Passing the Editorial Baton     

George W. LutherIII 《Aquatic Geochemistry》2018,24(1):1-2

  相似文献   

Lu–Hf Isotopic Systematics of Zircon From Lower Crustal Xenoliths in the Belomorian Mobile Belt     

Vetrin  V. R.  Belousova  E. A.  Kremenetsky  A. A. 《Geology of Ore Deposits》2018,60(7):568-577

Geology of Ore Deposits - The structure, geochemistry, and U–Pb and Lu–Hf isotopic composition of zircon crystals from garnet granulite xenoliths of the lower crust in the Belomorian...  相似文献   

Epifanovite,NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O: a New Mineral from the Kester Deposit,Sakha (Yakutia) Republic,Russia     

Yakovenchuk  V. N.  Pakhomovsky  Ya. A.  Konoplyova  N. G.  Panikorovskii  T. L.  Mikhailova  Yu. A.  Bocharov  V. N.  Krivovichev  S. V.  Ivanyuk  G. Yu. 《Geology of Ore Deposits》2018,60(7):587-593

Geology of Ore Deposits - Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O, a new natural copper, sodium and calcium arsenate–phosphate, has been found in a quartz–phosphate pocket...  相似文献   

Redefinition of Lemanskiite: New Mineralogical Data,Crystal Structure,and Revised Formula NaCaCu5(AsO4)4Cl · 3H2O     

Zubkova  N. V.  Pekov  I. V.  Chukanov  N. V.  Kasatkin  A. V.  Ksenofontov  D. A.  Yapaskurt  V. O.  Britvin  S. N.  Pushcharovsky  D. Yu. 《Geology of Ore Deposits》2018,60(7):594-606

Geology of Ore Deposits - The crystal structure of lemanskiite is determined for the first time (R = 0.019) and the mineral is redefined. Its chemical formula, crystal system, space group and...  相似文献   

Crustal melting and recycling: geochronology and sources of Variscan syn-kinematic anatectic granitoids of the Tormes Dome (Central Iberian Zone). A U–Pb LA-ICP-MS study     

López-Moro  F. J.  López-Plaza  M.  Gutiérrez-Alonso  G.  Fernández-Suárez  J.  López-Carmona  A.  Hofmann  M.  Romer  R. L. 《International Journal of Earth Sciences》2018,107(3):985-1004

International Journal of Earth Sciences - In this study, we report U–Pb Laser Ablation ICP-MS zircon and ID-TIMS monazite ages for peraluminous granitoid plutons...  相似文献   

Authigenic rhodochrosite from a gas hydrate-bearing structure in Lake Baikal     

Krylov  Alexey A.  Hachikubo  Akihiro  Minami  Hirotsugu  Pogodaeva  Tatyana V.  Zemskaya  Tamara I.  Krzhizhanovskaya  Mariya G.  Poort  Jeffrey  Khlystov  Oleg M. 《International Journal of Earth Sciences》2018,107(6):2011-2022

International Journal of Earth Sciences - Early diagenetic carbonates are rare in Lake Baikal. Siderite (Fe carbonate) concretions in the sediments were discovered only recently. Here, we discuss...  相似文献   

Structure,mechanical properties and evolution of the lithosphere below the northwest continental margin of India     

Rao  G. Srinivasa  Kumar  Manish  Radhakrishna  M. 《International Journal of Earth Sciences》2018,107(6):2191-2207

International Journal of Earth Sciences - The continental breakup history at the northwest continental margin of India remained conjectural due to lack of clearly discernable magnetic anomaly...  相似文献   

A Cambrian mixed carbonate–siliciclastic platform in SW Gondwana: evidence from the Western Sierras Pampeanas (Argentina) and implications for the early Paleozoic paleogeography of the proto-Andean margin     

Ramacciotti  Carlos D.  Casquet  César  Baldo  Edgardo G.  Galindo  Carmen  Pankhurst  Robert J.  Verdecchia  Sebastián O.  Rapela  Carlos W.  Fanning  Mark 《International Journal of Earth Sciences》2018,107(7):2605-2625

International Journal of Earth Sciences - The Western Sierras Pampeanas (WSP) of Argentina record a protracted geological history from the Mesoproterozoic assembly of the Rodinia supercontinent to...  相似文献   

The synergistic effect of calcium on organic carbon sequestration to ferrihydrite   总被引：1，自引：0，他引：1  

