| Michard, André, Feinberg, Hugues, El-Azzab, Driss, Bouybaouene, Mohamed, Saddiqi, Omar (1992) A serpentinite ridge in a collisional paleomargin setting: the Beni Malek massif, External Rif, Morocco. Earth and Planetary Science Letters, 113 (3) 435-442 doi:10.1016/0012-821x(92)90144-k | Journal (article/letter/editorial) | 75231 Paris Cedex 05, France b Facult# des Sciences, D~partement des Sciences de la Terre, BP 1014, Rabat...northern Morocco the Beni Malek serpentinised peridotite massif is included in a low-grade metasedimentary...marginal sedimentary prism. We connect the ultramafic outcrop with a regional, N E - S W trending magnetic anomaly...du CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France. dotites are also found. By contrast, in the BeticMaghrebide...In this paper we focus on a serpentinised peridotite outcrop, the Beni Malek massif in the Eastern Rif | | | Report (issue) | MARYLAND. By ELEANORA BLISS KNOPF. INTRODUCTION. Chromite occurs in numerous areas of serpentine throughout...eastern Pennsylvania and Maryland, in which the chromite deposits are situated, is gentle and rolling....already led him to recognize the occurrence of chromite at Bare Hills, 6 miles Mine or prospect FIGURE...became the site of the Heed mine. In this mine chromite formed several lenses, the largest of which was...was about 100,000 tons.2 Tyson had noticed that chromite is associated with serpentine, and by further | | | Report (volume) | Survey, a description of the Corundum and the Peridotite Deposits of Western North Carolina, pre¬ pared...Topographic forms. Superficial aspects . Ecology of the peridotite areas. 61 62 64 Chapter III.—-Petrography of...County, North Carolina. Elf dunite. Elf amphibole-peridotite. Elf troctolite. Elf amphibolite. Elf gabbro...area. Buck Creek dunite. Buck Creek amphibole-peridotite. Buck Creek troctolite and olivine-gabbro. Corrosion...Glenville. Harzburgite on Big Ridge. Amphibole-peridotite of Shoal Mountain. Vicinity of French Broad River | | | Journal (article/letter/editorial) | in garnet- and spinel-bearing high-temperature peridotite bodies in the southern Bohemian massif (lower...composition similar to harzburgites at the same outcrop (QOsi of 32.7 to 33.9), the change in QOsi requires...However, in some recent studies of lithospheric peridotite xenoliths, model age results cannot be related...the interaction with melt or £uid. Studies of peridotite xenoliths from convergent plate margins yielded...small-scale introduction of Re and radiogenic Os in peridotite xenoliths from Tanzania by in¢ltrating silicate | | | Report (issue) | 1818 00016298 0 2 t P^ 3 The Yellow Dog Peridotite and A Possible Buried igneous Complex of Lower...Yellow Dog Peridotite 2.--Electron microprobe anJyses of olivines from the Yellow Dog Peridotite 3.--Electron...from the Yellow Dog Peridotite 4.--Trace element content of the Yellow Dog Peridotite 5.--Comparison of...for average ultraniafic rocks and Yellow Dog Peridotite 6.--Summary of data and interpretation of anomalies... ' I i! c. Abstract Partly serpentinized peridotite of early Keweenawan age crops out in two places | | | Journal (article/letter/editorial) | Abstract: Mg-Fe2+ diffusion patterns in olivine and chromite are useful tools for the study of the thermal...transformation into ferrian chromite produced “fake” diffusion patterns within chromite. The absence of diffusion...and resistant to alteration, and in the case of chromite, among the first phases to crystallize [1–3]....equilibrium is the “r” factor [olivine/(olivine + chromite)], first mentioned by Engi [7] and later studied...re-equilibration occurs at low r values, it is the chromite composition that is relatively unaffected by olivine-spinel | | | Journal (article/letter/editorial) | discrete zones within larger bodies of garnet-free, chromite-bearing dunite and are commonly closely associated...eclogites. The dunites of the large Almklovdalen peridotite body have extremely depleted compositions (Mg-number...garnet peridotite *Corresponding