Microcontinents and Continental Fragments Associated With Subduction Systems

  title={Microcontinents and Continental Fragments Associated With Subduction Systems},
  author={J. M. M. van den Broek and Carmen Gaina},
Microcontinents and continental fragments are small pieces of continental crust that are surrounded by oceanic lithosphere. Although classically associated with passive margin formation, here we present several preserved microcontinents and continental fragments associated with subduction systems. They are located in the Coral Sea, South China Sea, central Mediterranean and Scotia Sea regions, and a “proto‐microcontinent,” in the Gulf of California. Reviewing the tectonic history of each region… 

Pre-collisional extension of microcontinental terranes by a subduction pulley

Terrane accretion is a ubiquitous process of plate tectonics that delivers fragments of subduction-resistant lithosphere into a subduction zone, resulting in events such as ocean plateau docking or

The Louisiade ophiolite: A missing link in the western Pacific

Recent dredging of a 100 km long ridge along the northernmost part of the Louisiade Plateau (LP) recovered serpentinized peridotites, MORB (mid‐ocean‐ridge basalt) and volcaniclastic

Generation of Continental Lithospheric Mantle by Tectonic Isolation of Oceanic Plate

Continental formation models invoke subduction or plume‐related processes to create the buoyant, refractory character of continental lithospheric mantle (CLM). From similarities in melt depletion,

Geochemistry and geochronology of Pengco subduction‐related ophiolites, Tibet: Implications for Dongkaco microcontinent in the Bangong–Nujiang suture zone

The identification of a microcontinent in Bangong–Nujiang suture zone (BNSZ) is important to understanding the tectonic evolution of Bangong–Nujiang Tethys Ocean (BNTO). Subduction‐related ophiolite

Back‐Arc Dynamics Controlled by Slab Rollback and Tearing: A Reappraisal of Seafloor Spreading and Kinematic Evolution of the Eastern Algero‐Balearic Basin (Western Mediterranean) in the Middle‐Late Miocene

In spite of clear fan‐shaped magnetic anomalies in the Eastern Algero‐Balearic Basin (EABB), the way how and the time when seafloor spreading occurred are still debated. In this work, a new

Constant 12 and reflexivity 472319 hahslm on the geography of the earth in the economic era of covid

The purpose of this research is to analyze the geographical shape of the earth’s face with the 472319 Hahslm patterns in geomorphology. Earth undergoes the process of forming water and soil so that



The Formation of Continental Fragments in Subduction Settings: The Importance of Structural Inheritance and Subduction System Dynamics

Microcontinents and continental fragments are pieces of continental lithosphere, formed by extension and breakup, followed by plate boundary relocations. Microcontinents or continental fragments

A recipe for microcontinent formation

Accreted slivers of continental margins are common in the geologic record, but the processes that lead to their formation are poorly understood. We observe an association of plume-related

Formation of continental fragments: The Tamayo Bank, Gulf of California, Mexico

We present a model for microcontinent formation that is based on the structure of the Tamayo trough in the Gulf of California, Mexico. Potential field modeling of a transect through the Tamayo trough

Accretionary orogens through Earth history

Abstract Accretionary orogens form at intraoceanic and continental margin convergent plate boundaries. They include the supra-subduction zone forearc, magmatic arc and back-arc components.

Morphology, seismic structure and tectonic development of the Powell Basin, Antarctica

The Powell Basin, located near the Scotia-Antarctica strike-slip plate boundary, is bounded on three sides by continental crustal blocks, and it separates the South Orkney microcontinent from the

From microcontinents to extensional allochthons: witnesses of how continents rift and break apart?

ABSTRACT The conjunction of high-quality seismic surveys, deep sea drilling, and progress in numerical modelling has changed the way of thinking about how continents rift and oceans form. In

Insights from the Jan Mayen system in the Norwegian–Greenland sea—I. Mapping of a microcontinent

SUMMARY In this contribution, we present a model of microcontinent architecture within a system that involves a complex rifted margin setting and different phases of deformation and continental

Geodynamic models of terrane accretion: Testing the fate of island arcs, oceanic plateaus, and continental fragments in subduction zones

[1] Crustal growth at convergent margins can occur by the accretion of future allochthonous terranes (FATs), such as island arcs, oceanic plateaus, submarine ridges, and continental fragments. Using

Back arc extension, tectonic inheritance, and volcanism in the Ligurian Sea, Western Mediterranean

The Ligurian basin, western Mediterranean Sea, has opened from late Oligocene to early Miocene times, behind the Apulian subduction zone and partly within the western Alpine belt. We analyze the deep