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Lithos
Elsevier Science B.V.
Lithos

Elsevier Science B.V.

0024-4937

Lithos/Journal LithosSCIISTP
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    Corrigendum to “Petrogenesis and geochronology of Paleoproterozoic magmatic rocks in the Kongling complex: Evidence for a collisional orogenic event in the Yangtze craton” [Lithos 342–343 (2019) 513–529] (LITHOS (2019) 342–343 (513–529), (S0024493719301999), (10.1016/j.lithos.2019.05.015))

    Han Q.Peng S.Polat A.Kusky T....
    2页
    查看更多>>摘要：? 2021 Elsevier B.V.The authors regret that the tectonic setting discrimination diagrams (Fig. 12a) in this article have an obvious mistake that the horizontal and vertical axes (Nb and Y contents in ppm) should be exchanged. The corrected Fig. 12 is attached below. [Figure presented] Fig. 12. (a) and (b) Tectonic setting discrimination diagrams of Nb vs. Y and Y + Nb vs. Rb; (c) and (d) subtype classification of A-type granites. Abbreviations: VAG = volcanic arc granites; ORG = ocean ridge granites; WPG = within-plate granites; Syn-COLG and Post-COLG = syn- and post-collisional granites; OIB = oceanic island basalt; IAB = island arc basalt; A1 = granitoids in anorogenic settings; A2 = post-orogenic granites emplaced after a continental collision. Panels (a) and (b) are after Pearce et al. (1984, 1996). A-type granites field in panel (c) is after Whalen et al. (1987), panels (c) and (d) after Eby (1992). Data sources are the same as in Fig. 7. The authors would like to apologise for any inconvenience caused.
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    • NSTL
    • Elsevier

    Multiple modes of sulphur cycling within a mineralised orogen: A case study from the Fraser Zone, Western Australia

    Walker A.T.Evans K.A.Kirkland C.L.Polito P.A....
    18页
    查看更多>>摘要：? 2021 Elsevier B.V.Sulphur isotope analysis can be used to fingerprint sulphur sources within mineral systems and trace sulphur cycles through geological time. In this work we present petrographic and in-situ sulphur isotope analyses of sulphide minerals from the Zn–Cu–Au–Ag Andromeda volcanogenic massive sulphide (VMS) prospect, Fraser Zone, Albany-Fraser Orogen, Australia. Sulphide mineral assemblages of pyrrhotite, pyrite, chalcopyrite and sphalerite occur within deformed lenses of sulphide breccia at Andromeda, with the presence of sphalerite contrasting with typical magmatic sulphide mineral assemblages recorded elsewhere within the Fraser Zone. The δ34S values of Andromeda sulphides range from 4.50‰ to 6.70‰, characteristic of Archaean and Proterozoic VMS-style deposits worldwide. The Δ33S data show evidence of mass-independent fractionation of sulphur (MIF-S), which indicates that sulphur from Archaean sediments was included within Andromeda sulphides, which formed in close proximity to the Fraser Shear Zone (FSZ). This contrasts with the findings of previous studies of sulphur isotopes within magmatic sulphides elsewhere in the Fraser Zone, which are distal to major shear zones, and in which sulphur derived from Archaean sediments is absent. The absence of a MIF-S signature from the magmatic sulphides is interpreted to reflect cycling of surface-derived sulphur through the ocean prior to incorporation into the magmatic sulphides. The presence of Archaean sedimentary sulphur at Andromeda is attributed to transport from a reservoir of sulphur recording MIF-S within the older Biranup Zone, which is in close proximity to the FSZ, a lithosphere-scale structure. Fluid movement through the FSZ is a viable mechanism that might have transferred sulphur recording MIF-S from Archaean sulphur-bearing pyrite in the Biranup Zone to sulphides at Andromeda. These findings support multiple modes of sulphur cycling within a single Proterozoic mineralised setting and imply that similar polymodal sulphur cycling might have occurred on other Proterozoic continental margins worldwide, with implications for mineralisation and global sulphur cycle systematics.
      原文链接:
    • NSTL
    • Elsevier

    Critical assessment of pressure estimates in volcanic plumbing systems: The case study of Popocatépetl volcano, Mexico

