— In this framework, the Beni Bousera peridotite is a low-angle, oblique-slip, shear zone that accommodated simultaneously a belt-parallel displacement component …
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The ultra-slow spreading Oblique 9°-16°E Supersegment of the SW Indian Ridge provides an opportunity to address length scales, timing and origins of mantle chemical and isotopic heterogeneities. Due to extremely slow mantle upwelling, conductive cooling limits mantle melting. Thus, peridotites at the seafloor are expected to represent the closest approach …
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The SWIR has a very oblique segment from 9 o to 14 o E and dredges along this segment recover a high concentration of peridotite and a comparatively low level of basalt (Fig. 2b).
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— The Horoman Peridotite Complex is an Alpine-type orogenic peridotite massif in the Hidaka metamorphic belt, Hokkaido, Northern Japan. Because of wide exposure and extremely limited serpentinization, the complex provides important information on uplift and emplacement processes of an Alpine-type peridotite massif into the crust.
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— A brief petrographic study by Michibayashi et al. (2006) reported oblique foliation and the thickness of an anisotropic layer from mineral CPO. In this paper, we present a detailed microstructural analysis of peridotite xenoliths with the aim of understating the evolution of the uppermost mantle during back-arc spreading; in …
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— (a) Simplified map of the Rif^Betic mountain belt showing the location of the Beni Bousera (BB) and Ronda (R) peridotite bodies. (b) Simplified geological map of the Internal Zones of the Rif belt.
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— The Horoman Peridotite Complex is one of the Alpine-type peridotite massifs located in the southwestern margin of the Hidaka metamorphic belt (Fig. 1).The complex is approximately 8×10 km in size, and contains mountains such as Mt. Apoi, Mt. Yoshida, Mt. Pinneshiri and Mt. Bozu (Fig. 2).The complex is in fault contact with the mylonitized …
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This demonstrates that, unlike oblique slow-spreading ridges, these two fault sets form and operate independently. The highly unfavourable orientations for brittle failure of the major boundary faults at the oblique amagmatic segments imply that strain is localized by preexisting structures formed outside the brittle deformation field.
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— In order to determine whether peridotites and basalts from mid-ocean ridges record congruent information about the fO2 of the Earth's interior, we analyzed 31 …
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Ichinomegata peridotite xenoliths have clear oblique foliations, except for sample I708 (Fig. 7a). The angle between the foliation defined by pyroxene compositional banding and the SPO of olivine is constant around 20° (Figs. 5a, 7a), indicating that these could be steady-state microstructures. The so-called 'oblique foliation' is a ...
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— The ultra-slow spreading Oblique 9°-16°E Supersegment of the SW Indian Ridge provides an opportunity to address length scales, timing and origins of mantle chemical and isotopic heterogeneities.
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Oblique fractures respond well to treatment, and there are lots of options to make sure your bones and body heal properly. Make sure you talk to your healthcare provider about how you can keep your bones strong and healthy, and get regular bone density screenings if you're older than 50 or have a family history of osteoporosis.
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— The western Alboran peridotite bodies were back-rotated in their initial position at 20 Ma using (1) paleomagnetic data and (2) structural constraints for an ~100 km west/southwestward displacement of the Alboran Domain. ... On these bases, we propose an oblique rift system elongated N-S, with several NW-SE rift axes connected by NNE …
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Detailed structural and petrological mapping in the Beni Bousera peridotite (Rif Belt, northern Morocco) shows that this orogenic peridotite massif is composed of four tectono-metamorphic domains with consistent kinematics, marked by a pervasive, shallowly dipping foliation with a NW–SE stretching lineation that progressively rotates towards a …
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— This study summarizes research progresses in terms of subduction-related peridotite massifs, including supra-subduction zone (SSZ) ophiolites and mantle-wedge …
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Detailed structural and petrological mapping in the Beni Bousera peridotite (Rif Belt, northern Morocco) shows that this orogenic peridotite massif is composed of four tectono-metamorphic domains with consistent kinematics, marked by a pervasive, shallowly dipping foliation with a NW-SE stretching lineation that progressively rotates towards a NNE …
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— We find that, on average, basalts and peridotites from the Oblique Segment both reflect a source mantle very near the quartz–fayalite–magnetite (QFM) buffer. However, peridotites record a significantly wider range of values (nearly 3 orders of magnitude in f O2), with a single dredge recording a range in f O2 greater than that …
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— Such characteristics can only be explained by initial melting of a garnet peridotite followed by low degrees of melting in the stability field of spinel peridotite. The residual garnet signature requires either a high potential temperature of the upwelling mantle, or elevated solidus-lowering water contents. ... Oblique spreading reduces the ...
