Loading...
Please wait, while we are loading the content...
Similar Documents
El magmatismo neopaleozoico en la Sierra de La Huerta, Sierras Pampeanas Occidentales, provincia de San Juan: los pórfidos Marayes Viejo y El Arriero
| Content Provider | Semantic Scholar |
|---|---|
| Author | Machuca, Brígida Castro De Conte-Grand, Alicia Meissl, Estela Pontoriero, Sandra Sumay, Celina Morata, Diego |
| Copyright Year | 2007 |
| Abstract | Neopaleozoic magmatism in the Sierra de La Huerta, Western Sierras Pampeanas, province of San Juan: the Marayes Viejo and El Arriero porphyries. Two subvolcanic porphyritic bodies assigned to the gondwanic magmatic cycle intrude the crystalline basement at El Arriero creek (El Arriero Dacite) and Marayes Viejo area (Marayes Viejo Andesite) in the Sierra de La Huerta, Western Sierras Pampeanas. They are medium to high-K calc-alkaline andesites to dacites. A 299.9 ± 3.6 Ma biotite Ar/Ar age was determined in the El Arriero Dacite meanwhile a 259 ± 13 Ma whole-rock K/Ar age was obtained for the Marayes Viejo Andesite. The age from the El Arriero Dacite represents the earliest manifestation of Neopaleozoic magmatism in the Western Sierras Pampeanas, San Juan province, and demons- trates that volcanic activity in the study area was continuous during the Upper Carboniferous to Late Triassic. The evidences presen- ted here indicate that the Marayes Viejo Andesite and the El Arriero Dacite constitute co-sanguineous rocks, having typical volcanic- arc geochemical signatures and rare earth elements patterns consistent with a subduction-related zone active during the Neopaleozoic. According to the petrology, age dating and whole-rock chemistry, these rocks can be correlated with similar outcrops from Punta del Agua Formation described in the Precordillera of La Rioja. |
| Starting Page | 447 |
| Ending Page | 459 |
| Page Count | 13 |
| File Format | PDF HTM / HTML |
| Volume Number | 62 |
| Alternate Webpage(s) | http://www.scielo.org.ar/pdf/raga/v62n3/v62n3a12.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
