Solid Earth Sciences最新文献

{"title":"Litho-stratigraphic characterization of hydrogeological and hydraulic flow units via electrical resistivity, Stratigraphic Modified Lorenz Plots, and flow zone indicator models","authors":"Ndifreke I. Udosen,&nbsp;Aniekan M. Ekanem,&nbsp;Nyakno J. George","doi":"10.1016/j.sesci.2024.100191","DOIUrl":"10.1016/j.sesci.2024.100191","url":null,"abstract":"<div><p>Litho-stratigraphic characterization within hydrogeological units of a major aquifer system in Southern Nigeria was carried out using Electrical Resistivity (ER), Stratigraphic Modified Lorenz Plots (SMLP), and Flow Zone Indicator (FZI) algorithms. The aim of integrating these technologies was to generate hydraulic flow units (HFU) that would describe the speed of flow and efficiency within the aquifer's stratigraphic units. Electrical Resistivity technology delineated four geoelectric layers within the study area: motley topsoil, coarse sand, fine sand, and sandy clay, with the aquiferous formation being the third layer. Via measures obtained from geo-electrical data, major geo-hydraulic parameters were estimated. The hydraulic conductivity ranged from 3.1 x 10⁻⁵ to 9.3 x 10⁻⁵ m/s, effective porosity ranged from 0.33 to 0.54, permeability ranged from 4362.9 to 13143.4 mD, tortuosity ranged from 0.85 to 0.97, Aquifer Quality Index (AQI) values ranged from 3.57 to 4.88 and Flow Zone Indicator values ranged from 4.11 to 7.00. The Stratigraphic Modified Lorenz Plots delineated the presence of three hydraulic flow units within the region. The first hydraulic flow zone was a superconductor with good efficiency ranking; the second and third flow zones were conductors having fair efficiency rankings. Results obtained from measures of Aquifer Quality Index (AQI) were employed to generate Discrete Rock Typing (DRT) results which indicated the presence of two distinct aquifer rock matrix types. The Dykstra-Parson co-efficient, employed in evaluation of aquifer heterogeneity, gave a value of unity, indicating perfect heterogeneity of the aquifer.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100191"},"PeriodicalIF":2.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000291/pdfft?md5=621369772622818cf06dcdf75eab1158&pid=1-s2.0-S2451912X24000291-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141961245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Stratigraphic correlation and provenance study of exposed Eocene - Oligocene sedimentary sequences in southern Nigeria using high-resolution heavy minerals and garnet geochemical analyses","authors":"Azuka Ocheli ,&nbsp;Ovie Benjamin Ogbe ,&nbsp;Ejiro Newton Omoko ,&nbsp;Godwin Okumagbe Aigbadon","doi":"10.1016/j.sesci.2024.100189","DOIUrl":"10.1016/j.sesci.2024.100189","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Provenance and stratigraphic correlations across the exposed Eocene-Miocene sedimentary sequences of southern Nigeria that exhibit similar lithologies and are biostratigraphically-barren have been carried out. Heavy mineral assemblages in the 63–250 μm sand fractions of 43 sediment samples across the sedimentary sequences were assessed via wet-sieving, centrifugation, and polarizing petrologic microscopic analyses. Opaque, apatite, garnet, kyanite, zircon, rutile, staurolite, tourmaline, and epidote heavy mineral species were identified and point-counted. Electron microprobe analysis was carried out on the garnet-heavy mineral species using a CAMEBAX Cameca electron microprobe with a link four-wavelength energy-dispersive mode spectrometer analyser. This study revealed the existence of three heavy mineral associations and three lithostratigraphic formations. Heavy mineral association A is characterized by assemblages of kyanite, zircon, and rutile grains. The occurrence of kyanite in this association indicates derivation from schist and gneissic rocks. Zircon grains indicate sialic to intermediate igneous rocks derivatives that has sustained several periods of recycling, and redeposition. The occurrence of rutile indicates metamafic and metapelitic rocks with other sources being minor. Heavy mineral association B is characterized by assemblages of staurolite, opaque materials, garnet, and epidote. The presence of opaque grains indicates a shorter distance of transport possibly from proximity. The occurrence of staurolite grains indicates metamorphic and magmatic rock derivatives from schists, slates, and gneisses. Garnets are predominantly derived from high-grade metamorphic rock (granulite-facies) metasediments and charnockites and lower