Multistage mantle metasomatism deciphered by Mg−Sr−Nd−Pb isotopes in the Leucite Hills lamproites

Sun, Yang; Teng, Fang‐Zhen; Pang, Kwan‐Nang; Ying, Ji‐Feng; Kuehner, S. M.

doi:10.1007/s00410-021-01801-9

Cited by 12 publications

(5 citation statements)

References 76 publications

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“…The Grizzly Peak caldera therefore has the strongest evidence for incorporation of large amounts of ancient felsic crust relative to many other Laramide and younger magma systems in the central Colorado Mineral Belt. Sun et al 2021). Each of these processes can modify the parent-daughter ratios of isotopic systems or modify the isotopic compositions without significantly changing the major element composition of the reservoir.…”

Section: Trace Element Signature For Anatexis Of Garnet-absent Lower ...mentioning

confidence: 99%

“…Early isotopic studies that explored the origin of F-rich granites and rhyolites in the western United States (e.g., Farmer and DePaolo 1984;Stein and Crock 1990) were conducted before isotopic compositions of lower crustal xenolith suites in the region were fully characterized (e.g., Selverstone et al 1999;Farmer et al 2005). Furthermore, early studies suggested basaltic end members to magma systems were sourced from depleted mantle, whereas other studies document evidence that large portions of the western United States contain enriched lithospheric mantle (e.g., Coleman et al 1992;Pettke et al 2010;Sun et al 2021). A more comprehensive examination of lower crustal xenolith data, as well as trace element and isotope geochemistry, is required to characterize sources of F-rich granites and rhyolites in the western United States.…”

Section: Introductionmentioning

confidence: 99%

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Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits

Rosera,

Frazer,

Mills

et al. 2023

American Mineralogist

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Fluorine-rich granites and rhyolites occur throughout the southern Rocky Mountains, but the origin of F-enrichment has remained unclear. We test if F-enrichment could be inherited from ancient mafic lower crust by: (1) measuring amphibole compositions, including F and Cl contents, of lower crustal mafic granulite xenoliths from northern Colorado to determine if they are unusually enriched in halogens; (2) analyzing whole-rock elemental and Sr, Nd, and Pb isotopic compositions for upper crustal Cretaceous to Oligocene igneous rocks in Colorado to This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Trace Element Signature For Anatexis Of Garnet-absent Lower ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits

Rosera,

Frazer,

Mills

et al. 2023

American Mineralogist

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“…Among the K‐rich rocks analyzed in this study, leucite‐free samples (lamproite) also display Mg‐Zn isotopic decoupling ( δ 26 Mg = −0.55 to −0.21‰, δ 66 Zn = 0.27–0.35‰; n = 27; Table 1), which is indistinguishable from that of leucite‐bearing rocks (ugandite, leucite‐basanite, ankaratrite and melilite‐leucitite; δ 26 Mg = −0.61 to −0.22‰, δ 66 Zn = 0.26–0.33‰; n = 9; Table 1). Low δ 26 Mg values have also been discovered in lamproites from the Leucite Hills ( δ 26 Mg = −0.43 to −0.37‰; Sun et al., 2021) and high‐MgO lamproites from Eastern China ( δ 26 Mg = −0.59 to −0.35‰; Z. X. Wang et al., 2022). Therefore, we suggest that the mantle sources of these circum‐Mediterranean K‐rich rocks are widely metasomatized by carbonate‐bearing silicate sediments.…”

Section: Discussionmentioning

confidence: 99%

Recycled Carbonate‐Bearing Silicate Sediments in the Sources of Circum‐Mediterranean K‐Rich Lavas: Evidence From Mg‐Zn Isotopic Decoupling

et al. 2023

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The solid Earth contains more carbon than the entire surface reservoir (ocean, atmosphere, and biosphere) in terms of mass: over 90% of carbon is located in the crust, mantle, and core (Dasgupta & Hirschmann, 2010;Wood, 1993). Carbon is released from the Earth's interior mainly in the form of carbon dioxide (CO 2 ) by degassing from volcanoes (up to 90%) and metamorphic reactions (≈10%; Mason et al., 2017). The flux of CO 2 released from oceanic volcanism (mid-ocean ridges and ocean islands) is ∼29-154 Megatons per year (Mt/yr) (Kelemen & Manning, 2015), and the global flux of CO 2 emitted from other volcanic environment, including plume degassing and diffuse degassing, is up to ∼108 Mt/yr (Werner et al., 2019), which has a significant time-integrated impact on the concentration of atmospheric CO 2 (161 × 10 3 Mt; Lee et al., 2019). The circum-Mediterranean region, which experienced a prolonged period of convergence between the African-Arabian and the Eurasian plates from the late Jurassic to Cenozoic (Prelević & Foley, 2007), contributes an anomalously large flux of subaerial volcanic CO 2 emissions (20.1 Mt/yr;Werner et al., 2019), accounting for about 20% of the global total. This

