Fig 7 - uploaded by Atomic Spectroscopy
Content may be subject to copyright.
Source publication
Reference materials (RMs) are the foundation in isotopic analysis, and the assignment of reference values of isotope ratios in RMs is a complex process. In this study, we established new isotopic reference values and its uncertainties for the Sr, Nd, Hf and Pb isotope ratios in 18 commonly used pure materials and rock RMs, and for Hf and O isotope...
Contexts in source publication
Context 1
... the Pb isotope system, the Pb isotopic compositions in NIST 981 obtained by TIMS and MC-ICP-MS show large variations (Fig. 7). This phenomenon cannot be explained by the heterogeneous Pb isotopic composition in NIST 981. The main reason could be that the Pb isotopic analysis methods used in many laboratories may not be mature, especially for the isotopic fractionation correction and the control of potential Pb contamination. Nevertheless, the robust ...
Context 2
... the Pb isotope system, the Pb isotopic compositions in NIST 981 obtained by TIMS and MC-ICP-MS show large variations (Fig. 7). This phenomenon cannot be explained by the heterogeneous Pb isotopic composition in NIST 981. The main reason could be that the Pb isotopic analysis methods used in many laboratories may not be mature, especially for the isotopic fractionation correction and the control of potential Pb contamination. Nevertheless, the robust ...
Similar publications
Fe, Ca, and Mg isotopes have been applied to Apollo and Luna samples in order to explore the origin and evolution of the Moon. In most previous studies, only one specific element was separated and measured for its isotope compositions, thereby consuming different splits of samples. Considering the rarity and preciousness of lunar samples, herein we...
This article presents A Matching Algorithm for Lead Isotope Analyses (AMALIA) that yields analytical coincidences in lead isotope databases, allowing a fast selection of potential candidates for metal provenance. As a proof of concept, potential ore sources for 29 Roman lead artifacts from the archaeological site of Fuente Spitz (Jaén, Spain) are p...
In this study, data from thirteen laboratories from around the world are presented for a successful certification of uranium isotope ratios in uranium ore concentrate certified reference materials from the National Research Council Canada. Different mass spectrometric measurement principles (including SF‐ICP‐MS, quadrupole ICP‐MS, TIMS, MC‐ICP‐MS,...
In terms of isotopic technologies, it is essential to be able to produce materials with an enriched isotopic abundance (i.e., a compound isotopic labelled with 2 H, 13 C, 6 Li, 18 O or 37 Cl), which is one that differs from natural abundance. The isotopic-labelled compounds can be used to study different natural processes (like compounds labelled w...
Continental weathering, an important geological process that affects the formation and evolution of the earth, involves the interaction of matter and energy among the lithosphere, atmosphere, hydrosphere, and biosphere. Stable Sr isotope (δ88/86Sr) is a novel non-traditional stable isotope. It has been widely discussed in tracing continental weathe...
Citations
... Whole-rock Sr-Nd isotope compositions of eclogite samples (D208-b1, D208-b2, 1540-b2 and 1618-DB2) were determined using a Neptune Plus MC-ICP-MS on class 100 workbenches in the laboratory at the Wuhan Sample Solution Analytical Technology Co., Ltd., Wuhan, China. The monitored material BCR-2 yielded results of 87 Sr/ 86 Sr = 0.704911 ± 8 (2SD) and 143 Nd/ 144 Nd = 0.512 640 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.705012 ± 20; 143 Nd/ 144 Nd = 0.512626 ± 8) within error (Zhang and Hu, 2020). The monitored material AGV-2 yielded results of 87 Sr/ 86 Sr = 0.703973 ± 7 (2SD) and 143 Nd/ 144 Nd = 0.512 804 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.703988 ± 13; 143 Nd/ 144 Nd = 0.512787 ± 7) within error (Zhang and Hu, 2020). ...
... The monitored material BCR-2 yielded results of 87 Sr/ 86 Sr = 0.704911 ± 8 (2SD) and 143 Nd/ 144 Nd = 0.512 640 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.705012 ± 20; 143 Nd/ 144 Nd = 0.512626 ± 8) within error (Zhang and Hu, 2020). The monitored material AGV-2 yielded results of 87 Sr/ 86 Sr = 0.703973 ± 7 (2SD) and 143 Nd/ 144 Nd = 0.512 804 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.703988 ± 13; 143 Nd/ 144 Nd = 0.512787 ± 7) within error (Zhang and Hu, 2020). ...