grade (amphibolite-facies) metasedimentary rocks and granitoids. An epidote is a metamorphosed igneous rock derived from the adjoining radix. Heavy mineral association C is characterized by assemblages of tourmaline and apatite. Tourmaline grains indicate pneumatolytic rocks, pegmatite, schist, gneisses, and marble source rocks. Apatite indicates derivation from local outcrops exposed during the Benue Trough uplift. The occurrence of apatite and its assemblages with tourmaline indicate felsic igneous rocks with ultramafic compositions, metamorphic rocks with low to high grades and derivatives of diverse protolith compositions. The exposed Eocene-Miocene sedimentary deposits that exhibit similar lithologies and biodata are relatively lacking. They were differentiated into three different lithostratigraphic formations and correlated. These analyses were performed using heavy mineral characterization, optical property, garnet geochemical composition, and inference supported by multivariate statistical analyses. Variations in the numerical values of unstable heavy minerals reveal dissolution and overgrowth through acidic groundwater, changes in climatic conditions, and relative eustatic sea-level changes. Th","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100189"},"PeriodicalIF":2.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000278/pdfft?md5=c16d090ee5ddecd92c488b52381e364f&pid=1-s2.0-S2451912X24000278-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141728752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Evolution of Earth's habitability regulated by deep earth processes","authors":"Yi-Gang Xu","doi":"10.1016/j.sesci.2024.100190","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100190","url":null,"abstract":"","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100190"},"PeriodicalIF":2.0,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X2400028X/pdfft?md5=cda7517f5452c7752a91e34f0ca72871&pid=1-s2.0-S2451912X2400028X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141607759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Origin of continental red beds: Warming from above or heating from below?","authors":"Lianting Jiang ,&nbsp;Chun'an Tang ,&nbsp;Bin Gong ,&nbsp;Zhen Chen ,&nbsp;Tiantian Chen ,&nbsp;Zhanjie Qin ,&nbsp;Guoneng Chen","doi":"10.1016/j.sesci.2024.100187","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100187","url":null,"abstract":"<div><p>The formation of continental red beds is generally considered to be related to an arid climate. Heating experiments (performed by L.J. and G.C.) using dried black mud sediment also demonstrate that the reddening may be caused by the transformation of goethite to haematite that begins at approximately 150 °C under anhydrous conditions, and increasing the temperature to 450 °C is positively correlated with the red colour and peak value of haematite. If this process applies to continental red beds, it implies a thermal origin of red beds as a result of high diagenetic temperatures rather than as the cause of their deposition under an arid climate. Namely, subsiding red-bed basins are heated from below rather than warmed from above. Here, we further strengthen this idea by new evidence from borehole cores drilled from red beds in SE China, showing a clear geological section from the surface soil to red beds to bottom granite. The data reveal that the continental red beds formed at least at a temperature within 150–400 °C, and the underlying granite usually formed at temperatures greater than 600 °C. Our results imply a possible relationship between continental red bed events and Earth's thermal cycles.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100187"},"PeriodicalIF":2.0,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000254/pdfft?md5=f90c136f9832d41f2f2e6d84960ec8a4&pid=1-s2.0-S2451912X24000254-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141291374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Geochemical constrains for unravelling the condition of sedimentation, provenance, paleoclimate variation, and metallogenic implication of the cretaceous deposits of Mayo Oulo Basin (North Cameroon, Africa)","authors":"J. Ngo Elogan Ntem ,&nbsp;V. Ngounfack Tiokeng ,&nbsp;R. Toyama ,&nbsp;Y. Berinyuy Konglim ,&nbsp;J.F. Takou ,&nbsp;N. Togoum ,&nbsp;T. Ngnotue ,&nbsp;M.S. Tchouatcha","doi":"10.1016/j.sesci.2024.100188","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100188","url":null,"abstract":"<div><p>The sediments from the Mayo Oulo intracontinental Basin, along the N–S cross