Chemie Der Erde-Geochemistry最新文献

{"title":"Study on flotation recovery of typical carbon-bearing lead-zinc sulphide ore in Guizhou with pre-decarbonization","authors":"Guanghui Li ,&nbsp;Zheyi Zhang ,&nbsp;Qian Wei ,&nbsp;Fen Jiao ,&nbsp;Congren Yang ,&nbsp;Wei Li ,&nbsp;Wenqing Qin","doi":"10.1016/j.chemer.2024.126096","DOIUrl":"10.1016/j.chemer.2024.126096","url":null,"abstract":"<div><p>In this study, a new process of pre-flotation decarbonization‑lead flotation‑zinc flotation was proposed to recover valuable metals from a lead‑zinc ore in Guizhou by beneficiation and to determine a reasonable and economic beneficiation process. The results of the study demonstrate that the novel process aids in the flotation of lead and zinc ores in two ways: (1) pre-decarbonization using MIBC (methyl isobutyl carbinol) and kerosene synergistically achieved the lowest loss of lead recovery of 1.94 % and zinc recovery of 1.14 % in the decarbonized product. (2) the successful separation and retrieval of lead and zinc metals were accomplished via a preferential flotation technique, using several combinations of reagents. This procedure yielded a lead recovery rate of 87.64 % and a zinc recovery rate of 94.09 %.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126096"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140205162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sediment provenance records of the relationship between the southeast margin of the South China Block and Proto-Japan in the Late Triassic","authors":"Zhongjie Xu ,&nbsp;Ningchen Sun ,&nbsp;Rihui Cheng ,&nbsp;Jintao Kong","doi":"10.1016/j.chemer.2024.126114","DOIUrl":"10.1016/j.chemer.2024.126114","url":null,"abstract":"<div><p>The South China Block (SCB) and Proto-Japan (includes Honshu, Kyushu, and Shikoku) are the important geological units in Eastern Eurasia. Their relationship in the Early Mesozoic is contentious, understanding it is crucial for understanding East Asia's evolutionary history and reconstructing the paleo-continent. We present a detrital zircon and provenances study of the Late Triassic Xiaoping Formation, the Genkou Group, and the Wenbinshan Formation on the southeast margin of the SCB. All have similar detrital zircon U<img>Pb age distributions, and three main age groups: 200–300 Ma, 400–500 Ma, and 700–1000 Ma. The primary provenances of the study area are the Yunkai Massif to the west, Hainan Island to the south, and northern Fujian, eastern Hunan, Wuyi Terrane, and Jiangnan Orogen to the north. The distribution of detrital zircons in the southeast margin of the SCB and Proto-Japan is further compared by applying various methods such as multidimensional scaling and Chi-square tests, which shows significant differences in the age distribution patterns of detrital zircons between the two areas. Further provenance analysis reveals significant differences between the southeast margin of the SCB and Proto-Japan during the Late Triassic, suggesting a lack of affinity between the two regions. Therefore, the Late Triassic Proto-Japan likely not located to the southeast margin of the SCB and moving closer to its current position.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126114"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140269418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A remnant root of a Neoproterozoic island arc in the Northern Eastern Desert of Egypt: Evidence from the whole-rock and amphibole chemistry of the Gattar gabbro","authors":"Nasser M. Mahdy ,&nbsp;Yasser Abd El-Rahman ,&nbsp;Matthias Frische ,&nbsp;Martin Ondrejka ,&nbsp;Hamid I. Mira ,&nbsp;Tsuyoshi Iizuka ,&nbsp;Sergey G. Skublov ,&nbsp;Gehad M. Saleh ,&nbsp;Mohamed M. Ghoniem ,&nbsp;Mohammed Mitwally ,&nbsp;Hassan El-Sundolly ,&nbsp;Hassan Eliwa ,&nbsp;Mohammed Hassan ,&nbsp;Taher Nasr ,&nbsp;Hanaa A. El-Dokouny","doi":"10.1016/j.chemer.2024.126113","DOIUrl":"10.1016/j.chemer.2024.126113","url":null,"abstract":"<div><p>The tectonic settings and petrogenesis of Neoproterozoic gabbroic rocks are critical to understand the formation and evolution of the Arabian-Nubian accretionary orogen. We present the whole-rock chemistry and amphibole chemistry of the Gattar gabbro in the northern Eastern Desert of Egypt to better understand the formation of this part of the orogen. The Gattar gabbro is composed of variable proportions of amphibole and plagioclase, which imply the hydrous nature of its parent magma. Trace element patterns of the gabbro