Xenolith - Wikipedia
A xenolith ("foreign rock") is a rock fragment (country rock) that becomes enveloped in a larger rock during the latter's development and solidification. In geology, the term xenolith is almost exclusively used to describe inclusions in igneous rock entrained during magma ascent, emplacement and eruption. [1]
Roles of xenomelts, xenoliths, xenocrysts, xenovolatiles, residues, and ...
2017年11月1日 · If skarns, residues, xenoliths, xenocrysts, xenomelts, and/or xenovolatiles are present, they provide important constraints on ore genesis and they are valuable exploration indicators, but they must be included in elemental and isotopic mass balance calculations.
Xenoliths / Xenocrysts - Earth Sci
A xenolith is a piece of rock trapped in another type of rock. Most of the time, a xenolith is a rock embedded in magma while the magma was cooling. Xenoliths are different types of rock embedded in igneous rock. Xenoliths are torn from deep cracks, or pipes, in the Earths surface.
What are Xenocrysts and How Are They Important? - Geology Base
2023年12月7日 · Xenocrysts refer to mineral crystals trapped or caught up in an igneous rock. These crystals are foreign (alien) to the rock they occur in. By foreign, we mean they didn’t crystallize from the melt that formed the rocks that have them. Thus, their origin is not the same as the igneous rock. Instead, they are incorporated into the melt.
Xenolith - Education | National Geographic Society
2024年4月24日 · Crystals that are torn from the sides of magma pipes are called xenocrysts. As magma erupts or flows from Earth's surface, it is cooled by exposure to air or water. Lava cools fairly quickly, and various types of igneous rocks are formed. Xenoliths are usually visible. They have a different color and density than the surrounding igneous rock ...
北地科学-中国地质大学（北京）
2024年4月16日 · 基于穿地壳岩浆系统的理论，陆内长英质岩浆储库多由不同批次的间隙熔体和挥发相组成，它们裹挟着不同来源的多世代晶体，包括正晶（orthocrysts）、再循环晶（antecrysts）、转熔晶（peritectic crystals）和捕掳晶（xenocrysts），共同组成了“晶粥体系”。. …
Xenocryst | geology | Britannica
…phenocrysts are referred to as xenocrysts, while the aggregates can be termed xenoliths. The size of phenocrysts is essentially independent of their abundance relative to the groundmass, and they range in external form from euhedral to anhedral.
Water in upper mantle pyroxene megacrysts and xenocrysts: A …
2011年8月1日 · Water content, mineral chemistry, and oxidation state of clino- and orthopyroxene xenocrysts and megacrysts were investigated by Fourier transform infrared (FTIR) spectroscopy—including focal plane array (FPA) detector mapping, Mössbauer spectroscopy, and electron microprobe.
ASSIMILATION OF XENOCRYSTS IN GRANITIC MAGMAS: …
2007年2月1日 · Country-rock materials, either as intact xenoliths or as disaggregated xenocrysts, are inevitable contaminants in granitic magmas. Xenocrysts approach chemical equilibrium with the granitic magma in several ways. Two pre-assimilation reactions may change the nature of the material being assimilated: redox, involving ferromagnesian silicates ...
Chemistry and Sr-Nd isotope signature of amphiboles of the …
2018年7月1日 · Amphibole phenocrysts, xenocrysts and cumulate xenoliths from Cenozoic volcanic rocks of the Bohemian Massif (BM) belong to the magnesio-hastingsite–pargasite–kaersutite series. Their host rocks are mostly basaltic lavas, stocks, dykes and breccia pipe fills, less commonly also felsic rocks.
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