Lead isotope and trace element variation in Tenerife pumices: evidence for recycling within an ocean island volcano

1989 ◽  
Vol 53 (373) ◽  
pp. 519-525 ◽  
Author(s):  
J. A. Wolff ◽  
Z. A. Palacz
Keyword(s):  
Trace Element ◽  
Lead Isotope ◽  
Isotope Ratios ◽  
Volcanic Edifice ◽  
Sr Isotope ◽  
Isotopic Data ◽  
Pb Isotope ◽  
Pumice Fall ◽  
Element Variation ◽  
Fall Deposits

AbstractThree voluminous Quaternary phonolitic pumice fall deposits erupted from the compositionally-zoned Tenerife magma chamber exhibit variability in Sr and Pb isotope ratios. It has been previously argued that the Sr isotope variations are due to syn-eruptive interaction between magma and hydrothermal fluids (Palacz and Wolff, 1989). Pb compositions are not correlated with Sr, and are believed to reflect magmatic values. Pb isotope ratios exhibit regular variation with degree of fractionation, and one zoned deposit is heterogeneous in Pb. The highest values seem to characterize the most fractionated upper parts of the zoned system. This is unlikely to be a consequence of magmatic recharge. Isotopic and trace element behaviour is instead consistent with combined assimilation and fractional crystalliza- tion, involving the recycling of material containing relatively radiogenic Pb, from within the volcanic edifice. Assimilation of sediment intercalated within the submarine portion of the pile is ruled out by the isotopic data. The most probable contaminant is a felsic igneous rock. Early trachytes reported by Sun (1980) have the required Pb isotope compositions and may approximately represent the assimilant.

Interpretation of Pb isotope compositions of galenas from the Midland Valley of Scotland and adjacent regions

1984 ◽  
Vol 75 (2) ◽  
pp. 85-96 ◽  
Author(s):  
John Parnell ◽  
Ian Swainbank
Keyword(s):  
Lower Devonian ◽  
Lead Isotope ◽  
Sedimentary Rocks ◽  
Isotope Ratios ◽  
Igneous Rocks ◽  
Pb Isotope ◽  
Lower Carboniferous ◽  
Granite Magma ◽  
Lower Palaeozoic ◽  
Caledonian Granite

ABSTRACTThe lead isotope compositions of 61 galenas from central and southern Scotland vary markedly between different regions. Most galenas from the southern Grampian Highlands yield isotope ratios (206Pb/204Pb 17·77 ± 0·25, 207Pb/204Pb 15·47 ± 0·05, 208Pb/204Pb 37·63 ± 0·26) less radiogenic than those from Midland Valley galenas (18·22 ± 0·12, 15·55 ± 0·05, 38·13 ± 0·14) whilst galena lead from the Southern Uplands (18·28 ± 0·12, 15·56 ± 0·03, 38·21 ± 0·18) is more radiogenic than that from the southern Midland Valley (18·12 ± 0·06, 15·52 ± 0·02, 38·06 ±0·10). The change in isotopie composition across the Highland Boundary fault reflects the presence or absence of Dalradian rocks which included a magmatic component of lead. Galenas from the Dalradian sequence in Islay, where igneous rocks are lacking, have a composition (18·14±0·04, 15·51±0·01, 37·90±0·02) more like Midland Valley galenas. In the Southern Uplands, galenas yield lead isotope ratios similar to those of feldspars from Caledonian granite (18·30 ± 0·14, 15·57 ± 0·04, 37·96 ± 0·15) analysed by Blaxland et al. (1979). The similar ratios reflect the incorporation of Lower Palaeozoic sedimentary rocks into the granite magma, rather than a granitic source for the mineralisation. The granites were then thermal-structural foci for later mineralising fluids which leached metals from the surrounding rocks. Within the Midland Valley, galenas hosted in Lower Devonian-Lower Carboniferous lavas are notably more radiogenic (18·31 ±0·12, 15·58 ± 0·06, 38·20 ± 0·16) than sediment-hosted galenas (18·14 ± 0·07, 15·52 ± 0·02, 38·08 ± 0·10). The Devonian lavas at least may have inherited lead from subducted (? Lower Palaeozoic) rock incorporated in the primary magma.