    Tommasini S.Bindi L.Savia L.Orlando A....
    15页
    查看更多>>摘要：? 2021 Elsevier B.V.Most geobarometers use chemical compositions of minerals and their host melt to estimate crystallization pressures. Crystal structural parameters such as cell and site volumes are not usually considered despite their known sensitivity to pressure. Here, we compare two clinopyroxene geobarometers based upon electron microprobe analysis alone and coupled with single-crystal X-ray diffraction data. The case study is the plumbing system of Popocatépetl volcano (Mexico), which consists of three distinct magma reservoirs in upper, middle and lower crustal depths, represented by three compositionally and texturally distinct clinopyroxene populations (T1, Mg# core <78, T2, Mg# core >82, and low-Ca with a lower wollastonite component). These clinopyroxenes are augites of limited compositional variability, although yielding a significant increase in cell (V cell) and M1 site (V M1) volumes from low-Ca and T2 core clinopyroxenes to T1 (core and rim) and T2 (rim) clinopyroxenes. This variation is not due to chemical or temperature effects but is linked to their depth of crystallization. The application of the geobarometer based on chemical composition alone is unable to distinguish the three different reservoirs postulated on volcanological and petrological grounds. In contrast, the application of the geobarometer based on both structural parameters and chemical composition yields a remarkable correlation between the calculated cell volume and the estimated depth of crystallization of the different clinopyroxenes, including core to rim differences. These results have twofold implications. First, the determination of the structural parameters of clinopyroxenes is the only method to resolve the actual distribution of Mg, Fe2+, Fe3+ in the M1 and M2 structural sites and, given the sensitivity of cell and site volumes to pressure, permits to improve geobarometric estimates in volcanic plumbing systems. Second, the quantitative determination of the crystallization depth of the different clinopyroxenes has permitted to rescale the depth of the three different reservoirs in the plumbing system of the Popocatépetl Volcanic Complex located from ~30 km b.s.l. (low-Ca clinopyroxene) to ~18 km b.s.l. (T2 clinopyroxene core) and ~10–0 km b.s.l. (T1 clinopyroxene core and rim, T2 clinopyroxene rim) within the crustal structure of the Morelos platform. This provides further support to the complex plumbing system of the Popocatépetl Volcanic Complex consisting of polybaric storage layers of variable interconnected and interacting transient magma reservoirs.
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    • NSTL
    • Elsevier

    Detrital zircon ages and provenance of a Cambrian succession in the Sierra Albarrana Domain (SW Iberian Massif)

    Solis-Alulima B.Abati J.Lopez-Carmona A.Fernandez-Suarez J....
    34页
    查看更多>>摘要：? 2021 Elsevier B.V.This study presents the first U-Pb geochronological data on detrital zircon grains from the metasedimentary successions of the Sierra Albarrana Domain (SW Iberian Massif) obtained by SHRIMP and LA-ICP-MS. We provide new information on the Maximum Depositional Ages (MDA) during the middle Cambrian through a systematic study, together with age comparisons of the successions, using Kernel Density Estimates (KDE) diagrams, Cumulative Age Distributions (CADs) and the Kolmogorov–Smirnov (K-S) test. On the other hand, the U-Pb zircon data presented in this study have been compared with all the existing data from detrital zircon grains in Neoproterozoic and Cambrian rocks of the Iberian Massif (20 samples, 2706 U–Pb zircon ages). For the comparison, in addition to the KDEs, CADs and K-S test, we apply 3D multidimensional scaling techniques (3D-MDS). The results, together with the geochemical and isotopic characterisation from previous studies, suggest that this domain is likely to be part of the autochthonous section of the Central Iberian Zone (CIZ). Zircon age patterns indicate a probable sedimentary provenance from the Saharan Metacraton with, or without, minor input from the Tuareg Shield. The most important local detrital source corresponds to Cadomian magmatism developed during a magmatic event (535–515 Ma) followed by back-arc extension and early Paleozoic rifting (535–460 Ma). The remaining Mesoproterozoic, Paleoproterozoic and Archean zircon grains would have been provided by the Paleoproterozoic basement and/or the older continental crust recycled in the western sections of the Gondwana margin.
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    • NSTL
    • Elsevier

    Magmatic and hydrothermal evolution of mafic pegmatites and their host basalts, Paraná Large Igneous Province, Brazil

