Precambrian Research最新文献

{"title":"Early Paleoproterozoic mafic to felsic magmatism from the Cuoke Complex, South China: Implications for the early tectonic evolution of the southwestern Yangtze Craton","authors":"Jibiao Zhang , Xiaozhong Ding , Yanxue Liu , Heng Zhang , Peiwen Liu , Chenglong Shi","doi":"10.1016/j.precamres.2025.107769","DOIUrl":"10.1016/j.precamres.2025.107769","url":null,"abstract":"<div><div>The early Paleoproterozoic architecture and tectonic evolution of the Yangtze Craton in present-day southern China remain poorly understood due to the limited outcrops of rocks from this period. The recently discovered Cuoke Complex in the southwestern Yangtze Craton preserves numerous early Paleoproterozoic igneous rocks, providing a valuable opportunity to investigate the early evolution of the Yangtze Craton. On the basis of lithological features, magmatic zircon U–Pb–Lu–Hf isotopes, and whole-rock geochemical characteristics, four main lithological assemblages have been identified, and their petrogeneses have been revealed. (1) The ca. 2.36 Ga monzogranites have low Zr + Nb + Ce + Y contents (155–267 ppm), high A/CNK ratios (1.14–1.42), and low 10,000*Ga/Al ratios (1.66–2.50), which are typical of S-type granites. These monzogranites display negative whole-rock ε<sub>Nd</sub>(t) (−4.7 to −7.6) and zircon ε<sub>Hf</sub>(t) values (−2.4 to −4.8) and high CaO/Al<sub>2</sub>O<sub>3</sub> (0.01–0.08) and CaO/Na<sub>2</sub>O ratios (0.04–0.32), suggesting that they formed through the remelting of ancient pelites. (2) The ca. 2.33 Ga diorites are characterized by high Sr contents (556–619 ppm), high Sr/Y (63.0–83.1) and (La/Yb)<sub>N</sub> ratios (24.7–28.1), and low Y (7.45–9.17 ppm) and Yb (0.94–1.11 ppm) contents; thus, these rocks resemble adakites. The elevated Mg<sup>#</sup> values (46–56), high Cr (106–125 ppm) and Ni (38.9–43.9 ppm) contents, and positive ε<sub>Nd</sub>(t) (+2.4 to + 4.2) and ε<sub>Hf</sub>(t) values (+1.4 to + 8.4) indicate that these rocks originated from the partial melting of a subducted oceanic slab. (3) The ca. 2.32 Ga mafic rocks exhibit typical Nb-enriched basaltic features, with high TiO<sub>2</sub> (2.08–3.94 wt%) and Nb (7.63–16.7 ppm) contents and elevated Nb/Th (4.85–11.7), Nb/La (0.33–0.87), and Nb/U (13.4–32.1) ratios. The rocks have decoupled Nd–Hf isotopes with relatively low whole-rock ε<sub>Nd</sub>(t) (+2.1 to + 3.6) values and relatively high zircon ε<sub>Hf</sub>(t) (+2.2 to + 9.0) values, suggesting that they were derived from a mantle wedge modified by slab-derived adakitic melts. (4) The ca. 2.32 Ga granites display high Zr + Nb + Ce + Y contents (451–522 ppm), high 10,000*Ga/Al (2.58–2.69), Y/Nb (1.32–1.94), and Yb/Ta ratios (1.09–1.89), and significantly negative Eu, Ba, Sr, and Ti anomalies, indicating an affinity with A<sub>2</sub>-type granites. The peraluminous features (A/CNK = 1.05–1.24) and negative whole-rock ε<sub>Nd</sub>(t) (−2.9 to −5.5) values and zircon ε<sub>Hf</sub>(t) values (−2.1 to −5.1) suggest that these rocks formed through the partial melting of ancient metasedimentary rocks. Considering previous geochronological and geochemical studies of other ancient complexes within the Yangtze Craton, we propose that the ca. 2.36 Ga monzogranites were most likely generated in a <em>syn</em>-collisional setting, whereas the ca. 2.34–2.32 Ga adakites, Nb-enriched mafic rocks, and","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"422 ","pages":"Article 107769"},"PeriodicalIF":3.