Unraveling the protolith origin of high-pressure and low-temperature (HP-LT) metamorphic rocks is the key to understanding the tectonic evolution of active continental margins. A comprehensive study, including field observations, geochemical analyses and zircon U-Pb geochronological dating, was conducted on the Lanling HP-LT terrane to determine its protolith origin and the presubduction paleogeography of the Paleo-Tethys Ocean. The metabasites can be divided into two geochemical groups: Group A samples exhibit low TiO2 values (1.15–1.81 wt%) and subalkaline basalt affinity with rare earth element (REE) distribution patterns and trace element abundances similar to enriched mid-ocean ridge basalts (EMORB); Group B samples have higher TiO2 values (2.75–3.32 wt%) and show alkaline basalt affinity and ocean island basalt (OIB) geochemical signatures. Lanling metabasites are likely derived from a long-depleted mantle source combined with crustal contamination based on the following evidence: (1) positive eNd(t) values (+4.8 to +5.6) and a scattered distribution of Isr(t) values (0.704684 to 0.710999), (2)
abundant Precambrian zircon grains, and (3) a volcanic arc trend in the tectonic discrimination diagram. Zircon U–Pb dating yields a timing of ca. 272–241 Ma for the protolith age of the Lanling eclogites. The protoliths of the OIB- and E-MORB-type metabasites in Lanling are postulated to be ocean island magmatites and basaltic crust of the Paleo-Tethys Ocean, respectively. Moreover, the Lanling quartzose
schists contain only ancient detrital zircons with ages of >500 Ma and show protolith lithostratigraphy and provenance similar to those of the late Paleozoic clastic flysch in the South Qiangtang block (SQB).
Based on the above observations and other geological evidence, a hypothetical model of the Permian–
Triassic ocean island and adjacent abyssal submarine fan in the Paleo-Tethys Ocean is proposed to
explain the protolith origin of the Lanling HP-LT terrane and the presubduction paleogeography in central
Qiangtang.
... In order to ensure the reliability of the analysis data, three international zircon standards of Plešovice, 91,500 and GJ-1 are analyzed simultaneously with the actual samples. The Hf isotope compositions of Plešovice, 91,500 and GJ-1 are 0.282478 ± 0.000008, 0.282300 ± 0.000011 and 0.282009 ± 0.000010, respectively [39]. ...
The petrogenesis of high Ba-Sr granitoids provide a great significance to penetrate the Proto-Tethys evolution in the North Qilian orogenic belt. This paper presents a combination of zircon U-Pb age, whole-rock major and trace element concentrations, and Sr-Nd-Hf isotopic data for Caowa high Ba-Sr dioritic intrusion from the eastern part of the North Qilian orogenic belt, aiming to decipher its petrogenesis and tectonic setting. LA-ICP-MS zircon U-Pb dating yields an emplacement age of 447±3 Ma for the Caowa intrusion, indicating a magmatic activity of the late Ordovician. The Caowa quartz diorites contain moderate contents of SiO2, MgO, Mg# and resultant high concentrations of Na2O+K2O, Fe2O3T and Al2O3, displaying calc-alkaline and metaluminous characteristics. Their relatively elevated Ba (up to 1165 ppm) and Sr (561 to 646 ppm) contents, with obvious enrichment in LILEs (e.g. Ba、Th、U) and depletion in HFSEs (e.g. Nb、Ta、Ti) resemble those of typical high Ba-Sr granitoids in subduction zone. Together with enriched Sr-Nd isotopic compositons[(87Sr/86Sr)i=0.7082−0.7086, εNd(t)= -5.1 to -4.9], and relatively extensive εHf(t) values (-13.2 to +8.5) of zircons, it suggests that these high Ba-Sr quartz diorites were derived from a mixture magma source between the ancient crust materials and the enriched lithospheric mantle metasomatised by fluid was released from subducted oceanic crust or sediment. Taking into account the ophiolites, high pressure metamorphic rocks and arc magmatic rocks in the region, we infer that affected by the northward subduction of the Qilian Proto-Tethys ocean, the Laohushan oceanic crust of the North Qilian back-arc basin was subducted during the Late Ordovician and resulted in extensive metasomatism of lithospheric mantle by fluids derived from oceanic crust or sediments, and the Caowa high Ba-Sr quartz diorites generated in the process of crust-mantle interaction during the Late Ordovician.