Combined Sm-Nd and Rb-Sr isotope systematics in the Donegal granitoids and their petrogenetic implications

1990 ◽  
Vol 127 (1) ◽  
pp. 75-80 ◽  
Author(s):  
C. S. Dempsey ◽  
A. N. Halliday ◽  
I. G. Meighan
Keyword(s):  
Continental Crust ◽  
Isotope Ratios ◽  
Amphibolite Facies ◽  
Sr Isotope ◽  
Isotopic Data ◽  
Isotopic Compositions ◽  
Isotopic Variations ◽  
Isotope Systematics

AbstractThe metaluminous to peraluminous granitoids of the Donegal batholith, northwest Ireland, were emplaced at c. 400 Ma into greenschist-amphibolite facies metasediments of the Dalradian Supergroup. Sm-Nd and Rb-Sr isotopic data are provided for eleven granitoid samples from six of the plutons and one specimen from the northeast granodiorite pluton of the Newry complex, Co. Down; the Donegal results reveal essentially similar initial Sr isotope ratios (0.7051–0.7068) but highly variable initial eNd values, −1.2 to −8.3 (and −0.5 for Newry). Certain granitoids have distinctive Nd isotopic compositions characteristic of the involvement of old, LREE-enriched continental crust in some cases or young crust and/or mantle-derived magmas in others. The Nd and Sr isotopic variations can be explained by a variety of mixing hypotheses.

scholarly journals Moss Biomonitoring of Transboundary Pollutants in Japan’s Mountains

2021 ◽  
Author(s):  
Yoshitaka Oishi
Keyword(s):  
Trace Metal ◽  
Lead Isotope ◽  
Isotope Ratios ◽  
Atmospheric Pollutants ◽  
Pb Isotope ◽  
Mountain Ecosystems ◽  
Accurate Indication ◽  
Metal Contents ◽  
Moss Biomonitoring ◽  
High Lead

Abstract Long-range transported atmospheric pollutants (or transboundary pollutants) include trace metals with isotope ratios and compositions that vary from those of domestic pollutants, which threaten mountain ecosystems. These differences can be applied as indices (trace metal indices) to evaluate the influence of transboundary pollutants on mountain ecosystems. Mosses play important ecological functions in mountains and are sensitive to atmospheric deposition. Therefore, using these indices for moss biomonitoring can provide a more accurate indication of ecosystem health. However, few studies have examined which indices are appropriate for moss biomonitoring. In this study, the effectiveness of moss biomonitoring using trace metal indices was examined for evaluating transboundary pollutants in mountainous areas in Japan. Transboundary pollutants in these areas originate from mainland Asia and are characterized by high lead isotope ratios, lead to zinc (Pb/Zn) ratios, and arsenic to vanadium (As/V) ratios. Given that the abundance of transboundary pollutants decreases with distance from mainland Asia, moss isotope indices are also expected to vary with distance. Based on observations, Pb isotope ratios were found to decrease with distance from mainland Asia; in contrast, Pb/Zn and As/V ratios did not display any notable relationship with distance. These results are likely attributed to biological and environmental factors that affect trace metal contents in moss. Thus, moss Pb isotope ratios are useful indicators of transboundary pollutants in Japan’s mountains, offering an important tool for comparable moss biomonitoring studies in East Asia.

scholarly journals Determination of Lead Elemental Concentration and Isotopic Ratios in Coal Ash and Coal Fly Ash Reference Materials Using Isotope Dilution Thermal Ionization Mass Spectrometry

2019 ◽  
Vol 16 (23) ◽  
pp. 4772 ◽  
Author(s):  
Chaofeng Li ◽  
Huiqian Wu ◽  
Xuance Wang ◽  
Zhuyin Chu ◽  
Youlian Li ◽  
...  
Keyword(s):  
Lead Isotope ◽  
Thermal Ionization Mass Spectrometry ◽  
Environmental Science ◽  
Coal Fly Ash ◽  
Lead Isotopes ◽  
Coal Ash ◽  
Isotope Ratios ◽  
Ionization Mass ◽  
Pb Isotope ◽  
Lead Isotope Ratios