section between the Gadavou and Lombel localities in central part of the basin, were investigated through major and trace elements geochemistry associated with palynological analysis to determine their condition of sedimentation, paleoclimate evolution and metallogenic implication along the Cretaceous sequence from the N–S cross section of the central part of this basin. From bottom to top of this sequence there are various types of facies with various concentrations of carbonate. Based on their major oxides compositions, the sediments were classified as Shales associated with Fe-shales, Fe-sands, Wacke and Litharenite. The CIX (Chemical Index of Alteration, 62.65 to 98.14) and PIX (Plagioclase Index of Alteration, 65.00 to 99.13) sediments underwent a various chemical weathering; little chemical weathering in the middle to the upper part of the sequence and moderate to high chemical weathering in the lower part. The discriminant function-based multidimensional tectonic diagrams indicate mainly and respectively arc-collisional and Island arc-active continental margin settings which are consistent with the Precambrian geological history of the study area. The SiO₂ vs. Al₂O₃+K₂O + Na₂O, C-values, associated with trace elements plots such as Sr/Ba, and Rb/Sr, and palynological content (continental or terrestrial species exclusively, dominated by Gymnosperm pollens such as. <em>Inaperturopollenites</em> sp., <em>Araucariacites</em> sp. and <em>Classopollis</em> sp, associated with spores such as <em>Cicatricosisporites</em> sp) indicate mainly arid to semi-arid climate with periodic humid to semi-humid conditions. The Sr/Ba values ranging from 0.084 to 6.408 suggest a fluctuating and sometimes high salinity (Hypersaline milieu). The rare earth elements data show high LREE/HREE ratios (2.86–13.31); high negative and positive Eu anomaly (Eu/Eu∗ = 0.33 to 1.38) and no Ce anomaly (Ce/Ce∗ = 0.94 to 1.02); these features, together with mixed major and trace element ratios and plots such as, Al₂O₃/TiO₂ ratios (14.31–54.26); Th/Co ratios (0.30–14.58); Ce vs La/Yb, Zr vs TiO₂ and La/Sc vs Th/Co plots, indicate that the sediments are derived mainly from felsic to intermediate or mafic rock composition. Ni/Co (1.86–3.59) and U/Th (0.03–0.76) ratios are consistent with oxic conditions from bottom to top of the sequence. The Al/Si ratio shows positive correlation with CIA, Th, Zr, Hf, Na, K and negative correlation with Ca and Mg. The positive correlation with K, Hf, Na, Zr, and Th from detrital origin and negative correlation with Ca and Mg from chemical origin could suggest the geochemical composition control of grain size. According to the ternary Al–Fe–Mn diagram metallogenic classification, the studied samples are essentially terrigenous and partially weakly metalliferous, clos","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100188"},"PeriodicalIF":2.0,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000266/pdfft?md5=4e94c9fdd07d3dbb9c8f3ebf0bd6c084&pid=1-s2.0-S2451912X24000266-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141291385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Removal notice to “Tracing the evolution of shallow geothermal springs in the Shyok−Nubra Valley of North-West Himalayas, India through hydrogeochemistry and stable isotopes (δ18O, δD)” [Solid Earth Sci. 9 (2024) 100175]","authors":"Parashar Mishra ,&nbsp;Archisman Dutta ,&nbsp;Ahsan Absar ,&nbsp;Vivek Prakash Malviya ,&nbsp;Pankaj Saini ,&nbsp;Ayodhaya Prasad Thapliyal ,&nbsp;Sayandeep Banerjee","doi":"10.1016/j.sesci.2024.100218","DOIUrl":"10.1016/j.sesci.2024.100218","url":null,"abstract":"<div><div>This article has been removed: please see Elsevier Policy on Article Withdrawal (<span><span>https://www.elsevier.com/about/policies/article-withdrawal</span><svg><path></path></svg></span>).</div><div>This article has been removed at the request of the Editor in Chief and the owner of the journal. The reason for the removal is not related to the scientific content of the article but rather to a legal issue regarding a map presented in the paper.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 2","pages":"Article 100218"},"PeriodicalIF":2.