... Whole-rock Sr-Nd isotope compositions of eclogite samples (D208-b1, D208-b2, 1540-b2 and 1618-DB2) were determined using a Neptune Plus MC-ICP-MS on class 100 workbenches in the laboratory at the Wuhan Sample Solution Analytical Technology Co., Ltd., Wuhan, China. The monitored material BCR-2 yielded results of 87 Sr/ 86 Sr = 0.704911 ± 8 (2SD) and 143 Nd/ 144 Nd = 0.512 640 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.705012 ± 20; 143 Nd/ 144 Nd = 0.512626 ± 8) within error (Zhang and Hu, 2020). The monitored material AGV-2 yielded results of 87 Sr/ 86 Sr = 0.703973 ± 7 (2SD) and 143 Nd/ 144 Nd = 0.512 804 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.703988 ± 13; 143 Nd/ 144 Nd = 0.512787 ± 7) within error (Zhang and Hu, 2020). ...
... The monitored material BCR-2 yielded results of 87 Sr/ 86 Sr = 0.704911 ± 8 (2SD) and 143 Nd/ 144 Nd = 0.512 640 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.705012 ± 20; 143 Nd/ 144 Nd = 0.512626 ± 8) within error (Zhang and Hu, 2020). The monitored material AGV-2 yielded results of 87 Sr/ 86 Sr = 0.703973 ± 7 (2SD) and 143 Nd/ 144 Nd = 0.512 804 ± 5 (2SD), which are consistent with their recommended values ( 87 Sr/ 86 Sr = 0.703988 ± 13; 143 Nd/ 144 Nd = 0.512787 ± 7) within error (Zhang and Hu, 2020). ...
... At the same time, to monitor the test data of the high Yb/Hf ratio zircon, the internationally used high Yb/Hf ratio standard sample Temora 2 is used to monitor the test data of the high Yb/Hf ratio zircon. The Hf isotopic compositions of Plešovice, 91500, and GJ-1 have been reported by Zhang and Hu (2020). ...
The Xikuangshan and Woxi Sb-(Au-W) deposits are the most important Sb-related mineralization in the Xiangzhong metallogenic province, South China. In this study, trace element, U-Pb dating, and Hf isotopic results of zircon in typical ore samples from the Xikuangshan and Woxi deposits provide new insights into metal/fluid sources and mineralization processes. The zircons in different samples from the Xikuangshan deposit have a similar distribution of zircon U-Pb ages with two major groups: 400–500 Ma and 700–900 Ma, which are consistent with those from their host rocks (Devonian strata) and underlying basement rocks (Lengjiaxi and Banxi Groups). By comparison, the zircons from the Woxi deposit have younger U-Pb ages which are the same as contemporaneous magmatism in South China. The 176Hf/177Hf ratios, εHf(t), and TDM1 further proved an original relationship between the younger zircons (with ages < 500 Ma) and magmatism. The systematic trend in the size and roundness of zircons captured from basement rocks for Xikuangshan might be resulting from gravity separation in the sedimentary process which required a stable and long-lasting mineralization process. On the other hand, the homogenous size and roundness of zircons from the Woxi deposit, regardless of zircon ages and sampling locations, might have been caused by a relatively short and intense mineralization process. The differences in the mineralization process for the two deposits lead to different alteration degrees of zircons and are reflected by the variable concentrations of Y, Hf, Pb, and Th, as well as rare earth elements. In the deposit scale, some samples are considered to be altered at high grade and represent the main mineralization stages for the Xikuangshan and Woxi deposits, as their zircons have variable concentrations of trace and rare earth elements. Combined with previous studies, the sources of zircons and mineralizing material are distinct for the Xikuangshan and Woxi deposits: originated from basement rocks (Xikuangshan deposit) and magmatism (Woxi deposit). In addition, stable and long-lasting deep-circulated meteoric water is considered the mineralizing fluid for the Xikuangshan deposit, whereas the mineralizing fluid for the Woxi deposit might be related to magmatism. This research highlights the use of zircon geochronology and geochemistry in revealing the genesis of Sb deposits, making this method applicable worldwide to similar vein-type mineralization.
