| | Report (chapter) | and lithostructural characteristics of these ophiolite complexes, suggest that the Rocas Verdes basin...Storey & Mair 1982), and 139 âą 2 Ma for the Sarmiento complex, the northernmost in the Rocas Verdes belt...16, 2015 666 C. R. STERN & M. J. DE WIT Sarmiento Complex Recent volcanic rocks Shales (Lower Cretaceous)... 54~ 55 ~ 0 100 ~ ' Beage lCanaJ "Tortuga Complex 200 km Is.Hoste 56 ~ 75 ~ I 70 ~ f Cape Horn...Alabaster 1991). The mafic rocks of the Tortuga complex, the southemmost in the Rocas Verdes belt, are | | CALDER^|^Oacute;N, M., PRADES, C. F., HERV^|^Eacute;, F., AVENDA^|^Ntilde;O, V., FANNING, C. M., MASSONNE, H.-J., THEYE, T., SIMONETTI, A. (2013) Petrological vestiges of the Late Jurassic-Early Cretaceous transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the Capit^|^aacute;n Aracena, Carlos III, and Tortuga ophiolitic complexes. GEOCHEMICAL JOURNAL, 47 (2) 201-217 doi:10.2343/geochemj.2.0235 | Journal (article/letter/editorial) | transition from rift to back-arc basin in southernmost Chile: New age and geochemical data from the CapitĂĄn Aracena...MatemĂĄticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile 2 Escuela de Ciencias de la...AndrĂ©s Bello, Salvador Sanfuentes 2375, Santiago, Chile 3 Research School of Earth Sciences, The Australian...spreading/magmatic axis. In the Early Cretaceous Tortuga Complex, tholeiitic basalts are comparable to normal mid-oceanic...et al., 2001) that obtain energy INTRODUCTION Ophiolite complexes, the igneous constituents of idealized | | | Journal (article/letter/editorial) | margin of South America [ 1,2,5,9-11] ; (2) the ophiolite sequences, consisting of tholeiitic lavas, dikes...volcanic rocks crop out along both edges of the ophiolite lenses (Fig. 2) [2], although on the Pacific side...paleontologically, apparently thin and pinch out rapidly. In Chile the volcanics belong to the E1 Quemodo Formation...across the eastern margin of the Sarmiento ophiolite complex in Chile near 52°S, in the areas labeled...along the southern shore of Seno Almirantazgo in Chile, about 100 km to the west, and contains Oxfordian-Kimmeridgian | | | Journal (article/letter/editorial) | The geology of central Isla Hoste, southern Chile: sedimentation, magmatism and tectonics in part of...Pacific side of a Mesozoic back-arc basin in southern Chile, behind a magmatic arc represented by the Patagonian...oceanic lithosphere which is now seen as partial ophiolite sequences (Dalziel et al. 1974; Stern, De Wit...and to the NE by the shales of the pericratonic Magallanes Basin (Fig. 1; Natland et al. 1974; Dalziel et...cordillera was deposited in the rapidly subsiding Magallanes Basin (Scott, 1966; Winslow, in press). Isla | | | Report (chapter) | Modelling of oxygen-isotope data from the Sarmiento ophiolite complex, Chile D. Elthon, J. R. Lawrence, R. E....oxygen-isotope investigation of the Sarmiento ophiolite complex show that the extrusive rocks are isotopically...water/rock ratios of 15 to 90. Within the sheeted dyke complex and the plutonic section, the inferred water/rock...1978). It is now generally accepted that most ophiolite complexes represent uplifted sections of oceanic...petrological and geochemical investigations of ophiolite complexes have often been undertaken in an effort | | | Journal (article/letter/editorial) | del Fuego and their provenance implications for Magallanes basin sediments Khandaker M. Zahid â, David L...Provenance South America a b s t r a c t The Magallanes foreland basin, located along the northern periphery...Cretaceous to lower Oligocene mudstones of the eastern Magallanes basin, Argentina. The REE patterns of all of...successions and an Eastern Andean metamorphic complex provenance for the younger sediments. The lower...