Precambrian Research最新文献

{"title":"Paleoproterozoic orogeny in northern part of the Yangtze Block: Evidence from intermediate-acidic intrusive rocks of the Houhe Complex","authors":"Xiaoqi Li ,&nbsp;Yan Zhao ,&nbsp;Wenhao Ao ,&nbsp;Meiqian Xu ,&nbsp;Juan Zhang","doi":"10.1016/j.precamres.2025.107827","DOIUrl":"10.1016/j.precamres.2025.107827","url":null,"abstract":"<div><div>Investigations on the petrogenesis and geological significances of intermediate-acidic intrusions from the Houhe Complex provide crucial insights for understanding Paleoproterozoic tectonic evolution of the northern Yangtze Block. The intermediate rocks (quartz monzonite, diorite, and quartz diorite), crystallized at ∼ 2.08 Ga, exhibit high Na₂O + K₂O (5.94–9.47 wt%), Mg# (46.1–49.7), and elevated Cr (17.4–82.6 ppm) and Ni (11.4–29.0 ppm) concentrations, along with whole-rock <em>ɛ</em>_Nd(t) and zircon <em>ε</em>_Hf(t) values of –1.2 to + 1.1 and –0.5 to + 2.8, respectively, corresponding to two–stage Nd-Hf model ages of 2.8–2.5 Ga, suggesting their derivation from partial melting of ancient mafic lower crust with contributions of lithospheric mantle- and subducted slab-derived materials. The acidic rocks, comprising ∼ 2.07 Ga monzogranite (Mg# = 33.9–39.2; Cr = 9.54–18.1 ppm; Ni = 5.99–8.06 ppm) and ∼ 2.03 Ga Na-rich granite (Na₂O/K₂O = 7.28–15.0; Mg# = 37.6–48.2; Cr = 0.96–2.32 ppm; Ni = 4.31–5.46 ppm), exhibit whole–rock <em>ɛ</em>_Nd(t) and zircon <em>ε</em>_Hf(t) values of –2.1 to + 0.9 and –0.6 to + 3.0, respectively, with two-stage Nd-Hf model ages of 2.8–2.5 Ga, suggesting their origin from partial melting of Neoarchean mafic-felsic crustal materials with negligible mantle- and subducted slab contributions. Both intermediate and acidic rocks exhibit low Rb, Ta, Nb and Y concentrations, and low Nb/Zr values. Additionally, the crustal thickness calculated based on whole-rock (La/Yb)_N values exceeds 60 Km at ∼ 2.0 Ga. Collectively, these findings suggest that the Paleoproterozoic (2.1–2.0 Ga) intermediate-acidic intrusions from the Houhe Complex formed in an active continental margin tectonic setting. Furthermore, integrating the temporal-spatial distribution of Paleoproterozoic rock units, especially ophiolitic mélange in the northern Yangtze Block, it is proposed that the eastern and western parts of the northern Yangtze Block possibly assembled along the Huangling–Zhongxiang subduction-collision zone at ∼ 2.0–1.9 Ga, corresponding to the global Columbia supercontinent–related orogenic events during ∼ 2.1–1.9 Ga.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"427 ","pages":"Article 107827"},"PeriodicalIF":3.2,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prolonged prograde metamorphism and nonlinear cooling in early plate tectonics: Evidence from garnet diffusion modeling","authors":"Yi Zou ,&nbsp;Junxing Chen ,&nbsp;Lei Zhao ,&nbsp;Jinghui Guo ,&nbsp;Mingguo Zhai","doi":"10.1016/j.precamres.2025.107857","DOIUrl":"10.1016/j.precamres.2025.107857","url":null,"abstract":"<div><div>The establishment and evolution of early plate tectonics are crucial for the Earth’s environment to develop toward habitability. However, the rates and timescales of early plate tectonic processes remain poorly constrained due to the limited temporal resolution of <em>in situ</em> radiometric dating. In this study, we apply diffusion chronometry to pelitic granulites from the Jiaobei terrane, North China Craton, integrating phase equilibria modeling, thermobarometry, and U-Pb geochronology. The studied pelitic granulites record peak high-pressure (HP) granulite-facies metamorphism (&gt;1.0 GPa, &gt;800 °C), followed by post-peak decompression with possible heating to 0.5–0.7 GPa and 880–970 °C, and subsequent cooling to ∼ 0.5 GPa and ∼ 600 °C. <em>In situ</em> zircon and monazite U-Pb dating indicates that post-peak decompression and retrograde cooling occurred at 1.86–1.85 Ga. Diffusion simulations of garnet Lu-Hf and Sm-Nd, combined with their isotopic ages, suggest that prograde metamorphism may have persisted for ∼ 80 Myr, implying slow subduction or prolonged continental collision, consistent with lithospheric peeling processes under hotter Paleoproterozoic mantle conditions. The result from the Jiaobei terrane thus shows inefficient surface material transfer to depth during the Paleoproterozoic. Additionally, diffusion modeling of garnet-biotite Fe-Mg exchange reveals a nonlinear cooling history, with an initial rapid cooling phase (800–700 °C) within a few million years, followed by prolonged slower cooling (700–600 °C) over tens of millions of years. The nonlinear cooling behavior resembles that of modern orogenic granulites, but the generally slower rates likely reflect hotter crustal thermal regimes and weaker lithospheric strength compared to their Phanerozoic counterparts. Our findings highlight the power of diffusion chronometry in resolving high-resolution metamorphic timescales beyond the limits of radiometric dating, offering critical insights into the geodynamics of early plate tectonics.