Permian–Carboniferous arc magmatism in southern Mexico: U–Pb dating, trace element and Hf isotopic evidence on zircons of earliest subduction beneath the western margin of Gondwana

Ortega‐Obregón, Carlos; Solari, Luigi Augusto; Gómez-Tuena, Arturo; Elı́as-Herrera, Mariano; Ortega-Gutiérrez, Fernando; Macı́as-Romo, Consuelo

doi:10.1007/s00531-013-0933-1

Cited by 93 publications

(44 citation statements)

References 59 publications

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“…In order to interpret the potential source areas of the detrital zircons from the Atasta and Alvarado beach areas, database of rock geochemistry, 206 Pb/ 238 U ages, and REE chemistry of zircon from the southern Mexico were constructed from numerous references as shown in Figures , 12 and 13. The source areas, which we included in our database, are the Chiapas Massif Complex (Weber, Schaaf, Valencia, Iriondo, & Ortega‐Gutiérrez, ; Weber et al, , n = 187; Witt, Brichau, & Carter, , n = 718), Chaucus Complex (Solari et al, , n = 436), Oaxacan Complex (Ortega‐Obregón et al, , n = 1235), Cuicateco terrane (Pérez‐Gutiérrez, Solari, Gómez‐Tuena, & Valencia, , n = 239), Mexican Volcanic Belt and EAP (Cantagrel & Robin, , n = 11; Ferrari et al, , n = 45; Nelson & González‐Caver, , n = 15) (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

et al. 2018

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The bulk sand samples and detrital zircons collected from the Atasta and Alvarado beach areas in the southwestern Gulf of Mexico have been analysed for geochemistry and U–Pb ages to constrain their provenance. The index of chemical maturity and SiO2/Al2O3 ratio of the Atasta and Alvarado beach sands indicated low compositional maturity. The chondrite‐normalized REE patterns and Eu anomalies of the Atasta and Alvarado beach sands suggested that the sands were derived from felsic and intermediate igneous rock types, respectively. A wide range in Th and U contents of the Atasta (~1.0–884 ppm and ~39–883 ppm, respectively) and Alvarado (~13–2,641 ppm and ~21–2,457 ppm, respectively) zircons likely indicates that the detrital zircon populations consist of zircons derived from multiple sources. The total rare earth element (ΣREE) content in the Atasta and Alvarado zircons ranges from ~151 to 2,088 ppm and ~154 to 3,580 ppm, respectively. The chondrite‐normalized REE patterns of zircons from the two beach areas show slightly depleted light REE (LREE) and enriched heavy REE (HREE), as well as positive Ce and negative Eu anomalies. A few zircons of Alvarado beach lack a Ce positive anomaly but exhibit a distinct Eu anomaly. The differences in REE patterns among zircons between the two beach areas revealed the variations in the type of source terranes, which supplied zircons to the beach areas. The detrital zircon age distribution for the Atasta beach is homogeneous, showing a prominent Proterozoic peak (~596–2,461 Ma; number of samples n = 62) with few Cenozoic (~10.43–65.2 Ma; n = 4) and Palaeozoic (~380–468 Ma; n = 5) zircons. The zircon U–Pb ages of Alvarado beach revealed Cenozoic (~0.25–63.9 Ma; n = 65), Mesozoic (~67.9–181.2 Ma), Palaeozoic (~252–297 Ma), and Proterozoic (~589–1,501 Ma) age clusters with predominant Cenozoic zircons. The comparison of zircon REE chemistry and geochronological data of this study with published data suggests that the source terranes, which supplied zircons to the Atasta beach, were the Chiapas Massif and Oaxacan complexes, whereas the zircons in the Alvarado beach were derived from the nearby Mexican Volcanic Belt and Eastern Alkaline Province. The provenance variation between the two beach areas was also revealed by the dissimilarities in zircon age clusters.