(2013) 69â81 48oS FUEGIAN ANDES TECTONIC ELEMENTS Magallanes Foreland Basin Basement Rocas Verdes Marginal | | | Journal (article/letter/editorial) | del Fuego, most markedly to the south of the Magallanes-Fagnano and Beagle Channel fault systems (Figure...strike-slip displacement have accumulated on the Magallanes-Fagnano fault zone since T Oligocene times...that included lengths of the Beagle Channel and Magallanes-Fagnano fault zones along with at least one further...Tortuga complex and oblique-dextral divergence in that now occupied by the Sarmiento complex. The estimated...present-day 15 km outcrop width of the Tortuga ophiolite would require between 330 km and 170 km of oblique | | | Journal (article/letter/editorial) | c a t e / s e d g e o Provenance of eastern Magallanes foreland basin sediments: Heavy mineral analysis...the Late Cretaceous to early Miocene eastern Magallanes basin of southernmost Argentina. Our data indicate...derived from the Cordillera Darwin metamorphic complex. Together, these data indicate an abrupt shift...the Scotia Arc. Studying the sediments of the Magallanes basin of the southernmost Andes is â Corresponding...mineral analyses of sandstones from the eastern Magallanes foreland basin of southern Argentina, which provide | | MALONEY, K. T., CLARKE, G. L., KLEPEIS, K. A., FANNING, C. M., WANG, W. (2011) Crustal growth during back-arc closure: Cretaceous exhumation history of Cordillera Darwin, southern Patagonia. Journal of Metamorphic Geology, 29 (6) 649-672 doi:10.1111/j.1525-1314.2011.00934.x | Journal (article/letter/editorial) | Australia ABSTRACT The Cordillera Darwin metamorphic complex is unique in the Andes in exposing kyaniteâstaurolite... v v v v v v v v v v 51°S Tortuga Sarmiento Tobifera Fm Darwin Granite Patagonian Batholith...v v v Basement 6000 v v v mafic rocks Ophiolite Upper Jurassic v v v Zapata Fm Volcanoclastic...(sedimentary) K3 126-75 v v v v v v v Magallanes foreland basin Extension v v v v v v Lago...Malvinas Basin v v v v Sarmiento ophiolite (Ultima Esperanza) v Magallanes Basin 4000 2000 Tierra | | | Journal (article/letter/editorial) | or ophiolitic breccias that lack a sheeted dyke complex. Stable isotopic data on these unusual ophiolites...volcanics. If the â*O enrichment of the east Ligurian ophiolite is typical of other stratigraphically similar...Introduction Oxygen isotopic studies of large ophiolite complexes such as the Troodos (Cyprus) and Semail...-ka --- Vara Complex (Jur.-Paleocene) Trebbia Supergroup (UCret.) m B Canatelo Complex (Paleogene) CONTINENTAL...main outcrop area of the ophiolite-pelagic sediment sequence of the Vara Complex (Decandia and Elk, 1972) | | CalderĂłn, M., HervĂ©, F., Massonne, H.-J., Tassinari, C.G., Pankhurst, R.J., Godoy, E., Theye, T. (2007) Petrogenesis of the Puerto EdĂ©n Igneous and Metamorphic Complex, Magallanes, Chile: Late Jurassic syn-deformational anatexis of metapelites and granitoid magma genesis. Lithos, 93 (1) 17-38 doi:10.1016/j.lithos.2006.03.044 | Journal (article/letter/editorial) | the Puerto EdĂ©n Igneous and Metamorphic Complex, Magallanes, Chile: Late Jurassic syn-deformational anatexis...de GeologĂa, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile Institut fĂŒr Mineralogie und...GeologĂa y MinerĂa, Avda. Santa MarĂa 0104, Santiago, Chile b c Received 29 May 2005; accepted 22 March 2006...granitoids from the Puerto EdĂ©n Igneous and Metamorphic Complex (PEIMC) and biotiteâhornblende granitoids of the...the South Patagonian batholith (southern Chile) has been studied. For that purpose, the chemistry of minerals | | | Journal (article/letter/editorial) | GeologıÌa, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile b a r t i c l e i n f o ...siliciclastic rocks of the marine Cretaceous Magallanes/Austral foreland basin. Furthermore, its location...2010). Similarly, in glaciated orogenic wedges, complex patterns of glacial excavation affect the morphology...orogenic belt. 200 LOF Z 6 Ma Chile Ridge 505 180 60 120 s a Chile a h Trenc 14 M 18 M a ANTARCTIC...ina Chile 50°S This study (location of Fig. 2) 60 Fu 75°W egia n Ande s 70°W Magallanes Fagnano | | | Report (chapter) | Cretaceous volcanic rocks in Colombia, Peru and Chile indicates that: (i) ocean-floor metamorphism (high-T...separates the Northern