Isotopic and trace element compositions of upper mantle and lower crustal xenoliths, Cima volcanic field, California: Implications for evolution of the subcontinental lithospheric mantle

1997 ◽  
Vol 102 (B9) ◽  
pp. 20133-20148 ◽  
Author(s):  
Samuel B. Mukasa ◽  
Howard G. Wilshire
Keyword(s):  
Trace Element ◽  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Volcanic Field ◽  
Subcontinental Lithospheric Mantle ◽  
Crustal Xenoliths ◽  
Lower Crustal ◽  
Cima Volcanic Field

Petrology of Lower Crustal and Upper Mantle Xenoliths from the Cima Volcanic Field, California

1991 ◽  
Vol 32 (1) ◽  
pp. 169-200 ◽  
Author(s):  
H. G. WILSHIRE ◽  
A. V. McGUIRE ◽  
J. S. NOLLER ◽  
B. D. TURRIN
Keyword(s):  
Upper Mantle ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Lower Crustal ◽  
Cima Volcanic Field

Quaternary sodic and potassic intraplate volcanism in northeast China controlled by the underlying heterogeneous lithospheric structures

Geology ◽  
2021 ◽  
Author(s):  
Xingli Fan ◽  
Qi-Fu Chen ◽  
Yinshuang Ai ◽  
Ling Chen ◽  
Mingming Jiang ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Northeast China ◽  
Velocity Structure ◽  
Seismic Velocity ◽  
Subcontinental Lithospheric Mantle ◽  
Seismic Velocities ◽  
S Wave ◽  
Crust And Upper Mantle ◽  
Potassic Volcanism

The origin and mantle dynamics of the Quaternary intraplate sodic and potassic volcanism in northeast China have long been intensely debated. We present a high-resolution, three-dimensional (3-D) crust and upper-mantle S-wave velocity (Vs) model of northeast China by combining ambient noise and earthquake two-plane wave tomography based on unprecedented regional dense seismic arrays. Our seismic images highlight a strong correlation between the basalt geochemistry and upper-mantle seismic velocity structure: Sodic volcanoes are all characterized by prominent low seismic velocities in the uppermost mantle, while potassic volcanoes still possess a normal but thin upper-mantle “lid” depicted by high seismic velocities. Combined with previous petrological and geochemical research findings, we propose that the rarely erupted Quaternary potassic volcanism in northeast China results from the interaction between asthenospheric low-degree melts and the overlying subcontinental lithospheric mantle. In contrast, the more widespread Quaternary sodic volcanism in this region is predominantly sourced from the upwelling asthenosphere without significant overprinting from the subcontinental lithospheric mantle.

scholarly journals The petrogenesis of tholeiitic diabases in eastern Parnaíba Basin: evidence for geochemical heterogeneities in the subcontinental lithospheric mantle in NE Brazil

2017 ◽  
Vol 47 (1) ◽  
pp. 109-126 ◽  
Author(s):  
Adriano Guilherme da Silva ◽  
Cícera Neysi de Almeida ◽  
Sérgio de Castro Valente ◽  
Leonardo Fonseca Borghi de Almeida
Keyword(s):  
Trace Element ◽  
Fractional Crystallization ◽  
Lithospheric Mantle ◽  
Sedimentary Basin ◽  
Sedimentary Rocks ◽  
Geochemical Modelling ◽  
Subcontinental Lithospheric Mantle ◽  
Tectonic Events ◽  
Tholeiitic Magmatism ◽  
Parnaíba Basin

ABSTRACT: The sedimentary rocks within the Paleozoic Parnaiba basin in NE Brazil were intruded by voluminous tholeiitic diabase sills and covered by coeval basaltic flows. This paper presents lithogeochemical data of borehole samples obtained from wells located in the eastern portion of the Parnaiba basin. The diabases are subalkaline tholeiitc rocks comprising three high-TiO2 and three low-TiO2 suites that are unrelated by differentiation processes. Fractional crystallization of olivine and augite was the predominantly evolutionary processes within individual high- and low-TiO2 suites as depicted by trace element geochemical modelling, exception being made for one low-TiO2 suite that evolved by AFC. Parental compositions for both low- and high-TiO2 suites are related with variably enriched, spinel harzburgitic sources likely to represent the heterogeneous subcontinental lithospheric mantle underneath the sedimentary basin. The geochemical provinciality of the Parnaiba tholeiitic magmatism seems unrelated with the Transbrasiliano Lineament but may be due to lithospheric mantle amalgamation and remobilization occurred during previous tectonic events.

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