Polyphase, High-Temperature Eclogite-Facies Metamorphism in the Chuacús Complex, Central Guatemala: Petrology, Geochronology, and Tectonic Implications

Ortega-Gutiérrez, Fernando; Solari, Luigi; Solé, Jesús; Martens, Uwe; Gómez-Tuena, Arturo; Morán‐Ical, Sergio; Reyes‐Salas, Margarita

doi:10.2747/0020-6814.46.5.445

Cited by 47 publications

(54 citation statements)

References 57 publications

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“…A new UHP terrane has been suggested from the Chuacús metamorphic belt in central Guatemala (Ortega-Gutiérrez et al, 2004). The Chuacús complex contains blocks, lenses and layers of HP-UHP eclogites and amphibolitized eclogites in quartzofeldspathic gneiss.…”

Section: Recently Recognized Uhp Terranesmentioning

confidence: 99%

Ultrahigh-pressure minerals and metamorphic terranes – The view from China

Liou

Ernst

Zhang

et al. 2009

Journal of Asian Earth Sciences

318

161

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Section: Recently Recognized Uhp Terranesmentioning

confidence: 99%

Ultrahigh-pressure minerals and metamorphic terranes – The view from China

Liou

Ernst

Zhang

et al. 2009

Journal of Asian Earth Sciences

318

161

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“…Most of these complexes are characterized by blueschist, eclogite, and other HP-LT rock types that are indicative of a subduction zone environment. In the Middle America and Caribbean regions (Figure 1), Late Jurassic to Eocene HP-LT rocks are exposed almost continuously from California to Baja California (Sedlock et al 1993;Patrick and Day 1995), in the central Pacific region of Mexico (Talavera-Mendoza 2000), along the Motagua valley in Guatemala (Harlow et al 2004;Ortega-Gutiérrez et al 2004), in southeastern Jamaica (Lewis et al 1973;Draper 1986), throughout Cuba (Somin et al 1992;Schneider et al 2004;García-Casco et al 2006;Stanek et al 2006), along the northern coast of the Dominican Republic (Giaramita and Sorensen 1994;Abbott et al 2005;Krebs et al 2008), in the Puerto Rico Trench (Perfit et al 1980), along the Caribbean mountain systems of Venezuela and northern Colombia (Green et al 1968;Stöckhert et al 1995;Sisson et al 1997;Smith et al 1999), along the Central Cordillera of Colombia (Orrego et al 1980;Feininger 1982;Bustamante 2008), and in the southern Pacific region of Ecuador (Feininger 1980;Arculus et al 1999;Bosch et al 2002). These HP-LT rocks occur as (1) coherent oceanic and continental metamorphic belts (e.g.…”

Section: Introductionmentioning

confidence: 99%

Metamorphic history of riebeckite- and aegirine-augite-bearing high-pressure–low-temperature blocks within the Siuna Serpentinite Mélange, northeastern Nicaragua

Flores

Skora

Martin

et al. 2015

International Geology Review

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The Siuna Serpentinite Mélange (SSM) is a subduction-zone-related complex that contains diverse blocks of igneous and sedimentary origin, overprinted by various metamorphic conditions. The SSM is located at the southern border of the Chortís block and marks the boundary between continental and oceanic crusts in the western margin of the Caribbean Plate. The serpentinite matrix mainly consists of lizardite/chrysotile, Cr-rich spinel, and relict orthopyroxene that suggest a harzburgitic protolith and an upper mantle supra-subduction zone origin. Blocks within the southern and central regions range from Jurassic pelagic sediments to mafic/intermediate igneous rocks that are metamorphosed to various degrees, ranging from prehnite-pumpellyite/greenschist to likely blueschist facies (e.g. riebeckite-bearing metashale) conditions. In contrast, the northern section encloses almost exclusively epidote-amphibolite facies metabasite blocks, and minor micaand chlorite-rich rocks of metasomatic origin, respectively. Some of the epidote-amphibolite blocks contain relic garnet-rich zones embedded in an amphibole-rich matrix. The garnets appear to record two generations of growth and contain mineral inclusions such as amphibole, apatite, titanite, aegirine-augite, and quartz. Thermobarometric estimates for the garnet-rich zones and epidote-amphibolite-rich matrix suggest a prograde blueschist facies at~1.2 GPa and 400-450°C, an eclogite facies metamorphic peak at 1.5-1.7 GPa and 565-614°C, and a post-peak epidote-amphibolite facies metamorphism. These pressure and temperature estimates indicate a classical clockwise PT path that has been observed in many palaeo-subduction zone environments worldwide. Phengite Ar-Ar dating of mica-rich rock yields 140 Ma and suggests an Early Cretaceous exhumation along the southern edge of the continental Chortís block.

