A discontinuous, elongate zone of mafic and ultramafic plutonic rock crops out in south-central Alaska for a distance of more than 1000 km. Intermediate... LE Burns - 《Can.j.earth Sci》 被引量: 88发表: 1985年 Tracing the evolution and distribution of F and Cl in plutonic systems fro...
This study presents whole-rock major and trace element analyses of volcanic rocks and sills of the BNC to establish their composition and geological setting, and two new U–Pb zircon ages from a rhyolite lava and a rhyolite sill to determine the age of the BNC. In addition, 40Ar/39Ar step...
Because most writers can see no intrinsic reason for this (R.H.Mitchell 1986, p.43 found the absence of 'plutonic kimberlite' particularly strange), this raises the question of whether other named plutonic or volcanic rock-types might be equivalent to lamprophyres. The old suggestion that LL ...
A comparison between Palaeoarchaean volcanic and plutonic rocks of the eastern Kaapvaal craton allows linking the volcanic and plutonic records. Given the distinctive compositional differences between major intrusive rock types (TTG and GMS series), volcanic rocks can be likened to either one or the ...
Common Solidified Extrusive Rock Solidified Plutonic (Intrusive) Rock Volcanic Features Chemical Composition Dry Solidus T (°C) Dry Liquidus T (°C) Ultramafic Komatiite Peridotite Large, but thin lava flows and shield volcanoes (Archean age) <45% SiO2, high in Mg, Fe, Ca 1150246 1500–16502...
1) volcanic plutonic rock zone 火山-深成岩带 2) volcanic rock zone 火山岩带 1. Three kinds of rhyolites are controlled by the core faults of the volcanic rock zone and the late volcanic structure. 本文介绍的火山岩带,有层状流纹岩及穹丘状、岩颈状等非层状流纹岩,分别属溢流相、侵出相及...
The Rio Capim greenstone belt is composed of a rock assemblage with trace element and Nd isotope geochemical signatures that are indistinguishable from arc rocks. The dominance of basalt, andesite and dacite is more typical of oceanic rather than of continental arcs (e.g. Condie, 1997). The ...
Vintage Rock Formation of Plutonic Bodies and Volcanic Extrusive,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行
Additionally, plagioclase comb layering and orbicular rocks showing similar growth conditions as plagioclase glomerocrysts, imply that certain types of vertical, plutonic layering might form on volcanic timescales. CRediT authorship contribution statement A.Mc. and J.B. designed the research. P.V. ...
TiO2 (d) SiO2 vs. K2O for felsic volcanics of the Siang window, Eastern Himalaya. A.K. Singh, R.K. Bikramaditya Singh / Geoscience Frontiers 3(5) (2012) 613e634 629 at least were derived by partial melting of a similar source composition to that of the mafic volcanic rock (PRO117...