Matches in SemOpenAlex for { <https://semopenalex.org/work/W2521001873> ?p ?o ?g. }
- W2521001873 endingPage "440" @default.
- W2521001873 startingPage "422" @default.
- W2521001873 abstract "Few localities in the Patagonian Andes expose remnants of the Mesozoic Chilean paleo-accretionary complex. We focus on the Diego de Almagro Island high-pressure/low-temperature (HP/LT) Complex, a pluri-kilometer thick sequence comprising metavolcanic rocks with oceanic affinities and metasedimentary rocks. In this study, the deepest segments of the Chilean subduction interface in Patagonia are characterized for the first time. Despite its apparent homogeneity, the complex is actually composed of two tectonic units with distinct ages of metamorphism and thermal evolution: the garnet amphibolite (GA) and the underlying blueschist (BS) units. The GA unit mafic rocks exhibit epidote, phengite, titanite, rutile, chloritoid and paragonite inclusions in prograde garnet I, diopside + albite intergrows replacing omphacite inclusions in garnet II, and relict omphacite (XJd45) included in edenitic-pargasitic amphiboles. Thermobarometric results show that these rocks were buried along a relatively cold prograde path (c. 11 °C/km) and reached eclogite-facies near peak pressure conditions (c. 550–600 °C, 1.6 GPa). The GA unit underwent a pervasive stage of amphibolitization during decompression at c. 1.3 GPa. Field and petrological observations, together with multi-mineral Rb-Sr dating, indicate that amphibolitization of the GA unit took place along the subduction interface at c. 120 Ma in a slightly warmer subduction regime (c. 13–14 °C/km), in agreeement with the formation of coetanoeus amphibolites at c. 35 km. The underlying BS unit (i) yields four consistent Rb-Sr deformation ages of c. 80 Ma, i.e. 40 Ma younger than the overlying rocks from the GA unit; (ii) exhibits slightly cooler peak metamorphic conditions (c. 520–550 °C, 1.6 GPa) indicating burial along a prograde path of c. 10 °C/km (iii) does not show amphibolite-facies overprint as seen in the GA unit. After a long residence time under amphibolite-facies conditions, the amphibolitized rocks of the GA unit partly recrystallized during blueschist-facies deformation at around 80 Ma, as shown by silica-richer rims around phengite and glaucophane overgrowths around hornblende. These new results: (i) shed light on the dynamics of the deep Chilean paleo-accretionary wedge, (ii) reveal that the GA unit underwent two stages of exhumation, likely juxtaposed with the BS unit near 40 km depth, and (iii) suggest that the subduction thermal gradient on Diego de Almagro Island fluctuated between c. 10–11 °C/km and 13–14 °C/km during Cretaceous times." @default.
- W2521001873 created "2016-09-23" @default.
- W2521001873 creator A5003578228 @default.
- W2521001873 creator A5004152313 @default.
- W2521001873 creator A5021607748 @default.
- W2521001873 creator A5042871219 @default.
- W2521001873 creator A5045319666 @default.
- W2521001873 creator A5055891841 @default.
- W2521001873 creator A5080140980 @default.
- W2521001873 date "2016-11-01" @default.
- W2521001873 modified "2023-09-30" @default.
- W2521001873 title "Eclogite-, amphibolite- and blueschist-facies rocks from Diego de Almagro Island (Patagonia): Episodic accretion and thermal evolution of the Chilean subduction interface during the Cretaceous" @default.
- W2521001873 cites W1830358639 @default.
- W2521001873 cites W1960465926 @default.
- W2521001873 cites W1968617532 @default.
- W2521001873 cites W1973391032 @default.
- W2521001873 cites W1978177807 @default.
- W2521001873 cites W1981308828 @default.
- W2521001873 cites W1990738669 @default.
- W2521001873 cites W1996412456 @default.
- W2521001873 cites W2000299281 @default.
- W2521001873 cites W2002465384 @default.
