نتایج جستجو برای: island arcs

تعداد نتایج: 63955  

آلیانی, فرهاد, صبوری, زهرا, معانی‌جو, محمّد, میری, میرمحمّد,

The Kangareh gabbro body is located in south of the Kurdistan Povince and southwest of the Qorveh area. The area belongs to the Sanandaj-Sirjan zone. Tectonic evolutions during Mezozoic and magmatism, due to subduction of the Neo-Tethys oceanic lithosphere beneath the Iran microplate, led to formation of various igneous bodies in this area. Chemical analysis of pyroxene minerals and whole rock ...

Journal: :Frontiers in Earth Science 2023

The Tarim basin is a large composite and superimposed sedimentary that has undergone complex multi-period polycyclic tectonic movements. Understanding the proto-type tectono-paleogeographic evolution of this important for understanding basin-mountain coupling dynamical mechanisms Paleo-Asian Tethys systems as well hydrocarbon exploration development. Based on previous works, together with recen...

2006
Jack B. Fisher Thomas E. Marler

A single 1.41-m-long trunk of Cycas micronesica K.D. Hill was found growing horizontally in natural habitat on the island of Guam. Transverse sections of the trunk showed enhancement of secondary vascular tissues on the lower side by the production of more arcs of accessory vascular cambia and more parenchyma as compared to the upper side. Xylem tracheids were similar in upper and lower sides. ...

Journal: :Vestnik geonauk 2023

We refined the age of carbonate and clastic volcanomictic rocks Toupugol'egart Formation (D1–2tg) Voikar Belt Polar Urals, which formed at final stage Ural Island arc development. The analysis stratigraphic distribution fossils was based on a revision previously published data new collections authors (algae, tabulatomorphic corals). range extended up to Karpinsky-Langur regional stages Emsian E...

2014
L. Karlstrom C.-T. A. Lee M. Manga

Volcanic activity at convergent plate margins is localized along lineaments of active volcanoes that focus rising magma generated within the mantle below. In many arcs worldwide, particularly continental arcs, the volcanic front migrates away from the interface of subduction (the trench) over millions of years, reflecting coevolving surface forcing, tectonics, crustal magma transport, and mantl...

2006
Shaji K. Nair Stephen S. Gao Kelly H. Liu Paul G. Silver

[1] Stacking of approximately 1500 radial receiver functions recorded at about 80 broadband seismic stations deployed in southern Africa reveals systematic spatial variations in the ratio of crustal P and S wave velocities (F), crustal thickness (H), and the amplitude of the converted Moho phases (R). The eastern Zimbabwe and the southern Kaapvaal cratons are characterized by small H ( 38 km), ...

Journal: :Frontiers in Marine Science 2022

Sea slug (Subclass Heterobranchia) biodiversity is an important element of marine coral reef communities. However, due to their small size and cryptic behavior, few studies have examined spatiotemporal variation. Taiwan in the middle East Asia Island Arcs, where it one hotspots sea diversity. Meanwhile, northeast coast this island lies within subtropical monsoon region, climate shifts from a wa...

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