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Hace 4 días · Earth's lithosphere, the rigid outer shell of the planet including the crust and upper mantle, is fractured into seven or eight major plates (depending on how they are defined) and many minor plates or "platelets".
Hace 5 días · Our research results offer new constraints on the crust and upper mantle structure in Northeast China, contributing to the understanding of the geodynamic context underlying the differential structures between the CAOB and the NCC and the characteristics of their boundaries.
Hace 5 días · Abstract We determined the velocity structure of the upper crust in the Jiaodong area using double difference seismic tomography, and found that the Jiaodong inland area near the surface (0–5 km) is mainly characterized by high-velocity anomaly, and there are several obvious low-velocity anomalies in the Bohai Sea. The Queshan metamorphic core complex shows obvious low-velocity anomaly at ...
Hace 1 día · Approximately 46% of diatom species survived the transition from the Cretaceous to the Upper Paleocene, a significant turnover in species but not a catastrophic extinction. The occurrence of planktonic foraminifera across the K–Pg boundary has been studied since the 1930s.
Hace 2 días · Therefore, investigating the velocity model and radial anisotropy structure of the upper crust in this region can help us better understand the deformation characteristics of the shallow crust (< 10 km) in the Weifang segment of the Tanlu fault zone and evaluate the likelihood of earthquakes.
Hace 4 días · The outermost layer of the lithosphere is called the crust. It is composed of low-density material crystallized from molten rock (magma) produced by partial melting of the lithosphere or asthenosphere. The average thickness of the oceanic crust is about 4 miles (6.4 km).
Hace 5 días · The Cretaceous is divided into Early and Late Cretaceous epochs, or Lower and Upper Cretaceous series. In older literature, the Cretaceous is sometimes divided into three series: Neocomian (lower/early), Gallic (middle) and Senonian (upper/late).