... In TIMS test results, the 143 Nd/ 144 Nd test value of international standard sample BCR-2 was 0.512623 ± 0.000011 (2SD, n = 7). The test results of all international standard samples were consistent with the recommended values of Zhang and Hu (2020). ...
... Three international zircon standards of Plešovice, 91500, and GJ-1 are analyzed simultaneously with the actual samples. The Hf isotopic compositions of Plešovice, 91500, and GJ-1 have been reported by Zhang et al. (2020). The external precision (2σ) of Plešovice, 91500, and GJ-1 is better than 0.000020. ...
The Early Mesozoic tectonic transition from the Paleo-Tethys tectonic regime to Paleo-Pacific tectonic regimes in the South China Block has long been debated.
Geochronology and geochemistry were carried out for the Early Mesozoic granitoids in the eastern Hunan Province to investigate their petrogenesis and the associated tectonic transition of the South China Block. Geochronology and petrography show that these plutons developed in two phases: 1) Late Triassic monzongranites, and 2) Late Jurassic alkali-granites. The monzogranites are characteristics by decrease in P2O5 contents when SiO2 contents increasing, low A/CNK index, belonging to I-type granites. They have negative εNd(t) and εHf (t) values with old two-stage crustal Nd-Hf isotopic model ages, together with the high zircon saturation temperatures and geochemical features, indicating a Mesoproterozoic crustal metabasite sources. The alkaligranites are characteristic by high A/CNK values, and Fe# index, and low Al2O3 and CaO contents, which belong to A-type granites. They have negative εNd (t) and εHf (t) values with old two-stage crustal Nd-Hf isotopic model ages, together with the low zircon saturation temperatures and geochemical features, indicating a Neoproterozoic crustal metasedimentary sources. Combined with previous results, we suggest that the Late Triassic monzogranites formed in syn-collision environment that
related to the collision of continents in the Palaeo-Tethys oceans, whereas the Late Jurassic alkali-granites formed in post-orogenic environment that resulted from the break-off/roll-back of the Palaeo-Pacific Plate. The tectonic transition from the Paleo-Tethys tectonic regime to the Paleo-Pacific tectonic regime in the South China Block occurred between the Late Triassic and Early Jurassic.
... Sr -Nd isotope analysis adopts MC-ICP-MS (Neptune Plus) of Thermo Fisher Scientific, Germany. The analytical value of 87 Sr/ 86 Sr and 143 Nd/ 144 Nd for monitoring standard sample BCR-2 is 0.704991 ± 6 (2SD) and 0.512647 ± 10 (2SD), respectively, which is consistent with the recommended value within the error range (Zhang and Hu, 2020). ...
... The analysed 87 Sr/ 86 Sr of NBS 987 standard solution is 0.710242 ± 14 (2SD, n = 345), which is consistent with the published values (0.710248 ± 12, Zhang and Hu, 2020). In addition, analysis of USGS reference materials BCR-2 (basalt) yielded ratios of 0.705012 ± 22 (2SD, n = 63) for 87 Sr/ 86 Sr, which are identical within error to their Song et al., 2001;Xiao et al., 2004;Xu et al., 2001;Zhang et al., 2006; data of HT from the outer zone were obtained from Fan et al., 2008;Lai et al., 2012;Li et al., 2016b;Wang et al., 2007;Xu et al., 2007). ...
... The external precision of 20x Pb/ 204 Pb ratios for the reference material NBS 981 is 0.03 % (2RSD). Zhang and Hu 2020). The internal precision of 20x Pb/ 204 Pb ratio is 0.002 %-0.025 %, and the analytical accuracy is better than 0.03 %. ...
