Geochemistry, petrogenesis and structural setting of the meta-igneous Strathy Complex: a unique basement block within the Scottish Caledonides?

The Strathy Complex of the Scottish Caledonides is a bimodal association of amphibolites and siliceous grey gneisses that structurally underlies adjacent metasediments of the Moine Supergroup. Both rock units record a common polyphase Caledonian tectonometamorphic history. New elemental and radiogenic isotope data indicate that both end-members of the Strathy suite were derived from a depleted mantle source, that they are cogenetic and that they may have been related by crystal fractionation. δ18O values and their correlations with major and trace elements suggest that the protoliths were hydrothermally altered at temperatures below 200 °C. Tectonomagmatic discrimination based on relatively immobile elements and isotope systems, plus comparison with geochemically similar bimodal supracrustal associations elsewhere, strongly support the conclusion that the igneous protoliths of the Strathy Complex formed in an oceanic destructive margin setting. If TDM model ages of c. 1000 Ma approximate protolith crystallization, the Strathy Complex may have formed as juvenile crust in the peri-Rodinian ocean broadly contemporaneous with the Grenville orogenic cycle.

Download Full-text

Petrological characterization of the mantle source of Mediterranean lamproites: Indications from major and trace elements of phlogopite

Chemical Geology ◽

10.1016/j.chemgeo.2012.09.006 ◽

2013 ◽

Vol 353 ◽

pp. 267-279 ◽

Cited By ~ 40

Author(s):

Tobias Fritschle ◽

Dejan Prelević ◽

Stephen F. Foley ◽

Dorrit E. Jacob

Keyword(s):

Trace Elements ◽

Mantle Source ◽

Major And Trace Elements

Download Full-text

Mantle source characteristics of Triassic alkaline lavas within the Antalya Nappes, SW Turkey

10.5194/egusphere-egu2020-6775 ◽

2020 ◽

Author(s):

Ercan Aldanmaz ◽

Aykut Güçtekin ◽

Özlem Yıldız-Yüksekol

Keyword(s):

Trace Element ◽

Partial Melting ◽

Mantle Source ◽

Carbonate Platform ◽

Incompatible Trace Element ◽

Late Triassic ◽

Radiogenic Isotope ◽

Basaltic Rocks ◽

Sw Turkey ◽

End Members

The Late Triassic basaltic rocks that are dispersed as several lava sheets in a number of different tectonic slices within the Antalya nappes in SW Turkey represent the remnants of widespread oceanic magmatism with strong intra-plate geochemical signatures. The largest exposures are observed around the Antalya Bay, where pillow structured or massif lava flows are interlayered with Upper Triassic pelagic or carbonate platform sediments. Based on bulk-rock geochemical characteristics, the rocks mostly classify as alkaline basalts and display distinctive OIB-type trace element distributions characterized by significant enrichments in LILE and HFSE abundances, as well as LREE/HREE ratios, with respect to average N-MORB. Quantitative modeling of trace element data suggest that the primary melts that produced the alkaline lavas are largely the products of variable proportions of mixing between melts generated by variable, but generally low (<10) degrees of partial melting of more than one compositionally distinct mantle source. The samples, as a whole, display large variations in radiogenic isotope ratios with 87Sr/86Sr = 0.703021&#8211;0.70553, 143Nd/144Nd = 0.51247&#8211;0.51279, 206Pb/204Pb = 18.049&#8211;20.030, 207Pb/204Pb = 15.544&#8211;15.723 and 208Pb/204Pb = 38.546&#8211;39.530. Such variations in isotopic ratios correlate with the change in incompatible trace element relative abundances and reflect the involvement of a number of compositionally distinct mantle end-members. These include EMI and EMII type enriched mantle components both having lower 143Nd/144Nd than typical depleted MORB source with their contrasting low and high 206Pb/204Pb and 207Pb/204Pb ratios respectively, as well as a high time-integrated 238U/204Pb component with high 206Pb/204Pb at relatively low 87Sr/86Sr and &#949;Nd values. The results from trace element and radiogenic isotope data are consistent with the view that the initial melt generation was likely related to partial melting of the shallow convecting upper mantle in response to Triassic rifting events, while continued mantle upwelling resulted in progressively increased melting of mantle lithosphere that contained compositionally contrasting lithological domains with strong isotopic heterogeneities.

