Effects of a warmer mantle on the characteristics of Archean passive margins

2008 ◽  
pp. 149-156 ◽  
Author(s):  
Andrew Hynes
Keyword(s):  
Passive Margins

scholarly journals Melt volume at Atlantic volcanic rifted margins controlled by depth-dependent extension and mantle temperature

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Gang Lu ◽  
Ritske S. Huismans
Keyword(s):  
Numerical Models ◽  
Potential Temperature ◽  
Analytical Prediction ◽  
Natural Systems ◽  
Passive Margins ◽  
Margin Width ◽  
Rifted Margins ◽  
Mantle Potential Temperature ◽  
Mantle Temperature ◽  
Rifted Margin

AbstractBreakup volcanism along rifted passive margins is highly variable in time and space. The factors controlling magmatic activity during continental rifting and breakup are not resolved and controversial. Here we use numerical models to investigate melt generation at rifted margins with contrasting rifting styles corresponding to those observed in natural systems. Our results demonstrate a surprising correlation of enhanced magmatism with margin width. This relationship is explained by depth-dependent extension, during which the lithospheric mantle ruptures earlier than the crust, and is confirmed by a semi-analytical prediction of melt volume over margin width. The results presented here show that the effect of increased mantle temperature at wide volcanic margins is likely over-estimated, and demonstrate that the large volumes of magmatism at volcanic rifted margin can be explained by depth-dependent extension and very moderate excess mantle potential temperature in the order of 50–80 °C, significantly smaller than previously suggested.

3D crustal-scale structure of the West Iberia margin: a novel approach to integrated structural characterization of passive margins

2021 ◽  
Vol 42 (2) ◽  
Author(s):  
Cristina Granado ◽  
Alfonso Muñoz-Martín ◽  
Antonio J. Olaiz ◽  
Oscar Fernández ◽  
María Druet
Keyword(s):  
Structural Characterization ◽  
Scale Structure ◽  
The West ◽  
Passive Margins ◽  
Novel Approach

scholarly journals Structure and evolution of the Atlantic passive margins: A review of existing rifting models from wide-angle seismic data and kinematic reconstruction

2021 ◽  
Vol 126 ◽  
pp. 104898
Author(s):  
Youssef Biari ◽  
Frauke Klingelhoefer ◽  
Dieter Franke ◽  
Thomas Funck ◽  
Lies Loncke ◽  
...  
Keyword(s):  
Seismic Data ◽  
Wide Angle ◽  
Passive Margins

Types of Coal-Bearing Basin and Tectonic Unit in the Northwest Coal Hosting Area

2015 ◽  
Vol 1092-1093 ◽  
pp. 1497-1500
Author(s):  
Li Min Chen ◽  
Hao Xu ◽  
You Fei Li
Keyword(s):  
Strike Slip ◽  
Upper Triassic ◽  
Tectonic Unit ◽  
Tectonic Movement ◽  
Coal Basin ◽  
Passive Margins ◽  
Sedimentary Deposits ◽  
Coal Accumulation ◽  
Occurrence Characteristics ◽  
Tectonic Framework

Coal is typical of sedimentary deposits, Occurrence in a coal basin. The original nearly horizontal continuous coal seam was divided into different size; different depth containing coal segment by late tectonic movement, but its scope is not affected by today's "basin" restrictions. With the concept of coal occurrence tectonic unit to reflect the current Coal Occurrence Characteristics and build a prototype coal basin types that prototype into a coal basin tectonic movement after the formation of today's coal occurrence tectonic unit. In Northwest coal hosting area, the main coal bearing strata include Carboniferous-Permian, Upper Triassic, Lower-Middle Jurassic and Lower Cretaceous, and its distribution is regular; the center and strength of coal accumulation were variation in different coal-forming period; the types of basin are multiple, including Passive Margins, Peripheral Foreland, Intracontinental Rift, Intermontane, Strike-slip pull-apart, Strike-slip pull-apart, Inter-montane; moreover, one belt and two rings constitute the tectonic framework of Northwest coal hosting area.

scholarly journals 3D reconstruction of syn-tectonic strata in a salt-related orogen: learnings from the Llert syncline (South-central Pyrenees)

2020 ◽  
Vol 18 ◽  
pp. 1-19
Author(s):  
Adrià Ramos ◽  
Berta Lopez-Mir ◽  
Elisabeth P. Wilson ◽  
Pablo Granado ◽  
Josep Anton Muñoz
Keyword(s):  
3D Reconstruction ◽  
Field Research ◽  
Rift System ◽  
Passive Margins ◽  
Fold System ◽  
The North ◽  
Structural Framework ◽  
South Central ◽  
Insight Into ◽  
Central Pyrenees