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683741","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":"Revisiting the formation ages of Tangjiazhuang Group: Insights from new U-Pb zircon ages in TTG gneisses of the Jiaobei terrane, North China Craton","authors":"Rucheng Zhang ,&nbsp;Lei Zhao ,&nbsp;Mingguo Zhai ,&nbsp;Ross N. Mitchell","doi":"10.1016/j.precamres.2025.107773","DOIUrl":"10.1016/j.precamres.2025.107773","url":null,"abstract":"<div><div>The Jiaobei terrane is a typical and representative early Precambrian terrane of the North China Craton (NCC) characterized by extensively metamorphosed supracrustal rocks. These supracrustal units are of great importance for deciphering the NCC’s tectonic evolution, mineralization processes, and environmental responses during the early Earth. However, the distribution of Archean supracrustal rocks in the Jiaobei terrane is not as extensive as in other parts of the NCC. Despite the most commonly used classification of the Archean supracrustal rocks in the Jiaobei terrane into the Mesoarchean Tangjiazhuang Group and the Neoarchean Jiaodong Group, the precise formation age of the Tangjiazhuang Group has remained elusive. Addressing this gap, this study introduces new zircon U–Pb geochronological insights from TTG (Tonalite-Trondhjemite-Granodiorite) gneisses that intruded the Tangjiazhuang Group. The analyzed zircons predominantly exhibit magmatic cores with metamorphic overgrowth rims, indicative of complex geological processes. Our findings reveal two distinct age groups at 2794 ± 27 Ma and 1914 ± 36 Ma, corresponding to the intrusion of TTG gneisses during the late Mesoarchean and their subsequent metamorphism in the Paleoproterozoic, respectively. They were later intruded by the Paleoproterozoic granitic gneiss at 2194 ± 16 Ma. Combined with field observation and previous studies, the new age data definitively suggest that the Tangjiazhuang Group was formed by at least the late Mesoarchean, thereby offering crucial refinements to the temporal framework for the early crustal formation and evolution of the NCC. The lack of continent-derived components (pelitic rocks) in this lithological unit implies submerged environment for the Mesoarchean Jiaobei terrane of the eastern NCC.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"422 ","pages":"Article 107773"},"PeriodicalIF":3.2,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687704","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":"Review of Paleoproterozoic tectonics in the southern West African Craton: Insights from multi-disciplinary data integration","authors":"Julien Perret ,&nbsp;Mark W. Jessell ,&nbsp;Quentin Masurel ,&nbsp;Patrick C. Hayman ,&nbsp;Nicolas Thébaud ,&nbsp;Lenka Baratoux ,&nbsp;Alain Kouamélan ,&nbsp;Aurélien Eglinger ,&nbsp;Anne-Sylvie André-Mayer ,&nbsp;Augustin Y. Koffi ,&nbsp;Ibrahima Dia ,&nbsp;Jacques Koné ,&nbsp;James Davis ,&nbsp;Ousmane Wane ,&nbsp;Prince O. Amponsah ,&nbsp;Seta Naba ,&nbsp;Oliver Vanderhaeghe","doi":"10.1016/j.precamres.2025.107707","DOIUrl":"10.1016/j.precamres.2025.107707","url":null,"abstract":"<div><div>For over a century, research has focused on the southern West African Craton (sWAC), aiming to unravel its lithological, geochemical, geochronological, structural, metamorphic, and metallogenic record. Yet, the late Siderian to early Rhyacian (c. 2350–2265 Ma) geodynamic setting of the sWAC remains poorly constrained due to (i) the unresolved configuration of adjacent Archean blocks; (ii) limited geochronological data for the lowermost stratigraphic units; and (iii) extensive overprinting by subsequent magmatic, tectonic, and thermal events. Using a multidisciplinary data integration approach, it is however possible to conduct the analysis of tectonic processes governing the emplacement of the Paleoproterozoic granite-greenstone belts of West Africa.