Petrology最新文献

{"title":"Newly Identified A-type Granite in Western Yangtze Block and Its Geochemistry Characteristics: Evidence for Ridge Subduction beneath the South China Craton","authors":"Awei Mabi,&nbsp;Yanlong Li,&nbsp;Mingchun Zhang,&nbsp;Zhengxi Yang,&nbsp;Niuben Yu","doi":"10.1134/S0869591123060024","DOIUrl":"10.1134/S0869591123060024","url":null,"abstract":"<p>Numerous Neoproterozoic granitic intrusions occur over a north-south distance of more than 700 km in the western Yangtze Block. In this paper, we use zircon U-Pb age, Lu-Hf isotopic, and whole-rock geochemical data to show that the Shimian granitic pluton, which was previously thought to be S-type granite in the area, is actually A-type granite. The selected fresh samples for this study are mainly porphyritic biotite monzogranites. They are weak peraluminous, A₂-subtype granites, displaying high contents of SiO₂ and K₂O, low CaO, and Na₂O, with the characteristics of high silica, rich potassium, and low sodium. They are enriched in incompatible trace elements, but low in trace elements compatible in mafic silicates and feldspars, and they are chemically characterized by having high REE and Ga abundances and low Al, Ni, Ba, Sr, and Eu abundances. The major and trace element behavior suggests that the granites underwent the process of advanced fractional crystallization and were likely generated by crustal partial melting. Zircon U-Pb age shows the Shimian granitic pluton was emplaced at 728 ± 20 Ma. The studied granites yield an average ¹⁷⁶Hf/¹⁷⁷Hf value of 0.282363 (ε_Hf = 0.8) with a 94% confidence interval of 0.282334 to 0.282384 (ε_Hf = −0.1 to 1.7), indicating that they are derived from the remelting of juvenile continental crust. We suggest that this newly identified A-type granite at Shimian, southwestern China, was more plausibly generated in an extensional setting as a result of slab window caused by ridge subduction, which can account not only for the formation of voluminous granitoids, but also for the basalts, boninitic pillow lavas, and SSZ-type ophiolites in western Yangtze Block.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"31 6","pages":"681 - 704"},"PeriodicalIF":1.5,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sources of Cuprous Sulfide Mineralization and High-Ni Olivine of the Rudnaya Dyke (Imangda Cluster, Norilsk region): Based on Compositional, Isotope and Model Data","authors":"V. D. Brovchenko,&nbsp;I. A. Kirillina,&nbsp;M. A. Yudovskaya,&nbsp;G. Costin,&nbsp;I. V. Pshenitsyn,&nbsp;E. V. Kovalchuk,&nbsp;Yu. O. Larionova,&nbsp;Yu. D. Gritsenko,&nbsp;A. A. Ketrov,&nbsp;S. F. Sluzhenikin","doi":"10.1134/S086959112306005X","DOIUrl":"10.1134/S086959112306005X","url":null,"abstract":"<div><p>The Rudnaya dyke of the Imangda ore cluster is composed of weakly differentiated olivine-bearing to olivine gabbrodolerites with globular and interstitial sulfides of a chalcopyrite–cubanite- (pentlandite-pyrrhotite) composition. Along with sulfide mineralization, gabbrodolerites of the dyke contain xenoliths of hornfelsed basalts, abundant amygdales and rare grains of zoned olivine-1 <i>Fo</i>_90–47 that coexists with subhedral olivine <i>Fo</i>_74–36 of the second generation. Modeling with the COMAGMAT and alphaMELTS programs showed that high-Mg <i>Ol</i>-1 with Cr-spinel inclusions cannot be crystallized from a Fe-enriched tholeiitic melt with 4.8–7.3 wt % MgO and 11.6–16.7 wt % total Fe₂O₃ that is parental for the dyke. The variation trend and high Ni up to 0.5 wt % NiO in the cores of xenocrystic olivine <i>Fo</i>_90–76 in contrast to maximum <i>Fo</i>₈₃ and 0.4 wt % NiO in olivine from the ore-bearing intrusions and picritic basalts of the Norilsk region point toward the presence of deep-seated cumulates of picritic magmas, which had not exchanged with sulfide liquid. Platinum group element (PGE) abundances increase (up to 2.2 ppm) with increasing Cu/Ni in the whole rocks and proportions of pentlandite in a sulfide association. A specific pattern of chalcophile metal distribution with Ni, Os and Ir minima, elevated Cu/Ni (5–15) and Cu/Pd (3200–10 900) along with lower PGE tenor (PGE content in 100% sulfide) of sulfides (2–65 ppm) and Pd content in pentlandite (&lt;175 ppm) compared to those of the ore-bearing intrusions suggest that cuprous sulfide mineralization was not physically captured from highly fractionated sulfide fractions of ore-bearing magmas but is cogenetic with a magma of the dyke. Sulfide saturation, near-simultaneous with fluid saturation and degassing, was achieved in the dyke conduit due to assimilation of sedimentary sulfur and volatiles from Devonian evaporites that is supported by the heavy S isotope composition of dyke’s sulfides with the average δ³⁴S = 14.7 ±1.1‰ (<i>n</i> = 31) close to the values for sulfides from the endocontact zones of the Imangda ore-bearing intrusions hosted by the Devonian sequences. The initial isotopic characteristics of dyke rocks (Sr_i 0.70517–0.70532, ɛNd from –0.4 to 0.8) imply its comagmatic origin with the Norilsk-type intrusions whereas the overall data do not exclude its spatial connection with an upper crustal conduit network of the ore-bearing magmas.