The Llert syncline is located in the South-central Pyrenees, between the eastern termination of the EW-trending Cotiella Basin and the north-western limb of the NS-trending Turbón-Serrado fold system. The Cotiella Basin is an inverted upper Coniacian-lower Santonian salt-floored post-rift extensional basin developed along the northern Iberian rift system. The Turbón-Serrado fold system consists of upper Santonian – Maastrichtian contractional salt-cored anticlines developed along an inverted transfer zone of the Pyrenean rift system. Based on field research, this paper presents a 3D reconstruction of the Llert syncline in order to further constrain the transition between these oblique salt-related structures. Our results suggest that the evolution of the Llert syncline was mainly controlled by tectonic shortening related to the tectonic inversion of the Cotiella Basin synchronously to the growth of the Turbón-Serrado detachment anticline, and by the pre-compressional structural framework of the Pyrenean rift system. Our contribution provides new insight into the geometric and kinematic relationships of structures developed during the inversion of passive margins involving salt.

scholarly journals EVIDENCE OF MANTLE INHERITANCE ON THE ULTRA-DISTAL WESTERN IBERIAN MARGIN FROM TRANSFORMED TOTAL MAGNETIC ANOMALY

2018 ◽  
Vol 36 (3) ◽  
pp. 1 ◽  
Author(s):  
Luizemara Soares Alves Szameitat ◽  
Francisco José Fonseca Ferreira ◽  
Gianreto Manatschal ◽  
Monica da Costa Pereira Lavalle Helbron
Keyword(s):  
Steady State ◽  
Magnetic Anomaly ◽  
Oceanic Crust ◽  
Oceanic Lithosphere ◽  
Magnetic Data ◽  
Continental Lithosphere ◽  
Flow Lines ◽  
Passive Margins ◽  
Magnetic Features ◽  
Iberian Margin

ABSTRACT. Inheritance on continental lithosphere is considered as an important aspect on passive margins, since they may control magmatic budget and strain evolution during rifting and lithospheric breakup. On the distal Western Iberian margin, the transition to a steady state oceanic crust was little sampled and less investigated, in comparison to the more proximal parts near to the continental edge. In this work, we use marine magnetic data to analyze some aspects of the transition between the zone of exhumed continental mantle (ZECM) and the unequivocal oceanic crust, using transformed magnetic data. We observe that the end of the ZECM presents some straight magnetic features, especially at the eastern limit of the J anomaly. These magnetic lineaments are consistent with Early Cretaceous flow lines of the Iberian Plate. Straight structures are not expected in a newly formed oceanic lithosphere. Instead, it seems to be controlled by mantle inheritance. These straight magnetic features may indicate basement inheritance controlling magmatic insertions at the beginning of the oceanic crust formation.Keywords: Iberia, Magnetometry, Ocean-Continent Transition, Inherited Structures, Magma-Poor Margin. RESUMO. Estruturas herdadas na litosfera continental são um aspecto importante em margens passivas, pois poderão condicionar a entrada de magma e a evolução da deformação durante o rifteamento e quebra litosférica. Na porção distal da Margem Ibérica Ocidental, a transição da crosta continental até a crosta oceânica bem estabelecida possui menos dados e é menos investigada em comparação com a porção junto do limite de crosta continental. Neste trabalho, usamos dados magnéticos marinhos para analisar alguns aspectos entre a zona de exumação mantélica e a crosta oceânica inequívoca, através de dados magnéticos transformados. Observa-se que o final da zona de exumação mantélica apresenta algumas feições retilíneas, especialmente no limite leste da Anomalia J. Estes lineamentos magnéticos estão em conformidade com linhas de fluxo mesozoicas da Placa Ibérica. Feições retilíneas não são esperadas em uma litosfera oceânica neoformada. Ao contrário, estas aparentam ser um controle dado por estruturas pretéritas do manto. Portanto, estas feições magnéticas retilíneas sugerem uma herança do embasamento continental controlando as intrusões magmáticas no início da formação da crosta oceânica.Palavras-chave: Ibéria, Magnetometria, Transição Continente-Oceano, Estruturas Herdadas, Margem Pobre em Magma. 

scholarly journals Influence of magma-poor versus magma-rich passive margins on subduction initiation

2021 ◽  
Author(s):  
A. Auzemery ◽  
P. Yamato ◽  
T. Duretz ◽  
E. Willingshofer ◽  
L. Matenco ◽  
...  
Keyword(s):  
Subduction Initiation ◽  
Passive Margins
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