Mafic plutonic rocks consist of isotropic and layered gabbros. Geochemical studies show that these rocks have subalkalic tholeiitic affinity. Partial melting has been an important process in the formation of the studied rocks. Normalized trace element patterns in the studied rocks show enrichment in ...
Canadian Journal of Earth SciencesPatchett, P. J., G. E. Gehrels, and C. E. Isachsen (1998), Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia, Canadian Journal of Earth Sciences, 35(5), 556-561....
The Cenozoic magmatic rocks of shoshonitic series in eastern Qinghai-Tibet plateau include potassic alkaline plutonic rocks, volcanic rocks, lamprophyres and acidic porphyries. Mica is the popular mineral in the four different types of rocks. Based on the geochemical characteristics of mica in rocks...
In Stara planina Mts., Bulgaria the Buhovo-Seslavtzi pluton is built up of potassic monzonites and quartzsyenites, which contain calcic pyroxenes and amphiboles, plagioclase and potassium feldspar. The plutonic rocks are accompanied by d... AB Thompson - 《Chemical Geology》 被引量: 0发表: ...
A classification of volcanic and plutonic rocks using R 1–R 2 diagrams and major element analysis-its relationships and current nomenclature[J]. Chem Geol, 1980, 29: 183–210. Article Google Scholar Vosoughi Niri I. Mass and chemical changes of immobile elements in Yamaghan Occurrence, Zanja...
Considering regional tectonic sedimentary evolution and previous research results, the authors hold that the volcanic rocks of the Qushenla Formation were probably related to the slab break-offduring southward subduction of the Bangong Co-Nujiang oceanic crust in the Early Cretaceous, and were ...
Mineralized zones in the southern Absaroka Mountains, Wyoming, are confined to a belt of intrusive rocks extending approximately 100 kilometers along the northwest-trending central axis of the Absaroka volcanic field. Plutonic rocks within this belt are calc-alkalic and include basalt, andesite, ...
five wells located in the Lower Yangtze to South Yellow Sea area, and the element content were compared with those of the sediments in the modern upwelling area of Peru, from which the hydrocarbon generation potential of the GFF siliceous source rocks in the SYS and its origin were revealed....
observed, such as La2O3ranging from 0.02 to 0.17 and Nb2O5from 0.44 to 1.07 wt.% (Table3). Fe/Al ratios (> 0.5) in the studied titanite (Table3) point toward their derivation from silica-undersaturated magma forming plutonic rocks such as Sung Valley ijolites in the present case ...
U Pb ages on zircons from several types of sialic rocks, together with a variety of geochemical data on one sample of early plutonic activity within the Egyptian Shield are presented. The earliest autochthonous granitic rocks in the Egyptian Shield are probably quartz diorites (tonalites) ...