and the calculated liquids in equilibrium with its amphibole show enrichment in large ion lithophile elements relative to high field strength elements, which indicate that the Gattar magma formed above a subduction zone. The low abundances of high field strength element in the gabbro are consistent with a depleted mantle source similar to intra-oceanic island arc rocks. However, the high Nb/La ratio of the Gattar gabbro (0.46–10.71) is reminiscent to Nb-enriched mafic rocks from subduction settings. The amphibole chemistry suggests that the hydrous magma of the gabbro crystallized at temperature and pressure estimates of 930 °C and 8 kbar and under oxidizing conditions. The Gattar gabbro is affiliated with the Tonian-Cryogenian arc-related mafic gabbro, which is rarely recorded in this northernmost segment of the Arabian-Nubian orogen. In terms of comparison with the Ediacaran post-orogenic gabbros from the northern Eastern Desert, the Gattar gabbro shows lower concentrations of incompatible elements and Ti/V ratio.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126113"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140404263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gold and sulfide-bearing listvenite in the mantle section of the Tays ophiolite in the Arabian Shield, Saudi Arabia","authors":"Fahad Alshehri ,&nbsp;Mokhles K. Azer ,&nbsp;Paul D. Asimow ,&nbsp;Bassam A. Abuamarah","doi":"10.1016/j.chemer.2024.126081","DOIUrl":"10.1016/j.chemer.2024.126081","url":null,"abstract":"<div><p><span><span>The mantle section of the Late Neoproterozoic Tays ophiolite in the Arabian Shield consists principally of thoroughly serpentinized </span>peridotite<span><span> with characteristics typical of depleted mantle protoliths from a fore-arc environment. The serpentinite is altered along shear zones and thrust planes to gold-bearing listvenite bodies of various sizes. These bodies are divided into carbonate listvenite and silica‑carbonate listvenite; they may be dyke-like or lenticular in form, and are yellowish-brown, reddish-brown, or greyish in outcrop. Carbonate listvenite expresses schistose deformation fabrics concordant to fabric in the host serpentinite, whereas silica‑carbonate listvenite is undeformed at field scale and contains a generation of undeformed minerals at thin-section scale. Silica‑carbonate listvenite contains Cr-rich </span>muscovite (fuchsite) and base-metal sulfides and is enriched in Zn, Pb, Cu, Ag, and Au along with SiO</span></span>₂<span>. The transformation of serpentinite along shear zones to different types of listvenite reflects successive episodes of fluid-mediated metasomatism. Carbonate listvenite develops first, driven by infiltration of CO</span>₂<span>–bearing fluids during serpentinization of the original fore-arc peridotite. Silica‑carbonate listvenite marks a later episode associated with infiltration of K-bearing, SiO</span>₂-saturated fluids released during emplacement of the ophiolite. Listvenitization in the Tays serpentinite concentrated gold in sub-economic to economic extents, with concentrations increasing from host serpentinite (2–4 ng/g) to carbonate listvenite (267–937 ng/g) to silica‑carbonate listvenite (1717–3324 ng/g).</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126081"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139495096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-centric approach for predicting critical metals distribution: Heavy rare earth elements in cretaceous Mediterranean-type karst bauxite deposits, southern Italy","authors":"Roberto Buccione ,&nbsp;Ouafi Ameur-Zaimeche ,&nbsp;Abdelhamid Ouladmansour ,&nbsp;Rabah Kechiched ,&nbsp;Giovanni Mongelli","doi":"10.1016/j.chemer.2023.126026","DOIUrl":"10.1016/j.chemer.2023.126026","url":null,"abstract":"<div><p><span>In the last few years, many efforts have been devoted to the factors controlling the distribution of CMs in karst bauxites<span>, residual deposits hosted in carbonate rocks. Most of these efforts regard Mediterranean-type karst bauxite deposits of Cretaceous age occurring in southern Italy. Further, there is an increasing interest in assessing the usefulness of machine learning applications devoted to geochemically based datasets. With this in mind, we explored a data-centric machine learning arrangement aiming to find the proper input, limited to Al</span></span>₂O₃, Fe₂O₃, TiO₂, and SiO₂, the most abundant major oxides occurring in these ores, for predicting the HREE distribution in southern Italy karst bauxite deposits.