نتایج جستجو برای: plutonic rock

تعداد نتایج: 39311  

2017
Leif Karlstrom Scott R. Paterson Mark Jellinek

Direct constraints on the ascent, storage and eruption of mantle melts come primarily from exhumed, long-frozen intrusions. These structures, relics of a dynamic magma transport network, encode how Earth’s crust grows and di erentiates over time. Furthermore, they connect mantle melting to an evolving distribution of surface volcanism. Disentangling magma transport processes from the plutonic r...

2008
A. A. SEPAHI

The study area is a part of the Sanandaj-Sirjan metamorphic belt comprising lowto high-grade regional and contact metamorphic rocks that are intruded by various plutonic bodies. Garnet crystals are abundant in pelitic schists, amphibole schists, migmatites, hornfelses and aplites. They are mostly almandinerich (XAlm>60) pyralspite garnets and show dodecahedron, trapezohedron and mixed (dodecahe...

2015
Jeffrey H. Tepper Scott M. Kuehner

Mafic enclaves from three plutons in the Chilliwack batholith have been compared with contemporaneous mafic stocks in order to determine (1) the processes by which mafic and felsic magmas hybridize in the plutonic environment and (2) whether analysis of early-formed enclave minerals, particularly apatite, can provide a means of seeing through hybridization effects and deciphering the original t...

2015
Sarah J. Brownlee Joshua M. Feinberg Takeshi Kasama Richard J. Harrison Gary R. Scott Paul R. Renne

[1] Paleomagnetic studies of the 91 Ma Ecstall pluton and other Cretaceous plutons of British Columbia imply large northward tectonic movements (>2000 km) may have occurred during the tectonic evolution of western North America. However, more recent studies have shown that the eastern edge of the Ecstall pluton experienced considerable mineralogical changes as younger Eocene plutons, such as th...

احدنژاد, وحید, قربانی, منصور , رسولی, جمال ,

Jebale-Barez plutonic complex is composed of granitoid intrusive bodies and is located in the east- northeast Jiroft, southeastern Kerman Province. The plutonic complex is composed of granodiorite, quartzdiorite and granite - alkaligranite. The Plutonic rocks are mainly composed of plagioclase, alkali-feldspar, biotite, amphibole and quartz. Based on microprobe analysis, plagioclase composition...

Journal: :International Journal of Geophysics 2023

With the properties of laterites being related to nature rock from which they are derived, twenty vertical electrical surveys and boreholes for geotechnical tests, distributed in two units (plutonic green belt zones) Ntem complex located at northern limit Congo Craton, were implemented study formation process this geological structure. The inversion geoelectrical data plutonic area resulted thr...

اعتمادی, بیژن, تقی‌پور, بتول, قبادی, عبدالهادی,

Nodoushan clay deposit is located about 130km southwest of Yazd city in the Uromieh-Dokhtar volcano-plutonic belt. Based on the field, mineralogical and geochemical studies, the rocks of Nodoushan area are of volcanic type and are composed of dacite, andesite and olivine-basalt, the pyroclastic type (crystalline tuff), and the microgranodioritic intrusive rocks. According to Zr/TiO2 versus SiO2...

Journal: :Geosphere 2022

Abstract We reject the notion of a Jurassic continental arc in eastern Mexico, termed “Nazas arc,” on geologic grounds. Instead, we propose that SW Cordilleran U.S. and northern Sonora, passed southward into oceanic realm is represented by volcanic plutonic rocks fringed Mexican paleo-Pacific margin, which are currently found western Peninsular Ranges southern California, USA, Baja Vizcaino Pen...

Journal: :Journal of the Japan Society of Engineering Geology 1974

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