Peridotite - Wikipedia
网页Peridotite (US: / ˈ p ɛ r ɪ d oʊ ˌ t aɪ t, p ə ˈ r ɪ d ə-/ PERR-ih-doh-tyte, pə-RID-ə-) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica.
Peridotite | Properties, Composition, Formation - Geology Science
网页2023年9月4日 · Definition and composition of peridotite. Peridotite is a type of ultramafic igneous rock that is primarily composed of the mineral olivine, along with smaller amounts of other minerals such as pyroxenes and amphiboles. It is one of the main rock types found in the Earth’s mantle, which is the layer of the Earth that lies below the crust.
Peridotites, chromitites and diamonds in ophiolites - Nature
网页2021年2月16日 · In this Review, we discuss the major features of mantle peridotite from both ophiolites and modern oceanic lithosphere to understand the feasibility of tectonic discrimination based on the...
Peridotite | Mantle, Igneous, Ultramafic | Britannica
网页Peridotite, a coarse-grained, dark-coloured, heavy, intrusive igneous rock that contains at least 10 percent olivine, other iron- and magnesia-rich minerals (generally pyroxenes), and not more than 10 percent feldspar. It occurs in four main geologic environments: (1) interlayered with iron-,
The life cycle of subcontinental peridotites: From rifted continental ...
网页At the Iberian margin, geophysical images, ocean drilling, and submersible dives identified the Galicia Ridge (offshore western Spain), an uplifted partially serpentinized subcontinental peridotite, as the structure marking the ocean-continent transition (OCT) (Boillot et al., 1995; Dean et al., 2000).
Frontiers | Atomic structure and physical properties of peridotite ...
网页2023年3月19日 · Given the NBO/Ts of the present peridotite glasses, their atomic structure should mostly be composed of Q 2 units, with lower fractions of Q 1 and Q 3 units (e.g., see Maekawa et al., 1991). Considering that the peridotite glasses are also rich in MgO (38 wt%), a similar Q-species distribution to that of MgSiO 3 glass, with NBO/T = 2.00, might ...
Peridotite - SpringerLink
网页2014年1月1日 · Peridotites are the main lithology of the Earth’s upper mantle. According to the IUGS classification (Le Bas and Streckeisen, 1991), they are defined as a coarse-grained ultramafic rock type, containing more than 40 % olivine. Other minerals that coexist with olivine are low-Ca orthopyroxene (opx), high-Ca clinopyroxene (cpx), and chromian ...
Peridotite: Igneous Rock - Pictures, Definition & More - Geology.com
网页Peridotite is a generic name used for coarse-grained, dark-colored, ultramafic igneous rocks. Peridotites usually contain olivine as their primary mineral , frequently with other mafic minerals such as pyroxenes and amphiboles.
网页2021年2月16日 · Formation of chromitites in ophiolites. The presence of diamond and other UHP minerals in the peridotite mantle section of ophiolites raises several questions and challenges about the traditional...
The roles of pyroxenite and peridotite in the mantle sources
网页2017年6月12日 · We show that the observed olivine compositions are consistent with melts of fertile peridotite at various pressures—importantly, melts from metasomatic pyroxenites are not required.
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