</p><p><span><span>Among the machine learning techniques used, Artificial Neural Network (ANN), </span>Support Vector Machine (SVR), Random Forest (RF) and Extreme Gradient Boosting (XGBoost) are those that effectively predict HREE concentrations. A predictive model based on just Al</span>₂O₃, Fe₂O₃, and SiO₂, is one conducing at the worst performance impact suggesting that TiO₂ is a relevant input variable in order to predict HREE concentrations in considered karst bauxite deposits. The XGBoost model was found to deliver the highest accuracy in predicting HREE for the validation data records (R² ~ 0.830, RMSE~7.299, MAE ~ 5.091).</p><p>Moreover, Fe₂O₃ is the highest correlated input variable with the output variable and is a significant predictor in our model suggesting iron oxyhydroxides play a relevant role in distributing HREE, likely through a scavenging mechanism at the expense of soil solutions.</p><p>A further step of our research will involve comprehensive cross-validation studies across multiple areas where Mediterranean-type karst bauxite deposits occur, thus providing a thorough assessment of the model's performance. By addressing these tasks and exploring avenues for improvement, the data-centric approach can advance its potential as a cheap and fast technique to perform a preliminary economic evaluation of potentially HREE abundance, as well as other CMs, in karst bauxite ores benefiting applications reliant on these critical resources.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126026"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76357389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maskelynite- as seen in shocked Lonar target basalt, India, and martian and lunar meteorites","authors":"Dwijesh Ray ,&nbsp;Saumitra Misra ,&nbsp;Changkun Park ,&nbsp;Horton E. Newsom ,&nbsp;Eric J. Peterson","doi":"10.1016/j.chemer.2024.126127","DOIUrl":"10.1016/j.chemer.2024.126127","url":null,"abstract":"<div><p>In this study, we investigate the mineralogical and petrochemical characteristics of maskelynite occurring in a shocked basalt boulder from a terrestrial impact crater on a basaltic target – the Lonar impact crater in India, and the martian and lunar meteorites. The majority of Lonar maskelynite experienced solid-state transformation and maintained almost a uniform chemical composition, consistent with the unshocked feldspar. The locally flow-like texture and marginal vesiculation in feldspathic glass are needed in interaction with the impact-melt. The vesiculated melt occasionally occurring at the margins of maskelynite is characterised by Na-loss due to the shock-induced volatility. A shock pressure of ≤42 GPa and at a temperature of ≤1000 °C appear consistent for the formation of Lonar vesiculated melt/ feldspathic glass. Under the impact-induced shock metamorphism, maskelynite samples from the moon retain both the crystalline and amorphous domains with a distinct chemical heterogeneity attributed to different shock metamorphism effects of the plagioclase. In contrast, the martian maskelynites exhibit a smooth, homogeneous composition. The estimated shock pressure is relatively higher at ∼42–45 GPa based on experiments and models. The difference in Si/Al ratio in lunar (1–1.3) and martian maskelynite (1.5–1.9) suggests its inherent difference in composition of the crust, whereas the Lonar maskelynite shows overlapping composition with the martian maskelynite contending Lonar basalt as a potential terrestrial analogue to the martian crust.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126127"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140927646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micro-Raman mapping of critical metals (Li, Co, Ni) in a rhythmically laminated deep-ocean ferromanganese deposit","authors":"Simone Bernardini ,&nbsp;Giancarlo Della Ventura ,&nbsp;Armida Sodo ,&nbsp;Mariana Benites ,&nbsp;Luigi Jovane ,&nbsp;James R. Hein ,&nbsp;Federico Lucci","doi":"10.1016/j.chemer.2023.126014","DOIUrl":"10.1016/j.chemer.2023.126014","url":null,"abstract":"<div><p>Deep-ocean ferromanganese deposits represent one of the most important strategic reservoirs for rare and critical metals. In particular, Mn-oxyhydroxides, such as asbolane and lithiophorite, concentrate large amounts of Li, Ni, and Co into polymetallic nodules and crusts. However, because of their poor crystallinity and the presence of finely intermixed additional phases, these minerals cannot be unambiguously identified by standard X-ray powder diffraction methods. In addition, Li cannot be routinely detected by standard X-ray spectroscopy techniques.