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Geochronology and geochemistry of garnet from Tongguanshan skarn Cu deposit, Tongling, eastern China: insights into ore-forming process","authors":"Shan Huang,&nbsp;Jiancheng Xie,&nbsp;Quanzhong Li,&nbsp;Likai Ge,&nbsp;Liu Yang,&nbsp;Jun Yan","doi":"10.1016/j.sesci.2024.100167","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100167","url":null,"abstract":"<div><p>Skarn Cu deposits are one of most important deposit-type in Middle-Lower Yangtze River region, eastern China, but skarn formation process remains unclear. Mineralogical, morphological and in situ geochemical data from the skarn stage of Tongguanshan skarn Cu deposit in Tongling region are systemically investigated, to reveal the timing, physical-chemical conditions, and fluid evolution during the skarn formation. The Tongguanshan garnets can be identified homogeneous and unzoned early generation garnet (GrtI), and oscillating zoned late generation garnet (GrtII) with the Fe-rich core (GrtII-Fe) and Al-rich edge (GrtII-Al). Garnet U–Pb dating results show that the Tongguanshan Cu mineralization was formed in 145.6 ± 4.4 Ma. In situ elemental composition results of the garnet samples indicate that they belong to grossular-andradite solid solution series, and are a magmatic-hydrothermal origin. The distinctly geochemical characteristics (e.g., Sn and U contents, (La/Yb)_N, δEu and Y/Ho values) reveal that the physiochemical conditions from GrtI to GrtII-Fe, and GrtII-Fe to GrtII-Al stages in the Tongguanshan skarn formation were an increase and a decrease of fluid salinity and oxygen fugacity, closed to open and then to closed of fluid environment, and neutral-weakly acidic to acidic and acidic to neutral-weakly acidic of fluid pH, respectively. A comprehensive discriminant analysis indicates a fluid boiling occurred in the GrtI to GrtII-Fe stage of the Tongguanshan skarn Cu deposit, and there is little or no external fluid mixed during the skarn stage.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 2","pages":"Article 100167"},"PeriodicalIF":2.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000059/pdfft?md5=7a210b3f973ca909ba35c89b02ef9ee2&pid=1-s2.0-S2451912X24000059-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141066969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Genesis of the Panzijian gold deposit in Jiaodong Peninsula, Eastern China: Insights from fluid inclusion and isotopes","authors":"Mingzhen Li ,&nbsp;Guangzhou Mao ,&nbsp;Zhengjiang Ding ,&nbsp;Qinglin Xu ,&nbsp;Huiji Zhao ,&nbsp;Yanchao Han ,&nbsp;Tieliang He","doi":"10.1016/j.sesci.2024.100177","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100177","url":null,"abstract":"<div><p>The Panzijian gold deposit is located in the Jiaobei uplift on the eastern margin of North China Craton. It is a quartz vein-type gold deposit in the southern end of the Qixia-Penglai ore belt. In order to explore the source and properties of ore-forming fluids and materials in the Panzijian gold deposit, explore the ore-forming process and reveal the genesis of the deposit, this work has carried out petrographic observation and temperature measurement of gold-bearing quartz fluid inclusions, laser Raman experiment, gold-bearing quartz H–O isotope study, and gold-bearing pyrite Pb isotope study. The Panjian gold deposit is divided into four metallogenic stages and the metallogenic stage Ⅲ is the main gold mineralization stage. Fluid inclusions show that the ore-forming fluids at the Panzijian gold deposit belong to a CO₂–H₂O–NaCl system with low temperature (172–341 °C), salinity (1.57–10.49 wt% NaCl), and density (0.79–0.96 g/cm³). Gold-bearing Quartz H–O isotopic data (δD = −79.8 to −65.1‰, δ¹⁸O_H2O = 1.33–2.63‰) show that the ore-forming fluid was derived from the mixing of magmatic water and meteoric water. Gold-bearing Pyrite Pb isotopes with crustal signature (²⁰⁶Pb/²⁰⁴Pb = 16.06–16.943, ²⁰⁷Pb/²⁰⁴Pb = 15.337–15.858, ²⁰⁸Pb/²⁰⁴Pb = 37.143–38.081, and ²⁰⁶Pb/²⁰⁷Pb = 1.025–1.105) support that some ore-forming materials were crust-derived. We proposed a metallogenic model for the Panzijian gold deposit: Stress transition of Jiaobei uplift tectonic system inducing asthenospheric upwelling. The lithostatic pressure dropped and fluids were exsolved from the magma. The ore-forming fluid ascended along local faults and the pressure further dropped, resulting in fluid immiscibility and gold deposition along structural traps (e.g., faults).</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 2","pages":"Article 100177"},"PeriodicalIF":2.