Download Full-text

Long-lasting influence of the Discovery plume on tholeiitic magmatism in the South Atlantic: data on basalts recovered by hole 513a, dsdp leg 71

Геохимия ◽

10.31857/s0016-7525642107-127 ◽

2019 ◽

Vol 64 (2) ◽

pp. 107-127

Author(s):

N. M. Sushchevskaya ◽

T. A. Shishkina ◽

M. V. Portnyagin ◽

V. G. Batanova ◽

B. V. Belyatsky

Keyword(s):

Trace Elements ◽

Mantle Peridotite ◽

Major And Trace Elements ◽

South Atlantic ◽

The South ◽

Incompatible Elements ◽

Depleted Mantle ◽

A Minor ◽

Lasting Influence ◽

Tholeiitic Magmatism

The paper presents the very first data on concentrations of major and trace elements; Sr, Nd, and Pb isotopic ratios of rocks; and the composition of olivine phenocrysts of 38-Ma basalts recovered by Hole 513a (DSDP Leg 71) in the South Atlantic. The bulk-rock samples and the chilled glasses are mildly magnesian (7–8 wt % MgO) and bear elevated FeO and low Na2O concentrations, as is typical of MORB of the TOR-1 type. Olivine phenocrysts (Fo84.5–88) in these rocks contain concentrations of trace elements (Ni, Mn, Cr, and Zn) that are typical of classic MORB, which are produced by partial melting mantle peridotite. The rocks are strongly depleted in incompatible elements [(La/Sm)n ~ 0.6] but have elevated Ba/Nb, K/Nb, and Pb/Ce ratios and Cu, Ag, and Au concentrations that are 1.5–4 times higher than in typical depleted MORB (N-MORB) and in most rift basalts in the South Atlantic. Isotope compositions of the basalts (average ratios 206Pb/204Pb ~ 18.0; 207Pb/204Pb ~ 15.6, 208Pb/204Pb ~ 38.0, 143Nd/144 Nd ~ 0.5130, and 87Sr/86Sr ~ 0.7040) are close to those in modern tholeiites from the southern MAR segment (SMAR) north of the Agulhas Fracture Zone. The data indicate that the magmas were derived from a strongly depleted mantle source that contained a minor (~3%) admixture of an enriched component, which is discernible in the magmas of the Discovery hotspot. The composition of the source, which is more depleted than DM, and the high degrees of melting of this source explain why the basalts from DSDP Hole 513a are enriched in chalcophile elements. It is believed that spreading magmatism at 45°–48° S in SMAR as far back as 40 Ma was already affected by the Discovery hotspot. This hotspot might be related to the Tristan plume system, and its origin and long-lasting influence on spreading magmatism in the South Atlantic are regarded as evidence of the extensive effect of the Tristan plume.

Download Full-text

Major and Trace Elements in the Humic Acid

10.26434/chemrxiv.7122413.v1 ◽

2018 ◽

Author(s):

Zoltán Kis ◽

Katalin Gméling ◽

Tímea Kocsis ◽

János Osán ◽

Mihály András Pocsai ◽

...

Keyword(s):

Trace Elements ◽

Humic Acid ◽

Activation Analysis ◽

Analytical Techniques ◽

Major And Trace Elements ◽

Prompt Gamma Activation Analysis ◽

Prompt Gamma ◽

Gamma Activation ◽

X Ray ◽

Precise Analysis

We present precise analysis of major and trace elements of the humic acid. We used three different element analytical techniques in our investigations as prompt-gamma activation analysis (PGAA), neutron activation analysis (NAA) and X-ray fluorescence (XRF) analysis was carried out. We identified 42 elements in our sample.

