Mantle sources and magma genesis of Late Cenozoic basalts in Weizhou Island, Guangxi, China

2020 ◽  
Vol 36 (7) ◽  
pp. 2092-2110
Author(s):  
YANG WenJian ◽  
◽  
YU HongMei ◽  
ZHAO Bo ◽  
CHEN ZhengQuan ◽  
...  
Keyword(s):  
Late Cenozoic ◽  
Magma Genesis ◽  
Mantle Sources

BASALTIC MAGMA GENESIS AND MANTLE SOURCES BENEATH TWO CENOZOIC VOLCANOES, MT. EARLY AND SHERIDAN BLUFF, EAST ANTARCTICA

2020 ◽  
Author(s):  
Yuyu Li ◽  
◽  
K.S. Panter ◽  
John L. Smellie ◽  
Jerzy S. Blusztajn ◽  
...  
Keyword(s):  
Basaltic Magma ◽  
East Antarctica ◽  
Magma Genesis ◽  
Mantle Sources

Geochemistry of Late Cenozoic basalts from the Crary Mountains: characterization of mantle sources in Marie Byrd Land, Antarctica

2000 ◽  
Vol 165 (3-4) ◽  
pp. 215-241 ◽  
Author(s):  
Kurt S Panter ◽  
Stanley R Hart ◽  
Philip Kyle ◽  
Jerzy Blusztanjn ◽  
Thom Wilch
Keyword(s):  
Late Cenozoic ◽  
Mantle Sources

Isotopic assessment of relative contributions from crust and mantle sources to the magma genesis of Precambrian granitoid rocks

1984 ◽  
Vol 310 (1514) ◽  
pp. 605-625 ◽  
Keyword(s):  
Calc Alkaline ◽  
Isotopic Data ◽  
Late Archaean ◽  
Magma Genesis ◽  
West Greenland ◽  
Sialic Crust ◽  
Mantle Sources ◽  
Granitoid Rocks ◽  
Plutonic Rocks ◽  
Source Materials

Rb-Sr, Sm-Nd and U-Th-Pb isotopic data for Precambrian granitoids (i.e. granites and intermediate calc-alkaline plutonic rocks) from Greenland, Scotland and Zimbabwe are used to assess the relative contributions to magma genesis of various source materials. Ancient continental crustal contributions are identified by negative e N d values in the magmas at time of formation. Initial 87 Sr/ 86 Sr (Sr 1 ,) values identify crustal contributions as derived from deep (low Rb/Sr) or upper (high Rb/Sr) crust. Pb isotopic data, expressed as model ( 238 U / 204 Pb) values, permit the distinction between deep (low U/Pb) and upper (high U/Pb) crustal contributions. However, it is not usually possible to distinguish between mantle (low Rb/Sr) and deep crustal sources using Sr 1 values. In contrast, Nd and Pb isotopic data permit such a distinction to be made. The granitoids isotopically analysed for the present study range from calc-alkaline types with mantle or mixed mantle-crust isotopic characteristics (for example, late Archaean orthogneisses from west Greenland) to true granites probably produced solely by anatexis of ancient sialic crust (for example, Badcall Quay red granite, northwest Scotland; Qorqut granite, west Greenland; Mont d’Or granite, Zimbabwe).

scholarly journals ROLE OF PYROXENITE MANTLE IN MAGMA GENESIS OF THE OLIGOCENE BASALTS FROM THE NORTHERN PART OF EAST SIKHOTE ALIN

2020 ◽  
Vol 39 (6) ◽  
pp. 82-97
Author(s):  
A.Yu. Martynov ◽  
◽  
Yu.A. Martynov ◽  
A.I. Malinovskii ◽  
◽  
...  
Keyword(s):  
Basaltic Magma ◽  
Volcanic Belt ◽  
Sikhote Alin ◽  
Late Cenozoic ◽  
Magma Genesis ◽  
First Order ◽  
Geodynamic Environment ◽  
Magma Sources ◽  
Magma Compositions

Identification of magma sources as well as its role in creating the diversity of magma compositions still remains one of the fundamental petrological problems. In our work, on the basis of new comprehensive isotope-geochemical and mineralogical data, we made an attempt to reconstruct the contribution of pyroxenite mantle source in the Oligocene basaltic magma genesis of the northern part of East Sikhote Alin volcanic belt. The most important indicators of this source are significant variations the first order transit elements ratios (Zn/Fe = 11–17, Zn/Mn = 6–10, Cr/Ni (1.8–6) and concentration of Ni (2000–3600 г/т) in olivine. LIL elements behavior suggests the presence of amphibole in pyroxenite substrate. The data obtained can be useful for the correct reconstruction of the magma generation and the geodynamic environment of this territory at the Late Cenozoic.

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