Granitoids of the Coast Range of central Chile: Geochronology and geologic setting

Hervé, Francisco; Munizaga, Francisco; Parada, Miguel A.; Brook, M.; Pankhurst, R. J.; Snelling, N. J.; Drake, Robert E.

doi:10.1016/0895-9811(88)90036-3

Cited by 80 publications

(50 citation statements)

References 5 publications

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“…The Coastal Batholith intrusives 30 km north of the Quintay study area at Reñaca, yielded a Rb-Sr isochron age of 299±31 Ma (Hervé et al, 1988). At Valparaíso, 10 km to the south of Reñaca, a Rb-Sr isochron age of 296±5 Ma (Shibata et al, 1984) was obtained.…”

Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 96%

“…At Valparaíso, 10 km to the south of Reñaca, a Rb-Sr isochron age of 296±5 Ma (Shibata et al, 1984) was obtained. South of Quintay, at Algarrobo, an age of 292±2 Ma and at Santo Domingo an age of 308±15 Ma was published by Hervé et al (1988). Both represent ages of the northern part or the out-cropping Coastal Batholith.…”

Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 99%

“…The Coastal Batholith is composed of calc-alkaline granitoid suites developed during late Paleozoic time, mainly between late Carboniferous and Early Permian (e.g., Cordani et al, 1976;Hervé, 1976;Hervé et al, 1988;Parada et al, 1991;Martin et al, 1999a;Ramírez, 2010). Also present in the Coastal Cordillera are gabbros and fayalite-bearing granites of Triassic age and classified as an anorogenic Atype granitoid suite (Vásquez and Franz, 2008) and some late to middle Jurassic two-pyroxene diorites, gabbros and hornblende-biotite tonalites (Godoy and Loske, 1988;Parada et al, 1991;Hernández, 2006).…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…The Paleozoic sample yields an initial 87 Sr/ 86 Sr isotope ratio of 0.7132, the Jurassic sample is less radiogenic with an initial ratio of 0.7038. Two more Paleozoic K-Ar ages are presented in Hervé et al (1988) for Algarrobo intrusives on biotite and hornblende yielding 287±7 Ma and 296±7 Ma, respectively. At Quintay and Reñaca, two further Jurassic ages on biotite are published (Hervé et al, 1988), at 159±4 Ma and 156±1 Ma, respectively.…”

Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 99%

“…Critically important indicators of subduction are the late Paleozoic accretionary complex and the calc-alkaline Coastal Batholith. Although their origin within a subduction setting as exemplified for the Neogene Chilean active margin (e.g., Barazangi and Isacks, 1976;Hager and O'Connell, 1978;Jordan et al, 1983;Cahill and Isacks, 1992) seems straightforward (Hervé et al, 1988;Hervé et al, 2007a;Parada et al, 2007), the exact timing, nature and geodynamic significance of the Coastal Batholith in south-central Chile warrants further detailed investigations.…”

Section: Introductionmentioning

confidence: 99%

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Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile.

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ABSTRACT. The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed of calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over a distance of 800 km yielded ages between 300 and 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses on the same zircon grains have initial εHf (i) values from +1.67 to -5.64. The δ 18 O ratios for that grains range from 6.4 to 8.6‰. These new isotopic data point to a relative homogeneous source with prominent components of the continental crust. The calculated Mesoproterozoic Depleted Mantel model ages, in addition to the short span of intrusive ages give insights to the position of the proto-Gondwana margin and the changing subduction mechanism at the end of late Paleozoic time.

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Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 96%

Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Previous Age and Isotopic Data Of The Late Paleozoic Coastalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cenozoic Orogenic Evolution of the Southern Central Andes (32–36°S)

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Granitoids of the Coast Range of central Chile: Geochronology and geologic setting

Cited by 80 publications

References 5 publications

Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile.

Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile.

The Role of Landslide Research in the Quaternary Evolution of the Central Andes (31°–34 °S)

Cenozoic Orogenic Evolution of the Southern Central Andes (32–36°S)

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