Thermal and redox state of the subcontinental lithospheric mantle of NE Spain from thermobarometric data on mantle xenoliths

2009 ◽  
Vol 100 (1) ◽  
pp. 81-106 ◽  
Author(s):  
Gumer Galán ◽  
V. Oliveras ◽  
B. A. Paterson
Keyword(s):  
Lithospheric Mantle ◽  
Redox State ◽  
Mantle Xenoliths ◽  
Subcontinental Lithospheric Mantle ◽  
Ne Spain

scholarly journals Redox state of southern Tibetan upper mantle and ultrapotassic magmas

Geology ◽  
2020 ◽  
Vol 48 (7) ◽  
pp. 733-736 ◽  
Author(s):  
Weikai Li ◽  
Zhiming Yang ◽  
Massimo Chiaradia ◽  
Yong Lai ◽  
Chao Yu ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Redox State ◽  
Volcanic Rocks ◽  
Mantle Xenoliths ◽  
Continental Plate ◽  
Cratonic Mantle ◽  
Tectonic Settings ◽  
Mantle Condition ◽  
Typical Range

Abstract The redox state of Earth’s upper mantle in several tectonic settings, such as cratonic mantle, oceanic mantle, and mantle wedges beneath magmatic arcs, has been well documented. In contrast, oxygen fugacity () data of upper mantle under orogens worldwide are rare, and the mechanism responsible for the mantle condition under orogens is not well constrained. In this study, we investigated the of mantle xenoliths derived from the southern Tibetan lithospheric mantle beneath the Himalayan orogen, and that of postcollisional ultrapotassic volcanic rocks hosting the xenoliths. The of mantle xenoliths ranges from ΔFMQ = +0.5 to +1.2 (where ΔFMQ is the deviation of log from the fayalite-magnetite-quartz buffer), indicating that the southern Tibetan lithospheric mantle is more oxidized than cratonic and oceanic mantle, and it falls within the typical range of mantle wedge values. Mineralogical evidence suggests that water-rich fluids and sediment melts liberated from both the subducting Neo-Tethyan oceanic slab and perhaps the Indian continental plate could have oxidized the southern Tibetan lithospheric mantle. The conditions of ultrapotassic magmas show a shift toward more oxidized conditions during ascent (from ΔFMQ = +0.8 to +3.0). Crustal evolution processes (e.g., fractionation) could influence magmatic , and thus the redox state of mantle-derived magma may not simply represent its mantle source.

scholarly journals Alkaline and Carbonate-rich Melt Metasomatism and Melting of Subcontinental Lithospheric Mantle: Evidence from Mantle Xenoliths, NE Bavaria, Bohemian Massif

2013 ◽  
Vol 54 (12) ◽  
pp. 2597-2633 ◽  
Author(s):  
LukአAckerman ◽  
Petr ŠpaČek ◽  
TomአMagna ◽  
JaromÍr Ulrych ◽  
Martin Svojtka ◽  
...  
Keyword(s):  
Bohemian Massif ◽  
Lithospheric Mantle ◽  
Mantle Xenoliths ◽  
Subcontinental Lithospheric Mantle

Redox state of subcontinental lithospheric mantle and relationships with metasomatism: insights from spinel peridotites from northern Victoria Land (Antarctica)

2012 ◽  
Vol 164 (6) ◽  
pp. 1053-1067 ◽  
Author(s):  
Cristina Perinelli ◽  
Giovanni B. Andreozzi ◽  
Aida M. Conte ◽  
Roberta Oberti ◽  
Pietro Armienti
Keyword(s):  
Lithospheric Mantle ◽  
Redox State ◽  
Subcontinental Lithospheric Mantle ◽  
Victoria Land
Sign in / Sign up

Export Citation Format

Share Document