Download Full-text

A DEPLETED MANTLE SOURCE BELOW THE NORTHERN EXTENSION OF THE RIO GRANDE RIFT

10.1130/abs/2016rm-276269 ◽

2016 ◽

Author(s):

Cody L. MacCabe ◽

◽

Greg L. Melton ◽

Richard Wendlandt

Keyword(s):

Mantle Source ◽

Rio Grande ◽

Rio Grande Rift ◽

Depleted Mantle

Download Full-text

GEOCHEMICAL SIGNATURES OF PALEOZOIC SHALES FROM THE MIDLAND BASIN USING MAJOR AND TRACE ELEMENTS: INSIGHTS TO PROVENANCE AND POTENTIAL CRYSTALLINE SOURCE AREAS

10.1130/abs/2020sc-343866 ◽

2020 ◽

Author(s):

Hunter Green ◽

◽

Branimir Segvic

Keyword(s):

Trace Elements ◽

Major And Trace Elements ◽

Midland Basin ◽

Source Areas

Download Full-text

Determination of Some Major and Trace Elements in Cladodes of Barbary fig (Opuntia ficus-indica Mill.) by X-ray Fluorescence Spectrometry

Biological Trace Element Research ◽

10.1007/s12011-020-02555-4 ◽

2021 ◽

Author(s):

Bouzid Nedjimi

Keyword(s):

Trace Elements ◽

Major And Trace Elements ◽

Fluorescence Spectrometry ◽

Opuntia Ficus Indica ◽

X Ray

Download Full-text

A review of major and trace elements in Nile River and Western Red Sea sediments: An approach of geochemistry, pollution, and associated hazards

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2021.109595 ◽

2021 ◽

Vol 170 ◽

pp. 109595

Author(s):

Wael M. Badawy ◽

Octavian G. Duliu ◽

Hussein El Samman ◽

Atef El-Taher ◽

Marina V. Frontasyeva

Keyword(s):

Trace Elements ◽

Red Sea ◽

Major And Trace Elements ◽

Nile River

Download Full-text

Extreme isotopic heterogeneity in Samoan clinopyroxenes constrains sediment recycling

Nature Communications ◽

10.1038/s41467-021-21416-9 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jenna V. Adams ◽

Matthew G. Jackson ◽

Frank J. Spera ◽

Allison A. Price ◽

Benjamin L. Byerly ◽

...

Keyword(s):

Mantle Source ◽

Magma Mixing ◽

Major And Trace Elements ◽

Mantle Heterogeneity ◽

Isotopic Data ◽

Nd Isotopes ◽

Isotopic Heterogeneity ◽

Total Variability ◽

High Silica ◽

Insight Into

AbstractLavas erupted at hotspot volcanoes provide evidence of mantle heterogeneity. Samoan Island lavas with high 87Sr/86Sr (>0.706) typify a mantle source incorporating ancient subducted sediments. To further characterize this source, we target a single high 87Sr/86Sr lava from Savai’i Island, Samoa for detailed analyses of 87Sr/86Sr and 143Nd/144Nd isotopes and major and trace elements on individual magmatic clinopyroxenes. We show the clinopyroxenes exhibit a remarkable range of 87Sr/86Sr—including the highest observed in an oceanic hotspot lava—encompassing ~30% of the oceanic mantle’s total variability. These new isotopic data, data from other Samoan lavas, and magma mixing calculations are consistent with clinopyroxene 87Sr/86Sr variability resulting from magma mixing between a high silica, high 87Sr/86Sr (up to 0.7316) magma, and a low silica, low 87Sr/86Sr magma. Results provide insight into the composition of magmas derived from a sediment-infiltrated mantle source and document the fate of sediment recycled into Earth’s mantle.

Download Full-text