</div><div>In this review, we integrate all available published datasets and knowledge to provide new insights on the late Siderian to Rhyacian tectonic evolution of the sWAC. This data compilation is presented and discussed in the form of key time slices (c. 2350–2265 Ma, 2265–2200 Ma, 2200–2135 Ma, 2135–2120 Ma, 2120–2095 Ma and 2095–2060 Ma), which mark evolutionary stages in the geological history of the region. The results of our analysis support the shift from enigmatic Archean tectonic modes to plate tectonics, with the onset of subduction at c. 2265 Ma.</div><div>However, critical knowledge gaps remain, particularly regarding the tectonic significance of greenstone belts and the role of the West African Craton in potential configurations of the Eburnean–Transamazonian Orogen during the assembly of Nuna. To address these issues, future research directions are proposed to conclude this synthesis.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"422 ","pages":"Article 107707"},"PeriodicalIF":3.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"TTG petrogenesis and U–Pb SHRIMP zircon geochronology constraints on the tectonic regime and formation of the Mesoarchean crust from the Ourilândia–Tucumã area in the Carajás Province, Amazonian Craton, Brazil","authors":"Yury Harrison da Costa Reis ,&nbsp;Davis Carvalho de Oliveira ,&nbsp;Luana Camile Silva-Silva ,&nbsp;Williamy Queiroz Felix ,&nbsp;Bhrenno Marangoanha ,&nbsp;Marco Antônio Galarza ,&nbsp;José de Arimatéia Costa de Almeida","doi":"10.1016/j.precamres.2025.107767","DOIUrl":"10.1016/j.precamres.2025.107767","url":null,"abstract":"<div><div>Tonalite–trondhjemite–granodiorite (TTG) magmatism marked crucial episodes in early crustal growth and cratonization worldwide; petrogenetic processes, tectonic configurations, and sources of TTGs are the focus of continuous debate. Here, we present a geochemical and geochronological (zircon U–Pb SHRIMP) study of TTG granitoids to determine their petrogenesis and to better constrain the crustal evolution of Carajás Province. New evidence of preserved TTG crust in the Ourilândia–Tucumã area, which is composed of tonalite–trondhjemites, is presented. The tonalite has an emplacement age of 3.0 Ga. These rocks are consistent with low- and medium- to high-pressure TTGs. Our modeling of the sources that gave rise to these TTGs revealed that the origin of the trondhjemites was related to the 13 % partial melting of an amphibolite/eclogite source at high pressure (approximately 1.5 GPa) in the garnet/rutile stability zone. The tonalite data also suggest 16–22 % partial melting of a metabasaltic crust at medium–low pressures (approximately 1.0 GPa), with little or no influence from garnet in the residue. The source had an affinity with the metabasalts in the greenstone belt sequence of the Tucumã–Gradaús Group. The proposed geodynamic setting of the Carajás Province TTG crust evolved from stagnant lid tectonics to mobile lid tectonics. Drip tectonics occurred over 30–50 Ma, aborted low-angle subduction began to occur, and as the crust became thicker and more resistant, increasingly steep subduction occurred.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"422 ","pages":"Article 107767"},"PeriodicalIF":3.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683742","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":"P-T path of staurolite-bearing metapelitic schist from the Taihua Complex, southern Trans-North China Orogen, and tectonic implications","authors":"Xinyue Han ,&nbsp;Laixi Tong ,&nbsp;Zhao Liu ,&nbsp;Chao Li ,&nbsp;Mingguo Zhai ,&nbsp;Jiali You ,&nbsp;Feng Zhou ,&nbsp;Kexin Wu ,&nbsp;Xiaoping Long ,&nbsp;Yue Gao","doi":"10.1016/j.precamres.2025.107754","DOIUrl":"10.1016/j.precamres.2025.107754","url":null,"abstract":"<div><div>The Taihua Complex, located on the southern margin of the Trans-North China Orogen (TNCO), North China Craton, is a critical region for decoding tectonic evolution of the TNCO. In this study, an integrated investigation