and Central Andes, and the Chile Rise (Nazca-Antarctica plate boundary) marks the...Ocoite Group in central Chile; and (iv) the Rocas Verdes Group in southernmost Chile (Fig. 1). These units...b Peru ", i "" i I Bohwa 1,... ..... ,:-- Chile..; iI Âą~ s ,'t ; g " i i Ocoife ', Group ...from GR-MS to the Chile Rise (CHR); the Patagonian Andes lies to the south of the Chile Rise. Modified from | | | Journal (article/letter/editorial) | and crystallization of peridotite and gabbro in ophiolite complexes. In the Vourinos, only harzburgite has...phases of deformation in gabbro in much of the complex are interprNed as effects of intense deformation...pile. Gabbroic augen gneiss in the Bay of Islands Complex (Newfoundland, Canada) and widespread tight folding...and ultramafic rocks together in the Zambales Complex (Philippines) are cited as additional evidence...gabbro as metavolcanic rocks in the Tin:,_quillo Complex and at the Lizard (Cornwall, England). INTRODUCTION | | | Journal (article/letter/editorial) | Abstract. The Sarmiento and Tortuga complexes are two mafic complexes located in southern Chile that represent...back-arc basin. Basaltic dikes and lavas within each complex exhibit tholeiite differentiation trends whereby...with an increasing negative Eu anomaly. The Sarmiento complex contains intermediate icelandites and silicic...which are conspicuously absent in the Tortuga complex. These non-basaltic compositions have higher Zr...variations. Significantly, in basalts from the Tortuga complex, incompatible elements (Zr, Y, REE) increase in | | Barbeau, David L., Olivero, Eduardo B., Swanson-Hysell, Nicholas L., Zahid, Khandaker M., Murray, Kendra E., Gehrels, George E. (2009) Detrital-zircon geochronology of the eastern Magallanes foreland basin: Implications for Eocene kinematics of the northern Scotia Arc and Drake Passage. Earth and Planetary Science Letters, 284 (3) 489-503 doi:10.1016/j.epsl.2009.05.014 | Journal (article/letter/editorial) | Detrital-zircon geochronology of the eastern Magallanes foreland basin: Implications for Eocene kinematics...Cretaceous through Oligocene strata of the eastern Magallanes foreland basin of southernmost Argentina records...metasedimentary rocks of the Cordillera Darwin metamorphic complex, respectively. Exposures of these units occur in... 1986) and (4) signiïŹcant contraction in the Magallanes basin foldâ thrust belt during the Eocene (Torres...adjacent to the Fuegian Andes in the eastern Magallanes foreland basin that is coeval with other evidence | | | Book | continue in the Patagonian Andes of Argentina and Chile over the last years. As a result of this extensive...involved in this complex evolution. Seismicity in the southernmost South America and its complex relation with...de GeologĂa, Universidad Andres Bello, Santiago, Chile Graeme Eagles Helmholtz Centre for Marine and Polar...de GeologĂa, Universidad Andres Bello, Santiago, Chile Gonzalo Galaz Departamento de GeologĂa Regional...Bello, Santiago, Chile; Departamento de GeologĂa, Universidad de Chile, Santiago, Chile Marco MafïŹone Department | | | Journal (article/letter/editorial) | received June 15, 1982 In the Bay of Islands ophiolite complex both the basal part of the cumulate gabbro...faults [5,6]. In the Bay o f I s l a n d s ophiolite complex, Newf o u n d l a n d , the b a s a l p a...The Bay of Islands ophiolite: specific characters The Bay of Islands ophiolite complex is located on the...com- LEGEND LOWER ORDOVICIAN AND CAMBRIAN Ophiolite Ophiolite CloltiÂą I Mofite$ Peridotite$ Altochthon...similar [7], only a synthetic cross section for the ophiolite is presented here. The ophiolitic sequence comprises | | | Journal (article/letter/editorial) | OXYGEN AND HYDROGEN ISOTOPE EVIDENCE IN THE XIGAZE OPHIOLITE (TIBET, CHINA)* P I E R R E A G R I N I E R 1...in the Xigaze ophiolite (Tibet, China). Chem. Geol., 71:313-335. The Xigaze ophiolite locally displays...2 5 0 and - 100%o) For the mafic part of the ophiolite, the isotopic compositions correspond to hydrothermal...meteoric fluids after the obduction. The Xigaze ophiolite sequence displays very little ~SO-depletedrocks...Elsevier Science Publishers B.V. 314 the Xigaze ophiolite sequenceand the seawater is an 1sO depletion of | | | Journal (article/letter/editorial) | on the mechanisms of back-arc spreading? Many ophiolite complexes are now regarded as the abducted floors...extended loop of the Scotia Arc, represents a complex zone of microplates at the boundary of two major...