Joint Geophysical‐Petrological Modeling on the Ivrea Geophysical Body Beneath Valsesia, Italy: Constraints on the Continental Lower Crust

2020 ◽  
Vol 21 (12) ◽  
Author(s):  
Mattia Pistone ◽  
Luca Ziberna ◽  
György Hetényi ◽  
Matteo Scarponi ◽  
Alberto Zanetti ◽  
...  
Keyword(s):  
Lower Crust ◽  
Continental Lower Crust

scholarly journals The Role of Lower Crustal Rheology in Lithospheric Delamination During Orogeny

2021 ◽  
Vol 9 ◽  
Author(s):  
Lin Chen
Keyword(s):  
Lower Crust ◽  
Numerical Models ◽  
The Tibetan Plateau ◽  
Mantle Lithosphere ◽  
Laboratory Studies ◽  
Surface Uplift ◽  
Continental Lower Crust ◽  
Lower Crustal ◽  
Flow Laws

The continental lower crust is an important composition- and strength-jump layer in the lithosphere. Laboratory studies show its strength varies greatly due to a wide variety of composition. How the lower crust rheology influences the collisional orogeny remains poorly understood. Here I investigate the role of the lower crust rheology in the evolution of an orogen subject to horizontal shortening using 2D numerical models. A range of lower crustal flow laws from laboratory studies are tested to examine their effects on the styles of the accommodation of convergence. Three distinct styles are observed: 1) downwelling and subsequent delamination of orogen lithosphere mantle as a coherent slab; 2) localized thickening of orogen lithosphere; and 3) underthrusting of peripheral strong lithospheres below the orogen. Delamination occurs only if the orogen lower crust rheology is represented by the weak end-member of flow laws. The delamination is followed by partial melting of the lower crust and punctuated surface uplift confined to the orogen central region. For a moderately or extremely strong orogen lower crust, topography highs only develop on both sides of the orogen. In the Tibetan plateau, the crust has been doubly thickened but the underlying mantle lithosphere is highly heterogeneous. I suggest that the subvertical high-velocity mantle structures, as observed in southern and western Tibet, may exemplify localized delamination of the mantle lithosphere due to rheological weakening of the Tibetan lower crust.

Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif

2020 ◽  
Vol 109 (4) ◽  
pp. 1295-1319 ◽  
Author(s):  
G. Ortolano ◽  
R. Visalli ◽  
E. Fazio ◽  
P. Fiannacca ◽  
G. Godard ◽  
...  
Keyword(s):  
Lower Crust ◽  
Metamorphic Evolution ◽  
Continental Lower Crust

scholarly journals Subhorizontal fabric in exhumed continental lower crust and implications for lower crustal flow: Athabasca granulite terrane, western Canadian Shield

Tectonics ◽  
2010 ◽  
Vol 29 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Gregory Dumond ◽  
Philippe Goncalves ◽  
Michael L. Williams ◽  
Michael J. Jercinovic
Keyword(s):  
Lower Crust ◽  
Canadian Shield ◽  
Continental Lower Crust ◽  
Lower Crustal Flow ◽  
Lower Crustal

Continental Lower Crust

2015 ◽  
Vol 43 (1) ◽  
pp. 167-205 ◽  
Author(s):  
Bradley R. Hacker ◽  
Peter B. Kelemen ◽  
Mark D. Behn
Keyword(s):  
Lower Crust ◽  
Continental Lower Crust

Downward rejuvenation of the continental lower crust beneath the southeastern North China Craton

2019 ◽  
Vol 750 ◽  
pp. 213-228 ◽  
Author(s):  
Xianquan Ping ◽  
Jianping Zheng ◽  
Qing Xiong ◽  
W.L. Griffin ◽  
Chunmei Yu ◽  
...  
Keyword(s):  
North China Craton ◽  
Lower Crust ◽  
North China ◽  
Continental Lower Crust
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