Mineralogy and Petrology最新文献

{"title":"Second generation ‘diamond-in-water’ ablation – a step forward in trace element and isotopic composition analysis","authors":"Yaakov Weiss,&nbsp;Gonzalo Guadaño,&nbsp;Janne M. Koornneef,&nbsp;Yael Kempe,&nbsp;Ofir Tirosh,&nbsp;Gareth R. Davies","doi":"10.1007/s00710-025-00896-3","DOIUrl":"10.1007/s00710-025-00896-3","url":null,"abstract":"<div><p>A second generation diamond-in-water laser ablation system combined with mass spectrometry measurements is presented for trace elements and radiogenic isotopic analyses of microinclusion-bearing diamonds. Ablation was conducted using a Nd: YV04 laser (532 nm, 136 µJ/pulse, 25 ns pulse duration, 2000 Hz repetition rate) in a closed ultra-clean glass cuvette filled with milli-Q water (18.2 MΩ cm). Multiple experiments indicate a highly stable and precise ablation process that proceeded at an average rate of 0.75 ± 0.41 mg/h. Triple Quadrupole inductively coupled plasma mass spectrometer (ICP-MS) trace element analyses of the ablated material reveal primitive mantle normalized patterns that are similar to previously analyzed microinclusion-bearing diamonds. Results comparable with previous ablation analyses of individual diamonds, and results of BHVO-2G and BCR-2G standards determined using this new ablation technique confirm its accuracy. Furthermore, the reference material results provide a means to estimate the uncertainty for the elemental concentrations in the diamonds, suggesting that it is generally below 10% for most elements of interest, and likely under 15% for all elements. The new ablation system produces enough material for successful Sr, Nd, and Pb isotope analyses by combined wet-chemistry and thermal ionization mass spectrometer (TIMS) using 10¹¹ or 10¹³ Ω resistors. The Sr–Nd–Pb isotope values of BHVO-2G and BCR-2G ablated, purified using ion chromatography and measured by the same technique validate its accuracy. Low total procedural blank levels (Sr average of 71 ± 21 pg; Nd of 0.42 ± 0.25 pg Nd; Pb of 9.4 ± 3.6 pg) have little impact on the measured isotope values, but a blank correction can be applied if necessary.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 3","pages":"449 - 464"},"PeriodicalIF":1.1,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-025-00896-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167322","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":"Diamonds delivered to the West Coast of southern Africa from erosion of the Kaapvaal-based kimberlites and lamproites","authors":"Michiel C. J. de Wit","doi":"10.1007/s00710-025-00894-5","DOIUrl":"10.1007/s00710-025-00894-5","url":null,"abstract":"<div><p>In the early 1900s diamonds were discovered along the Atlantic coast of southern Africa in Cainozoic alluvial deposits. Most of these were derived from erosion of Mesozoic primary sources on the Kaapvaal Craton. Previous attempts to quantify the amount of diamonds that were eroded from inland lamproites variety Kaapvaal (lamproites vK), and kimberlites varied between 10,000 and 3,000 Mct (million carats). Based on new geomorphological techniques, the post-Gondwana erosion rates and landscape denudation of southern Africa are reviewed. The Early and Middle Cretaceous were peak periods of landscape denudation, which almost coincide with the emplacement of lamproites vK and kimberlites, respectively. This study demonstrates that the eroded lamproites vK and kimberlites, since emplacement, have released 852.7 and 1,336.4 Mct respectively. Assuming that 50% of the carats was lost through breakage during transport and that some 1% was retained in fluvial terraces, it leaves 1,074.6 Mct that were delivered to the West Coast. The palaeo-Orange/Vaal river system has evolved spatially, supplying diamonds via different exit points along the coast. Initially, the transport of diamonds was by the Karoo River delivering some 209.5 Mct eroded from the 120 Ma old lamproites vK to the coast near the present Olifants River. Before the 85 Ma kimberlite event the river outfall to the Atlantic Ocean shifted to the general area of today’s Lower Orange River. This outlet received 865.1 Mct from these Cretaceous lamproites vK and kimberlites, but there are also indications that a small number of diamonds from older primary sources are present.