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"427 ","pages":"Article 107857"},"PeriodicalIF":3.2,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotopic identification of paleo rift zones within the Sveconorwegian Province; implications for nickel sulphide mineralisations in the SW Fennoscandian Shield","authors":"Alf Andre Orvik,&nbsp;Eduardo T. Mansur,&nbsp;Iain Henderson,&nbsp;Trond Slagstad,&nbsp;Magdalena Huyskens,&nbsp;Terje Bjerkgård","doi":"10.1016/j.precamres.2025.107836","DOIUrl":"10.1016/j.precamres.2025.107836","url":null,"abstract":"<div><div>The southwestern Fennoscandian Shield hosts significant orthomagmatic nickel sulphide deposits linked to pre-Sveconorwegian crustal evolution. This study integrates new U-Pb zircon geochronology, Lu-Hf isotopic data, and whole-rock geochemistry from the Kongsberg Unit of the Sveconorwegian Province to investigate its magmatic and metallogenetic evolution. The results reveal distinct magmatic episodes across the three complexes of the Kongsberg Unit, highlighting notable temporal and isotopic heterogeneity. Magmatism in the Eastern Kongsberg Complex is confined between 1610 ± 11 and 1524 ± 11 Ma, coeval with igneous activity during the Gothian orogeny and consistent with an arc-related tectonic setting. Meanwhile, the Western Kongsberg Complex records younger, more juvenile magmatism between 1528 ± 9 and 1153 ± 3 Ma. In contrast, the intervening Modum Complex represents extensional basin development with sedimentation &lt; 1475 Ma and juvenile mafic magmatism between 1305 ± 8 Ma and 1185 ± 12 Ma. Nickel sulphide mineralisation, including the Ertelien (1584 ± 19 Ma) and Langedal (1546 ± 2 to 1524 ± 11 Ma) deposits in the Eastern Kongsberg Complex, predominantly correlates with Gothian magmatism, whereas deposits in the Western Kongsberg Complex, such as Grågalten (1164 ± 13 Ma), are linked to later magmatic events. A pronounced westward-younging trend in zircon U-Pb crystallisation ages and Hf model ages supports a dynamic lithospheric evolution driven by long-lived crustal extension and subsequent Sveconorwegian orogenic assembly. Additionally, widespread platinum group element (PGE) depletion across the province suggests a pyroxenitic mantle source, rather than repeated sulphide extraction during magmatic differentiation. These findings emphasise the critical role of pre-Sveconorwegian lithospheric architecture and mantle source characteristics in controlling nickel sulphide mineralisation, offering valuable insights for future exploration strategies in the region.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"427 ","pages":"Article 107836"},"PeriodicalIF":3.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of TTG gneisses from the Liaodong Bay Depression, Bohai Sea Basin: implications for the late Neoarchean tectonic evolution of the eastern North China Craton","authors":"Kuizhou Li ,&nbsp;Haifeng Yang ,&nbsp;Chris Yakymchuk ,&nbsp;Zilin Zhao ,&nbsp;Qingbin Wang ,&nbsp;Peng Xu ,&nbsp;Fuhao Xiong ,&nbsp;Min Deng ,&nbsp;Mingcai Hou no","doi":"10.1016/j.precamres.2025.107832","DOIUrl":"10.1016/j.precamres.2025.107832","url":null,"abstract":"<div><div>Late Neoarchean tonalitic–trondhjemitic–granodioritic (TTG) gneisses are extensively distributed across the North China Craton (NCC), providing crucial information in understanding the tectonic evolution of the region. However, the late Neoarchean to early Paleoproterozoic basement of the offshore Bohai Sea Basin (OBSB), a segment of the NCC, is extensively buried beneath Paleozoic to Cenozoic strata and submerged beneath marine waters, resulting in a poorly understood tectonic evolution history of this region. Here, we report new zircon U–Pb–Hf isotopic data, and whole-rock compositions for