Oceanic island basalts in ophiolitic mélanges of the Central China Orogen: An overview

2017 ◽  
Vol 52 ◽  
pp. 155-173 ◽  
Author(s):  
Gaoxue Yang ◽  
Yongjun Li ◽  
Lili Tong ◽  
Zuopeng Wang ◽  
Le Wu
Keyword(s):  
Oceanic Island ◽  
Central China ◽  
Oceanic Island Basalts

Oceanic Island Basalts

2016 ◽  
pp. 1-5 ◽  
Author(s):  
Matthew Gerard Jackson
Keyword(s):  
Oceanic Island ◽  
Oceanic Island Basalts

Frequency spectrum of the electrical properties of seawater-saturated ocean crust and oceanic island basalts

1978 ◽  
Vol 15 (9) ◽  
pp. 1489-1495 ◽  
Author(s):  
M. J. Drury
Keyword(s):  
Electrical Properties ◽  
Frequency Spectrum ◽  
Conduction Mechanism ◽  
Oceanic Island ◽  
Pore Fluid ◽  
Membrane Polarization ◽  
Conduction Mechanisms ◽  
Metallic Mineral ◽  
Dominant Conduction Mechanism ◽  
Oceanic Island Basalts

The frequency spectrum of electrical properties of seawater-saturated oceanic crust and oceanic island basalts has been studied. All samples showed at least two of three possible polarization mechanisms: dielectric, membrane, and electrode. The membrane polarization appears to result from the presence of clay minerals, which frequently line or block pores and cracks in the samples. The dominant conduction mechanism in the samples is pore fluid (seawater) conduction, but the electrical properties of samples containing clay are modified by the clay. The results support the suggestion by Drury that a model of three conduction mechanisms acting approximately in parallel—pore fluid, clay mineral, and metallic mineral conduction—describes the electrical properties of seawater-saturated basalts.

Noble gas and nitrogen isotopic components in Oceanic Island Basalts

2009 ◽  
Vol 266 (1-2) ◽  
pp. 29-37 ◽  
Author(s):  
R.K. Mohapatra ◽  
D. Harrison ◽  
U. Ott ◽  
J.D. Gilmour ◽  
M. Trieloff
Keyword(s):  
Noble Gas ◽  
Oceanic Island ◽  
Oceanic Island Basalts

An overview of oceanic island basalts in accretionary complexes and seamounts accretion in the western Central Asian Orogenic Belt

2019 ◽  
Vol 179 ◽  
pp. 385-398 ◽  
Author(s):  
Gaoxue Yang ◽  
Yongjun Li ◽  
Lili Tong ◽  
Zuopeng Wang ◽  
Fenghao Duan ◽  
...  
Keyword(s):  
Oceanic Island ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Central Asian ◽  
Oceanic Island Basalts

Noble gases from oceanic island basalts do not require an undepleted mantle source

Nature ◽  
1985 ◽  
Vol 316 (6030) ◽  
pp. 716-718 ◽  
Author(s):  
David E. Fisher
Keyword(s):  
Mantle Source ◽  
Noble Gases ◽  
Oceanic Island ◽  
Oceanic Island Basalts

Constraints on genetic models for the Ballantrae complex, SW Scotland

1984 ◽  
Vol 75 (2) ◽  
pp. 189-191 ◽  
Author(s):  
P. Stone
Keyword(s):  
Continental Margin ◽  
Strike Slip ◽  
Oceanic Island ◽  
Island Arc ◽  
Genetic Models ◽  
Transform Zone ◽  
Oceanic Island Basalts

ABSTRACTThe distribution of Arenig graptolite faunas and zones of differing metamorphic fades help to establish a polyphase imbrication history for the complex. A further complication is introduced by the presence within the imbricate stack of lava sequences of comparable age but with contrasting geochemical signatures of island-arc and oceanic island basalts, and oceanic island sequences of markedly different Arenig ages. Strike-slip mechanisms appear the most likely means of introducing such a disparate assortment of elements into the Ballantrae complex and an origin in a continental margin transform zone is preferred.

Strontium Isotopes in some Seamount Basalts from the Northeastern Pacific Ocean

1973 ◽  
Vol 10 (10) ◽  
pp. 1479-1484 ◽  
Author(s):  
K. V. Subbarao ◽  
G. S. Clark ◽  
R. B. Forbes
Keyword(s):  
Chemical Composition ◽  
Pacific Ocean ◽  
Mantle Source ◽  
Strontium Isotopes ◽  
Oceanic Island ◽  
Lava Flows ◽  
Northeastern Pacific ◽  
Oceanic Island Basalts ◽  
Isotopic Variations ◽  
Source Materials

87Sr/86Sr ratios in seven seamount basalts from the northeastern Pacific Ocean range from 0.7022 to 0.7034 and correlate significantly with chemical composition as expressed by the ratio K2O/(K2O + Na2O). These basalts seem to be similar to oceanic island basalts in alkali element concentrations, 87Sr/86Sr and K2O/(K2O + Na2O) ratios suggesting similar mantle source materials, possibly least depleted in dispersed elements. However, in places, seamount basalts also appear to resemble ridge tholeiites. Large differences in 87Sr/86Sr and Rb/Sr ratios for the samples from the Cobb seamount appear to indicate isotopic variations in the source materials, perhaps resulting in the formation of different lava flows within the seamount.

Petrology of Basanitic Lavas of the Daur–Hentiyn Range (P–T Conditions of Formation, Crystallization Sequence, and Sources of Material)

2021 ◽  
Vol 62 (03) ◽  
pp. 291-305
Author(s):  
A.Ya. Medvedev ◽  
E.I. Demonterova ◽  
A.A. Karimov ◽  
V.A. Belyaev
Keyword(s):  
Electron Probe ◽  
Volcanic Rocks ◽  
Oceanic Island ◽  
Volcanic Area ◽  
Crystallization Sequence ◽  
Nd Isotope ◽  
Mineral Compositions ◽  
Oceanic Island Basalts ◽  
South Baikal ◽  
Comprehensive Study

Abstract —We performed a comprehensive study of basanites from the Daur–Hentiyn Range and present the first data on their Sr and Nd isotope and mineral compositions (electron probe microanalysis). The study has shown that the basanites are chemically similar to the volcanic rocks of the South Baikal volcanic area (SBVA) and are slightly different from oceanic island basalts in higher contents of Ba, Th, La, and Sr. The crystallization temperatures and pressures for the Fo0.85 olivine–melt equilibrium have been estimated, 1186–1137 ºC, 1.09–1.06 GPa, and the sequence of mineral crystallization has been established. The obtained Sr and Nd isotope data indicate that the basanitic magmas were generated from material with PREMA and EMI isotope parameters.

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