of petrology, phase equilibrium modelling and LA-ICP-MS zircon U-Pb dating is undertaken for the staurolite-bearing metapelitic schist in the Lushan Taihua Complex. Petrographic observations reveal a four-stage metamorphic evolution, including: (1) A pre-peak (M1) assemblage consisting of the garnet core and its mineral inclusions of staurolite, plagioclase, biotite, quartz, ilmenite and rutile; (2) The pressure peak (M2) assemblage represented by the inclusions of plagioclase, biotite, quartz, ilmenite and rutile within garnet rims, and the presence of kyanite pseudomorphs after sillimanite, which is confirmed by the Raman spectra; (3) The decompression stage (M3) characterized by the transformation from kyanite to sillimanite as well as partial replacement of rutile by ilmenite; and (4) the final stage (M4) marked by the fine-grained assemblage of biotite + plagioclase + quartz ± sillimanite, locally surrounding the garnet porphyroblasts. Phase equilibrium modelling results suggest that the metapelitic schist experienced the high-amphibolite facies metamorphism, with <em>P-T</em> conditions approaching 654 ∼ 661℃/8.7 ∼ 9.1kbar (M1) and 751 ∼ 766 ℃/10.7 ∼ 11.1 kbar (M2), followed by a decompression with minor heating to 778 ∼ 795 ℃/7.2 ∼ 7.9 kbar (M3), and finally, the rocks underwent a cooling process until 699 ∼ 702 ℃/7.1 ∼ 7.2 kbar (M4). Thus, a clockwise <em>P-T</em> path is retrieved. Zircon U-Pb dating yields a weighted mean ²⁰⁷Pb/²⁰⁶Pb age of 1883 ± 9 Ma, interpreted as the time of the post-peak cooling. Therefore, it can be inferred that the Taihua Complex has been involved in the collision between the Western and Eastern Blocks of the NCC in the late Paleoproterozoic. Based on previously published data, we propose that the Taihua Complex records the pressure peak metamorphic ages of ca. 1.95 Ga and cooling ages of ca. 1.93(1.92) ∼ 1.80 Ga. The main crustal thickening process possibly occurs at ca. 1.95 Ga, followed by uplifting, and final cooling from ca. 1.93(1.92) − 1.80 Ga.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107754"},"PeriodicalIF":3.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629074","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":"The helically coiled microfossil Obruchevella from the upper Ediacaran Miaohe Member in South China","authors":"Qin Ye ,&nbsp;Zhihui An ,&nbsp;Shuhai Xiao ,&nbsp;Sishuo Chen ,&nbsp;Xinghua Chen ,&nbsp;Mingxin Liu","doi":"10.1016/j.precamres.2025.107764","DOIUrl":"10.1016/j.precamres.2025.107764","url":null,"abstract":"<div><div>Exceptionally preserved fossils from Precambrian strata are crucial for our understanding of the origin and evolution of early life on Earth. Some of them (e.g., <em>Obruchevella</em>) are comparable with extant forms in cellular morphology, indicating remarkable evolutionary conservatism or morphological convergence. Here we describe abundant and exceptionally preserved specimens of <em>Obruchevella</em> from the upper Ediacaran Miaohe Member in South China. The new specimens are characterized with a helical filament, a diagnostic feature of the genus <em>Obruchevella</em>, but many of them also have an elongate, axially arranged, rod structure. The axial rod is probably a taphonomic artifact, although we also consider its possible biological origin. Should the axial rod be proven as biological in origin, it may represent a previously undocumented component of <em>Obruchevella</em>, or an organism distinct from but symbiotically associated with <em>Obruchevella</em>. These uncertainties highlight the challenges in distinguishing taphonomic and biological structures in Precambrian microfossils despite their exceptional preservation. Regardless, the new microfossils provide new taphonomic and morphological insights into <em>Obruchevella</em>, which is considered as a morphological analog of the modern cyanobacteria <em>Spirulina</em> and <em>Arthrospira</em>. They also enrich the microfossil diversity of the Miaohe Member, which is better known for macroscopic carbonaceous compression fossils.