Evolutionary model for convergent margins facing large ocean basins: Mesozoic Baja California, Mexico

Busby, Cathy J.; Smith, Douglas P.; Morris, William; Fackler-Adams, Benjamin N.

doi:10.1130/0091-7613(1998)026<0227:emfcmf>2.3.co;2

Cited by 91 publications

(72 citation statements)

References 9 publications

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“…In contrast, typical forearc basin fills shoal upward into shallow marine and/or nonmarine strata, but are dominated by mainly deep marine strata (e.g., Dickinson, 1995;Busby et al, 1998;Takashima et al, 2004;Fildani et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Modification of Continental Forearc Basins by Flat‐Slab Subduction Processes: A Case Study from Southern Alaska

Ridgway

Trop

Finzel

2011

Tectonics of Sedimentary Basins

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Forearc basins are large sediment repositories that develop in the upper plate of convergent margins and are a direct response to subduction. These basins are part of the magmatic arc-forearc basin-accretionary prism "trinity" that defines the tectonic configuration of the upper plate along most subduction-related convergent margins. Many previous studies of forearc basins have explored the links between construction of magmatic arcs, exhumation of accretionary prisms, and sediment deposition in adjacent forearc basins. These studies provide an important framework for understanding firstorder tectonic processes recorded in forearc basins that are characterized by long-lived subduction of "normal" oceanic crust. Many convergent margins, however, are complicated by second-order subduction processes, such as flat-slab subduction of buoyant oceanic crust in the form of seamounts, spreading and aseismic ridges, and oceanic plateaus. These second-order processes can substantially modify the tectonic configuration of the upper plate both in time and space, and produce sedimentary basins that do not easily fit into the conventional magmatic arc-forearc basin-accretionary prism trinity.In this chapter, we discuss the modification of the southern Alaska forearc basin by Paleocene-Eocene subduction of a spreading ridge followed by OligoceneHolocene subduction of thick oceanic crust. This thick oceanic crust is currently being subducted beneath south-central Alaska and has an imaged maximum thickness of 30 km at the surface and 22 km at depth. Findings from southern Alaska suggest that forearc basins modified from flat-slab subduction processes may contain a sedimentary and volcanic stratigraphic record that differs substantially from typical forearc basins. Processes and sedimentary features that characterize modified forearc basins include the following: (1) flat-slab subduction of a buoyant, topographically elevated spreading ridge oriented subparallel to the margin prompts diachronous uplift of the forearc basin floor and exhumation of older marine forearc basin strata as the ridge is subducted. Passage of the spreading ridge leads to subsidence and renewed deposition of nonmarine sedimentary and volcanic strata that locally exceeds the thickness of the underlying marine strata. (2) Insertion of a slab window beneath the forearc basin during spreading ridge subduction produces local intrabasinal topographic highs with adjacent depocenters, as well as discrete volcanic centers within and adjacent to the forearc basin. (3) Flat-slab subduction of thick oceanic crust also results in surface uplift and exhumation of forearc basin sedimentary strata. However, the insertion of thick crust throughout the flat-slab region (i.e., lack of a slab window) inhibits subduction-related magmatism adjacent to the forearc basin. In the case of subduction of a >350-km-wide fragment of thick oceanic crust beneath south-central Alaska, exhumation of forearc basin strata located above the region of flat-slab subduction has prompted enhanced T...

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Section: Discussionmentioning

confidence: 99%

Modification of Continental Forearc Basins by Flat‐Slab Subduction Processes: A Case Study from Southern Alaska

Ridgway

Trop

Finzel

2011

Tectonics of Sedimentary Basins

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“…While our model adequately simulates effects for regional tilting and random intrusion, it requires modification to describe realistic tectonic environments within magmatic arcs where the interplay between faulting, erosion, topographic development, and sedimentation may be complex [Einsele, 1992;Busby et al, 1998]. Incorporation of these effects into the model could significantly affect the denudation histories we obtain.…”

Section: More Realistic Thermokinetic Models For Batholith Evolutionmentioning

confidence: 99%

A method for evaluating basement exhumation histories from closure age distributions of detrital minerals

Lovera¹,

Grove²,

Kimbrough³

et al. 1999

J. Geophys. Res.

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Abstract. We have developed a two-dimensional, thermokinetic model that predicts the closure age distributions of detrital minerals from pervasively intruded and differentially exhumed basement. Using this model, we outline a method to determine the denudation history of orogenic regions on the basis of closure age distributions in synorogenic to -1 postorogenic forearc strata. At relatively high mean denudation rates of 0.5 km m.y. sustained over millions of years, magmatic heating events have minimal influence upon the age distributions of detrital minerals such as K-feldspar that are moderately retentive of radiogenic Ar. At lower rates, however, the effects ofbatholith emplacement may be substantial. We have applied the approach to detrital K-feldspars from forearc strata derived from the deeply denuded Peninsular Ranges batholith (PRB). Agreement of the denudation history deduced from the detrital K-feldspar data with thermochronologic constraints from exposed PRB basement lead us to conclude that exhumation histories of magmatic arcs should be decipherable solely from closure age distributions of detrital minerals whose depositional age is known.