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“…No significant differences in mineral assemblage, texture, and crystal content have been recognized between the two dikes. The Japan trench is reported as red solid line with triangles and the depth of the Pacific slab is reported as dashed lines; the number indicates the depth in km (modified from Zhang et al, 2018;Chen et al, 2021;Fan et al, 2021;Sun et al, 2021)…”

Section: Sample Descriptionsmentioning

confidence: 99%

“…FIGURE 1 | (A)Schematic map showing location of the Changbaishan and other major volcanoes in NE China. The Japan trench is reported as red solid line with triangles and the depth of the Pacific slab is reported as dashed lines; the number indicates the depth in km (modified fromZhang et al, 2018;Chen et al, 2021;Fan et al, 2021;Sun et al, 2021). (B) Geological map of the Changbai Mountains volcanic field showing distribution of polygenetic (Changbaishan (Tianchi), Wangtian'e, and Namphothe and monogenetic (gray dots) volcanoes.…”

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confidence: 99%

Geochronology and Petrogenesis of Early Pleistocene Dikes in the Changbai Mountain Volcanic Field (NE China) Based on Geochemistry and Sr-Nd-Pb-Hf Isotopic Compositions

Ventura

et al. 2021

Front. Earth Sci.

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Changbai Mountains intraplate volcanism (NE China) developed above the 500 km deep stagnant portion of the Pacific slab in the last 20 Ma. The more recent activity includes a shield-forming stage (2.8–0.3 Ma), the Tianchi cone construction stage (1.5–0.01 Ma), and a caldera-forming stage (0.2 Ma-present). Detailed studies on the petrogenesis of the volcanic products between the first two stages and the possible role of geodynamics and local tectonics in controlling the volcanism, however, are lacking. Here, we present structural and whole-rock geochemical and zircon Hf isotopic data on Pleistocene dikes of the Changbai Mountains at the transition from the shield-forming to the Tianchi stage with the aim to constrain their age and the source(s) of their parental magma. The dikes represent the shallower feeding system of monogenetic cones and have a NW-SE strike, which is also the preferred strike of the major fault affecting the area and along which the Changbai Mountains monogenetic scoria cones align. The dikes have a potassic affinity and a trachybasaltic composition. Their zircon U–Pb age is 1.19–1.20 Ma (Calabrian). The trachybasalts are enriched in Rb, Ba, Th, U, Nb, Ta, K, Pb, and LREE and slightly depleted in Sr, Zr, Hf, Ti, and HREE with a weak negative Eu/Eu* (δEu = 0.96–0.97). Trace elements and isotopic compositions are compatible with an OIB-type source with an EMI signature. The calculated (87Sr/86Sr)i (=0.705165–0.705324), (143Nd/144Nd)i (= 0.512552–0.512607, εNd(t) = −0.58 to −1.65), and Hf model ages (TDM2) of 1768–1562 Ma suggest that the trachybasaltic dikes were contaminated by a Mesoproterozoic, relatively basic lower crust. The source of the Calabrian trachybasalts consists of asthenospheric melts modified by a subcontinental lithospheric mantle. These melts upwell from depth and stop at the crust-mantle interface where underplating processes favor the assimilation of ancient lower crust material. During the ascent to the surface along deep-seated crustal discontinuities, these magmas weakly differentiate.

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Multistage mantle metasomatism deciphered by Mg−Sr−Nd−Pb isotopes in the Leucite Hills lamproites

Cited by 12 publications

References 76 publications

Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits

Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits

Recycled Carbonate‐Bearing Silicate Sediments in the Sources of Circum‐Mediterranean K‐Rich Lavas: Evidence From Mg‐Zn Isotopic Decoupling

Geochronology and Petrogenesis of Early Pleistocene Dikes in the Changbai Mountain Volcanic Field (NE China) Based on Geochemistry and Sr-Nd-Pb-Hf Isotopic Compositions

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