TTG gneisses from the Liaoxi Rise of Liaodong Bay Depression (LBD) of the OBSB in the northeastern NCC. The TTG gneisses are classified into two groups: the first group (ca. 2.57–2.52 Ga) is characterized by low MgO (0.2–1.05 wt%), and low REE (31.04–84.58 ppm), Cr (2.38–29.08 ppm), and Ni (7.52–16.07 ppm), and zircon ε_Hf(t) values are predominantly positive from +1.01 to +4.15, indicating that they originated from partial melting of mafic crust. In contrast, the second group (ca. 2.52–2.50 Ga) exhibits higher MgO (1.92–3.56 wt%), elevated REE (51.28–375.91 ppm), Cr (21.17–196.84 ppm), and Ni (31.23–70.16 ppm) concentrations, and also have positive zircon ε_Hf(t) values (+1.14 to +3.86), suggesting a petrogenetic origin involving the melting of oceanic crust with the incorporation of partial mantle material. Both groups of samples show characteristics consistent with a subduction-related tectonic setting. Integrated with ca. 2.50–2.46 Ga K-rich granitoid rocks and coeval mafic dykes, which formed in a subduction-related back-arc extensional setting within the study area, we propose that the Liaodong Bay Depression experienced subduction and followed by back-arc extension between ca. 2.57 Ga and ca. 2.46 Ga. This funding is consistent with the widespread late Neoarchean magmatic-metamorphic events documented across the NCC, which played a pivotal role in the stabilization and maturation of the continental crust.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"427 ","pages":"Article 107832"},"PeriodicalIF":3.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comment on “Debunking the myth of a single Iron Ore Group in the Singhbhum Craton, India” by Jodder et al., 2025 (Precambrian Res., 423, 107800)","authors":"Jordan K. Wright ,&nbsp;Asish R. Basu","doi":"10.1016/j.precamres.2025.107856","DOIUrl":"10.1016/j.precamres.2025.107856","url":null,"abstract":"","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107856"},"PeriodicalIF":3.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An 807–763 Ma continental arc records crust-mantle interaction in the Erguna Block during the breakup of Rodinia","authors":"Ke Wang ,&nbsp;Yilong Li ,&nbsp;Wenjiao Xiao ,&nbsp;Haitian Zhang ,&nbsp;Xiujuan Bai ,&nbsp;Jianping Zheng ,&nbsp;Fraukje M. Brouwer","doi":"10.1016/j.precamres.2025.107833","DOIUrl":"10.1016/j.precamres.2025.107833","url":null,"abstract":"<div><div>Circum-Rodinia subduction-related magmatism provides important insights into the evolution of orogens that formed at the margins of the Rodinia supercontinent. However, the nature of the magma sources and geodynamic processes remain enigmatic. In this paper, we present a systematic study of the petrology, whole-rock geochemistry and geochronology of Neoproterozoic potassium-rich mafic and granitic intrusions from the Erguna Block in northeast China. The granitic intrusions include quartz monzonite and monzogranite and belong to the high-K calc-alkaline to shoshonite series. The quartz monzonite has a zircon U-Pb age of 807 ± 3 Ma with εHf_(t) values of −0.50 to + 4.06 and was derived from low degree partial melting of amphibolites. The monzogranite has a zircon U-Pb age of 792 ± 3 Ma with εHf_(t) values of + 0.82 to + 4.64 and was generated from fractional crystallization of high-K calc-alkaline gabbroic magma. The mafic intrusions are hornblende gabbros with a zircon U-Pb age of 763 ± 6 Ma, εHf_(t) values of −9.19 to + 9.18, and an enriched mantle source. Together with existing data, we identify two stages of potassium-rich mafic magmatism at 792 Ma and 763 Ma, whose primary melts were produced by partial melting of mélange diapirs formed by the subducted sediments mixed with a pyroxenite source at depths of 79–72 km and a peridotite source at 71–66 km, respectively. The 807–763 Ma potassium-rich magmatic rocks in the Erguna Block suggest the presence of a mature continental arc. Oceanic subduction supported an orogen along the northwest margin of Rodinia during its breakup, and was responsible for significant mantle heterogeneity, juvenile crustal accretion and reworking of ancient crust.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107833"},"PeriodicalIF":3.