The rapid expansion of coal-fired power plants around the world has produced a huge volume of toxic elements associated with combustion residues such as coal fly ash (CFA) and coal ash (CA), which pose great threats to the global environment. It is therefore crucial for environmental science to monitor the migration and emission pathway of toxic elements such as CFA and CA. Lead isotopes have proved to be powerful tracers capable of dealing with this issue. Unfortunately, up to now, few high precision lead isotope data of CFA and CA certified reference materials (CRMs) determined by using the double spike technique have been reported. Hence, to facilitate the application of lead isotopes in environmental science, it is indispensable and urgent to determine a suite of high precision Pb isotope ratios and Pb elemental contents for CFA and CA CRMs. Here, we measured lead isotope ratios from four CFA and CA CRMs using thermal ionization mass spectrometry (TIMS) combined with the 204Pb–207Pb double spike method. Lead isotope ratios values of CRMs (GBW11124, GBW08401, GBW11125d, and JCFA-1) covered wide variation ranges from 17.993 to 19.228 for 206Pb/204Pb, from 15.513 to 15.675 for 207Pb/204Pb, and from 38.184 to 39.067 for 208Pb/204Pb. Lead isotope ratios of these CRMs, except for GBW11124, show good external reproducibility (2 RSD, n = 8), which is better than 0.05% for 206Pb/204Pb and 207Pb/204Pb, 0.07% for 208Pb/204Pb, 0.04% for 206Pb/207Pb, and 0.05% for 208Pb/206Pb. The Pb concentrations of these CRMs were determined using 207Pb single spike method. The reproducibility (1 RSD, n = 4) of Pb elemental content was <0.60%. This indicates the distribution of Pb elements in these CRMs is homogeneous. With the exception of GBW11124, the suite of CRMs can be used for determining CFA and CA matrix composition for quality control of Pb isotope analyses.

scholarly journals Optimisation of a current generation ICP-QMS and benchmarking against MC-ICP-MS spectrometry for the determination of lead isotope ratios in environmental samples

2018 ◽  
Vol 33 (12) ◽  
pp. 2184-2194 ◽  
Author(s):  
Abida Usman ◽  
E. Louise Ander ◽  
Elizabeth H. Bailey ◽  
Simon Nelms ◽  
Vanessa Pashley ◽  
...  
Keyword(s):  
Source Apportionment ◽  
Environmental Samples ◽  
Lead Isotope ◽  
Isotope Ratios ◽  
Fitness For Purpose ◽  
Pb Isotope ◽  
Current Generation ◽  
Icp Ms ◽  
A Current

Novel ANOVA methodology was used to benchmark ICP-QMS against MC-ICP-MS for Pb isotope ratios, demonstrating “fitness-for-purpose” in source apportionment.

scholarly journals Lead Isotope Analysis of Geological Native Copper: Implications for Archaeological Provenance Research in the North American Arctic and Subarctic

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 667
Author(s):  
H. Kory Cooper ◽  
Antonio Simonetti
Keyword(s):  
North America ◽  
North American ◽  
Lead Isotope ◽  
Isotope Analysis ◽  
Isotope Ratios ◽  
Pb Isotope ◽  
Native Copper ◽  
Lead Isotope Analysis ◽  
Innovation And Diffusion ◽  
Trade And Exchange

The Indigenous inhabitants of Arctic and Subarctic North America had been using native copper for several centuries prior to sustained interaction with Europeans beginning in the 18th century. The connection, if any, between the use of copper in these two adjacent regions is, at present, unclear. The ability to determine the source of native copper artifacts found in greater northwestern North America would inform on the movement of copper via trade and exchange between, and aid in understanding the innovation and diffusion of native copper metallurgy among, ancestral Dene and Inuit People. This paper provides the results of a Lead Isotope Analysis (LIA) pilot study examining Pb isotope ratios of native copper samples from multiple locations in the northern regions of North America. The results from this preliminary study indicate some overlap in Pb isotope ratios between Arctic and Subarctic sources of native copper, and these nonetheless record distinct isotope signatures relative to those associated with other North American native Cu deposits.