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— The oblique supersegment is classified as ultraslow, being devoid of AVR, and having instead localized volcanic centers (Joseph Mayes Seamount, Narrowgate cross-axis high) and ridge-parallel mantle peridotite blocks in the rift valley while the orthogonal supersegment, east of 16°E, is classified as slow.
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— Oblique subduction is common in arc–trench systems, suggesting that F-type peridotite formation may be common within the mantle wedge. Location of Batan in the Luzon --- Taiwan arc and the Iraya ...
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— Mantle low and melting underneath oblique and ultraslow mid-ocean ridges. ... the ridge axis becomes sufficiently cold that peridotite blocks are emplaced directly at the seafloor and volcanism is ...
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— Quick overview and properties. Name: Peridotite Rock type: Igneous Origin: Intrusive or plutonic Chemical composition: Ultramafic Color: Mostly light to dark green but may be greenish gray, pale yellow-greenish, red, dark grayish, brownish-black to nearly black, and rarely bluish. Texture: Coarse-grained or phaneritic, with some having a …
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— Peridotite is a type of ultramafic igneous rock that is composed primarily of the mineral olivine, along with smaller amounts of other minerals such as pyroxenes and amphiboles. It is typically dark …
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— We recovered a long (1268-meter) section of serpentinized abyssal mantle peridotite interleaved with thin gabbroic intrusions. We find depleted compositions with …
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89-17 mylon.peridotite 89-21 harzburgite 84 13 612 89-24 lherzolite 74 20 5 1 89-25 harzburgite 70 25 4 1 89-27 harzburgite 71 25 3 1 89-28 lherzolite 64 25 10 1 89-30 harzburgite 70 26 3 1 PS55-D90: 80‡54.5PN, 2‡27.4PW; WD 3950^3500 m 90-14 mylon.peridotite 90-19 mylon.peridotite 90-20 harzburgite 83 total px: 16 1 90-21 …
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— Abstract. A detailed structural study in Alpine-type peridotites of the ultramafic Voltri Massif in NW Italy reveals the existence of oblique fabrics in porphyroclastic …
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peridotite, and have weak magnetization and a relatively positive MBA. The basic accretion unit appears to be mantle horst blocks ... oblique amagmatic segment from 118 300 to 148 240 E, oriented ...
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convergence. Oblique convergence probably resulted from the initial obliquity between the subduction trench and the continental ribbon that became incorporated in it. This obliquity can solve the paradox of the Peridotite Nappe seemingly being emplaced at the same time the high-pressure rocks were exhumed.
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— Abyssal peridotites are the depleted solid residues of mantle melting that are exposed on the seafloor at ocean ridges. Due to their geochemically depleted character and the scarcity of seafloor samples, …
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Slab melting beneath the Cascade Arc driven by dehydration of altered oceanic peridotite. KJ Walowski, PJ Wallace, EH Hauri, I Wada, MA Clynne. Nature Geoscience 8 (5), 404-408, 2015. 114: ... Effects of oblique subduction and 3-D slab geometry. I Wada, J He, A Hasegawa, J Nakajima. Earth and Planetary Science Letters 426, 76-88, 2015. 62:
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— The structural analysis of the metamorphic belt and allochthonous terranes, which represent the lower and upper plates of the Eocene subduction/obduction complex of New Caledonia respectively, unravels a multi-step evolution. At subduction inception, the originally N-S trending northern Norfolk/New Caledonia Ridge was moving northward as …
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What is Peridotite? 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. Their silica content is low compared to other igneous rocks, and they contain very little quartz and feldspar.
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