Intra-oceanic settings of the western Mexico Late Jurassic-Early Cretaceous arc sequences. Implications for the Pacific-Tethys geodynamic relationships during the Cretaceous

Tardy, Marc; Lapierre, Henriette; Bourdier, Jean-Louis; Couloni, Christian; Martinez‐Reyes, Juventino; Ortiz-Hernández, Luis Enrique; Yta, Miriam; Beck, Christian; Thery, J.-M.

doi:10.1080/09853111.1993.11105246

Cited by 10 publications

(27 citation statements)

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“…Although outcrops of several rocky-shore deposits are closely clustered, characteristics of the Alisitos Formation show that the coastal environment during the Early Cretaceous had little in common with later rocky shores. The difference was episodic influx of volcanic materials from the nearby Alisitos-Teloloapan arc (Tardy et al, 1993). Subsequent coastal evolution in the Eréndira region was quiescent in terms of volcanism compared with that of the early Cretaceous.…”

Section: Introductionmentioning

confidence: 97%

“…La Formación Alisitos del Cretácico temprano en el norte de Baja California, México, ya ha atraído antes la atención por sus extensos estratos volcaniclásticos (Tardy et al, 1993;Morán-Zenteno, 1994) y por sus masivas calizas fosilíferas (Allison, 1955;1974). Diferentes unidades de la Formación Alisitos, incluyendo flujos andesíticos ampliamente distribuidos, forman la parte principal de la sierra que se extiende a lo largo de la costa del Pacífico, entre Punta Banda cerca de Ensenada en el norte y Sierra Calamajué al sur (Wetmore et al, 2002).…”

Section: Introductionunclassified

“…The Lower Cretaceous Alisitos Formation of northern Baja California, México, has attracted prior attention for its extensive volcaniclastic strata (Tardy et al, 1993;Morán-Zenteno, 1994) and its massive fossil-bearing limestone (Allison, 1955;1974). Different units of the Alisitos Formation, including widespread andesitic flows, form the main part of the range that extends along the Pacific coast between Punta Banda near Ensenada in the north and Sierra Calamajui to the south (Wetmore et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Lower Cretaceous Alisitos Formation at Punta San Isidro: Coastal sedimentation and volcanism

Payne

Johnson

Vázquez³

2004

Cienc. Mar.

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The Lower Cretaceous (Aptian-Albian) Alisitos Formation is well exposed at Punta San Isidro and adjacent sea cliffs on the Pacific shores of Baja California near Eréndira, Mexico. Continuous coastal outcrops define a local stratigraphic succession less than 100 m in total thickness, including repetitious tuff, sandstone and conglomerate units interbedded with discontinuous limestone beds rarely more than 2.5 m thick. The limestone beds are biostromal units that include scattered oysters and/or corals, as well as units dominated by the rudistid bivalve, Caprinuloidea perfecta. Two distinctive conglomerate units are composed of andesite cobbles colonized by encrusting oysters in a quasi rocky-shore setting. One sandstone unit includes abundant fossil wood with tree limbs up to 55 cm long and 5 cm in diameter. Proximal volcanic activity is indicated by a series of dikes that cut through pyroclastic beds and lead to a 10-m thick andesitic flow that caps the succession at Punta San Isidro. Compared with thicker intervals of the Alisitos Formation elsewhere in Baja California that are dominated by andesitic flows and offshore limestone, the Punta San Isidro sequence offers a window on a back-reef environment adjacent to a paleoshore that received pyroclastic lahars from a terrestrial origin or mass flows from shallow submarine explosions. Recovery of marine life and the renewal of a carbonate substrate followed successive episodes of volcanism and massive erosion along an active coastline. This scenario is very different from depositional processes of the Upper Cretaceous (Campanian-Maastrichtian) Rosario Formation that cannibalized and subsequently formed a regional unconformity against tilted Alisitos strata with substantial topographic relief in the Eréndira region.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionunclassified

Section: Introductionmentioning

confidence: 99%

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Lower Cretaceous Alisitos Formation at Punta San Isidro: Coastal sedimentation and volcanism

Payne

Johnson

Vázquez³

2004

Cienc. Mar.

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“…The Sierra de Guanajuato is a NW-SE-oriented chain with elevations between 2000 and 2500 m. This range lies in the central segment of the Guerrero terrane constituted by arc and basin sequences, particularly the Mexican late Jurassic-early Cretaceous Alisitos-Teloloapan arc (Tardy et al, 1992). In the southwestern front tip of the Sierra de Guanajuato the Bajío fault, marks the northern boundary El Bajío depression (Aranda Gomez et al, 1989;Nieto-Samaniego, 1992;Botero-Santa et al, 2015).…”

Section: Geological Settingmentioning

confidence: 99%

Facies analysis, stratigraphic architecture and depositional environments of the Guanajuato conglomerate in the Sierra de Guanajuato, Mexico

Puy-Alquiza¹,

Miranda-Avilés²,

García-Barragán³

et al. 2017

BSGM

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“…The Alisitos Formation exposed between Ensenada and La Bocana along the Baja California Peninsula has attracted the attention of many researchers for its extensive volcaniclastic strata (Tardy et al, 1993;Morán-Zenteno, 1994) and thick fossiliferous limestones (Allison, 1955(Allison, , 1974. The marine sediments occur throughout the Alisitos Formation, however, the thicker sequences are found in the lower part (Wetmore et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

Rev. Mex. Cien. Geol.

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Petrography, stable carbon and oxygen isotopes, and major, trace, and rare earth elements geochemistry of limestones of the Alisitos Formation in the Los Torotes, Baja California were studied in order to document the elemental variations among Member C (MC) and Member E (ME) of the formation and to understand their diagenetic and depositional conditions. The major petrographic types identified are mudstone, wackestone and packstone. The limestones of the Alisitos Formation show significant variations in δ 13 C and δ 18O values (+4.13 to +5.26‰; -14.17 to -6.84‰; respectively). The limestones from Member C (MC) show higher ΣREE content (23 ± 17, n=10) than Member E (ME) (11 ± 5.5, n=9) of the Alisitos Formation. The observed variations in ΣREE content in these limestones are due to the amount of detrital material present in them. The limestones from ME record seawater-like REE+Y patterns, whereas the MC records non-seawater-like signatures (i.e. significant enrichment of middle rare earth elements: MREE). Most of the analyzed samples from the Alisitos Formation show negative Ce anomalies (Ce/Ce*: 0.67 -0.99, n=17). The limestones show both negative and positive Eu anomalies (Eu/Eu*: 0.58 -2.91, n=19). The positive Eu anomalies identified in many samples may be due to the influence of hydrothermal fluids or co-precipitation of hydrothermal Fe-sulfide. The limestones of ME exhibit seawater-like-REE patterns suggesting that most of the REEs present in them were derived from seawater. However, the limestones of MC were contaminated by detrital materials which effectively mask the seawater-like signatures. The detrital materials present in the limestones of MC were probably derived from the mafic to felsic source rocks.

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Intra-oceanic settings of the western Mexico Late Jurassic-Early Cretaceous arc sequences. Implications for the Pacific-Tethys geodynamic relationships during the Cretaceous

Cited by 10 publications

References 1 publication

Lower Cretaceous Alisitos Formation at Punta San Isidro: Coastal sedimentation and volcanism

Lower Cretaceous Alisitos Formation at Punta San Isidro: Coastal sedimentation and volcanism

Facies analysis, stratigraphic architecture and depositional environments of the Guanajuato conglomerate in the Sierra de Guanajuato, Mexico

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