..., part 13 [see footnote 2 ]). Parent sample SH314-HOS yields P = 0.823 when compared to its crosscutting sill SH314-SI, and P = 0.986 for the proximal dike (MSCD). Parent samples WPCHR4 and SH314-HOS also show a high probability of correlation, P = 0.725. In contrast, the northernmost dike, WP113...

...-studied settings of the Pilbara greenstone terrain, Western Australia. Nine stratiform samples (ca. 3.5–3.2 Ga) were obtained from the North Pole, McPhee, Marble Bar, Apex, Kitty's Gap, and Sulfur Spring cherts. In addition, four samples were taken from dikes trending at high angles into the Kitty's Gap...

..., the higher Xsps and lower REE contents of garnet from the upper pegmatite dike located in the west ( Fig. 5 and Table 5 ) show that the border zone, layered aplite and zone II of the No. 3 pegmatite are less evolved and fractionated. Furthermore, the Sc and Y contents show negative correlation whilst...

... to be related to the mid-Mesoproterozoic breakup of Columbia (see Zhang et al., 2017 ). The mafic dikes in the northern NCC share geochemical characteristics of both ocean-island basalts and island-arc volcanic rocks, as can be seen in tectonic-setting–based discrimination diagrams (Fig. DR6). Geochemically...

... and fractionation. This was a finding in previous studies ( Irber 1999 ) and is supported by our observation of close correlations between the degree of tetrad development and deviation from normal magmatic ratios of geochemical twin elements Y and Ho, and Zr and Hf. The levels in the Orlovka intrusion at which...

... and is hosted by a mafic-ultramafic rock sequence that has been locally intruded by four generations of monzogranite dikes. Two stages of gold mineralization, identified on the basis of crosscutting relationships, formed under broadly synpeak to postpeak metamorphic conditions. Main stage gold mineralization...

... in a similar manner as the HREE, especially Ho, as these elements have similar ionic radii. Yttrium and Ho positively correlate in the present study, with Y/Ho ratios of 28.8–38.7 ( Fig. 6c ), close to the upper continental crust Y/Ho value of 27.5 estimated by McLennan (2001) . This confirms...

... biotite granite mirrors the oxygen fugacity trends inferred from the Europium anomaly, suggesting that V versus As relationship may serve as a potential fingerprint for oxygen fugacity in scheelite. The decline in the Y/Ho ratio from early to late scheelite stages likely results from self-precipitation...

... dikes with intricate relationships between contrasting magmas. The role of mantle plumes and the significance of LIPs in the Earth’s history are the subject of active scientific discussion. The above concepts, however, are not unambiguously prevailing; many researchers deny the influence of mantle...

... ; Bao et al., 2008 ). In calcite from the Nikolaevskoe deposit it varies from 28.7 to 54.1. Part of these values falls in the range of the Y/Ho values of magmatic calcite and ore-bearing dolerite-porphyrite and gabbro–diorite-porphyrite dikes of the deposit, and the other values are typical of marine...

..., Huayangchuan, and Jialu carbonatite dike systems) in the Lesser Qinling of Central China and uses Mo isotope systematics to provide unique insights into the HREE enrichment process of these magmas. All three carbonatites exhibit elevated total REE (ΣREE) concentrations (up to 4600 ppm), along with significant...

... significant positive δEu anomalies, which are considered to be unrelated to the redox state, but caused by the addition of Eu (e.g., feldspar dissolution). The high-Y/Ho ratio of scheelite and a good correlation between Y/Ho ratio and δEu (R 2 = 0.96) suggest that intense fluid-rock interactions between ore...

... of in situ C isotope ratios versus Fe contents of the dolomite from different paragenetic settings do not show any obvious correlation (App. Fig. A2). The corrected 18 O/ 16 O ratios are reported in standard δ 18 O notation, relative to SMOW, and the 13 C/ 12 C ratios are reported relative to V-PDB...

... were plotted using Isoplot/Ex ( Ludwig, 1999 ). Malaya Kosa basaltoids and the dolerites in the dikes underwent low-temperature alteration, which might have set some elements in motion. Most researchers agree that the least mobile elements during alterations are HFSE such as Th, Zr, Hf, Ti, Nb...

.... This occurrence, which is defined by a 3–5 cm wide sinouous zone of granoblastic monazite, apatite, and titanomagnetite, is enclosed within aplitic monzonite and granitic pegmatite dikes. Monazite in this dike was studied in detail using in situ laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP...

...; sample 96-10). (F) Intermediate dike with flattened Grt crosscutting the Gruyere intrusion (15GY0096, 279.0 m; sample 96-11). (G) Gruyere open pit exposure looking east-northeast illustrating the Gruyere intrusion crosscut by the Main dike and V 3B and V 3C vein sets (central zone, 9,320 mRL; photo...

... of some of the most abundant trace elements in the different series by pairs of elements yield relatively poor correlations up to ca. 0.82 ( Figs. 3 , 4 ), which indicates that the concentrations are not simply related to the pegmatite type, the paragenesis, or geological setting. In the case...

... of the Olekma granitoids (343± 7.6 Ma ( I 0 = 0.7060± 0.0024) for biotite and leucocratic granites and 318± 8.4 Ma ( I 0 = 0.7052± 0.0009) for leucogranite and aplite dikes) attest to the Late Paleozoic age of the Olekma complex rather than Early Paleozoic as it was believed earlier. The new results...

... author. E-mail address: [email protected] (V.A. Yakovlev) 10 03 2023 17 08 2023 © 2024, Novosibirsk State University 2024 Novosibirsk State University dikes mingling mixing Nb-rich magmas collision magmatism U–Pb dating tectonic settings Tuva–Mongolian massif CAOB...

... . 16. Pushkarev , E.V. , and N.A. Khazova , Complex of parallel diabase dikes of the Khabarnoe Massif: spreading in the setting of oceanic ridge or island arc? , in Annual-1990 [in Russian], 40 – 43 , Institut Geologii i Geokhimii UrO SSSR, Sverdlovsk...