    Gomes A.S.Vasconcelos P.M.Ubide T.Vasconcellos E.M.G....
    22页
    查看更多>>摘要：? 2021 Elsevier B.V.The high-Ti Paranapanema sequence in the Paraná Large Igneous Province consists of a succession of pahoehoe lava flows. Some of these flows host mafic segregation structures, such as horizontal pegmatitic sheet layers and vesicular cylinders. Geochronology, whole-rock and mineral chemistry of two pegmatite occurrences and their host basalts permit characterizing crystal-melt segregation processes that occur during magmatic differentiation after lava flow emplacement. The mineralogy of the pegmatites is similar to that of the host basalts, and it includes plagioclase, pyroxene and titanomagnetite-ilmenite crystals; the only observable difference is the coarser grain size of primary phases and an increase in the volume fraction of clay minerals derived from glass devitrification and vesicle infilling in the pegmatites (~15 vol% clay in the pegmatites vs. ~6 vol% clay in the basalts). The pegmatites from both sites are more fractionated than the enclosing lavas and are enriched in TiO2, FeOtotal, K2O, P2O5 and incompatible trace elements (e.g., Ba, Rb, Nb, Hf, Y, Zr, La, Ce, Yb). Thermodynamic modeling of whole-rock compositional data suggests that the Barrac?o pegmatites were formed after ~8–27 wt% fractional crystallization of the host basalt, whereas the Capanema pegmatites formed after ~38–43 wt% fractional crystallization of the host basalt. 40Ar/39Ar geochronology indicates slight yet significant age differences between plagioclase phenocrysts from the pegmatites and whole-rock fragments from the enclosing lavas (Capanema: 133.56 ± 0.52 pegmatite vs. 134.30 ± 0.46 Ma enclosing lava; Barrac?o: 133.23 ± 0.88 pegmatite vs. 134.49 ± 0.31 Ma enclosing lava). These age differences likely result from hydrothermal alteration of the plagioclase phenocrysts (e.g., secondary albite and K-feldspar), and they are not due to resolvable differences in crystallization age. Smectite-celadonite aggregates recovered from the Capanema basalt suggest that hydrothermalism occurred at 123.18 ± 0.61 Ma, approximately ten million years after rock crystallization.
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    • NSTL
    • Elsevier

    Boron release and transfer induced by phengite breakdown in subducted impure metacarbonates

    Guo S.Su B.Tang P.Chen Y....
    21页
    查看更多>>摘要：? 2021 Elsevier B.V.White mica is an important reservoir of boron (B) in subducted metasedimentary rocks. To quantify the effect of phengite breakdown on B release and transfer, we investigated the replacement processes of phengitic mica and associated element redistribution in exhumed ultra-high pressure (UHP) impure marbles from the Dabie terrane, China. Three types of microstructures, which are related to the liberation, transport, and precipitation of B, are recognized: (1) Type-I is the pseudomorphic replacement of phengite by the assemblage of biotite + plagioclase ± quartz ± epidote. The assemblage maintains a flaky shape of pre-existing phengite, which only rarely occurs as a relict phase in the product assemblages. Phase equilibria modelling indicates that the conditions of replacement reactions are 1.2–1.3 GPa at ~600 °C, with a relatively low XCO2 of 0.04–0.16. (2) Type-II is characterized by the local occurrence of fine-grained tourmaline (Tur-F) along the outer margin of Type-I texture domains, which represents the in situ precipitation of B released by the replacement reactions. (3) Type-III texture involves the irregularly shaped intergrowth of tourmaline (Tur-In) + quartz in the calcite matrix, isolated from the Type-I and Type-II texture domains. The Type-III minerals are in equilibrium with diopside and plagioclase and most likely represent the precipitation from a “transported”, B-bearing fluid. Mineral trace element analyses indicate that relict phengite in Type-I texture has significantly higher B contents (284–464 μg/g) than all of the product minerals (2–26 μg/g). A mass balance estimate indicates that the majority (>90%) of B in the reactants is lost during the process of phengite replacement. The calculations in terms of mineral-fluid partition indicate that the fluid involved in the replacement reactions has B contents of 1893–6858 μg/g. In situ B isotopic analyses indicate that Tur-F and Tur-In have a similar variation range of δ11B (+4 ~ +7‰). Both types of low-pressure tourmaline have lower δ11B values than the previously reported eclogite-facies tourmaline (reaching +15‰) from phengite-bearing marbles in the same study area. This result indicates two episodes of tourmaline growth and B transfer. Thus, a two-stage model of B loss from phengite during slab exhumation is proposed. Our results reveal that the breakdown of white mica in exhumed metasedimentary rocks can cause a strong release of B, which would largely influence the B budget at convergent plate margins.
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    • NSTL
    • Elsevier

    Campanian transformation from post-collisional to intraplate tectonic regime: Evidence from ferroan granites in the Southern Qiangtang, central Tibet