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107764"},"PeriodicalIF":3.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628993","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":"Archean to early Mesoproterozoic crustal evolution of the Yangtze Craton: Insights from U-Pb-Hf-O isotopic and trace elemental compositions of detrital zircon","authors":"Xinyu Cai ,&nbsp;Rui Li ,&nbsp;Guangyan Zhou ,&nbsp;Heng Luo ,&nbsp;Zhifu Liu ,&nbsp;Nimat Ullah Khattak ,&nbsp;Wei Wang","doi":"10.1016/j.precamres.2025.107751","DOIUrl":"10.1016/j.precamres.2025.107751","url":null,"abstract":"<div><div>Detrital zircons from ancient sedimentary rocks provide essential evidence for deciphering the early crustal evolution of Earth, particularly in ancient cratons with limited ancient rock records. The Yangtze Craton in South China has limited exposure of Archean-Paleoproterozoic rocks, while abundant Paleo-Mesoproterozoic sedimentary units in the southwestern Yangtze Craton contains voluminous Archean detrital zircons. In this study, new U-Pb-Hf-O isotopic and trace elements data of detrital zircons and whole-rock elemental data from the Dongchuan and Hekou Groups are conducted. Three distinct detrital zircon age populations at 2.85 ∼ 2.6 Ga, 2.45 ∼ 2.2 Ga, and 2.0 ∼ 1.75 Ga are identified. Almost all zircons exhibit depleted LREEs, enriched HREEs, pronounced negative Eu anomalies, and positive Ce anomalies, suggesting a magmatic origin. The comparison of U-Pb-Hf isotopic data of detrital zircons with magmatic zircons within the Yangtze basement rocks, coupled with the angular morphology of the zircons, collectively suggest that the provenance originates within the Yangtze Craton rather than exotic terranes. At ca. 2.85 Ga and 2.1 Ga, mean δ¹⁸O values of detrital zircons are 5.8 ‰ and 5.5 ‰, respectively, with corresponding median ε_Hf(t) values of + 4.16 and −0.59. Subsequently, the δ¹⁸O values began to increase markedly, whereas ε_Hf(t) values declined during the same interval. Zircon trace element signatures point to their origin in S-type granites linked to orogenic events, with zircon Eu anomalies indicating crustal thickening at 2.85 Ga and 2.1 Ga, which coincides with the evolutionary trends observed in zircon O-Hf isotopes and resonates with supercontinent cycles. Crust growth curve calculations reveal that the growth of continent nuclei in Yangtze Craton can be tracked back to the late Hadean, reaching nearly 80 % of its present volume during the Meso-Neoarchean, with a subsequent decrease in growth rates. This growth pattern aligns with evolution trends of global crust growth curve, indicating a gradual growth and stabilization of continental crust during the Archean period.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107751"},"PeriodicalIF":3.2,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620517","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":"Petrological and geochemical insights into the genesis and geothermal potential of Late Neoarchean granitoid rocks in the Matouying Uplift, North China Craton","authors":"Quan Gan ,&nbsp;Luming Song ,&nbsp;Shuantong Shangguan ,&nbsp;Xiaofei Qi ,&nbsp;Zhiwei Liao ,&nbsp;Jianye Chen ,&nbsp;Zhili Yang ,&nbsp;Guiling Wang ,&nbsp;Guangyao Xin ,&nbsp;Chongyuan Zhang","doi":"10.1016/j.precamres.2025.107763","DOIUrl":"10.1016/j.precamres.2025.107763","url":null,"abstract":"<div><div>The Matouying geothermal area, located in the eastern region of the North China Craton, is a significant site for hot dry rock (HDR) geothermal