement, cement, and fracture filling in continental, zeolitized and silicified vitric tuffs and litharenites of the Cenomanian Cerro Castaño Member, Cerro Barcino Formation, Chubut Group, Patagonia, Argentina. Analcime is the only associated zeolite; it replaces the vitric masses and also fills fractures and cavities. Dawsonite and analcime display an inverse ratio. Textural relationships indicate that dawsonite is a pseudomorph after oligoclase, quartz, vitric shards, and vitric masses; it coexists with diagenetic quartz cement and postdates analcime, calcite, and hematite cements. Unaltered crystals of high sanidine postdate all other cements generated. Silicification of the tuffs is likely to have occurred in various stages during the diagenetic history of the sequence. Hypabyssal bodies of alkaline basic rocks of the El Buitre – El Canquel Formation, which intruded regionally the Cerro Castaño Member during Eocene time, are interpreted to be responsible for the introduction of CO2 gas at high partial pressures, together with sodium, which led to dawsonite formation. Diagenetic quartz, at a late stage of silicification, is related to the transformation of oligoclase and analcime to dawsonite, also releasing Na and Ca into the system. The d13C (PDB) values of dawsonite, in the range –1.2 to –2.4‰, attest to alkaline igneous activity in the Cerro Castaño Member during the Eocene and, in addition, set a limit on the age of the dawsonite. | ||
Map of Localities
Locality Pages
| Locality | Citation Details |
|---|---|
| Dawsonite locality, Los Altares, Paso de Indios Department, Chubut Province, Argentina |
Mineral Occurrences
See Also
These are possibly similar items as determined by title/reference text matching only.
