R. Torres de Leon

Universidad Nacional Autónoma de México

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Luigi Solari

Universidad Nacional Autónoma de México

Mariano Elı́as-Herrera

Universidad Nacional Autónoma de México

M. Chiquín

University of San Carlos of Guatemala

Fernando Ortega‐Gutiérrez

Universidad Nacional Autónoma de México

Carlos Ortega‐Obregón

Universidad Nacional Autónoma de México

Peter Schaaf

Universidad Nacional Autónoma de México

S. Morán ical

University of San Carlos of Guatemala

Jesús Solé

Universidad Nacional Autónoma de México

M. D. Norman

Australian National University

J. Duncan Keppie

Universidad Nacional Autónoma de México

Cooperative Institutions

Universidad Nacional Autónoma de México

University of San Carlos of Guatemala

Autonomous University of Queretaro

Nagoya University

Universidad Autónoma de la Ciudad de México

United States Geological Survey

Instituto de Geociencias

Stanford University

Mexican Academy of Sciences

National Institute of Anthropology and History

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U-Pb zircon geochronology of Paleozoic units in Western and Central Guatemala: insights into the tectonic evolution of Middle America

AGU Spring Meeting Abstracts (2007)

Luigi Solari Fernando Ortega‐Gutiérrez Mariano Elías‐Herrera Peter Schaaf M. D. Norman

Geochronology

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Caracterización geológica de los ensambles metamórficos de Taxco y Taxco el Viejo, Guerrero, México

Boletín de la Sociedad Geológica Mexicana (2012)

María Fernanda Campa Uranga R. Torres de Leon Alexander Iriondo Wayne R. Premo

ResumenTrabajos como el presentado en este artículo, que incluyen estudios básicos de cartografía, microtectónica, petrografía, geoquímica y geocronología de rocas de arco, permitirán iniciar una revisión geológica individual y colectiva de los arcos volcánicos que afloran en gran parte del territorio de México.La combinación de este tipo de esfuerzos permitirá proponer modelos de evolución geológica más precisos y menos especulativos para este importante proceso de generación de corteza mediante la acreción de arcos volcánicos (p.ej.terreno Guerrero).La geoquímica y petrología de las rocas metavolcaniclásticas (filitas), metalavas y metaignimbritas de Taxco y Taxco Viejo son muy similares y, en conjunto, permiten proponer un origen equivalente para su formación que, seguramente, está asociado a un ambiente de formación de tipo arco volcánico.En este estudio se describe por primera vez que la Roca Verde Taxco Viejo es, en realidad, una metaignimbrita.La deformación estudiada (macro-y microtectónica) de las rocas metavolcánicas de Taxco y Taxco Viejo es muy similar independientemente de la naturaleza del protolito.Estas rocas presentan planos de foliación muy bien desarrollados en conjunto que buzan tanto al E-NE como hacia el W-SW, lo cual sugiere la existencia de más de un evento de deformación regional.En este estudio proponemos que las edades 206 Pb/ 238 U obtenidas a partir del

10.18268/bsgm2012v64n3a8

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The Maya-Chortís Boundary: A Tectonostratigraphic Approach

International Geology Review (2007)

Fernando Ortega‐Gutiérrez Luigi Solari Carlos Ortega‐Obregón Mariano Elías‐Herrera Uwe Martens

This work presents an updated revision of the complex stratigraphic and tectonic relationships that characterize the geologic boundary between the Chortís and Maya continental blocks of the Caribbean region. Based on field, petrologic, structural and geochronological work in key areas of central Guatemala, as well as analysis of the relevant literature, we propose a new tectonostratigraphic structure that more fully appraises the fundamental tectonic role played by major faults that cut across the continental isthmus between the Americas, and bound separate tectonostratigraphic terranes (or fault blocks according to author JDK). Accordingly, we subdivide the area into seven of these units, from south to north: Chortís, Yoro, Sula, El Tambor, Jacalteco, Achí, and Maya, bounded respectively by the Agúan-La Ceiba, Jocotán-Chamelecón, Motagua, Baja Verapaz (defined in this work), and Chixoy-Polochic fault zones. Unfortunately, the extreme paucity of modern geologic data bearing on the pre-Cretaceous cover and basement units in the entire region constitutes a major obstacle for building convincing paleogeographic models to explain the complex tectonic evolution of the area from Precambrian to Cenozoic time. Consequently, this work should be taken as an attempt line to understand more clearly the nature and contact relationships between deep crustal blocks in nuclear Central America, and as a contribution to interpret their geologic evolution in plate tectonic terms.