author. E-mail: ebeyer@els.mq.edu.au INTRODUCTION Peridotite bodies...2000). Variously called ‘orogenic peridotites’, ‘peridotite massifs’ and ‘alpine-type peridotites’, they...that range in outcrop dimensions from 1 m2 to >100 km2. These tectonically emplaced peridotite complexes | | | Report (volume) | them to be considered a resource. Serpentinized peridotite crops out on some claims in the area, but analyzed...World War I (Trask and others, 1943; Trask, 1950). Chromite deposits in dunite associated with serpentinite...in other parts of the Coast Ranges, and several chromite prospects in serpentinite are reported near Stonyford...produced more than 31,000 metric tons of milled chromite concentrates in 1942, 1943, and 1944 (Dow and...Stonyford, are part of the same volcanic unit. The outcrop area near Stonyford, about 25 km2 , is separated | | Song, Shuguang, Su, Li, Niu, Yaoling, Zhang, Lifei, Zhang, Guibing (2007) Petrological and geochemical constraints on the origin of garnet peridotite in the North Qaidam ultrahigh-pressure metamorphic belt, northwestern China. Lithos, 96 (1) 243-265 doi:10.1016/j.lithos.2006.09.017 | Journal (article/letter/editorial) | geochemical constraints on the origin of garnet peridotite in the North Qaidam ultrahigh-pressure metamorphic...(UHP) metamorphic belt, NW China, a large garnet peridotite massif has been exhumed together with felsic...altogether suggest that the protoliths of the garnet peridotite massif represent rocks from a subarc system in...Elsevier B.V. All rights reserved. Keywords: Garnet peridotite; Cumulate origin; Continental subduction; North...Qaidam UHP belt; NW China 1. Introduction Garnet peridotite is volumetrically small, yet a common component | | | Report (issue) | 17 (see Fig. 1), progressive replacement of peridotite by dolomite was observed below a depth of 29...others, 1911) noted that gabbro (minverite) and peridotite (picrite) were "so intimately associated as to...macroscopic layering, and alternations of gabbro and peridotite were observed by I.G.S. in borehole cores. McDonald...Whether the lampro phyres are coeval with the peridotite, are cut by it or transect it at depth, remains...Such considerations would place the age of the peridotite at about 260 Ma, or perh ap s a little earlier | | Jalil, Raham, Alard, Olivier, Schaefer, Bruce, Ali, Liaqat, Sajid, Muhammad, Khedr, Mohamed Zaki, Shah, Mohammad Tahir, Anjum, Muhammad Naveed (2023) Geochemistry of Waziristan Ophiolite Complex, Pakistan: Implications for Petrogenesis and Tectonic Setting. Minerals, 13 (3) 311 doi:10.3390/min13030311 | Journal (article/letter/editorial) | subsequent geochemical depletion or enrichment of peridotite protoliths. The investigated peridotites are...extraction in the closed system of spinel-bearing peridotite facies at shallow depths above a subduction zone...top, consists of residual peridotites (±dunite ±chromite), ultramafic cumulates, layered to isotropic gabbros...Early Paleogene. This study also focuses on fluid–peridotite interactions and the behavior of elements during...sample collection. A sediments total of 162exist outcrop 18of borehole sampillow Ultramafic and shelf-slope | | | Book | rocks of diamond and other commodities such as Ni. Chromite has long been used as an indicator mineral in...which may host Ni deposits, also contain abundant chromite, which is similar in major-element composition...laserdependent partitioning between ablation ICPMS chromite and olivine. This microprobe (LAMMantle Array...mantle xenocrysts, including chromite. If the chemistry of the chromite xenocrysts trace element can...lithosphere through time. Xenoliths and garnet and chromite xenocrysts from mantle-derived volcanics (eg basalts | | | Journal (article/letter/editorial) | Petrogenesis, alteration, and deformation in mantle peridotite from 14° to 16°N on the Mid-Atlantic Ridge: ODP...between 14° and 16°N we recovered residual mantle peridotite (75%) and evolved gabbroic rocks (25%). These...intrusive relationship to the host residual mantle peridotite and there are abundant gabbroic intrusions present...intensities. At one site, pervasive serpentinization of peridotite has been overprinted by talc mineralization....deformation in residual mantle peridotite is minimal, rather at all sites where peridotite was recovered deformation | | Mazzeo, F.C., Zanetti, A., Aulinas, M., Petrosino, P., Arienzo, I., D’Antonio, M. (2017) Evidence for an intra-oceanic affinity of the serpentinized peridotites from the Mt. Pollino ophiolites (Southern Ligurian Tethys): Insights into the peculiar tectonic evolution of the Southern Apennines. Lithos, 284. 