U-Pb Geochronology and Hf-O Isotopes of zircons from the Pennsylvanian Coastal Batholith, South-Central Chile
作者： Katja Deckart , Francisco Hervé , C. Mark Fanning , Valeria Ramírez , Mauricio Calderón
关键词: Geology 、 Continental crust 、 Batholith 、 Period (geology) 、 Pennsylvanian 、 Paleozoic 、 Carboniferous 、 Geochemistry 、 Zircon 、 Mineralogy 、 Geochronology
摘要: The Coastal Batholith of south-central Chile between latitudes 33° and 40°S is composed calc-alkaline granitoids emplaced in a relatively restricted time period. New SHRIMP U-Pb zircon ages on eight quartzdioritic to granitic rocks collected over distance 800 km yielded 300 320 Ma, Pennsylvanian (late Carboniferous). Lu-Hf isotopic analyses the same grains have initial eHf(i) values from +1.67 -5.64. δ18O ratios for that range 6.4 8.6‰. These new data point relative homogeneous source with prominent components continental crust. calculated Mesoproterozoic Depleted Mantel model ages, addition short span intrusive give insights position proto-Gondwana margin changing subduction mechanism at end late Paleozoic time.
uchile.cl
unirioja.es
unab.cl
sci-hub.st 参考文章(25)
Valeria Carolina, Ramírez Meneses, Plutonismo del Carbonífero Superior y Jurásico Medio en el Tramo Costero entre Laguna Verde y Tunquén (33° 05’ - 33° 15’ s), Chile Central Universidad de Chile. ,(2010)
Estanislao Godoy, Werner Loske, Tectonismo sinplutonico de dioritas jurasicas al sur de Valparaiso: datos U-Pb sobre la 'fase Quintay' Andean Geology. ,vol. 15, pp. 119- 127 ,(1988) , 10.5027/ANDGEOV15N2-A02
Silvana Evangelina Geuna, Carlos Oscar Limarino, Leonardo Darío Escosteguy, Paleomagnetism of the Carboniferous-Permian Patquía Formation, Paganzo basin, Argentina: implications for the apparent polar wander path for South America and Gondwana during the Late Palaeozoic Geologica Acta. ,vol. 8, pp. 373- 397 ,(2010) , 10.1344/105.000001578
Ulf Söderlund, P.Jonathan Patchett, Jeffrey D Vervoort, Clark E Isachsen, The 176Lu decay constant determined by Lu–Hf and U–Pb isotope systematics of Precambrian mafic intrusions Earth and Planetary Science Letters. ,vol. 219, pp. 311- 324 ,(2004) , 10.1016/S0012-821X(04)00012-3
T. V. GERYA, F. I. MEILICK, Geodynamic regimes of subduction under an active margin: effects of rheological weakening by fluids and melts Journal of Metamorphic Geology. ,vol. 29, pp. 7- 31 ,(2011) , 10.1111/J.1525-1314.2010.00904.X
Paulina Gana, Richard M. Tosdal, Geocronologia U-Pb y K-Ar en intrusivos del Paleozoico y Mesozoico de la Cordillera de la Costa, Region de Valparaiso, Chile Andean Geology. ,vol. 23, pp. 151- 164 ,(1996) , 10.5027/ANDGEOV23N2-A04
F. Hervé, M. Calderón, C.M. Fanning, R.J. Pankhurst, E. Godoy, Provenance variations in the Late Paleozoic accretionary complex of central Chile as indicated by detrital zircons Gondwana Research. ,vol. 23, pp. 1122- 1135 ,(2013) , 10.1016/J.GR.2012.06.016
Jeff D Vervoort, Janne Blichert-Toft, Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time Geochimica et Cosmochimica Acta. ,vol. 63, pp. 533- 556 ,(1999) , 10.1016/S0016-7037(98)00274-9
Fouad Tera, G.J. Wasserburg, U-Th-Pb systematics in three Apollo 14 basalts and the problem of initial Pb in lunar rocks Earth and Planetary Science Letters. ,vol. 14, pp. 281- 304 ,(1972) , 10.1016/0012-821X(72)90128-8
Thomas Cahill, Bryan L. Isacks, Seismicity and shape of the subducted Nazca Plate Journal of Geophysical Research. ,vol. 97, pp. 17503- 17529 ,(1992) , 10.1029/92JB00493