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 3","pages":"433 - 448"},"PeriodicalIF":1.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-025-00894-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167745","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 evolution of uranium mineralization in the Mohuldih deposit, Singhbhum Shear Zone, India: constraints from uraninite and brannerite chemistry","authors":"Sarita Patel,&nbsp;Manoj Kumar Ozha","doi":"10.1007/s00710-025-00889-2","DOIUrl":"10.1007/s00710-025-00889-2","url":null,"abstract":"<div><p>The study reports textures and compositions of uraninite and brannerite from the Mohuldih uranium deposit of the Singhbhum Shear Zone. Three types of texturally varied uraninite are identified: (i) pre-tectonic (U_G−1), (ii) syn to post-tectonic (U_G−2), and (iii) inclusions (U_G−3). Based on UO₂ and PbO composition, these are further divided into five subgroups (U_G−1a, U_G−2a, U_G−1b, U_G−2b, and U_G−3). The negative correlation between the rare-earth elements including Y (ΣREE₂O₃ + Y₂O₃) and UO₂ of U_G−1a and U_G−2a uraninite indicates substitution of REE and Y for U⁴⁺ in the structure of these grains during primary crystallization, whereas U_G−1b and U_G−2b resulted from REE + Y + U-enrichment during secondary fluid-induced alteration. Compositional trends further reveal post-crystallization incorporation of Na, Si, K, Ca, Ti, and Fe, replacing radiogenic Pb in the structure of uraninite. The U-Th-Pb_Total dating of uraninite yields two clusters: older (~ 1.71−1.64 Ga; preserved by U_G−1a and U_G−2a) and younger (~ 0.93 Ga; U_G−1b and U_G−2b). Additionally, the extrapolated best-fit linear trend for uraninite in U_G−3 population preserves chemical dates ranging from ~ 1.71 to ~ 1.64 Ga. The ~ 1.64 Ga represents a U + Y + HREE + Ca + Fe hydrothermal event, resulting in the precipitation of uraninite, followed by dissolution-reprecipitation of the mineral along the grain boundary and fractures at ~ 0.93 Ga. The oldest mesured date (~ 1.71 Ga) is attributed to partial Pb-loss by older uraninite during the ~ 1.64 Ga hydrothermal event, with no evident geological significance in the area. The dissolution-reprecipitation of the early-formed uraninite also resulted in the formation of brannerite and ilmenite during the ~ 0.93 Ga event. </p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 1","pages":"105 - 125"},"PeriodicalIF":1.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826600","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":"Mineralogy, petrogenesis, and SHRIMP U–Pb age of the “Ore Horizon 330” sulfide PGE-Cu-Ni deposit from the Paleoproterozoic layered Monchegorsk pluton, Kola Region, Russia","authors":"Victor V. Chashchin,&nbsp;Yevgeny E. Savchenko,&nbsp;Sergey A. Sergeev","doi":"10.1007/s00710-025-00886-5","DOIUrl":"10.1007/s00710-025-00886-5","url":null,"abstract":"<div><p>The results of a comprehensive study of the Ore Horizon 330 (OH330) sulfide platinum group elements (PGE)-Cu-Ni deposit are presented. OH330 is located within the Sopcha intrusion orthopyroxenites of the layered Monchegorsk pluton (Monchepluton) in the Kola Region (Russia). It is a sill-like body, 3300 m long, 1200 m wide, and 4–6 m thick. The main rock-forming minerals of OH330 were olivine (Fo_87–84) and orthopyroxene (En_84–83). Light rare-earth element (LREE) fractionation is typical for all OH330 rocks, with the (Ce/Sm)_N (where the subscript N indicates normalization to the primitive mantle) values of 1.21 in dunite, 1.33–1.86 in harzburgite, and 1.86–2.15 in orthopyroxenite. The trace elements exhibited positive U and Ta anomalies in dunite and harzburgite and negative Nb and Ta anomalies in orthopyroxenite. The following