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tonian rift sedimentation and granitic gneiss in the North Lhasa terrane, Tibet: A refined Neoproterozoic tectonic evolution model and its implications for paleogeography","authors":"Ning Yang ,&nbsp;Pei-yuan Hu ,&nbsp;Qing-guo Zhai ,&nbsp;Guo-chun Zhao ,&nbsp;Yue Tang ,&nbsp;Yi-ming Liu","doi":"10.1016/j.precamres.2025.107834","DOIUrl":"10.1016/j.precamres.2025.107834","url":null,"abstract":"<div><div>The Neoproterozoic paleogeographic affinity and basement characters of the Lhasa terrane remain enigmatic, constraining further understanding of the global supercontinent reconstruction. Here, an integrated petrological, geochronological, geochemical, and Sr-Nd-Hf isotopic study was undertaken on the newly discovered Tonian granitic gneisses in the Lhasa terrane. The granitic gneisses (ca. 855–844 Ma) show affinities to A-type granitoids and have positive zircon ε_Hf(t) (+3.1 to + 8.3) and whole-rock ε_Nd(t) (+4.0 to + 4.8) values. Their protoliths were probably generated by the partial melting of Mesoproterozoic crustal rocks. The U-Pb age data of detrital zircons from the biotite plagioclase gneisses associated with the granitic gneisses are also reported. The depositional age of the protoliths of the biotite plagioclase gneisses is constrained to be between the ages of the oldest intrusion body (ca. 855 Ma) and the youngest detrital zircon (ca. 917 Ma) therein, and their detrital zircon age distribution suggests a divergent tectonic setting. Integrating previous studies with the data presented in this contribution, we recommend that the northern Lhasa terrane experienced three Neoproterozoic tectonic stages: rift (ca. 930–850 Ma), subduction (ca. 850–650 Ma), and collision (ca. 650–610 Ma), which suggest an African paleogeographic affinity.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107834"},"PeriodicalIF":3.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2115 Ma Haicheng Igneous Province unveils extensive plume-lithospheric interaction during the Great Oxidation event (GOE)","authors":"Bisheng Xu ,&nbsp;Peng Peng ,&nbsp;Chong Wang ,&nbsp;Ke Dai ,&nbsp;Xu Liu ,&nbsp;Binghe Li","doi":"10.1016/j.precamres.2025.107829","DOIUrl":"10.1016/j.precamres.2025.107829","url":null,"abstract":"<div><div>The 2115 Ma Haicheng Igneous Province (HIP) distributes across the Eastern North China Craton. As one representative large igneous provinces coincident with the Great Oxidation Event (GOE), it is important to know whether such an igneous province is plume-originated or not. Synthetic petrology, geochronology and geochemistry study on the plumbing system of the HIP, especially the mafic sills in the Fanhe-Liaohe basins are performed to seek further constraints. The sills intruding the carbonates of the Sanchazi Group (2.2–2.1 Ga) in the Fanhe basin have thicknesses of about 20 m. They mainly consist of clinopyroxene, plagioclase, and minor Fe-Ti oxides, with greenschist-faices metamorphic overprinting of actinolite/chlorite, albite and quartz, as well as secondary epidote and uralite. Precise Pb-Pb SIMS dating of baddeleyite from the Yunpangou sill, the one with the highest MgO content identified by this study in the Fanhe basin, yields a ²⁰⁷Pb/²⁰⁶Pb average age of 2115 ± 6 Ma, which is the same as others of the HIP. The Yunpangou sill is doleritic and tholeiitic, with low SiO₂ content (44.8–48.2 wt.%) but high MgO (5.3–10.9 wt.%), TFe₂O₃ (total iron: 16.0–19.7 wt.%) and TiO₂ contents (2.0–2.8 wt.%). It shows slightly enriched trace elements, distributed within patterns of E-MORB and OIB. Its Sr-Nd isotopes are quite primitive (⁸⁷Sr/⁸⁶Sr_(t) = 0.702–0.703; ε_Nd(t) = +2.7–+3.4). However, its dramatically varying internal compositions comprise an inverted C-shaped pattern, in which the samples with the highest MgO (8.0–11.0 wt.%) in the center represent the least differentiated component. Its high-Mg content, OIB-affinitive patterns and primitive Sr-Nd isotopes favor a plume source. The mafic units of the HIP show wide compositional variations, with SiO₂ of 45.8–55.5 wt.%, ⁸⁷Sr/⁸⁶Sr_(t) of 0.702–0.709, and ε_Nd(t) of −2.8-+3.9; while the felsic units with SiO₂ of 63.0–80.0 wt.%, ⁸⁷Sr/⁸⁶Sr_(t) of 0.707–0.73, and ε_Nd(t) of -1.5–-0.7. These largely varied compositions and the bimodal feature are resulted from the involving of different melts from sub-continental lithospheric mantle, a paleo-plume, as well as the crust. The HIP represents an extensive plume-lithospheric interaction across much of the craton during the late-stage of GOE.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107829"},"PeriodicalIF":3.