Results 81 to 90 of about 330,203 (416)
Calcium peroxide from ambient to high pressures [PDF]
Phys. Chem. Chem. Phys. 17, 6889-6895 (2015), 2015 Structures of calcium peroxide (CaO2) are investigated in the pressure range 0-200 GPa using the ab initio random structure searching (AIRSS) method and density functional theory (DFT) calculations. At 0 GPa, there are several CaO2 structures very close in enthalpy, with the ground-state structure dependent on the choice of exchange-correlation ...
arxiv +1 more source
Evidence of late Quaternary environmental change in a continental east Antarctic lake from lacustrine sedimentary pigment distributions [PDF]
, 2005 A sediment core from Progress Lake, one of the oldest lacustrine sequences in East Antarctica, contains distinct zones dating from a previous interglacial (most likely Marine Isotope Stage 5e, c.
Hodgson, D A, Keely, B J, Squier, A H
core +2 more sources
The Depositional Record, EarlyView.The impact of syn‐depositional compaction on the sedimentation distribution and the interdependency between different delta areas related to the sediment budget are not fully understood. Our result shows that compaction creates additional accommodation space that leads to more sedimentation in the delta plain, while limiting sediment delivery towards ...
A. A. Valencia +3 more
wiley +1 more source
The Depositional Record, EarlyView.This paper presents laboratory experiments that investigated the dynamics of mud‐grade calcite laden gravity flows, with the aim of determining how mobile these calciclastic flows are in comparison to fine‐grained cohesive and non‐cohesive siliciclastic gravity flows.
Jaco H. Baas +3 more
wiley +1 more source
Communications Earth & EnvironmentThe Steptoean positive carbon isotope excursion (SPICE) event, one of the largest carbon cycle perturbations in the Cambrian, coincides with shallow-shelf-fauna extinction and plankton revolution (critical transition of plankton).
Haozhe Wang +7 more
doaj +1 more source
Unexpected 3+ valence of iron in FeO$_2$, a geologically important material lying "in between" oxides and peroxides [PDF]
Sci. Rep. 7, 13005 (2017), 2017 Recent discovery of pyrite FeO$_2$, which can be an important ingredient of the Earth's lower mantle and which in particular may serve as an extra source of water in the Earth's interior, opens new perspectives for geophysics and geochemistry, but this is also an extremely interesting material from physical point of view.
arxiv +1 more source
Glass in the submarine section of the HSDP2 drill core, Hilo, Hawaii [PDF]
, 2004 The Hawaii Scientific Drilling Project recovered ~3 km of basalt by coring into the flank of Mauna Kea volcano at Hilo, Hawaii. Rocks recovered from deeper than ~1 km were deposited below sea level and contain considerable fresh glass. We report electron
Baker, Michael +4 more
core +1 more source
The Depositional Record, EarlyView.Two non‐seismically generated sedimentary volcanoes were excavated on the Colorado River delta in Lake Powell, Utah, USA, in order to characterise the internal structures. Sedimentary volcanoes are commonly employed as tools in palaeoseismic reconstruction, thus it is important to establish criteria to differentiate non‐seismic‐generated sedimentary ...
Michael C. Wizevich +6 more
wiley +1 more source
Coral Paleoclimate Perspectives Support the Role of Low‐Latitude Forcing on the 4.2 ka BP Event
Geophysical Research Letters, 2023 The 4.2 ka BP Event is an abrupt climate change that might have contributed to the collapse of ancient civilizations and marks the transition between the mid‐ and late‐Holocene.
Xuefei Chen +6 more
doaj +1 more source
Dynamical geochemistry of the mantle [PDF]
Solid Earth, 2011 Abstract. The reconciliation of mantle chemistry with the structure of the mantle inferred from geophysics and dynamical modelling has been a long-standing problem. This paper reviews three main aspects. First, extensions and refinements of dynamical modelling and theory of mantle processing over the past decade. Second, a recent reconsideration of the
openaire +4 more sources