Tyler D. Sowers  Jason W. Stuckey  Donald L. Sparks 《Geochemical transactions》2018,19(1):4

Sequestration of organic carbon (OC) in environmental systems is critical to mitigating climate change. Organo-mineral associations, especially those with iron (Fe) oxides, drive the chemistry of OC sequestration and stability in soils. Short-range-ordered Fe oxides, such as ferrihydrite, demonstrate a high affinity for OC in binary systems. Calcium commonly co-associates with OC and Fe oxides in soils, though the bonding mechanism (e.g., cation bridging) and implications of the co-association for OC sequestration remain unresolved. We explored the effect of calcium (Ca²⁺) on the sorption of dissolved OC to 2-line ferrihydrite. Sorption experiments were conducted between leaf litter-extractable OC and ferrihydrite at pH 4 to 9 with different initial C/Fe molar ratios and Ca²⁺ concentrations. The extent of OC sorption to ferrihydrite in the presence of Ca²⁺ increased across all tested pH values, especially at pH ≥ 7. Sorbed OC concentration at pH 9 increased from 8.72 ± 0.16 to 13.3 ± 0.20 mmol OC g^?1 ferrihydrite between treatments of no added Ca²⁺ and 30 mM Ca²⁺ addition. Batch experiments were paired with spectroscopic studies to probe the speciation of sorbed OC and elucidate the sorption mechanism. ATR-FTIR spectroscopy analysis revealed that carboxylic functional moieties were the primary sorbed OC species that were preferentially bound to ferrihydrite and suggested an increase in Fe-carboxylate ligand exchange in the presence of Ca at pH 9. Results from batch to spectroscopic experiments provide significant evidence for the enhancement of dissolved OC sequestration to 2-line ferrihydrite and suggest the formation of Fe–Ca-OC ternary complexes. Findings of this research will inform modeling of environmental C cycling and have the potential to influence strategies for managing land to minimize OM stabilization.  相似文献   

Impacts of hydrous manganese oxide on the retention and lability of dissolved organic matter     

Jason W. Stuckey  Christopher Goodwin  Jian Wang  Louis A. Kaplan  Prian Vidal-Esquivel  Thomas P. BeebeJr.  Donald L. Sparks 《Geochemical transactions》2018,19(1):6

Minerals constitute a primary ecosystem control on organic C decomposition in soils, and therefore on greenhouse gas fluxes to the atmosphere. Secondary minerals, in particular, Fe and Al (oxyhydr)oxides—collectively referred to as “oxides” hereafter—are prominent protectors of organic C against microbial decomposition through sorption and complexation reactions. However, the impacts of Mn oxides on organic C retention and lability in soils are poorly understood. Here we show that hydrous Mn oxide (HMO), a poorly crystalline δ-MnO₂, has a greater maximum sorption capacity for dissolved organic matter (DOM) derived from a deciduous forest composite O_i, O_e, and O_a horizon leachate (“O horizon leachate” hereafter) than does goethite under acidic (pH 5) conditions. Nonetheless, goethite has a stronger sorption capacity for DOM at low initial C:(Mn or Fe) molar ratios compared to HMO, probably due to ligand exchange with carboxylate groups as revealed by attenuated total reflectance-Fourier transform infrared spectroscopy. X-ray photoelectron spectroscopy and scanning transmission X-ray microscopy–near-edge X-ray absorption fine structure spectroscopy coupled with Mn mass balance calculations reveal that DOM sorption onto HMO induces partial Mn reductive dissolution and Mn reduction of the residual HMO. X-ray photoelectron spectroscopy further shows increasing Mn(II) concentrations are correlated with increasing oxidized C (C=O) content (r = 0.78, P < 0.0006) on the DOM–HMO complexes. We posit that DOM is the more probable reductant of HMO, as Mn(II)-induced HMO dissolution does not alter the Mn speciation of the residual HMO at pH 5. At a lower C loading (2 × 10² μg C m^?2), DOM desorption—assessed by 0.1 M NaH₂PO₄ extraction—is lower for HMO than for goethite, whereas the extent of desorption is the same at a higher C loading (4 × 10² μg C m^?2). No significant differences are observed in the impacts of HMO and goethite on the biodegradability of the DOM remaining in solution after DOM sorption reaches steady state. Overall, HMO shows a relatively strong capacity to sorb DOM and resist phosphate-induced desorption, but DOM–HMO complexes may be more vulnerable to reductive dissolution than DOM–goethite complexes.  相似文献