367-380 doi:10.1016/j.lithos.2017.04.019 | Journal (article/letter/editorial) | at the Centres Científics i CE P Tecnològics de la Universitat de Barcelona (CCiTUB), Spain. The volatile...ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) at CNR–Istituto di Geoscienze e Georisorse...rocks point to the occurrence of two different peridotite types (Figs. 4a-4d). The samples EP5, SSL8, SSL9...content shows a notable difference between the two peridotite types (Fig. 5a). Indeed, ACCEPTED MANUSCRIPT...As IP expected according to the increase of chromite component (FeCr2O4) in substitution of spinel | | | Journal (article/letter/editorial) | thickness of about 3 km and is an assemblage of peridotite and gabbro that includes serpentinized harzburgites...issuing from fractures in a 5000 m2 wide ophiolitic outcrop (Fig. 1). At least 20 vents burn continuously,...of Chimaera seep: partial view of the ophiolite outcrop (A), and examples of clusters (B) and isolated...101–104 mg m2 d1) is pervasive throughout the outcrop. (D) measurement of CH4 microseepage (diffuse fluxes...throughout the peridotite outcrop and are often mineralized by carbonates (Fig. 3A and B). The outcrop is, however | | Lapen, Thomas J., Medaris, L. Gordon, Beard, Brian L., Johnson, Clark M. (2009) The Sandvik peridotite, Gurskøy, Norway: Three billion years of mantle evolution in the Baltica lithosphere. Lithos, 109 (3) 145-154 doi:10.1016/j.lithos.2008.08.007 | Journal (article/letter/editorial) | o m / l o c a t e / l i t h o s The Sandvik peridotite, Gurskøy, Norway: Three billion years of mantle...Geothermobarometry Sm–Nd geochronology Western Gneiss Region Peridotite a b s t r a c t The Sandvik ultramafic body,...repeated orogenic/magmatic events. The Sandvik peridotite body and nearby outcrops record four paragenetic...am (high-Al), at 700 °C and 1.0 GPa. A nearby outcrop contains a fourth assemblage consisting of ol+...opx + am. Lu–Hf and Re–Os model ages of garnet peridotite indicate melt depletion at 3.3 Ga [Beyer, E.E | | Consuma, Giulia, Braga, Roberto, Giovanardi, Tommaso, Bersani, Danilo, Konzett, Jürgen, Lugli, Federico, Mazzucchelli, Maurizio, Tropper, Peter (2020) In situ Sr isotope analysis of mantle carbonates: Constraints on the evolution and sources of metasomatic carbon-bearing fluids in a paleo-collisional setting. Lithos, 354. 105334 doi:10.1016/j.lithos.2019.105334 | Journal (article/letter/editorial) | veins having re -p Keywords: Carbon Cycle; peridotite; mantle-wedge; In situ Sr isotope; metasomatism;...multiple metasomatic history of the Ulten Zone (UZ) peridotite (northern Italy) to illustrate the formation... ro spinel-peridotite to high-pressure fine-grained garnet-bearing amphibole-peridotite and, finally...the occurrence of a pale green amphibole in the peridotite matrix (Obata and Morten, 1987). However, Journal...Phlogopite, apatite, dolomite and rare dissakisite-(La) occur as accessories (Tumiati et al., 2007). Fine-grained | | | Journal (article/letter/editorial) | Pb-isotope disequilibrium in distinct populations of peridotite-derived sulfides, with sulfides included within...Os-rich sulfides. This raises the prospect that peridotite-derived melts may not inherit the Os- (or Pb-)...or pyroxenite (or fertile and/or metasomatized peridotite) components is a more likely explanation for...convecting upper mantle, and that upper mantle peridotite is, on average, significantly more depleted and...Re/188 