    Wang Z.-L.Fan J.-J.Wang Q.Hu W.-L....
    13页
    查看更多>>摘要：? 2021Ferroan granitoids are typically generated in the extensional tectonic settings, and thus record important geodynamic processes related to crustal and mantle evolution. However, their petrogenesis remains controversial. In this study, we investigated newly identified ferroan granites in the Lake Cona region of the southern Qiangtang subterrane (SQT), central Tibet. We present zircon U–Pb age and Hf–O isotope, whole-rock major and trace element and Sr–Nd isotope, and mineral major element data for these rocks. The Lake Cona granites consist of biotite monzogranite and granite porphyry. Zircon U–Pb dating indicates these rocks were generated in the late Late Cretaceous (ca. 75 Ma). The biotite monzogranites are metaluminous to weakly peraluminous, and characterized by relatively high SiO2 (67.1–68.6 wt%), total alkali (10.4–10.8 wt%), Th (31–46 ppm), light rare earth element (LREE), and Zr + Nb + Ce + Y (421–730 ppm) contents, and high Fe-numbers (0.83–0.91; FeOt/[FeOt + MgO]). These rocks can be classified as alkalic ferroan granites. However, compared with the typical ferroan granitoids generated under relatively anhydrous conditions, the biotite monzogranites have higher Al2O3 (15.9–17.0 wt%) contents, lower 10000 × Ga/Al (2.1–2.5) ratios, and small negative Eu anomalies, suggesting that they were generated by brine-assisted (a fluid with low water activity) crustal anatexis. The biotite monzogranites have (87Sr/86Sr)i = 0.7065–0.7069, εNd(t) = ?2.3 to ?1.9, δ18O = 6.0–6.6‰, and εHf(t) = +2.1 to +9.3, indicative of a magma source that was a mixture of juvenile and ancient crustal components. The granite porphyries also have high contents of total alkalis (9.9–10.2 wt%) and Fe-numbers (0.87–0.90), and similar Sr–Nd–Hf–O isotopic compositions as the biotite monzogranites, but have higher SiO2 and lower TiO2, MgO, TFe2O3, P2O5, CaO, and REE contents, and larger negative Eu anomalies. These features suggest that the granite porphyries represent the highly evolved biotite monzogranitic magmas that underwent differentiation in the shallow crust. The Lake Cona ferroan granites formed in a post-collisional extensional setting that had additional heat input from the deep mantle. Unlike the early Late Cretaceous that was dominated by calc-alkaline magmatism in the SQT, the occurrence of alkali ferroan granites in the late Late Cretaceous may record the transformation from a post-collisional to an intraplate tectonic regime in the central Tibet.
      原文链接:
    • NSTL
    • Elsevier

    Newly discovered late Devonian and early Carboniferous ophiolite fragments in the Diyanmiao mélange in southeastern Inner Mongolia: Implications for the late Paleozoic tectonic evolution of the southeastern Central Asian Orogenic Belt

    Liu J.Li J.Zhang J.Zhao S....
    16页
    查看更多>>摘要：? 2021 Elsevier B.V.The Late Paleozoic tectonic evolution of the southeastern Central Asian Orogenic Belt (CAOB) has long been controversial, and one of the most contentious issues has been whether there was a collisional orogenic event during the Middle Paleozoic. Here we report the discovery of a Late Devonian (373.5 ± 6.8 Ma) ophiolite fragment in the Diyanmiao mélange of southeastern Inner Mongolia. This fragment, coupled with previously reported Carboniferous ophiolites in the same region, confirm the former presence of a Late Devonian ocean basin that evolved into the Carboniferous basin. The geochemical characteristics of the Devonian and Carboniferous mafic rocks in the ophiolites are consistent with evolutionary trends from mid-ocean ridge (MOR)-like to supra-subduction zone (SSZ) compositions. The presence of a Late Devonian-Carboniferous trench-arc-basin system in the region, which is represented by the Daqing-Diyanmiao and Bayan'aobao-Hongger ophiolite belts, the Baolidao arc, and the Erenhot-Hegenshan Oceanic Basin (EHB), confirms the presence of a late Devonian-Carboniferous orogenic belt in the southeastern CAOB. The western segment of the Baolidao arc was developed on continental basement (the Xilin Gol complex), whereas the eastern segment was formed on oceanic basement. This tectonic configuration is similar to that of the modern Aleutian arc, Kamchatka-Kuril Islands and Japan-Ryukyu arc system in the northern and western Pacific Ocean. During the early Permian the oceanic basin represented by the Erenhot-Hegenshan basin closed, and the Baolidao arc was accreted onto the southern continental margin of the Southern Mongolian continental block.
      原文链接:
    • NSTL
    • Elsevier