Age and origin of earliest adakitic-like magmatism in Panama: Implications for the tectonic evolution of the Panamanian magmatic arc system

Lithos ◽  
2012 ◽  
Vol 142-143 ◽  
pp. 226-244 ◽  
Author(s):  
Scott A. Whattam ◽  
Camilo Montes ◽  
Rory R. McFadden ◽  
Agustin Cardona ◽  
Diego Ramirez ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Magmatic Arc

Overview of West Antarctic tectonic evolution from ~500 Ma to the present

2021 ◽  
Author(s):  
Tom Jordan ◽  
Teal Riley ◽  
Christine Siddoway
Keyword(s):  
Tectonic Evolution ◽  
Weddell Sea ◽  
East Antarctica ◽  
Rift System ◽  
West Antarctica ◽  
The West ◽  
Magmatic Arc ◽  
West Antarctic ◽  
The Pacific ◽  
Tectonically Active

<p>West Antarctica developed as the tectonically active margin separating East Antarctica and the Pacific Ocean for almost half a billion years. Its dynamic history of magmatism, continental growth and fragmentation are recorded in sparse outcrops, and revealed by regional geophysical patterns. Compared with East Antarctica, West Antarctica is younger, more tectonically active and has a lower average elevation. We identify three broad physiographic provinces within West Antarctica and present their overlapping and interconnected tectonic and geological history as a framework for future study: 1/ The Weddell Sea region, which lay furthest from the subducting margin, but was most impacted by the Jurassic initiation of Gondwana break-up. 2/ Marie Byrd Land and the West Antarctic rift system which developed as a broad Cretaceous to Cenozoic continental rift system, reworking a former convergent margin. 3/ The Antarctic Peninsula and Thurston Island which preserve an almost complete magmatic arc system. We conclude by briefly discussing the evolution of the West Antarctic system as a whole, and the key questions which need to be addressed in future. One such question is whether West Antarctica is best conceived as an accreted collection of rigid microcontinental blocks (as commonly depicted) or as a plastically deforming and constantly growing melange of continental fragments and juvenile magmatic regions. This distinction is fundamental to understanding the tectonic evolution of young continental lithosphere. Defining the underlying geological template of West Antarctica and constraining its linkages to the dynamics of the overlying ice sheet, which is vulnerable to change due to human activity, is of critical importance.</p>

Tectonic evolution of the Juvenile Tonian Serra da Prata magmatic arc in the Ribeira belt, SE Brazil: Implications for early west Gondwana amalgamation

2017 ◽  
Vol 302 ◽  
pp. 221-254 ◽  
Author(s):  
Caroline de Araujo Peixoto ◽  
Monica Heilbron ◽  
Diana Ragatky ◽  
Richard Armstrong ◽  
Elton Dantas ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Magmatic Arc ◽  
West Gondwana ◽  
Se Brazil

scholarly journals Supplemental Material: The Mesozoic magmatic, metamorphic, and tectonic evolution of the eastern Gangdese magmatic arc, southern Tibet

2021 ◽  
Author(s):  
Zeming Zhang
Keyword(s):  
Trace Element ◽  
Late Cretaceous ◽  
Tectonic Evolution ◽  
Chemical Compositions ◽  
Isotopic Data ◽  
Southern Tibet ◽  
Magmatic Arc ◽  
Magmatic Rocks

Table S1: Major features of the reported Jurassic magmatic rocks of the eastern Gangdese arc; Table S2: Zircon U-Pb dating and trace element (in ppm) data of the studied Jurassic magmatic rocks of the eastern Gangdese arc; Table S3: Zircon Hf isotopic data of the studied Jurassic magmatic rocks of the eastern Gangdese arc; Table S4: Whole-rock chemical compositions of the studied Jurassic magmatic rocks of the eastern Gangdese arc; Table S5: Whole-rock chemical compositions of the Mesozoic magmatic rocks of the eastern Gangdese arc; Table S6: Whole-rock SiO2 and Cu concentrations of the Late Cretaceous magmatic rocks of the eastern Gangdese arc.

scholarly journals The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach

2016 ◽  
Vol 46 (suppl 1) ◽  
pp. 67-82 ◽  
Author(s):  
Márcio Martins Pimentel
Keyword(s):  
Tectonic Evolution ◽  
Oceanic Lithosphere ◽  
Passive Margin ◽  
Magmatic Arc ◽  
Provenance Studies ◽  
Continental Arcs ◽  
Central Brazil ◽  
Tectonic Settings ◽  
Subduction Magmatism ◽  
Final Closure

ABSTRACT: The Brasília Belt is one of the most complete Neoproterozoic orogens in western Gondwana. Rapid progress on the understanding of the tectonic evolution of the belt was achieved due to new U-Pb data, combined with Sm-Nd and Lu-Hf analyses. The evolution of the Brasília orogen happened over a long period of time (900 - 600 Ma) involving subduction, magmatism and terrain accretion, as a result of the consumption of the Goiás oceanic lithosphere. Provenance studies, based on U-Pb zircon data, indicate that the sedimentary rock units record different tectonic settings and stages of the evolution of the orogen. The Paranoá and Canastra groups represent passive margin sequences derived from the erosion of the São Francisco Craton. The Araxá and Ibiá groups, however, have dominant Neoproterozoic detrital zircon populations, as young as 650 Ma, suggesting derivation from the Goiás Magmatic Arc. The Goiás Magmatic Arc represents a composite arc terrain, formed by the accretion of older (ca. 0.9 - 0.8 Ga) intraoceanic island arc(s), followed by more evolved continental arcs. It extends for several thousand kilometers, from SW Goiás, through NE Brazil and into Africa. Metamorphism took place between 650 - 630 Ma reflecting final closure of the Goiás Ocean and continental collision.

Accretion history of the Trans-Hudson Orogen in Manitoba and Saskatchewan from paleomagnetism

2005 ◽  
Vol 42 (4) ◽  
pp. 723-740 ◽  
Author(s):  
David TA Symons ◽  
Michael J Harris
Keyword(s):  
Tectonic Evolution ◽  
Polar Wander ◽  
Magmatic Arc ◽  
Apparent Polar Wander Path ◽  
History Of ◽  
Andean Type ◽  
Flin Flon ◽  
Lynn Lake ◽  
Continental Magmatic Arc ◽  
Initial Framework

Lithoprobe's sponsorship has led to the acquisition of paleomagnetic data from ~20 units throughout the Paleoproterozoic Trans-Hudson Orogen (THO) of Saskatchewan and Manitoba, essentially the first such data for the region. Discussed summarily in this paper, they provide an initial framework for the THO's tectonic evolution. They show that the Archean Hearne and Superior cratons were at subtropical and subpolar paleolatitudes, respectively, at ~1875 Ma, with the Lynn Lake – LaRonge arc midway between them in the Manikewan Ocean. By ~1855 Ma, this ocean was still ~5500 ± 700 km wide, and its seafloor was subducting northwestward under the Hearne craton and pericratonic Peter Lake domain margin with the coeval development of an Andean-type continental magmatic arc, the Wathaman–Chipewyan batholith. Between ~1855 and ~1810 Ma, coalescing apparent polar wander path (APWP) segments record closing of the ocean at a rate of ~12 cm/a, trapping and accreting the several separate intervening terranes (Flin Flon, Hanson Lake, Lynn Lake – LaRonge, Rottenstone, and presumably also other THO terranes). From ~1815 to ~1775 Ma, the assembled terranes drifted as a coherent craton, yielding a stillstand and hairpin in the APWP.

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