crystallization parameters of the OH330 rocks were determined: liquidus temperature, 1220 °C; solidus temperature, 1190 °C; and pressure, 2.4 kbar. The SHRIMP (sensitive high-resolution ion microprobe) U–Pb age of magmatic zircon from the OH330 orthopyroxenite is 2492.5 ± 4.1 Ma. This indicates that OH330 was younger than the rocks of the Monchepluton ultramafic subchapter (about 2506 Ma). The calculated parental melt of OH330 has a boninite-like composition with an MgO content of 14 wt% and is contaminated with crustal material. The formation of OH330 occurred as a result of additional magma injection associated with the activation of a mantle diapir. Thus, the OH330 body is probably the ultramafic cumulate part of an intrusion associated with Paleoproterozoic continental rifting.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 1","pages":"49 - 71"},"PeriodicalIF":1.4,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826643","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":"A Russian doll diamond in the making","authors":"Jeff W. Harris,&nbsp;Thomas Stachel","doi":"10.1007/s00710-025-00891-8","DOIUrl":"10.1007/s00710-025-00891-8","url":null,"abstract":"<div><p>The presence of a diamond existing freely in an encasing diamond has invoked origins involving the escape of a gas from that diamond, or the dissolution of an impure diamond layer by melts or fluids, access in the second case, being gained by either the dissolution of diamond along dislocations or by breakage. The find of a diamond in which there is an octahedral garnet shell between two stages of diamond growths discerns a more realistic origin for this rare type of diamond. That origin involves the diamond coming to Earth’s surface, when the garnet partially breaks the outside diamond before being dissolved during the acid cleaning processes prior to diamond evaluation and sale. The inner diamond then moves freely in the cavity created.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 3","pages":"513 - 520"},"PeriodicalIF":1.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161331","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":"A link between enhanced sampling of Ti–rich mantle garnets and superdeep diamonds: Insights from the DO-27 kimberlite, Northern Canada","authors":"Qiwei Zhang,&nbsp;Irina Malakhova,&nbsp;Thomas Stachel,&nbsp;Barrett Elliott,&nbsp;Ingrid Chinn,&nbsp;Michael Seller,&nbsp;Matthew F. Hardman,&nbsp;Bruce Kjarsgaard,&nbsp;D. Graham Pearson","doi":"10.1007/s00710-025-00888-3","DOIUrl":"10.1007/s00710-025-00888-3","url":null,"abstract":"<div><p>Despite the economic significance and scientific value of sublithospheric (superdeep) diamonds, useful indicators of their presence in a kimberlite body via traditional indicator mineral approaches remain elusive. The DO-27 kimberlite on the Slave craton hosts abundant (~ 25%) superdeep diamonds, providing an excellent opportunity to examine this issue. Elemental compositions plus thermobarometry of mantle garnets from DO-27 reveal a high fraction (~ 39%) of high-Ti garnets (classes G1 and G11) predominantly derived from the lowermost lithospheric root (~ 170 to 220 km). High-Ti garnets are significantly more abundant at DO-27 than in other kimberlites from the Slave craton where superdeep diamonds are scarce or absent. New density calculations show G11 garnet bearing peridotites are as buoyant as other parts of the lithosphere. Our model invokes the transport of superdeep diamonds to the base of the lithosphere via buoyant, deeply subducted harzburgites rising from transition zone depths. Once accreted to the lithosphere, these protoliths become re-fertilised by Ti–rich asthenosphere-derived melts during periods of melt-rock interaction preceding phases of kimberlite activity. Enhanced sampling of these accreted lithologies in the lowermost lithospheric mantle by kimberlite transports anomalously high proportions of high-Ti garnets along with superdeep diamonds, although there is no direct genetic link between the two. The association between a high proportion of high-Ti garnets and superdeep diamonds at DO-27 could potentially serve as a mineral indicator approach for the presence of superdeep diamonds in other kimberlites.