نتایج جستجو برای: plutonic rock
تعداد نتایج: 39311 فیلتر نتایج به سال:
Sorkheh Dizaj apatite - iron oxide deposit is located in southeast of Zanjan, within the Tarom subzone of Western Alborz - Azarbaijan structural zone. The oldest units in the area are Eocene trachyte, trachyandesite, olivine basalt and volcanoclastic brecciated tuff and lapilli tuff intruded by a quartz-monzonite, monzonite and granite subvolcanic pluton of Late Eocene - Early Oligocene age. Th...
چکیده ندارد.
The chemical and isotopic compositions of volcanic arc lavas often show evidence for involvement a sedimentary component during magma genesis. Determining where this is added to magmas vital importance constraining the extent which sediments volatiles are recycled at subduction zones. Lavas from Martinique in Lesser Antilles have wide ranging extending highly radiogenic values (e.g. 87 /Sr/ 86 ...
[1] The oxygen and hydrogen isotope compositions of vein minerals and dO values of 64 whole rocks from the deeper kilometer of the 1.5 km lower crustal section of ODP Hole 735B in the SW Indian Ocean were analyzed in order to investigate seawater penetration into and reaction with the lower oceanic crust. Vein amphiboles have dD values of 35 to 65%, indicating formation from seawater fluids and...
چکیده ندارد.
Abstract Bulk rock geochemistry and sensitive high-resolution ion microprobe zircon geochronology of igneous metaigneous rocks the Évora gneiss dome, located to north reworked Rheic Ocean suture zone in southwest Iberian Variscan belt, reveal a succession magmatic melting events lasting ~30 m.y. between ca. 341–314 Ma. The study detailed field relationships orthomigmatites (i.e., migmatites fro...
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