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| NW-SO streichenden Anomalien bestiitigen. Die Serpentinite stellen Teile eines zerscherten Ophiolithkomplexes...anomalies are related to relic magnetite and rare ilmenite phase concentrations in serpentinites and lower...isolated anomalies represents a polyphase deformed serpentinite emplacement overlain by coarse grained eclogitic...levels of the crust. Distribution of other basement outcrops is determined by late Tertiary to Recent extensional...characterized by abundant tectonically emplaced serpentinite bodies. 3.- a southern zone rich in metavolcanics |
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| aeromagnetic anomalies in southeast Cameroon, outcrops of talc, serpentinites, gabbro-amphibolites, and...area, suggest that this stage is widespread in the region (Fig. 2). Downloaded by [New York University]... 181. The serpentinite lenses are near horizontal as determined from individual outcrops and t h e wide...weak or absent aeromagnetic anomalies above some outcrops of mafic rocks, which have complex contours depending...serpentinites. Geochemical soil surveys o n serpentinite outcrops determining the distribution of Ni, Cr, |
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| Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of the Cobalt-Manganese...laterite and a lower in situ serpentinite-derived laterite. The serpentinite is massive with a nonpseudomorphic...genetically related phases: Serpentinite-I and Serpentinite-II. Serpentinite-I is characterized by antigorite...and magnesite, and Serpentinite-II by antigorite and magnesite. Both serpentinite types are extremely...extremely low in sulfides. Serpentinite-I is the dominant and oldest phase and was derived from a subcontinental |
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| REPORT 276 EVALUATION OF MINERALIZATION IN SERPENTINITE AND ENCLOSING ROCKS IN THE HAMDAH AREA, KINGDOM... Intrusive rocks .................. 5 5 8 SERPENTINITE ...................... 10 Description .......Hamdah serpentinite area ................... in pocket Sample location map of the Hamdah serpentinite area...goldpelt and the Hamdah serpentinite area ...... 3 Areal view of serpentinite containing numerous rounded...dike rock .................... 9 Areal view of serpentinite, carbonaceous schist, and mafic dike ...... |
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| Peninsula II Mount's Bay 1 4 III St. Agnes District IV Falmouth Bay V The Lizard Peninsula REFERENCES...Megiliggar Rocks 23 13. Map of the St. Agnes district 26 14. North-south cliff section through the...around Lizard Point 38 20. Vein of rodingite in serpentinite, Enys Head, Cadgwith 40 21. Map of the western...intrusion of Tregonning-Godolphin. Granite also outcrops at Cligga Head, St. Agnes Beacon and St. Michael's...this region in the past, but china clay is nowadays only exploited in the St. Austell district and at |
 | Luoni, Pietro, Rebay, Gisella, Roda, Manuel, Zanoni, Davide, Spalla, Maria Iole (2021) Tectono-metamorphic evolution of UHP Zermatt-Saas serpentinites: a tool for vertical palaeogeographic restoration. International Geology Review, 63 (10) 1236-1261 doi:10.1080/00206814.2020.1758967 | Journal (article/letter/editorial) |
| pietro.luoni@unimi.it KEYWORDS Ti-humites; serpentinite; subduction modelling; Piemonte Zone; Western...The red star locates the studied area (Créton outcrops) and the red rectangle Figure 1d; (c) cross-section...open folds with sub vertical axial planes. Créton outcrops have been the subject of high-precision structural...REVIEW 5 Figure 2. Form surface maps of two outcrops from Créton, showing a quite complete lithostratigraphy...layer underlying D2 tight folds in olivine-rich serpentinite; (c) magnetite layer intersected by S2 and D3 |
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| Peninsula II Mount’s Bay 15 III St. Agnes District 24 IV Falmouth Bay 29 V_ The Lizard Peninsula...intrusion of Tregonning-Godolphin. Granite also outcrops at Cligga Head, St. Agnes Beacon and St. Michael’s...China clay has been extensively exploited in this region in the past, but china clay is nowadays only exploited...and Symes (1987). The youngest deposits of the region are the small patches of Tertiary and Quaternary...hammering. ITINERARY III ST. AGNES DISTRICT The St. Agnes district (Figure 10) has been an important mining |
 | Zerboni, Andrea, Vignola, Pietro, Gatto, Maria Carmela, Risplendente, Andrea, Mori, Lucia (2017) Searching For the Garamantian Emerald: Reconsidering the Green-Colored Stone Beads Trade In the Ancient Sahara. The Canadian Mineralogist, 55 (4) 651-668 doi:10.3749/canmin.1600052 | Journal (article/letter/editorial) |
| green-colored stone beads from Fewet consist of serpentinite and amazonite. The K/Rb versus Rb diagram reveals...text. The position of Eghei Zuma in the Dohone region (northern fringe of the Tibesti batholith) is also...Garamantian culture expanded within the Libyan region of Fezzan to form a proper kingdom. At that time...Acacus massif, along wadi Howar, and in the Borku region (Gatto 2005, Biagetti & di Lernia 2008, Jesse 2013)...stones. No amazonite beads have been found in the region in archaeological contexts prior to the Garamantian |