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Geologic time scale

10.2747/0020-6814.49.11.996

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U-Pb zircon geochronology of Palaeozoic units in Western and Central Guatemala: insights into the tectonic evolution of Middle America

Geological Society London Special Publications (2009)

Luigi Solari Fernando Ortega‐Gutiérrez Mariano Elías‐Herrera Peter Schaaf M. D. Norman

Abstract Precambrian and Palaeozoic basements are present in southern Mexico and Central America, where several crustal blocks are recognized by their different geological record, and juxtaposed along lateral faults. Pre-Mesozoic reconstructions must take into account the nature of such crustal blocks, their geological history, age and petrology. Some of those crustal blocks are currently located between southernmost north America (the Maya Block) and Central America (Chortís Block).To better understand the geology of these crustal blocks, and to establish comparisons between their geological history, we performed U–Pb dating of both igneous and metasedimentary key units cropping out in central and western Guatemala. In the Altos Cuchumatanes (Maya Block) granites yield both Permian (269±29 Ma) and Early Devonian (391±7.4 Ma) U–Pb ages. LA-ICPMS detrital zircon ages from rocks of the San Gabriel sequence, interpreted as the oldest metasedimentary unit of the Maya Block, and overlain by the Late Palaeozoic Upper Santa Rosa Group, yield Precambrian detrital zircons bracketed between c . 920 and c . 1000 Ma. The presence of these metasedimentary units, as well as Early Devonian to Silurian granites in the Mayan continental margin, from west (Altos Cuchumatanes), to east (Maya Mountains of Belize) indicates a more or less continuous belt of Lower Palaeozoic igneous activity, also suggesting that the continental margin of the Maya Block can be extended south of the Polochic fault, up to the Baja Verapaz shear zone. A metasedimentary sample belonging to the Chuacús Complex yielded detrital zircons with ages between c . 440 and c . 1325 Ma. The younger ages are similar to the igneous ages reported from the entire southern Maya continental margin, and show proximity of the Complex in the Middle-Late Palaeozoic. The S. Diego Phyllite, which overlies high-grade basement units of the Chortís Block, contains zircons that are Lower Cambrian ( c . 538 Ma), Mesoproterozoic ( c . 980 to c . 1150 Ma) and even Palaeoproterozoic ( c . 1820 Ma). Absence of younger igneous zircons in the San Diego Phyllite indicates that either its sedimentation took place in a close range of time, during the Late Cambrian, or absence of connection between Chortís and Maya Blocks during the Early–Mid-Palaeozoic. The Precambrian zircons could have come from southern Mexico (Oaxaca and Guichicovi Complexes), or from Mesoproterozoic Massifs exposed in Laurentia and Gondwana. Palaeogeographic models for Middle America are limited to post-Jurassic time. The data presented here shed light on Palaeozoic and, possibly, Precambrian relationships. They indicate that Maya and the Chortís did not interact directly until the Mesozoic or Cenozoic, as they approached their current position.

Geochronology

10.1144/sp328.12

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Geochronology, structural evolution of the Tierra Colorada area, and tectonic implications for southern Mexico and Chortís block connections

AGU Spring Meeting Abstracts (2006)

Luigi Solari R. Torres de Leon G. Hernandez Pineda Jesús Solé Gabriela Solís Pichardo

Geochronology

Tierra

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Metamorphic evolution of lawsonite eclogites from the southern Motagua fault zone, Guatemala: insights from phase equilibria and Raman spectroscopy

Journal of Metamorphic Geology (2011)

S. Endo Simon Wallis Motohiro Tsuboi R. Torres de Leon Luigi Solari

Abstract Lawsonite eclogite (metabasalt and metadolerite) and associated metasedimentary rocks in a serpentinite mélange from an area just south of the Motagua fault zone (SMFZ), Guatemala, represent excellent natural records of the forearc slab–mantle interface. Pseudosection modelling of pristine lawsonite eclogite reproduces the observed predominant mineral assemblages, and garnet compositional isopleths intersect within the phase fields, yielding a prograde P – T path that evolves from 20 kbar, 470 °C (M1) to 25 kbar, 520 °C (M2). The dominant penetrative foliation within the eclogite blocks is defined by minerals developed during the prograde evolution, and the associated deformation, therefore, took place during subduction. Thermometry using Raman spectra of carbonaceous material in metasedimentary rocks associated with the SMFZ eclogites gives estimates of peak‐ T of ∼520 °C. Barometry using Raman spectroscopy shows unfractured quartz inclusions in garnet rims retain overpressures of up to ∼10 kbar, implying these inclusions were trapped at conditions just below the quartz/coesite transition, in agreement with the results of phase equilibrium analysis. Additional growth of Ca‐rich garnet indicates initial isothermal decompression to 20 kbar (M3) followed by hydration and substantial cooling to the lawsonite–blueschist facies (M4). Further decompression of the hydrated eclogite blocks to the pumpellyite–actinolite facies (3–5 kbar, 230–250 °C) is associated with dehydration and veining (M5). The presence of eclogite as m‐ to 10 m‐sized blocks in a serpentinite matrix, lack of widespread deformation developed during exhumation and derived prograde P – T path associated with substantial dehydration of metabasites within the antigorite stability field suggest that the SMFZ eclogites represent the uppermost part of the forearc slab crust sampled by an ascending serpentinite diapir in an active, moderate‐ T subduction zone.

Lawsonite

Blueschist

Omphacite

Coesite

Glaucophane

10.1111/j.1525-1314.2011.00960.x

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Tectonic Significance of Cretaceous to Tertiary Magmatic and Structural Evolution of the Northern Portion of the Xolapa Complex, Tierra Colorada-Acapulco Area, Southern Mexico

AGU Spring Meeting Abstracts (2007)

R. Torres de Leon Rubén Pérez Luigi Solari G. Hernández Jesús Solé

Tierra

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