Plume-lithosphere interactions are significant in the formation of Large Igneous Provinces (LIPs). The Permian Emeishan Large Igneous Province (ELIP) is considered to be the result of a mantle plume. The Emeishan flood basalts comprise a major part of the ELIP and they define three zones: the inner, intermediate and outer zones. Both high-Ti and low-Ti basalts are present in the inner zone, whereas only high-Ti basalts are found in the intermediate zone and outer zone. However, there are only sparse outcrops in the outer zone, and so geochemical data on basalts from the outer zone are rare and the role of plume-lithosphere interaction in the petrogenesis of volcanic rocks in the outer zone remains poorly understood. In the Sichuan basin, the Basalt Formation is found between the Permian Maokou Formation limestone and the Longtan Formation marl in some drill cores as well as in outcrops in the basin. This relationship demonstrates that the basaltic layer in the basin is part of the Emeishan flood basalts. These basalts have TiO2 contents of 3.7-4.2 wt.% and Ti/Y ratios of 604-720, being high-Ti sub-alkaline basalts. They display chondrite-normalized rare earth elements (REE) patterns enriched in light rare earth elements (LREE) relative to heavy rare earth elements (HREE) and have elevated large ion lithophile elements (LILE) and high field strength elements (HFSE). Lead isotope ratios are high (²⁰⁶Pb/²⁰⁴Pb(t)= 18.102-18.392, ²⁰⁷Pb/²⁰⁴Pb(t)= 15.578-15.606, ²⁰⁸Pb/²⁰⁴Pb(t)= 38.410-38.850), and εNd(t) values are -0.38∼1.17. Detailed petrology and geochemistry suggest that the high-Ti basalts from the Sichuan Basin did not experience significant contamination of crustal and lithospheric mantle material during the ascent of magma. We infer that these basalts resulted from low-degree melting of the plume mantle source and underwent fractional crystallization of clinopyroxene. The distribution and petrogenesis of the Sichuan Basin basalts in the outer zone are different from those of the basalts in the inner zone and there are clearly different plume-lithosphere interactions in different parts of the ELIP. In the inner zone, the temperature of the lithosphere mantle was markedly elevated due to underplating of the mantle plume, causing a substantial quantity of lithosphere mantle melting and the initial formation of low-Ti basalts. This was followed by melting of the mantle plume and the formation of high-Ti basalts. In the outer zone, lower temperatures further from the plume centre were insufficient to generate extensive melting of the lithospheric mantle. Consequently, only the mantle plume melted in the outer zone, resulting in the formation of high-Ti basalts with minimal lithospheric input.
... The international standards NBS-987 was used to evaluate instrument stability during data collection. The standards yielded an 87 Sr/ 86 Sr ratio of 0.710245 ± 2 (2σ, n = 7) for NBS-987 and a 143 Nd/ 144 Nd ratio = 0.512441 ± 2 (2σ, n = 6) for GSB (Li et al., 2017;Zhang and Hu, 2020). The USGS reference material BCR-2 was measured during the same period to monitor the accuracy of the analytical procedures. ...
The generation, transport, and recrystallization of slab-derived melts/fluids play a critical role in the deep recycling of elements in subduction zones. While boron (B) isotope systematics have been invoked as an important tracer of these processes, its behavior during metamorphic dehydration and partial melting of deeply subducted continental slabs, and the partitioning of B isotopes between minerals and melts/fluids is not fully understood. Here, we investigate these processes through an in situ study of the major, trace-element, and B-Sr isotope variations in different occurrences of tourmaline in migmatite from the Yuka terrane, North Qaidam orogen (China), which resulted from partial melting of a continental slab at different stages during subduction and exhumation. Based on textural and detailed high-resolution X-ray mapping studies, tourmaline was classified into four paragenetic generations (Tur-I, Tur-II, Tur-III, and Tur-IV). Dravitic Tur-I occurs in melanosomes and shows increasing Fe, Ca, and Ti contents from the core to the outer rim. In addition, it has relatively homogeneous Sr isotope values (0.7407–0.7416) and decreasing δ11B values (-3.8 to -8.6‰) and XMg (Mg/(Mg + Fe)) ratios, indicating formation in a rock buffered by an aqueous fluid during the prograde to peak metamorphism. Schorlitic Tur-II occurs within selvage zones between melanosomes and leucosomes, and yields high-Fe values and low δ11B (-13.5 to -10.9‰) and more variable 87Sr/86Sr (0.7343–0.7418) values, indicating crystallization in the presence of a hydrous melt external derived from breakdown of Fe-rich mineral(s) during partial melting of the subducted slab. Dravitic Tur-III formed in the matrix and also enveloped Tur-II. It shows homogeneous 87Sr/86Sr values (0.7411-0.7420) and decreasing δ11B values (-6.8 to -9.9‰) and XMg ratios as well as increasing Fe and Ti contents from core to outer rim. Formation of Tur-III reflects a transitional stage from hydrous melt to aqueous fluid during exhumation. Tur-IV in the leucosomes is essentially a schorl-dravite solid solution with small amounts of Ca. Its 87Sr/86Sr values (0.7402–0.7416) and δ11B values (-11.4 to -8.5‰) are intermediate between the respective values of Tur-II and Tur-III. The formation of Tur-IV likely results from interaction between melt and fluid and, based on its chronological sequence, and is interpreted to have formed during the exhumation stage of the Yuka terrane.