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“…This facies grades laterally to the south into a finegrained, deeper water, distal facies of grey, thin-bedded silty Copyright © Atlantic Geology, 2011 Fyffe et al -A review of Proterozoic to Early Paleozoic lithotectonic terranes … sandstone, siltstone, and shale. The northward increase in bed thickness and grain size of the volcaniclastic rocks suggests that the Carpenter Brook sequence was sourced from a submarine pyroclastic apron (see Busby 1998) deposited on the margin of a volcanic arc edifice, represented by the Lawson Brook Formation. The Carpenter Brook Formation is no younger than Late Cambrian, because it is cut by the highly deformed Cameron Road Granite, which yielded a U-Pb zircon date of 490 ± 2 Ma.…”

Section: Annidale Terranementioning

confidence: 99%

“…This separation could be explained by geodynamic processes related to asymmetric spreading in backarc basins, which can lead to the sequential generation of multiple arcs in relatively short periods of time (Busby 1998;Zagorevski et al 2010). The question then arises as to whether the Penobscot volcanic rocks of the Miramichi and Annidale terranes were both part of the same arc or represent two distinct arcs.…”

Section: Penobscot Orogenic Cyclementioning

confidence: 99%

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

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Geological relationships preserved in the New Brunswick segment of the Appalachian orogen are key to deciphering the complex tectonic events that occurred during the closing of the Paleozoic Iapetus Ocean. These events can be explained in terms of geodynamic interactions between eight lithotectonic terranes. The first, the Caledonia terrane, comprises Neoproterozoic volcanic arc sequences and comagmatic plutons considered to form part of the microcontinent of Avalonia. The seven other terranes are associated with the microcontinent of Ganderia and consist of (1) Brookville terrane-Mesoproterozoic to Neoproterozoic platformal carbonates and Neoproterozoic to Early Cambrian plutonic rocks, (2) New River terrane-Neoproterozoic volcanic arc sequences and comagmatic plutons overlain by a Cambrian Penobscot volcanic arc sequence, In New Brunswick, closure of the Iapetus Ocean is attributed to four major tectonic episodes: (1) the Penobscot orogeny, which accreted the Miramichi, Annidale, and St. Croix terranes to the New River terrane on the trailing edge of Ganderia by closing a Penobscot backarc basin in the Early Ordovician, (2) the Taconic orogeny, which accreted the Popelogan terrane on the leading edge of Ganderia to the Laurentian margin in the Late Ordovician and effectively closed the main tract of the Iapetus Ocean, (3) the Salinic orogeny, which accreted the Elmtree and Miramichi terranes to the Laurentian margin by closing the Tetagouche backarc basin in the Silurian, and (4) the Acadian orogeny, which accreted the Caledonia terrane (Avalonia) to the Brookville and New River terranes on the trailing edge of Ganderia in the latest Silurian to earliest Devonian and in the process closed the last remaining oceanic tract in the northeastern Appalachians. RÉSUMÉLes corrélations géologiques préservées dans la partie du Nouveau-Brunswick de l'orogène des Appalaches sont essentielles pour bien comprendre le déroulement des événements tectoniques complexes survenus au moment de la fermeture de l'océan Iapetus, pendant le Paléozoïque. Il est possible d'expliquer ces événements par des interactions géodynamiques entre huit terranes lithotectoniques. Le premier, soit le terrane calédonien, comprend des séquences d'arc volcanique et des plutons comagmatiques du Néoprotérozoïque dont on estime qu'ils faisaient partie du microcontinent Avalonia. Les sept autres terranes sont associés au microcontinent Ganderia et comprenaient les terranes que voici : (1)

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Evolutionary model for convergent margins facing large ocean basins: Mesozoic Baja California, Mexico

Cited by 91 publications

References 9 publications

Modification of Continental Forearc Basins by Flat‐Slab Subduction Processes: A Case Study from Southern Alaska

Modification of Continental Forearc Basins by Flat‐Slab Subduction Processes: A Case Study from Southern Alaska

A method for evaluating basement exhumation histories from closure age distributions of detrital minerals

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

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