 | | Report (chapter) | | and lithostructural characteristics of these ophiolite complexes, suggest that the Rocas Verdes basin...Storey & Mair 1982), and 139 • 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 Capitán Aracena...Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile 2 Escuela de Ciencias de la...Andrés 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) | | 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...whereas hydrothermal fluids in equilibrium with greenschist-facies assemblages(230-525~ have 6~sO = 0 to...1978). It is now generally accepted that most ophiolite complexes represent uplifted sections of oceanic |  | 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 kyanite–staurolite... 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) | | 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 |  | | 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 ¢~ s ,'t ; g " i i Ocoife ', Group ...epidote + No assemblages diagnostic of the greenschist facies were reported. Group I among others) |  | Calderón, M., Hervé, F., Massonne, H.-J., Tassinari, C.G., Pankhurst, R.J., Godoy, E., Theye, T. (2007) Petrogenesis of the Puerto Edén 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 Edén Igneous and Metamorphic Complex, Magallanes, Chile: Late Jurassic syn-deformational anatexis...de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile Institut für Mineralogie und...Geología y Minería, Avda. Santa María 0104, Santiago, Chile b c Received 29 May 2005; accepted 22 March 2006...granitoids from the Puerto Edén Igneous and Metamorphic Complex (PEIMC) and biotite–hornblende granitoids of the...the South Patagonian batholith (southern Chile) has been studied. For that purpose, the chemistry of minerals |  | | Journal (article/letter/editorial) | | Geologı́a, 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 |  | 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) significant contraction in the Magallanes basin fold– thrust belt during the Eocene (Torres...adjacent to the Fuegian Andes in the eastern Magallanes foreland basin that is coeval with other evidence |  | | Journal (article/letter/editorial) | | or ophiolitic breccias that lack a sheeted dyke complex. Stable isotopic data on these unusual ophiolites...volcanics. If the ‘*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) |  | | 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 Geología, Universidad Andres Bello, Santiago, Chile Graeme Eagles Helmholtz Centre for Marine and Polar...de Geología, Universidad Andres Bello, Santiago, Chile Gonzalo Galaz Departamento de Geología Regional...Bello, Santiago, Chile; Departamento de Geología, Universidad de Chile, Santiago, Chile Marco Maffione 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 Clolti¢ 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) | | 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) | | 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...with seawaterderived fluids under zeolite to greenschist facies but the trondjhemites were additionally...subsequently were pervasively reacted under greenschist-zeolite-facies conditions during which the high-~SO |  | | 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 |  | | Book (volume) | | Precambrian Part of the Eastern Cordillera: The Marafion Complex .............................. 219 220 220 222...surrounding the North Pacific Basin, with their complex lithologies, must be ignored. A few types of sedimentary...is fed by the equatorial countercurrent and the Chile Current. The western equatorial Pacific is characterized...Chase, 1975; GEBCO, 1975) portray an even more complex bathymetry; for example, Murray (1941, 1945) and...to information from the published literature. A complex graphic scheme for portraying lithologies involved |  | | 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...temperatures from upper amphibolite facies to greenschist-amphibolite transitional facies. An increase |  | | Journal (article/letter/editorial) | | with island arc affinities within the vourinos ophiolite L. Beccaluva 1, D. Ohnenstetter 2, M. Ohnenstetter...Orl6ans Cedex, France Abstract. Within the Vourinos ophiolite evidence of two magmatic series has been preserved...arc origin has been proposed for the Vourinos ophiolite based largely on geochemical evidence (Miyashiro...1980) it has been pointed out that the Vourinos ophiolite has been generated in the vicinity of a continental...The d o m i n a n t lithology in the Vourinos ophiolite is mantle harzburgite considered by M o o r e |  | Bach, Wolfgang, Alt, Jeffrey C., Niu, Yaoling, Humphris, Susan E., Erzinger, Jörg, Dick, Henry J.B. (2001) The geochemical consequences of late-stage low-grade alteration of lower ocean crust at the SW Indian Ridge: results from ODP Hole 735B (Leg 176) Geochimica et Cosmochimica Acta, 65 (19) 3267-3287 doi:10.1016/s0016-7037(01)00677-9 | Journal (article/letter/editorial) | | gabbroic rocks recovered from Hole 735B preserve a complex record of plastic and brittle deformation and hydrothermal...the hole (500 –1500 mbsf) has been affected by a complex and multistage low-temperature (⬍250°C) alteration...spreading rate) are characterized by lithologically complex lithosphere that generally lacks a well-organized...gabbroic rocks recovered from Hole 735B preserve a complex record of magmatic, tectonic, and metamorphic processes...Nonoxidative/⬍1% Nonoxidative/4% Nonoxidative/2% Greenschist-fac./2% Compositional changes ⫹Cs, Rb, K, U |  | | Journal (article/letter/editorial) | | oceanic-like lithosphere (known as the Jamestown Ophiolite Complex), which was obducted, approximately 45 Ma...degree of hydration of the 3.49 Ga Jamestown Ophiolite Complex are similar to present day subseafloor hydrothermal...faulting/d6collement Metamorphism: hydration; greenschist to amphibolite; silicification-chert formation...belt with rocks recording 450 million years of complex tectonothermal events (Armstrong et al., 1990;...this inferred Barberton ophiolite (referred to as the Jamestown Ophiolite Complex-JOC; de Wit et al., 1987b) |  | | Journal (article/letter/editorial) | | alteration process. Geological background The Pechenga complex is situated in the northwestern corner of the Kola...the Pechenga Group were metamorphosed under greenschist to prehnite-pumpellyite facies in the central...amphibolite facies towards the marginal parts of the complex. The rocks in the study area are generally nonschistose...systems can not be directly applied to natural, more complex systems. However, the sense of element partitioning...accompanying degradation in prehnitepumpellyite to low greenschist facies. According to Hughes (1977), the chloritic |  | | 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...grade of metamorphism most likely corresponds to greenschist facies, but the mineral proportions are different...deposited before the emplacement of the Outokumpu ophiolite. These results also raise an interesting question |  | | Journal (article/letter/editorial) | | various extents, as well as metabasites of the greenschist facies and amphibolites. Van Andel and Bowin...40°04'W, depth 4280 m), where metabasalts of the greenschist facies were dredged from the floor of the median...and Ehlers [132] reported finding rocks of the greenschist facies in the rift valley in the Mid-Atlantic...characteristic igneous textures. Metabasites of the greenschist facies, includ ing schists, have been observed...rift valley near 6°N had been altered under greenschist-facies conditions, along with the basalts cutting |  | | Book | | Spreading-rate paran1eters in ocean crust: analogue for ophiolite? .......... . SMEWl:---JG, J. D., C HRISTENSEN...variation within the Cumu late Sequence of the Oman ophiolite: mag,na cha ,nber depth and petrological implications...North Arm Mountain massif of the Bay of Islands ophiolite, Newfoundland ..................................Petrology of the Upper Pillow Lava suite, Troodos ophiolite, Cyprus .................... .. ................Modelling of oxygen-isotope data from the Sarmiento ophiolite complex, Chile ................................ |
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