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 3","pages":"541 - 557"},"PeriodicalIF":1.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167806","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":"A tribute to Oded Navon","authors":"Yaakov Weiss","doi":"10.1007/s00710-025-00890-9","DOIUrl":"10.1007/s00710-025-00890-9","url":null,"abstract":"","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 3","pages":"293 - 294"},"PeriodicalIF":1.1,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164175","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":"Petrochemistry and geochronology of Middle Eocene high-K calc-alkaline I-type Kazıkbeli pluton, NE Turkey: implications from zircon U-Pb ages and Sr-Nd-Pb-Lu-Hf isotope data","authors":"Zikrullah Samet Güloğlu,&nbsp;Abdullah Kaygusuz","doi":"10.1007/s00710-024-00881-2","DOIUrl":"10.1007/s00710-024-00881-2","url":null,"abstract":"<div><p>The Kazıkbeli pluton, located in the Kürtün (Gümüşhane) region of the Eastern Pontides, NE Turkey, was studied by employing zircon U-Pb geochronology, whole-rock geochemistry, Sr-Nd-Pb and zircon Lu-Hf isotope geochemistry. LA-ICP-MS U-Pb zircon dating revealed that the gabbroic diorite and granodiorite components of the pluton solidified during the Lutetian epoch of the Middle Eocene, at approximately 46.10 ± 0.26 Ma and 45.37 ± 0.29 Ma, respectively. The pluton is composed of calc-alkaline rocks, ranging from gabbroic diorite to granite (SiO₂ = 55.3 to 72.4 wt%). These I-type rocks are typically metaluminous but exhibit peraluminous tendencies in some cases. They are enriched in large ion lithophile elements and display concave chondrite-normalized rare earth element patterns (La_N/Yb_N = 4.39 to 6.67) with negative Eu anomalies (Eu_N/Eu* = 0.45 to 0.80). The initial εNd values ranged from 1.85 to 2.24, and the initial ⁸⁷Sr/⁸⁶Sr_(i) ratios ranged from 0.70458 to 0.70484, consistent with a mantle source in the isotope ratio diagram. The initial ²⁰⁶Pb/²⁰⁴Pb_(i), ²⁰⁷Pb/²⁰⁴Pb_(i), and ²⁰⁸Pb/²⁰⁴Pb_(i) ratios ranged from 18.505 to 18.571, 15.595 to 15.601, and 38.560 to 38.590, respectively. They have positive εHf_(i) values (5.75 to 8.03), located between depleted mantle and chondrite evolution values. Fractional crystallization of plagioclase, hornblende, and Fe-Ti oxide minerals played a significant role in the magma evolution, while assimilation and magma mixing may have had a minor influence. Collectively, the evidence suggests that the primary magma source for these plutonic rocks was an enriched lithospheric mantle. Subsequent differentiation within crustal magma chambers, with limited crustal contamination, shaped the final magmatic evolution. </p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 1","pages":"73 - 103"},"PeriodicalIF":1.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826599","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":"Mineralogy and petrology of lava of the Goldberg volcano, West Eifel volcanic field, Germany","authors":"André Pouclet,&nbsp;Jacques-Marie Bardintzeff,&nbsp;Étienne Juvigné","doi":"10.1007/s00710-024-00885-y","DOIUrl":"10.1007/s00710-024-00885-y","url":null,"abstract":"<div><p>The Goldberg is the northwesternmost volcano of the West Eifel basanitic and nephelinitic volcanic field in Germany. It was built in the EARLY to MIDDLE PLEISTOCENE, during a monogenic eruption with successive phreatomagmatic and Strombolian activities. The lava is an olivine-, pyroxene-, and phlogopite-phyric leucite nephelinite. Olivine types comprise phenocrysts (Fo% 90–84) and some xenocrysts (Fo% 92). Different pyroxenes crystallised with compositions ranging from Mg-diopside in megacrysts to diopside in the green core of phenocrysts and fassaitic diopside in the rim of phenocrysts. These chemical variations are discussed in terms of correlation