Results 21 to 30 of about 3,336,558 (167)

The P–T–X conditions of staurolite-garnet metabasites, NW Iran: Implications for metamorphism during Arabia-Eurasia collision

Journal of Asian Earth Sciences: X
The staurolite-bearing Avajiq metabasites (AMB) crop out near the NW border of Iran with Turkey and contain the peak assemblage garnet + Ca-amphibole + staurolite + biotite + chlorite1 + ilmenite. The AMB record peak pressure–temperature (P-T) conditions
Monir Modjarrad, Donna L. Whitney, Hadi Omrani   +2 more
doaj   +1 more source

High-temperature wood silicification: constraints from fluid and carbonaceous inclusions in quartz from Qitai, NW China

Scientific Reports
Silicified wood serves as a crucial geological archive, recording significant information about palaeoenvironment, palaeoecology, palaeontology and diagenetic conditions.
Wenqing Liu, Guanghai Shi, Zhiguang Zhou, Linli Qin, Xinling Li, Xiaoyun Quan, Ye Yuan, Tobias Häger, Anne Jantschke, Roman Botcharnikov   +9 more
doaj   +1 more source

About sign-constancy of Green's functions for impulsive second order delay equations [PDF]

Opuscula Mathematica, 2014
We consider the following second order differential equation with delay \[\begin{cases} (Lx)(t)\equiv{x''(t)+\sum_{j=1}^p {b_{j}(t)x(t-\theta_{j}(t))}}=f(t), \quad t\in[0,\omega],\\ x(t_j)=\gamma_{j}x(t_j-0), x'(t_j)=\delta_{j}x'(t_j-0), \quad j=1,2 ...
Alexander Domoshnitsky, Guy Landsman, Shlomo Yanetz   +2 more
doaj   +1 more source

About sign-constancy of Green’s function of a two-point problem for impulsive second order delay equations

Electronic Journal of Qualitative Theory of Differential Equations, 2016
We consider the following second order differential equation with delay $$ \begin{cases} \begin{split} (Lx)(t)&\equiv{x''(t)+\sum_{j=1}^p {a_{j}(t)x'(t-\tau_{j}(t))}+\sum_{j=1}^p {b_{j}(t)x(t-\theta_{j}(t))}}=f(t), & t\in[0,\omega] \end{split} \\ x(t_k)=
Alexander Domoshnitsky, Guy Landsman, Shlomo Yanetz   +2 more
doaj   +1 more source

Mineral associations in the rocks and metamorphism conditions of the Kandalaksha gabbro-anorthosite massif (Kola Peninsula)

Литосфера, 2016
The composition of mineral associations was studied in the main varieties of the rocks within the metamorphosed Kandalaksha gabbro-anorthosite massif in the southern part of the Kola Peninsula.
V. V. Chashchin, E. N. Steshenko, Ye. E. Savchenko, Ya. A. Pakhomovsky, A. V. Bazai   +4 more
doaj  

Positive solutions for boundary value problems of a class of second-order differential equation system

Open Mathematics, 2023
This article discusses the existence of positive solutions for the system of second-order ordinary differential equation boundary value problems −u″(t)=f(t,u(t),v(t),u′(t)),t∈[0,1],−v″(t)=g(t,u(t),v(t),v′(t)),t∈[0,1],u(0)=u(1)=0,v(0)=v(1)=0,\left\{\begin{
Wang Dan, Li Yongxiang, Su Yi
doaj   +1 more source

Multiple homoclinic solutions for p-Laplacian Hamiltonian systems with concave–convex nonlinearities

Boundary Value Problems, 2020
The multiplicity of homoclinic solutions is obtained for a class of the p-Laplacian Hamiltonian systems d d t ( | u ˙ ( t ) | p − 2 u ˙ ( t ) ) − a ( t ) | u ( t ) | p − 2 u ( t ) + ∇ W ( t , u ( t ) ) = 0 $\frac{d}{dt}(|\dot{u}(t)|^{p-2}\dot{u}(t))-a(t)|
Lili Wan
doaj   +1 more source

Two Phases of Metamorphism in the High-Pressure Schists in Central Inner Mongolia, China: Implications for the Tectonic Transition From Terminal Subduction of the Paleo-Asian Ocean to Continental Collision

Frontiers in Earth Science, 2022
High-pressure (HP) rocks exhumed from subduction zones usually record much warmer geotherms than numerical modelling results, as their peak mineral assemblages are always modified during the exhumation process.
Jinrui Zhang, Shuang Tang, Chunjing Wei, Hang Chu, Wenliang Xu, Ling Jiang   +5 more
doaj   +1 more source

Metasomatism and Mélange Development at the Conditions of Modern Deep Slow Slip: P‐T‐t Evolution of Metasomatic Rocks (Pimu'nga/Santa Catalina Island, CA)

Geochemistry, Geophysics, Geosystems
The subduction interface hosts megathrust earthquakes and ductile creep, is fluid‐rich and chemically dynamic, and produces metasomatic rocks that may host episodic tremor and slow slip (ETS).
W. Hoover, C. B. Condit, A. Moser, S. Mulcahy, P. C. Lindquist, V. E. Guevara   +5 more
doaj   +1 more source

Structural deformation and geochronology of the ductile shear zone along the southern margin of the Foping dome, South Qinling

Dizhi lixue xuebao
Objective  A typical granulite–migmatite–gneiss dome developed in the Foping area of the central Qinling orogenic belt. This area is key to studying the metamorphic deformation of continental crust and the Mesozoic tectonic evolution of Qinling.
YU Kecheng, SUN Shengsi, DONG Yunpeng, HUI Bo, CHENG Chao, ZHANG Bin, ZHANG Yining, LI Xinyu   +7 more
doaj   +1 more source