exploration. However, the petrogenesis and tectonic setting of the granitoid reservoir remain unclear. This study provides a comprehensive analysis of petrographic, geochemical, Sm-Nd isotopic, zircon Hf isotopic, and U-Pb geochronological data from granitoid samples obtained through deep drilling in the Matouying. The granitoid rocks are classified into three distinct groups based on geochemical characteristics. Group #1 samples exhibit high Sr/Y and (La/Yb)_N ratios, along with ε_Hf(t) values ranging from −0.75 to + 3.34 and ε_Nd(t) from −0.39 to + 1.54, suggesting they were similar to adakitic rocks which originated from partial melting of juvenile subducted oceanic crust. Group #2 samples show weaker LREE/HREE fractionation, LILE enrichment and HFSE depletion (e.g., Nb, Th, Ti), accompanied by negative Eu anomalies. Isotopic data reveal more negative ε_Hf(t) (−8.87 to −4.13) and ε_Nd(t) (−2.34 to + 0.40), indicating formation from partial melting of ancient lower crust under low-pressure conditions. Group #3 samples display variable LREE/HREE fractionation and stronger LILE enrichment, with a smaller degree of depletion in HFSEs compared to Group #1, and show weaker or no Eu anomalies. Isotopic analyses show ε_Hf(t) values from −6.02 to −2.99 and ε_Nd(t) from −14.10 to −4.90, suggesting medium-pressure partial melting of ancient lower crust. Zircon U-Pb dating yields ages of 2495–2502 Ma for Group #1, 2514 Ma for Group #2, and 2534 Ma for Group #3, indicating their formation during the Late Neoarchean (∼2.5 Ga) in a subduction-related arc. The calculated heat generation rates for the Matouying reservoir range from 0.40 to 2.11 μW/m³, with an average arithmetic value of 0.84 μW/m³, indicating a relatively subdued radiogenic heat production potential for geothermal sources. Instead, cumulative evidence suggests that heat derived from the mantle, potentially sourced from deep-seated magma chambers, is the primary contributor. This contribution offers a rational understanding on the HDR reservoir mechanism in Matouying from petrological and geochemical aspects, aiding geothermal potential assessment and estimation.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107763"},"PeriodicalIF":3.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594065","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":"Eoarchean to Paleoproterozoic crustal growth and evolution of the southern North China Craton revealed by detrital zircon in the Paleoproterozoic Songshan Group","authors":"Bowen Si ,&nbsp;Chunrong Diwu ,&nbsp;Rongjun Si","doi":"10.1016/j.precamres.2025.107752","DOIUrl":"10.1016/j.precamres.2025.107752","url":null,"abstract":"<div><div>Precambrian continental crust is window into Earth’s early history. The North China Craton (NCC) is one of the key regions worldwide to investigate the continuous crustal growth mechanism during early Earth. The Songshan Group is one of the best-preserved Paleoproterozoic sedimentary strata in the southern NCC, which is an ideal target to reveal the Precambrian continental crustal growth and evolution. However, the Songshan Group has received limited scientific scrutiny, both its depositional time and tectonic setting have not been well constrained. In this study, we present U-Pb detrital zircon ages and Hf-in-zircon isotopic data from sedimentary rocks of the Songshan Group. Based on the youngest single cluster of detrital zircons and the intrusion ages of Paleoproterozoic mafic dykes, the depositional age of the Songshan Group is constrained to the period of ca. 2.20–2.00 Ga. Rutiles from the two quartzite samples define lower intercept U-Pb ages of 1922–1912 Ma, suggesting the Songshan Group had undergone the final assembly of the NCC. U-Pb age spectra of the detrital zircons from the Songshan Group show