of the pyroxene solid solutions. They reveal complex processes with polybaric crystallisation under decreasing pressure for the megacrysts and the green cores of phenocrysts in an initial batch of magma. Then, due to a new supply of magma and its ascent though the crust, the green cores were coated with a different composition and new phenocrysts developed. Amphibole is scarce and consists of Ti-rich pargasite. Mica consists of Al-rich and Ti-rich phlogopite. K-rich nepheline and leucite are common in the groundmass. Oxides, haüyne, and apatite complete the mineral composition. Petrological data indicate the successive emplacement of several batches of magma. The bulk geochemical composition of the lava and scoria is mafic, potassic and highly undersaturated. The volcano belongs to the Eifel F-suite (Foidite). The normalized trace element patterns show a lithophile element enrichment except for Th and U, and a high field strength element depletion. Compared with the composition of the nephelinites and basanites of the western Germany volcanic fields, the Goldberg’s magma shares similar mantle source and no crustal contamination. Geochemical data are consistent with a low degree of melting of an enriched mantle at the garnet-spinel transition region. Low Nb/Ta suggests a potential carbonatitic input into the melting region.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 1","pages":"127 - 147"},"PeriodicalIF":1.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826601","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":"A geological, geochemical and isotopic study of primary diamond deposits in the Siberian craton","authors":"Sergey I. Kostrovitsky,&nbsp;Dmitry A. Yakovlev,&nbsp;Benjamin R. Fosu,&nbsp;Sergey I. Dril,&nbsp;Konstantin V. Garanin","doi":"10.1007/s00710-024-00880-3","DOIUrl":"10.1007/s00710-024-00880-3","url":null,"abstract":"<div><p>We present an overview of published and newly obtained data, which provides general information about the diamond deposits, geochemical and isotopic of kimberlites from all primary diamond deposits of the Siberian craton (20 kimberlite pipes). These deposits are predominantly composed of pyroclastic kimberlites, typically forming as complex, multi-phase, and multi-channel intrusions. Age determinations, based on U-Pb dating of zircon and perovskite, place these deposits between 370 and 350 Ma. A discernible south-to-north gradation in diamond grade across the Siberian craton, particularly in the Yakutian Province correlates with variations in the chemical composition of the kimberlites. The richest diamondiferous deposits are predominantly high-Mg kimberlites. Strikingly, some of the largest deposits by size (such as Jubileynaya, Zarnitsa, and Mir) are Mg-Fe kimberlites and are noted for their lower proportions of high-quality diamonds. Pyroclastic kimberlites, which constitute most Siberian primary diamond deposits generally have higher diamond grades than coherent kimberlites.Apart from the Nakyn field, the distribution of incompatible elements within Siberian diamondiferous kimberlites appears to be independent of their MgO, total FeO, and TiO₂ content. The kimberlites exhibit ɛNd values ranging from + 1.9 to + 7.0 and initial ⁸⁷Sr/⁸⁶Sr ratios (denoted as ⁸⁷Sr/⁸⁶Sr_i) from 0.702 to 0.706 (except for the Nakyn field deposits), suggesting a provenance from a slightly depleted mantle source, akin to the prevalent mantle. The kimberlites of the Nakyn field deposits differ from other Siberian diamond deposits by an abnormally low content of incompatible elements, higher ⁸⁷Sr/⁸⁶Sr_i (0.706 to 0.710), and low ɛNd (-3.1 to + 2; Kononova et al. 2005). It is assumed that the kimberlites of the Nakyn field were derived from a mantle source, with an intermediate composition between prevalent mantle and enriched mantle I.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 1","pages":"21 - 47"},"PeriodicalIF":1.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826642","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}