</p><p>In this work we show how the spatial distribution of asbolane (the Ni-Co-rich Mn-oxide) and lithiophorite (the Li-rich Mn-oxide) across strongly inhomogeneous ferromanganese mineralizations can be investigated at high-resolution (∼ 1 μm) <em>via</em> fast and easily accessible Raman scattering measurements. Because of the strong selectivity of these minerals to the incorporation of critical metals, the obtained micro-Raman maps provide also an indirect map of the Co and Ni <em>vs</em>. Li distribution in the crusts. The described results thus show that our spectroscopic approach could represent an efficient and valuable <em>in situ</em> tool for mineral chemistry and resource evaluation of these elements in ferromanganese deposits from deep-ocean environments. This research opens a new frontier for the application of Raman spectroscopy in ore prospecting for critical minerals and metals.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126014"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S000928192300065X/pdfft?md5=e8f276eed9ce2859ec3b9e1fe89e0fc4&pid=1-s2.0-S000928192300065X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81228287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral chemistry and thermobarometry of the pre-rift Upper Cretaceous to Paleocene melilite-bearing dykes from the northern part of the Bohemian Massif (Ploučnice River region): Implications for compositional variations of spinels from ultracalcic melts","authors":"David Buriánek ,&nbsp;Kamil Kropáč ,&nbsp;Yulia V. Erban Kochergina","doi":"10.1016/j.chemer.2024.126090","DOIUrl":"10.1016/j.chemer.2024.126090","url":null,"abstract":"<div><p>The Ploučnice River region (polzenite group) is uniquely characterized by its melilite-bearing subvolcanic rocks located in the northern section of the Bohemian Massif. They are the crystallization products of ultracalcic melts during the pre-rift evolution of the Ohře/Eger Rift, which is the easternmost part of the European Cenozoic Rift System. The melt was produced by low-degree partial melting of carbonate-bearing garnet peridotite and pyroxenite at a depth of approximately 100 km (P ~ 3.0 Gpa). The rapid ascent of the ultracalcic melts through the lithosphere was accompanied by fractional crystallization of olivine + spinel ± clinopyroxene mainly within the upper to middle crustal storage zone at depths between 12 and 24 km (0.3–0.6 Gpa). Notably, olivine crystallized generally at higher temperatures (1257–1356 °C) compared to clinopyroxene (1156–1203 °C) and plagioclase (1099–1112 °C). The calculated oxygen fugacity during fractional crystallization (perovskite, −4.8 to +3.9 ΔNNO) decreases at the late-stage of crystallization due to residual magma exsolving oxidizing fluids and decreased fO₂ (oxygen fugacity) of the magmas from which monticellite was crystallized (ΔNNO −6.0 to −3.9). The rounded shapes and chemical composition (Cr/(Cr + Al) 0.52–0.82) of partially resorbed chromite xenocrystic cores in subhedral to euhedral spinel grains indicate that they originated in the mantle. The first stage of magmatic evolution for the studied rocks is related to the Cr-spinel (Cr/(Cr + Al) 0.35–0.50) crystallization, which successively changed to a high-alumina composition (Cr/(Cr + Al) 0.25–0.30). Magnetite (magnetite–ulvöspinel solid solution) forms an atoll texture or small euhedral crystals in the groundmass. Both textural types of magnetite crystallized during the late-stage magmatic evolution of the ultracalcic melt. Carbonate or quartz-rich xenoliths were incorporated during magma emplacement under the upper crust. Sr-Nd isotopic data, mineral composition, and whole-rock chemical composition all verified that the assimilation of the xenoliths only affected the chemical composition of the host magma in the immediate neighborhood of the contract (up to a few millimeters around the xenolith).