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“…Ablation of zircons was conducted using a New Wave/ Lambda Physik DUV193 Excimer laser, operating at a wavelength of 193 nm (Gehrels et al 2008). K-Ar dating was performed at the Laboratorio Universitario de Geoquímica Isotópica (LUGIS) of the Universidad Nacional Autónoma de México (UNAM) (see Morán-Zenteno et al 2004 andOrtega-Gutiérrez et al 2004 for details).…”

Section: Analytical Methods and Proceduresmentioning

confidence: 99%

The exhumed Eocene Sultepec-Goleta Volcanic Center of southern Mexico: record of partial collapse and ignimbritic volcanism fed by wide pyroclastic dike complexes

Díaz-Bravo

Morán-Zenteno

2011

Bull Volcanol

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The Sultepec-Goleta area in southern Mexico hosts one of the major Eocene silicic volcanic centers that make up the Cenozoic volcanic record of the north-central part of the Sierra Madre del Sur. This center is represented by a partially exhumed NNE-SSW trending ignimbritic field that covers an area of ∼400 km 2 with a preserved volume of ∼200 km 3 . A remarkable feature of volcanic center is the exposure of pyroclastic dike complexes up to 1 km wide that extend almost continuously along the western and southern flanks of the volcanic field. The ignimbritic record comprises four units with different textural features as well as variable proportions of the main components (i.e. phenocrysts, pumice and lithic clasts). The most extensive unit is the basal Goleta Ignimbrite, of which the middle and upper members are richer in phenocrysts than the lower member. It has a thickness that ranges from ∼200 m in the north to at least 600 m in the south of the volcanic center. The overlying ignimbrite units (Cienega, Lobera and Potrero ignimbrites) are phenocryst-poor and are distributed in the northern sector of the volcanic field. The semicurvilinear trend of the pyroclastic dikes along the southern flank of the Goleta Range, coupled with the greater thickness of the Goleta Ignimbrite encircled by the dikes, is indicative of the development of a partial-collapse caldera. Based on spatial relationships as well as analogies in the nature and abundances of the components, it has been recognized that the central and southern dike complexes fed the relatively phenocrystrich Goleta Ignimbrite, whereas the phenocryst-poor units of the northern sector were extruded through the pyroclastic conduits distributed around Sultepec. We suggest that the stirring produced by the partial collapse of the magma chamber roof beneath the southern sector of the study area triggered the tapping of phenocryst-rich portions of the zoned magma chamber, resulting in an increase of phenocryst content in the upper members of the Goleta Ignimbrite. The presence of breccias and lithic-rich facies dominated by wallrock fragments at the borders of the pyroclastic dikes, including those of the northern extra-caldera sector, indicate that erosion of the conduit walls above the fragmentation level contributed to widening of the conduits and the construction of wide dike complexes.

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Polyphase, High-Temperature Eclogite-Facies Metamorphism in the Chuacús Complex, Central Guatemala: Petrology, Geochronology, and Tectonic Implications

Cited by 47 publications

References 57 publications

Ultrahigh-pressure minerals and metamorphic terranes – The view from China

Ultrahigh-pressure minerals and metamorphic terranes – The view from China

Metamorphic history of riebeckite- and aegirine-augite-bearing high-pressure–low-temperature blocks within the Siuna Serpentinite Mélange, northeastern Nicaragua

The exhumed Eocene Sultepec-Goleta Volcanic Center of southern Mexico: record of partial collapse and ignimbritic volcanism fed by wide pyroclastic dike complexes

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