New lead isotope data on Cretaceous volcanic rocks of Mongolia: the sources and the origin of the magmatic melts

2021 ◽  
Author(s):  
Maksim Kuznetsov ◽  
Valery Savatenkov ◽  
Shpakovich Lidia ◽  
Kozlovskiy Alexander ◽  
Kudryashova Ekaterina
Keyword(s):  
Late Cretaceous ◽  
Lithospheric Mantle ◽  
Lead Isotope ◽  
Isotope Composition ◽  
Volcanic Rocks ◽  
Volcanic Area ◽  
Sr Isotope ◽  
Pb Isotope ◽  
Eastern Mongolia

&lt;p&gt;The Eastern Mongolia Volcanic Area (EMVA) and the Gobi-Altai Volcanic Area (GAVA) are large parts of the Late Mesozoic volcanic-plutonic belt which is located in northeast Asia. The main value of the EMVA and the GAVA was formed during the Cretaceous. Previous research devoted to Cretaceous volcanic rocks of both volcanic areas has focused mainly on its geochemical features of main and trace components, and Nd &amp;#8211; Sr isotope composition (Bars et al., 2018; Dash et al., 2015; Sheldrick et al., 2018; Sheldrick et al., 2020). At the same time, the published data on the Pb isotope composition of volcanic rocks of the EMVA and the GAVA is too scarce (Sheldrick et al., 2018; Sheldrick et al., 2020). However, the Pb isotope characteristic can be a key to the understanding of parent melts sources of the EMVA and the GAVA rocks.&amp;#160; Therefore, the goal of the presented work is a more extensive study of the Pb isotope systematics of the Cretaceous volcanic complexes within the EMVA and the GAVA.&lt;/p&gt;&lt;p&gt;Obtained data on Pb isotope characteristics of the EMVA volcanic rocks demonstrate the role of the upper crust terrigenous component (UCC) in magma generation. The role of the UCC in the EMVA formation is consistent with the Nd &amp;#8211; Sr isotope composition and elevated LILE contents in rock samples. In contrast to the EMVA the Pb isotope features of the same aged GAVA rocks (135 &amp;#8211; 120 Ma) with the enriched Nd &amp;#8211; Sr composition point to the role of the lower crust component in their formation. Thus, there is a difference between the sources of the coeval rocks of two volcanic areas reflecting the difference in the melts source composition between the two areas.&lt;/p&gt;&lt;p&gt;The Late Cretaceous rocks of the GAVA (about 90 Ma), as well as the Early Cretaceous rocks of the EMVA, lie nearby a field of lithospheric mantle xenoliths on the Pb isotope ratios diagram. In turn, the obtained Pb isotope data on the lherzolite xenoliths as well as that on paleooceanic complexes of Mongolia reveal the obvious difference of Pb isotope composition of the lithospheric mantle of the region from that of the Paleo-Asian ocean mantle. The observed difference can be explained by the metasomatic alteration of the suboceanic mantle during accretion and subduction processes before the EMVA and the GAVA formation. Thus, the conclusion about the key role of the metasomatized lithospheric mantle in the GAVA Late Cretaceous rocks formation can be made.&lt;/p&gt;&lt;p&gt;The study was supported by the RFBR (20-05-00401).&lt;/p&gt;&lt;p&gt;KEYWORDS: Eastern Mongolia, Gobi-Altai, Cretaceous volcanic rocks, lead isotope composition.&lt;/p&gt;

Bio-Monitoring using Lead Isotope Ratios in Seagrass and Oysters

2002 ◽  
Vol 36 (1) ◽  
pp. 52-54 ◽  
Author(s):  
Niels C. Munksgaard ◽  
Cristy M. Moir ◽  
David L. Parry
Keyword(s):  
Environmental Samples ◽  
Isotope Ratio ◽  
Lead Isotope ◽  
Lead Concentration ◽  
Cost Effective ◽  
Isotope Ratios ◽  
Monitoring Tool ◽  
Pb Isotope ◽  
Lead Isotope Ratios ◽  
Bio Monitoring

The combined measurement of lead concentration and isotope ratios in organisms used as bio-monitors may provide a sensitive and cost-effective monitoring tool allowing an unambiguous assessment of the source of lead in environmental samples. Data presented here shows that dispersion of trace amounts of orederived Pb produced distinctive Pb isotope ratio changes in seagrass and oysters acting as sentinel accumulators.

TRACING MOISTURE SOURCES OF THE EXTREME STORM EVENT IMPACTING THE CAROLINAS IN OCTOBER, 2015 USING O, H, AND SR ISOTOPE RATIOS

2016 ◽  
Author(s):  
Donna Surge ◽  
◽  
Karly R. Schmidt ◽  
Corey Moore ◽  
Drew S. Coleman ◽  
...  
Keyword(s):  
Isotope Ratios ◽  
Storm Event ◽  
Sr Isotope ◽  
Moisture Sources ◽  
Extreme Storm
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