Os–187 Os/188 Os correlations observed in peridotite sulfides represent internal isochrons, with ages | | | Journal (volume) | alteration tends to obscure these features. In outcrop the contacts of the rhyolite generally appear to...DEPOSITS Asbestos Barite Borax Carbon dioxide Chromite Diatomite Magnesite Manganese Mineral paint Mineral...are associated with the igneous rocks. A little chromite and manganese ore has been produced, but the important...County, 1813-191^5 Mineral water Quicksilver Chromite Year Miscellaneous Miscellaneous and unapportioned... Mineral production of Lake County, 1878-1945 Chromite Mineral water Quicksilver Miscellaneous and | | | Report (issue) | ultramafic tectonite...... 17 Interlayered gabbro & peridotite.... 18 Gabbro.............................. 18................I...................... 14 7. An outcrop of polymict breccia in the Wadi Khadrah area. ...phyllonite and moderately deformed cumulus gabbro and peridotite...!....................... 20 9. Effects of deformation... FIGURE 11. Folded quartz veins on horizontal outcrop surfaces in the Wadi Khadra phyllonite......................................... 23 12. Outcrop of the Wadi Khadra phyllonite showing F3 folds........ | | | Journal (article/letter/editorial) | INSTITUT DES SCIENCES DE LA TERRE, UNIVERSITE J. FOURIER, GRENOBLE 1, 1381, RUE DE LA PISCINE, 38400 ST-MARTIN...ST-MARTIN D’HERES, FRANCE 2 MAX-PLANCK-INSTITUT FU«R CHEMIE, ABT. BIOGEOCHEMIE, POSTFACH 3060, 55020 MAINZ...their primary composition. KEY WORDS: mantle peridotite; melt transport; dunite channels; clinopyroxene;...of well-exposed and exceptionally fresh mantle peridotite; numerous, well-preserved outcrops of the crustal...melting processes, reactive melt transport and melt^peridotite interaction processes, and their role in the | | | Report (issue) | DIAMOND-BEARING PERIDOTITE IN ARKANSAS. By HUGH D. MISER. INTRODUCTION. Four areas of peridotite near Murfreesboro...1842. The rock, however, was not known to be peridotite until 1889, when Branner and Brackett 1 published...the Arkansas diamonds and the geology of the peridotite in this region, as indicated in the following...Little Rock, 1907, 16 pp. A unique collection of peridotite: Science, vol. 28, 1908, pp. 92-93. Sterrett...pp. 757-759. Purdue, A. H., A new discovery of peridotite in Arkansas: Econ. Geology, vol. 3, 1908, pp | | | Report (chapter) | Australia (Waterhouse 2015a, b). Elsewhere, a tiny outcrop of mainly felsic volcaniclastic sandstones (Topfer...data sources. (d) Ti/Zr v. La/Sc plot for the Darran Suite. (e) Ti/Zr v. La/Sc plot for the Drumduan Terrane...contact separates it from the Median Batholith. The outcrop is variable and discontinuous, and includes Cretaceous...non-exposed along-strike equivalent. The type outcrop of the Drumduan Terrane is north of the Alpine...represented by a structurally coherent, large outcrop (Largs Group). This is separated from the Brook | | | Report (issue) | enclose pyroxene grains. Only rarely does the peridotite contain enough clinopyroxThe penetrative-deformation...Lallemant, 1976). In the western massif, the ex- chromite grains. Dunite veins and dikes have textension...dike walls; this texture may reflect flow The peridotite of the ultramafic member is general- alignment...selected trace elements in ultramafic rocks (peridotite, harzburgite, pyroxenite) of the Canyon Mountain...Serpentinized Tectonite Tectonite Pyroxenite peridotite harzburgite harzburgite CM54 CM64 Pyroxenite | | | Report (issue) | glacial till dipping from surface towards 05 26 outcrop of asbestos lens in mica-gneiss bedrock. ........ from turn our prospecting attention to outcrop the drift areas, we covered Professor A....average analysis over a large area, including outcrop and overburden, but it is generally true that overburden...throughout the train, as are hard minerals such as chromite and magnetite. In the case of these latter three...deduced from the fact that scouring of the outcrop occurs on the side facing the glacier and deposition |
|