Overall, the variable XMg ratios and δ11B values in the different generations of tourmalines are a consequence of the evolution of the melt/fluid at different depths within the deeply subducted slab. Decreasing δ11B values from Tur-I to Tur-II and Tur-III are controlled by the breakdown of different minerals during partial melting or metamorphic dehydration of the subducted slab, while the co-variations of the elemental geochemistry and B isotopic compositions of tourmaline reflect different depths of formation during subduction and exhumation of the lithosphere. These observations suggest tourmaline may serve as a useful tracer of multiple melt/fluid–rock interactions and of boron cycling in continental subduction zones. The heterogeneity of δ11B in melts/fluids at different depth levels of the continental subducted slab may also result in locally variable B isotope values in syn- and post-collisional magmas.
... ± 0.0023 (2SD, n = 17) for 208 Pb/ 204 Pb. And the Sr-Nd-Pb isotopic values of all standard values match well with the reference values summarized by Zhang and Hu (2020). ...
Paleogene potassium-rich volcanic rocks (PVRs) are widespread in the southeastern Tibetan Plateau, providing an opportunity to illustrate the architecture of the lithosphere and further constrain the development of the SE Plateau. Their petrogenesis, together with the geodynamic mechanism, remains in dispute. Mg isotopic compositions of the PVRs in western Yangtze Craton, along with new elemental and Sr-Nd-Pb isotopic data, are utilized to elucidate their petrogenesis and reveal the plausible metasomatic and genetic mechanisms. The PVRs give a compositional spectrum from basaltic trachyandesite to trachyte and are characterized by high large ion lithophile elements concentrations, negative anomalies in high field strength elements, and enriched Sr-Nd-Pb isotopes, suggesting an origin of enriched lithospheric mantle. The correlations among varying major oxides and fractional crystallization simulation results jointly reveal fractional crystallization of olivine and clinopyroxene in the magmatic process. The less-evolved PVRs present similar major oxide contents (e.g., Ti, Na, K) to those melts originated from carbonated peridotite + silicate sediment. Apart from enriched Sr-Nd-Pb isotopes, they also show high La/Yb ratios (11.73–58.95), low Ti/Ti* (0.08–0.71), Hf/Sm (mostly <0.70), and varying δ²⁶Mg values (−0.13 to −0.36‰). Combined with the Sr-Nd-Mg isotope numerical simulations, it points out that the mantle source of the PVRs was replenished by a hybrid carbonate-silicic sediment, which was plausibly caused by the Neoproterozoic seafloor subduction. These volcanic rocks also present relatively high K2O (3.29–7.50 wt%) and K2O/Na2O ratios (1.00–2.85). Besides, varying elevated Rb/Sr and low Ba/Rb ratios, together with the La/Yb-Yb non-modal batch melting result, suggest that the enriched mantle source recorded by these PVRs is predominantly constituted by a hybrid phlogopite-bearing garnet-spinel lherzolite. Constrained by petrology studies and seismic tomography, the generation of the PVRs is proposed to be closely associated with the delamination of the thickened lithosphere and thereafter asthenosphere upwelling.
