Results 111 to 120 of about 2,366,156 (316)

Search for magnetic monopoles in polar volcanic rocks

, 2013
For a broad range of values of magnetic monopole mass and charge, the abundance of monopoles trapped inside the Earth would be expected to be enhanced in the mantle beneath the geomagnetic poles.
Bendtz, K., Hirt, A. M., Hächler, H. -P., Mermod, P., Michael, P., Milstead, D., Sloan, T., Tegner, C., Thorarinsson, S. B.   +8 more
core   +1 more source

The Chemistry of Carbon in Aqueous Fluids at Crustal and Upper-Mantle Conditions: Experimental and Theoretical Constraints

, 2012
Carbon can be a major constituent of crustal and mantle fluids, occurring both as dissolved ionic species (e.g., carbonate ions or organic acids) and molecular species (e.g., CO2, CO, CH4, and more complex organic compounds).
C. Manning, E. Shock, D. Sverjensky
semanticscholar   +1 more source

Evolution Model for the Paleoproterozoic Talvivaara Mudstone‐Hosted Ni‐Zn‐Cu‐Co Deposit in Fennoscandia

Terra Nova, EarlyView.
ABSTRACT The Paleoproterozoic Talvivaara mudstone is a very large sulfidic Ni‐Co deposit that records enhanced organic matter accumulation during the global Shunga Event. Here, rock geochemistry and microscale S and Fe isotope composition of in situ pyrrhotites and pyrites are studied in well‐characterised, well‐preserved drill core samples.
Raimo Lahtinen, Jaakko J. Laitala, Joonas J. Virtasalo, Martin J. Whitehouse   +3 more
wiley   +1 more source

The Seismic Expression of Core Complex‐Style Extensional Detachment Faults in Rifted Margins

Terra Nova, EarlyView.
ABSTRACT The identification of core complex‐style extensional detachment faults (CCDFs) in rifted margins is crucial for accurately restoring their stratigraphic and thermal histories. Yet recognising CCDFs in seismic reflection images is challenging due to their faint topographic expression; the lack of associated abrupt offset in seismic reflections;
Pauline Chenin, Gianreto Manatschal, Cuimei Zhang, Peng Chao   +3 more
wiley   +1 more source

Density and strength variations in the mantle lithosphere affect the distribution of intraplate earthquakes

Communications Earth & Environment
The distribution of earthquakes in stable intracontinental tectonic settings is typically far more diffuse than along plate boundaries and the causative mechanisms underlying some recognizable clustering are not understood.
Judith Bott, Magdalena Scheck-Wenderoth, Ajay Kumar, Mauro Cacace, Sebastian Noe, Jan Inge Faleide   +5 more
doaj   +1 more source

Uncertainty of mantle geophysical properties computed from phase equilibrium models

Geophysical Research Letters, 2016
Phase equilibrium models are used routinely to predict geophysically relevant mantle properties. A limitation of this approach is that nonlinearity of the phase equilibrium problem precludes direct assessment of the resultant uncertainties.
J. A. D. Connolly, A. Khan
doaj   +1 more source

Atlas of the underworld : Slab remnants in the mantle, their sinking history, and a new outlook on lower mantle viscosity

, 2017
Across the entire mantle we interpret 94 positive seismic wave-speed anomalies as subducted lithosphere and associate these slabs with their geological record.
D. G. Meer, D. Hinsbergen, W. Spakman
semanticscholar   +1 more source

Emergence of Continents Stabilized the Bioavailability of Boron

Terra Nova, EarlyView.
ABSTRACT Boron is an essential element for the development of life on Earth; borates stabilize ribose in prebiotic reactions and facilitate metabolism in higher plants. There is, however, a relatively narrow surface boron concentration range over which borates stabilize and serve as a micronutrient rather than a toxin.
Brendan V. Dyck, Jon Wade
wiley   +1 more source

Deep carbon cycles constrained by a large-scale mantle Mg isotope anomaly in eastern China

, 2017
Although deep carbon recycling plays an important role in the atmospheric CO2 budget and climate changes through geological time, the precise mechanisms remain poorly understood.
Shuguang Li, Wei Yang, S. Ke, Xunan Meng, H. Tian, Lijuan Xu, Yongsheng He, Jian Huang, Xuan‐Ce Wang, Q. Xia, Wei-dong Sun, Xiaoyong Yang, Zhong‐Yuan Ren, Haiquan Wei, Yongsheng Liu, F. Meng, Jun Yan   +16 more
semanticscholar   +1 more source

Widespread PREMA in the upper mantle indicated by low-degree basaltic melts. [PDF]

Nat Commun, 2023
Cai R, Liu J, Pearson DG, Giuliani A, van Keken PE, Oesch S.   +5 more
europepmc   +1 more source