- W2521001873 cites W2009322759 @default.
- W2521001873 cites W2010101678 @default.
- W2521001873 cites W2010668132 @default.
- W2521001873 cites W2011952615 @default.
- W2521001873 cites W2012774838 @default.
- W2521001873 cites W2012817150 @default.
- W2521001873 cites W2014812434 @default.
- W2521001873 cites W2016804624 @default.
- W2521001873 cites W2025800584 @default.
- W2521001873 cites W2034681925 @default.
- W2521001873 cites W2034682777 @default.
- W2521001873 cites W2035634208 @default.
- W2521001873 cites W2038325228 @default.
- W2521001873 cites W2048492168 @default.
- W2521001873 cites W2048742589 @default.
- W2521001873 cites W2052663957 @default.
- W2521001873 cites W2062659036 @default.
- W2521001873 cites W2066931531 @default.
- W2521001873 cites W2073756797 @default.
- W2521001873 cites W2077668940 @default.
- W2521001873 cites W2082975335 @default.
- W2521001873 cites W2086778250 @default.
- W2521001873 cites W2086959586 @default.
- W2521001873 cites W2088547125 @default.
- W2521001873 cites W2090531886 @default.
- W2521001873 cites W2091229920 @default.
- W2521001873 cites W2093656549 @default.
- W2521001873 cites W2095441492 @default.
- W2521001873 cites W2096997717 @default.
- W2521001873 cites W2097804664 @default.
- W2521001873 cites W2100411277 @default.
- W2521001873 cites W2101971254 @default.
- W2521001873 cites W2102908417 @default.
- W2521001873 cites W2105353951 @default.
- W2521001873 cites W2108597026 @default.
- W2521001873 cites W2111451105 @default.
- W2521001873 cites W2113037906 @default.
- W2521001873 cites W2119325206 @default.
- W2521001873 cites W2121440949 @default.
- W2521001873 cites W2130439244 @default.
- W2521001873 cites W2130620697 @default.
- W2521001873 cites W2136200398 @default.
- W2521001873 cites W2137335718 @default.
- W2521001873 cites W2146803029 @default.
- W2521001873 cites W2149944078 @default.
- W2521001873 cites W2150281822 @default.
- W2521001873 cites W2158648190 @default.
- W2521001873 cites W2160919983 @default.
- W2521001873 cites W2161188118 @default.
- W2521001873 cites W2161362789 @default.
- W2521001873 cites W2163335048 @default.
- W2521001873 cites W2216663700 @default.
- W2521001873 cites W2309281539 @default.
- W2521001873 cites W2320645792 @default.
- W2521001873 cites W2417540702 @default.
- W2521001873 cites W244679186 @default.
- W2521001873 cites W2946678176 @default.
- W2521001873 cites W4233848018 @default.
- W2521001873 doi "https://doi.org/10.1016/j.lithos.2016.09.001" @default.
- W2521001873 hasPublicationYear "2016" @default.
- W2521001873 type Work @default.
- W2521001873 sameAs 2521001873 @default.
- W2521001873 citedByCount "21" @default.
- W2521001873 countsByYear W25210018732017 @default.
- W2521001873 countsByYear W25210018732018 @default.
- W2521001873 countsByYear W25210018732019 @default.
- W2521001873 countsByYear W25210018732020 @default.
- W2521001873 countsByYear W25210018732021 @default.
- W2521001873 countsByYear W25210018732022 @default.
- W2521001873 countsByYear W25210018732023 @default.
- W2521001873 crossrefType "journal-article" @default.
- W2521001873 hasAuthorship W2521001873A5003578228 @default.
- W2521001873 hasAuthorship W2521001873A5004152313 @default.
- W2521001873 hasAuthorship W2521001873A5021607748 @default.
- W2521001873 hasAuthorship W2521001873A5042871219 @default.
- W2521001873 hasAuthorship W2521001873A5045319666 @default.