</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126090"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139891855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unsupervised machine learning-based prospectivity analysis of NW and NE India for carbonatite-alkaline complex-related REE deposits","authors":"Malcolm Aranha ,&nbsp;Alok Porwal ,&nbsp;Ignacio González-Álvarez","doi":"10.1016/j.chemer.2023.126017","DOIUrl":"10.1016/j.chemer.2023.126017","url":null,"abstract":"<div><p>Rare Earth Elements (REE) form critical raw materials in environment-friendly, high-technology devices and components, and therefore have been classified as “critical minerals and metals” by most countries. About 62% of the global resources of REE occur associated with carbonatite-alkaline complexes; however, the entire production of REE in India currently comes from secondary deposits, even though India contains a variety of REE-enriched primary source rocks, particularly carbonatites and alkaline complexes. There is, therefore, a significant potential in the county for new REE deposit discoveries associated with carbonatite-alkaline complexes. This research attempts to identify exploration targets for REE associated with carbonatite-alkaline complexes in northern India utilising a Self-Organising Maps (SOM)-driven workflow. This unsupervised machine-learning-based workflow eliminates the hand-crafting of input predictor features. The algorithm creates clusters of features directly from primary gridded geophysical and topographical datasets. The obtained clusters are then analysed based on available geological knowledge and empirical spatial associations with known occurrences in the study areas to identify prospective clusters and generate prospectivity maps. Nine new targets are identified across the Shillong plateau in northeastern and Western Rajasthan in northwestern India. These new targets, in addition to the known carbonatite-alkaline complexes, are recommended for further data collection and follow-up exploration. It is noteworthy that these targets conform to the targets identified by Aranha et al. (2022a, 2022b) using mineral systems-guided fuzzy inference systems.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126017"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74189719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neoproterozoic sedimentary rocks in the Liantuo Formation in South China and their implication based on geochronological and Sr–Nd–Hf–Pb isotope insights","authors":"Juanjuan Kong ,&nbsp;Yuanyuan Xiao ,&nbsp;Peishan Sui","doi":"10.1016/j.chemer.2024.126115","DOIUrl":"10.1016/j.chemer.2024.126115","url":null,"abstract":"<div><p>Deposition of the Liantuo Formation is closely associated with the evolutionary history of the Rodinia supercontinent, as indicated by the breakup of the Yangtze Craton in South China. In this paper, we also carried out a detailed U<img>Pb zircon examination of the Liantuo Formation. Radiometric dating of sandstone within the Liantuo Formation suggested that it was deposited ca. 790 Ma, which coordinated with the age-paleopole contradictions in the Liantuo Formation for exploring the evolutionary history of the Yangtze Block during the breakup of the Rodinia supercontinent. All the Liantuo sandstones and shales have variable Sr isotopic compositions, with initial Sr isotope ratios ranging from 0.6920 to 0.7217, which support significant fluvial contributions during the deposition of the Liantuo Formation. Samples of the Liantuo Formation show distinct variations in Nd<img>Hf isotopic compositions, suggesting that the Nantuo Formation received relatively juvenile materials (e.g., the newly formed Neoproterozoic rocks from the northern margin of the Yangtze Block), whereas the Liantuo Formation received relatively mature inputs (e.g., the Huangling granitoids and/or Kongling complex). The samples from the Liantuo Formation also contain various Pb isotopes (²⁰⁶Pb/²⁰⁴Pb = 17.56–17.76, ²⁰⁷Pb/²⁰⁴Pb = 15.05–15.43 and ²⁰⁸Pb/²⁰⁴Pb = 35.51–36.79). These values are also close to the Pb isotopic compositions of the Kongling complex, which suggest that the sedimentary rocks were enriched (the Kongling complex) and are consistent with the Nd<img>Hf isotope data. That is, the major provenance of the Liantuo Formation is from the South China Block basement, which is the local Kongling complex. In contrast, the Luoquan diamictite can represent the well-mixed composition of the upper continental crust (UCC) in the North China Block during the Neoproterozoic.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 2","pages":"Article 126115"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0009281924000394/pdfft?md5=a9e5e48602593b51ceb68f0a5ac583ae&pid=1-s2.0-S0009281924000394-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}