(WEAVER ef N/., to be published): 3-Sarmiento ophiolite complex, Chile (SAUNDERS et (I/., 1978); 4---Lau...shows the source for ocean ridge basalts to be complex and probably heterogeneous in composition (OâNIONS...erupted at mid-ocean ridges. Moreover, because many ophiolite complexes are thought more basins, island a7 | | | Journal (article/letter/editorial) | Granulite-Facies Metacumulates of the Yakuno Ophiolite, Japan: Evidence for Unusually Thick Oceanic Crust...cumulates, and residual peridotites of the Yakuno ophiolite were thoroughly metamorphosed before its emplacement...Metamorphic grade increases downward through the ophiolite succession, and reaches granulite facies in the...metavolcanics and metacumulates suggests that the Yakuno ophiolite may be a fragment of unusually thick oceanic crust...beneath a small oceanic basin. INTRODUCTION Ophiolite complexes generally are metamorphosed prior to | | Feraud, G., Alric, V., Fornari, M., Bertrand, H., Haller, M. (1999) 40Ar/39Ar dating of the Jurassic volcanic province of Patagonia: migrating magmatism related to Gondwana break-up and subduction. Earth and Planetary Science Letters, 172 (1) 83-96 doi:10.1016/s0012-821x(99)00190-9 | Journal (article/letter/editorial) | this trend with the opening of the Rocas VerdesâSarmiento marginal basin favors a spaceâtime evolution of...Peninsula, ANT D Antarctica, RVS D Rocas VerdesâSarmiento basin. The assumed mantle plume head of Karoo...uncertain. A marginal oceanic basin (Rocas VerdesâSarmiento basin) related to this subduction, and in a back-arc...Fig. 7. The location of the future Rocas VerdesâSarmiento marginal basin is indicated on both maps. suggested...related to the formation of the Rocas VerdesâSarmiento marginal basin, at the end of this period. It | | | Journal (volume) | :.1/.. . "/\-,-/ ,;;~O U T O K U M P U d:=. COMPLEX ,-...., 1.97 G'; \ 1- \ Fig. 2. Stratigraphy...contact and are entangled with the Outokumpu ophiolite complex (Koistinen, 1981; Vuollo and Piirainen, 1989c)dated...1, anal. 12) and inside the Archaean basement complex (Table 1, anal. 13) is oligoclase. The albitic...deposited before the emplacement of the Outokumpu ophiolite. These results also raise an interesting question...tholeiites are of the same age as the Outokumpu ophiolite complex in the western part of the area (Huhma, 1986) | | | Report (chapter) | crustal gabbroic rocks of the Bay of Islands ophiolite complex, Newfoundland, Canada: evidence from mineral...gabbroic crust of the Ordovician Bay of Islands ophiolite complex formed in an island-arc setting near the North...ophiolitic crust in the Bay of Islands ophiolitic complex occurred mainly along pre-obduction oceanic structures...in an intraoceanic setting. Most oceanic and ophiolite gabbros experienced syn-oceanic hydrothermal alteration...massif (NAM) of the Bay of Islands ophiolitic complex (BOIC), Newfoundland, Canada, documents several | | | Journal (article/letter/editorial) | based base on geochemical data. A sheeted dyke complex, with supra-subduction zone geochemical characteristics... 2007). However, the presence of that sheeted complex has been questioned by Nutman and Friend (2007)...from a paleo-spreading structure in the Oman ophiolite. Earth Planet. Sci. Lett. 139, 177â194. Anhaeusser...Nelshoogte schist and Stolzburg layered ultramaïŹc complex, Barberton greenstone belt, South Africa. S. African...ranodiorite (TTG) magmatism in the Smartville Complex, Northern California with a note on LILE depletion |
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