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectonostratigraphy of the Ediacaran Fara Formation of the Central Oman Mountains (Jabal Akhdar, Sultanate of Oman): implications for the Late Neoproterozoic evolution of the Eastern Arabian Plate","authors":"Ivan Callegari ,&nbsp;Andreas Scharf ,&nbsp;Andre F. Pinto ,&nbsp;Frank Mattern ,&nbsp;Rajat Mazumder ,&nbsp;Debasmita Datta ,&nbsp;Heninjara Rarivoarison","doi":"10.1016/j.precamres.2025.107825","DOIUrl":"10.1016/j.precamres.2025.107825","url":null,"abstract":"<div><div>In the western Jabal Akhdar Dome of northeastern Oman and within the Neoproterozoic Huqf Supergroup, well-exposed sedimentary formations span the Cryogenian to Ediacaran periods. These rocks bear the marks of the distant Cadomian Orogeny. Among these formations, the youngest corresponds to the diverse Ediacaran Fara Formation, partly time-equivalent to the Ara Group in the subsurface of Oman. Our study extensively examined the Fara Formation’s lithologies, stratigraphy, and syndepositional deformation features to shed light on the Late Ediacaran geological evolution of eastern Arabia. Through meticulous analysis, several key findings and confirmations of previous research emerged from our investigation: (1) the Fara Formation can be categorized into three distinct members (in ascending vertical succession FA1, FA2 and FA3); (2) while FA1 and FA2 members display signs of Cadomian D1 deformation, FA3 Member does not show any evidence of D1 deformation; (3) the first description of the fossil Palaeopascichnus assigns an Ediacaran age to the entire Fara Formation; (4) the volcaniclastic rocks within the Fara Formation are geochemically similar to Hormuz’s volcanics from the same period; and (5) carbonates and siliciclastic rocks of FA1 and FA2 formed within a probably NW/SE-striking back-arc basin associated with Cadomian subduction, while FA3′s siliciclastic rocks unconformably overlie the latter members.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107825"},"PeriodicalIF":3.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis and geochronology of the granulite facies gneissic suite hosting the Katanning Gold Deposit, Yilgarn Craton, Southwest Western Australia","authors":"Luke J. Heseldell ,&nbsp;Nicholas E. Timms ,&nbsp;Hugo K.H. Olierook ,&nbsp;Thomas E. Smail ,&nbsp;Chris Clark ,&nbsp;Graham Conner ,&nbsp;Sean Makin","doi":"10.1016/j.precamres.2025.107803","DOIUrl":"10.1016/j.precamres.2025.107803","url":null,"abstract":"<div><div>Understanding the formation of high metamorphic grade sequences from Archean Cratons is necessary for modelling Craton formation and evolution. In this study, we undertake a detailed review of the 1.28 Moz Au Katanning Gold Deposit granulite-facies host sequence, located in the southwestern Yilgarn Craton, Western Australia. To elucidate the nature of this granulite-facies gold deposit, a detailed geochemical, petrographic, and geochronological investigation was undertaken of its host gneissic sequence to establish a petrogenetic model of its formation. The high-grade metamorphic rocks that host gold mineralisation at the Katanning Gold Deposit can be divided into nine major lithological associations. These rocks are interpreted as mafic to felsic protoliths resembling modern BADR sequences which is consistent with extensional magmatism in a back arc setting. Zircon U-Pb dating yielded magmatic ages of a felsic and mafic gneiss at 2711 ± 4 Ma and 2703 ± 3 Ma, respectively, which are contemporaneous with the latest Archean volcanic events in the western Yilgarn Craton. The U-Pb ages of metamorphic zircon across four samples yielded a combined age of 2651 ± 2 Ma, interpreted as the time of peak metamorphic conditions of ∼700–900 °C and ∼5–7 kbar for the entire sequence. Indicating rapid (c. 30 Myr) burial, marked by the maximum depositional age of a metasedimentary gneiss (2683 ± 8 Ma) to granulite facies metamorphism, potentially implicating inversion of a closed back arc rift. This study provides a regional context for tectonic evolution of the southwestern Yilgarn Craton, reflecting on the role of high-grade metamorphism in Archean Cratons, and serves as a rare, detailed investigation into a large granulite-facies gold deposit.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"426 ","pages":"Article 107803"},"PeriodicalIF":3.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}