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Section: Discussionmentioning

confidence: 99%

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

et al. 2018

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“…Tuning of the ICP-MS followed the parameters reported in Solari et al (2010) and Ortega-Obregón et al (2014). Corrected isotope ratios, ages and errors were calculated using Iolite software (Paton et al, 2011) and the VizualAge data reduction scheme of Petrus and Kamber (2012).…”

Section: La-icp-ms Technique (Lei)mentioning

confidence: 99%

Apatite U-Pb dating at UNAM laboratories: analytical protocols and examples of its application

Ortega‐Obregón¹,

Abdullin²,

Solari³

et al. 2019

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Apatite is the most common phosphate mineral in the Earth's crust and can be found in practically all magmatic and metamorphic rocks, as well as in ancient and recent sediments and in certain ore deposits. Its effective closure temperature of 450-550 °C for the U-Pb system makes apatite an important natural medium-temperature thermochronometer that can be dated by both laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and isotope dilution thermal ionization mass spectrometry (ID-TIMS) techniques. Due to its low U content, coupled with high Pb contents incorporated during crystallization (also called common lead), apatite U-Pb dating is analytically challenging, and requires robust analytical protocols to achieve reliable ages. In this experimental study we obtained apatite U-Pb ages from six rock samples employing LA-ICP-MS (at Laboratorio de Estudios Isotópicos, Centro de Geociencias, UNAM), while one sample was also dated by ID-TIMS (at Laboratorio Universitario de Geoquímica Isotópica, UNAM). These samples have igneous emplacement or metamorphic ages broadly ranging from the Neoproterozoic to the Paleocene. The obtained apatite U-Pb ages agree well with other radioisotopic data (U-Pb on zircon and K-Ar or Ar-Ar on micas and hornblende) available for the same rock samples tested, or for the same geological units studied. These apatite U-Pb results, obtained for the first time at two main Mexican geochronology laboratories, are precise enough to be geologically meaningful and usually represent the cooling ages; though, in some cases they may also indicate the crystallization or the metamorphic age. Some advantages and disadvantages of LA-ICP-MS-and ID-TIMS-based methodologies were observed and outlined. Our results validate the analytical procedures used and will serve as an important trigger towards the development or improvement of medium-temperature thermochronology techniques in Mexico.

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“…Las mediciones isotópicas de Lu-Hf en zircones (Matteini et al, 2010) se realizaron en el Laboratorio de Estudios Isotópicos (LEI) del Centro de Geociencias empleando un espectrómetro de masas multicolector con plasma acoplado por inducción (MC-ICP-MS) marca Thermo modelo Neptune Plus conectado al mismo láser descrito anteriormente para el estudio de U-Pb. La técnica analítica empleada para la obtención de datos de Hf es la detallada por Ortega-Obregón et al (2014) y los resultados analíticos de los zircones de la muestra de andesita se presentan en la Tabla 1.…”

Section: Paleomagnetismounclassified

“…Ortega -Obregón et al (2014) reportan análisis de isótopos de Hf en diferentes cuerpos ígneos del Paleozoico tardío que intrusionan los complejos metamórficos Oaxaqueño y Acatlán, en el sur de México. Para la mayoría de las muestras (Etla, Carbonera, Sosola y Zaniza), obtienen valores de épsilon Hf inicial en zircones mucho menores de 0 (entre -1 y -14) y edades modelo de Hf T DM2 C del Proterozoico entre 1330 a 2160 Ma, que evidencian el alto grado de contaminación cortical con basamento Mesoproterozoico del Complejo Oaxaqueño o similar (Figura 11).…”

Section: Basamento Del Subterreno Zihuatanejounclassified

“…Para la mayoría de las muestras (Etla, Carbonera, Sosola y Zaniza), obtienen valores de épsilon Hf inicial en zircones mucho menores de 0 (entre -1 y -14) y edades modelo de Hf T DM2 C del Proterozoico entre 1330 a 2160 Ma, que evidencian el alto grado de contaminación cortical con basamento Mesoproterozoico del Complejo Oaxaqueño o similar (Figura 11). Cabe destacar que Ortega-Obregón et al (2014) Tabla 2 (continuación). Datos Paleomagnéticos y parámetros estadísticos para los sitios de Bahía Chamela e Isla Cocinas.…”

Section: Basamento Del Subterreno Zihuatanejounclassified

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2019

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Permian–Carboniferous arc magmatism in southern Mexico: U–Pb dating, trace element and Hf isotopic evidence on zircons of earliest subduction beneath the western margin of Gondwana

Cited by 93 publications

References 59 publications

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

Apatite U-Pb dating at UNAM laboratories: analytical protocols and examples of its application

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