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000151/pdfft?md5=c175166c0eeb37109f0aa62948b6efa3&pid=1-s2.0-S2451912X24000151-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140947573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Mineralization of Zr-REE-Y in the Ngaoumbol iron formations, central Cameroon: Insights from petrography, mineral chemistry and whole rock geochemistry","authors":"Guy Bertin Takam Tchoupe ,&nbsp;Ekah Nzume Ndime ,&nbsp;Donald Hermann Fossi ,&nbsp;Arlette Soh Djoukouo ,&nbsp;Milan Stafford Tchouatcha ,&nbsp;Steven Arnold Mbita Motto ,&nbsp;Sylvestre Ganno ,&nbsp;Jean Paul Nzenti","doi":"10.1016/j.sesci.2024.100178","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100178","url":null,"abstract":"<div><p>The increasing importance of rare earth elements (REE) and critical metals in contemporary society has led us to investigate the mineral potential of the Ngaoumbol area, located within Cameroon's Central African Fold Belt (CAFB). In this study, we have conducted a comprehensive analysis that includes petrography, whole rock geochemistry, and mineral chemistry, along with the application of an outlook coefficient known as Koult, with the aim to evaluate the prospectivity of the Ngaoumbol iron formations as a potential source of REE-Y resources. This coefficient is defined as the ratio of the relative abundance of critical Rare Earth Elements to the relative abundance of excess REE. The iron formations in the Ngaoumbol area are fine-to medium-grained foliated rocks with alternating magnetite and actinolite bands and quartz bands, suggesting a sedimentary parentage. These rocks have an average REE-Y content of 1438.43 ppm and a Koult of 0.77, indicating their potential as raw sources for REE. Furthermore, the investigated samples exhibit high average Zr content (7748 ppm), suggesting that the rocks may host potentially economic Zr ore. The Zr-REE-Y mineralization in the Ngaoumbol area is hosted in detrital zircon, monazite and xenotime, probably deriving from the weathering of alkaline/subalkaline rocks surrounding the deposits. Our findings suggest that the Ngaoumbol area has promising REE and Zr resources. However, further exploration and evaluation are necessary to determine the extent and economic viability of these resources.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 2","pages":"Article 100178"},"PeriodicalIF":2.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000163/pdfft?md5=2f786786a7f2ca785cf2ff9bfb4a9839&pid=1-s2.0-S2451912X24000163-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140878536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Petrogenesis, metallogenesis, and geodynamic setting of the Zhuqing gabbroic intrusion and associated Fe–Ti–V oxide deposits in the SW Yangtze Block, South China","authors":"Dan Wang ,&nbsp;Yuanbao Song ,&nbsp;Zhiming Sun ,&nbsp;Wei Zhang ,&nbsp;Wei Liu ,&nbsp;Xiaoyong Yang","doi":"10.1016/j.sesci.2024.100176","DOIUrl":"https://doi.org/10.1016/j.sesci.2024.100176","url":null,"abstract":"<div><p>Th<strong>e</strong> Zhuqing vanadium–titanium magnetite is a large deposit recently discovered in the western margin of the Yangtze Block, where the Zhuqing gabbroic intrusion and associated Fe–Ti–V oxide deposits are fund and dated at 1647 ± 39 Ma (MSWD = 0.79) through U–Pb dating of gabbro zircons. The εHf(t) values of zircons are all positive, with an average of 10.7. The average age of the one-stage model age (T_DM) is 1661 Ma, which is very close to the diagenetic and metallogenic age 1647 ± 39 Ma (MSWD = 0.79). These new results indicate that the magma source come directly from the mantle. The contents of Al₂O₃, CaO, and (Na₂O + K₂O) increases with the increase of SiO₂ contents, while, the contents of MgO, TiO₂, and Fe₂O₃ decreases with the increase of SiO₂ contents. Mg^# is relatively stable with the increase of SiO₂ contents. In the primitive mantle-normalized trace element spider diagrams and chondrite-normalized rare earth element patterns, the characteristics of all samples are similar to that of ocean island basalts (OIBs), showing a right inclination curve. Meanwhile the western margin of the Yangtze Block as an essential part of the supercontinent of Colombia, began to extend at 1.7 Ga, lasted to ca. 1.4 Ga, and finally split. These suggest that the Zhuqing gabbroic intrusion and associated Fe–Ti–V oxide deposits with OIB characteristics formed in the Late Paleoproterozoic, which is a response to the breakup of the Colombian supercontinent in the western margin of the Yangtze Block.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 2","pages":"Article 100176"},"PeriodicalIF":2.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X2400014X/pdfft?md5=56b33865de76dfbce3515500924c7155&pid=1-s2.0-S2451912X2400014X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140605606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}