</p></div>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"31 6","pages":"624 - 647"},"PeriodicalIF":1.5,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metasomatic Transformation of Amphibolites into Corundum-Bearing Plagioclasites: Zoning and Numerical Model of the Process with Reference to the Unique Khitostrov Corundum Deposit, Fennoscandian Shield","authors":"S. A. Bushmin,&nbsp;A. B. Kol’tsov,&nbsp;Yu. M. Lebedeva,&nbsp;E. V. Savva","doi":"10.1134/S0869591123060061","DOIUrl":"10.1134/S0869591123060061","url":null,"abstract":"<p>The paper presents results of a study of middle crustal (amphibolite-facies level) desilicated rocks exemplified by corundum-bearing plagioclasites developing after metabasites at the unique Khitostrov corundum deposit in the Belomorian–Lapland orogen of the Fennoscandian shield, with emphasis placed onto newly acquired geological data, documentation and analysis of the metasomatic zoning, determination of the <i>P–T</i> conditions of its formation, and a model of the metasomatic process.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"31 6","pages":"604 - 623"},"PeriodicalIF":1.5,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Paleozoic Tectonothermal Evolution of the Khan-Khukhay Metamorphic Complex, Northern Mongolia","authors":"O. P. Polyansky, A. Yu. Selyatitskii, S. V. Zinoviev, A. V. Babichev","doi":"10.1134/s0869591123050041","DOIUrl":"https://doi.org/10.1134/s0869591123050041","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135509130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation Stages and Conditions of Carbonate–Silicate Veins and Their Wall-Rock Aureoles in the Early Proterozoic Complexes of the Belomorian Mobile Belt, Northern Karelia","authors":"I. S. Volkov, V. M. Kozlovskii","doi":"10.1134/s0869591123050077","DOIUrl":"https://doi.org/10.1134/s0869591123050077","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134934825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microprobe Analysis of Titanium in Zircon: an Estimation of Secondary Fluorescence","authors":"A. A. Borisov, S. E. Borisovskiy, A. N. Koshlyakova","doi":"10.1134/s086959112305003x","DOIUrl":"https://doi.org/10.1134/s086959112305003x","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134934822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Updated COMAGMAT-5: Modeling the Effects of Sulfide Precipitation in Parallel to the Crystallization of Alumino-Chromian Spinel","authors":"A. A. Ariskin, K. A. Bychkov, G. S. Nikolaev, G. S. Barmina","doi":"10.1134/s0869591123050028","DOIUrl":"https://doi.org/10.1134/s0869591123050028","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135507358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variations in the Composition of MORB Chilled Glasses from the Mid-Atlantic Ridge, 12°–31° N: Reflection of Compositional Evolution of Parental Melts and the Influence of a Hydrothermal Component","authors":"S. A. Silantyev, A. I. Buikin, A. R. Tshovrebova, V. V. Shabykova, V. E. Bel’tenev","doi":"10.1134/s0869591123050053","DOIUrl":"https://doi.org/10.1134/s0869591123050053","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lower Talnakh Type Intrusions of the Norilsk Ore Region","authors":"S. F. Sluzhenikin, K. N. Malitch, M. A. Yudovskaya, D. M. Turovtsev, T. N. Antsiferova, S. K. Mikhalev, I. Yu. Badanina, N. G. Soloshenko","doi":"10.1134/s0869591123050065","DOIUrl":"https://doi.org/10.1134/s0869591123050065","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleozoic Tensional Intraplate Magmatism and Mantle Evolution in Central Iran Zone: Geochemistry, Nd-Sr Isotope Data of Lamprophyres","authors":"Sara Veysi,&nbsp;Seyed Mohsen Tabatabaei Manesh,&nbsp;Nargess Shirdashtzadeh,&nbsp;José Francisco Santos","doi":"10.1134/S0869591123040082","DOIUrl":"10.1134/S0869591123040082","url":null,"abstract":"<p>A Permian-Triassic lamprophyric magmatism has developed as dyke and subvolcanic intrusions in the northeast of Isfahan Province, in Central Iran, where is so-called the Chahriseh-Bagherabad area. These rocks mainly consist of olivine, pyroxene, amphibole, and biotite as major minerals and apatite, biotite, muscovite, and opaque as minor minerals with porphyritic texture and with felsic xenoliths and xenocrysts. The Chahriseh-Bagherabad lamprophyres (CBL) magma has undergone significant crustal contamination and fractional crystallization. Based on whole rock geochemistry, these rocks belong to alkaline lamprophyres, derived from a low degree (less than 5%) partial melting of an amphibole-garnet lherzolite mantle and enriched by the lithospheric mantle in the source region. Their ⁸⁷Sr/⁸⁶Sr (0.70435–0.70696) and ¹⁴³Nd/¹⁴⁴Nd (0.51260–0.51276) values were supported by an enriched mantle source of the EMІI-type that has been contaminated by the continental upper crust. Thus, the CBL samples are alkaline rock formed by tensional intraplate magmatism in a Paleo-Tethyan subduction zone in the lower Paleozoic to late Permian in which metasomatism and mantle enrichment occurred. The lamprophyres magmas ascend due to tensional stress during rotation and displacement of the central-eastern Iranian microcontinent.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"31 4","pages":"459 - 474"},"PeriodicalIF":1.5,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4753345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}