نتایج جستجو برای: peridotite
تعداد نتایج: 891 فیلتر نتایج به سال:
The Ronda peridotite (Betic Cordillera, Southern Spain) is the largest alpine-type massif worldwide. Yet, emplacement mechanism of these mantle rocks still a highly debated topic. In this study, we aim at better constraining their context exhumation by focusing on Nieves Unit, which mostly composed Mesozoic metasediments displaying HT metamorphism and deformation along contact with peridotite. ...
Current theories suggest that the first continental crust on Earth, and possibly other terrestrial planets, may have been produced early in their history by direct melting of hydrated peridotite. However, conditions, mechanisms necessary ingredients for this crustal formation remain elusive. To fill gap, we conducted time-series experiments to investigate reaction serpentinite with variable pro...
It is widely assumed that mineral inclusions and their host diamonds are 'syngenetic' in origin, which means that they formed simultaneously and from the same chemical processes. Mineral inclusions that, instead, were formed earlier with respect to diamonds are termed protogenetic. However, minerals can have the same age as the diamonds in that they become enclosed in and isolated from any furt...
Background/Overview: Most differentiated rocky worlds in our Solar System have mantles of olivine, pyroxene, spinel, and calcic plagioclase (or equivalent high-pressure phase assemblages). Earth’s mantle peridotite and similar rocks in other silicate planets and asteroids normally melt to form basaltic magma, komatiite, or other olivinenormative melts. Details of planetary mantle compositions a...
The serpentinite-hosted Lost City hydrothermal field is a remarkable submarine ecosystem in which geological, chemical, and biological processes are intimately interlinked. Reactions between seawater and upper mantle peridotite produce methane- and hydrogen-rich fluids, with temperatures ranging from <40 degrees to 90 degrees C at pH 9 to 11, and carbonate chimneys 30 to 60 meters tall. A low d...
Ultramafic soils are originated from ultramafic rocks such as peridotite and serpentinite highly enriched in metals (e.g., Ni, Cr, Co) depleted plant nutrients P, K, Ca). Such characteristics make these unfavorable for agriculture have raised environmental concerns on metal release to the environment. From another perspective, host a diverse flora with higher endemism than surrounding non-ultra...
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