multi-stage age clusters at ca. 3.84–3.33, 3.03–2.80, 2.80–2.60, 2.60–2.43 and 2.41–2.13 Ga, with two distinct peaks at ca. 2.70 and 2.52 Ga. The Precambrian basement in the southern NCC likely served as a proximal source for the clastics of the Songshan Group. The geochemical characteristics of detrital zircons indicate that they are derived from continental granitoid in a continental arc setting. Based on the sedimentology, provenance, geochronology, and geochemistry of the Songshan Group, we conclude that the group was deposited in a retroarc foreland basin during the period between ca. 2.20 and 2.00 Ga, which was positioned between an “Andean-type” continental margin arc and the Eastern Block. The U-Pb-Hf isotopic compositions of detrital zircons from the Songshan Group unveil two significant periods of continental crustal growth at ca. 2.95–2.60 and 2.60–2.45 Ga in the southern NCC, while the ca. 2.44–2.03 Ga zircons reveal a major episode of crustal reworking. Trace elements of detrital zircons indicate the increase of continental crustal thickness at ca. 2.80–2.70 and 2.58–2.50 Ga, with a maximum thickness at ca. 2.70 Ga, which are similar to that of modern orogenic belts. During and after the two periods, crustal thickness of the southern NCC was obviously shortened.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107752"},"PeriodicalIF":3.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594066","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":"Coupled Lu-Hf and U-Pb apatite geochronology of Jatobá orebody supports ∼ 2.5 Ga metamorphism in deep shear zones from southern Copper Belt, Carajás Domain, Brazil","authors":"Yuri Tatiana Campo-Rodriguez ,&nbsp;Cristiana L. Ciobanu ,&nbsp;Sarah Gilbert ,&nbsp;Benjamin Wade ,&nbsp;Nigel J. Cook ,&nbsp;Maria Emilia Schutesky ,&nbsp;Kathy Ehrig","doi":"10.1016/j.precamres.2025.107753","DOIUrl":"10.1016/j.precamres.2025.107753","url":null,"abstract":"<div><div>A multi-isotopic geochronological study of apatite (U-Pb, Lu-Hf) in host basalts and mineralization from the Jatobá orebody, Southern Copper Belt, Carajás Domain, Brazil, constrains the age and setting of mineralization. Combined mineral textural relationships from cathodoluminiscence imaging, and compositional and isotopic data from EPMA and LA-ICP-MS, hint at initiation of an iron-oxide-copper–gold system at ca. 2.5 Ga during a deformation event linked to amphibolite facies metamorphism in deep (up to 20 km) shear zones. The ∼ 2.5 Ga Lu-Hf age is obtained from deformed, REE-rich cores of basalt-hosted apatite and is contemporaneous with metamorphism of a volcanic sequence deposited in a rift active during ca. 2.76–2.73 Ga. Some apatite grains retain a mafic, Cl-rich signature, testifying to a primary igneous origin. The Lu-Hf ages stretching from 2527 to 2384 Ma are obtained from apatite displaying textural diversity and geochemical heterogeneity, consistent with a prolonged event featuring dissolution-reprecipitation in response to fluid release during the retrograde cycle. The U-Pb system displays a younger ∼ 2 Ga U-Pb apatite age indicating later re-equilibration. This age corresponds to post-uplift mylonitization of the host sequences. The newly documented ∼ 2.5 Ga age for mineralization in a deposit from the southern Copper Belt is coeval with Cinzento Shear zone reactivation in the northern copper belt, and the ages of deposits like Salobo. Fluid flow along shears leached metals from the Mesoarchean basement, later deposited as sulphides intimately associated with the reworked apatite. We propose deep-rooted connections between mineralizing systems across the region.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"421 ","pages":"Article 107753"},"PeriodicalIF":3.2,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}