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| Magmatism in Serpentinized Peridotites from the 15°N Region. Mathilde Cannat and lohn F Casey 5 Gabbroie...Ridges: Implications for Melt Generation and Mantle Outcrops Chan tal Tisseau and Thierry Tonnerre 181 Introduction...Magmatism in Serpentinized Peridotites from the 15°N Region. MATHILDE CANNAT AND lOHN F. CASEY* URA 736, Laboratoire...melt segregation to produce evolved magmas in this region of the Atlantic are also discussed. Introduction...Nautile cruise in the Capo Verde Fracture zone region (IsoN; Fig. 1) of the Mid-Atlantic Ridge (Bougault |
 | Hattori, Kéiko H., Guillot, Stéphane, Saumur, Benoit-Michel, Tubrett, Mike N., Vidal, Olivier, Morfin, Samuel (2010) Corundum-bearing garnet peridotite from northern Dominican Republic: A metamorphic product of an arc cumulate in the Caribbean subduction zone. Lithos, 114 (3) 437-450 doi:10.1016/j.lithos.2009.10.010 | Journal (article/letter/editorial) |
| The garnet periodotite was then exhumed in the serpentinite subduction channel. These events likely took...(Fig. 1a). Until the Mid to Late Cretaceous, this region was above the NE-dipping Farallon oceanic plate...of amphibole + quartz + plagioclase ± rutile ± ilmenite ± chlorite ± epidote, and has undergone retrogression...4 m in size) occur together with boulders of serpentinite (up to 2 m) and eclogites along the narrow (b6...bordered by hills with dense vegetation. Although outcrops of garnet peridotite were not found due to thick |
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| bucher@uni-freiburg.de) ABSTRACT The Zermatt-Saas serpentinite complex is an integral member of the Penninic...lithosphere of the Tethys. Metamorphic textures of the serpentinite preserve the complex mineralogical evolution...km depth. Key words: antigorite; ophiolite; serpentinite; textures; Zermatt-Saas. INTRODUCTION Eclogite...composition and field appearance, and the exposed serpentinite area in the Swiss part of the complex is on...ultramafic rocks during subduction. A compilation of serpentinite textures is presented, which can be linked to |
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| the roof of the upper mantle); (iii) widespread outcrops of abyssal gabbros and serpenof the mantle origin...connection, the World Rift System is pictured as a region of the Earth in which the deep-seated evolutionary...interrelationship of such the new formation of the oceanic region. geological phenomena as the development of mid-oceanic...geological evolution of the Bay of Bengal platform region, which is an oceanic platform, is sedimen tation...surface and in close relationship to ultrabasic rock outcrops associated with the upper mantle matter. This |
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| quartz, and rutile, among others. Serpentinite Serpentinite outcrops in bands and pods along the length...Harmotome Hematite Heulandite-Ca Hydromagnesite Ilmenite Kalinite Kaolinite Kyanite Laumontite Lizardite...SM1137. Figure 40 (upper right). Platy metallic ilmenite, variety washingtonite, from 56th Street at Broadway |
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| Number Five Articles The Val Graveglia m anganese district, Liguria, I t a ly .............................RHODOCHROSITE crystals to 1.6 cm, from the Uchucchacua district, Huanuco depart ment, Peru. (See vol. 28, no...and occasionally fine minerals. The manganese district of Val Graveglia in northern Italy produced over...beauty or rarity. LOCATION The northern coastal region of the Tyrrenian Sea is called Liguria: the name...time the region has had a complex history. Genoa is the main city and the main harbor of the region; the |
 | Berger, Julien, Caby, Renaud, Liégeois, Jean-Paul, Mercier, Jean-Claude C., Demaiffe, Daniel (2011) Deep inside a neoproterozoic intra-oceanic arc: growth, differentiation and exhumation of the Amalaoulaou complex (Gourma, Mali) Contributions to Mineralogy and Petrology, 162 (4) 773-796 doi:10.1007/s00410-011-0624-5 | Journal (article/letter/editorial) |
| showing the position of the main Pan-African outcrops with emphasis on continental and oceanic arcs...are presented in the Electronic Appendix A2. Serpentinite unit Fig. 3 a Geological map of the Amalaoulaou...fabrics are preserved in some boudins of massive serpentinite, defined by elongated sigmoidal porphyroclasts...conditions. At the contact with the underlying serpentinite unit, the epidote amphibolites are transformed...quartz with minor apatite, chloritised biotite, ilmenite and accessory zircon (Table 1). The gabbros show |
 | Shagam, R., Hargraves, R. B., Morgan, W. J., Houten, F. B. Van, Burk, C. A., Holland, H. D., Hollister, L. C. - Eds. (1972) Studies in Earth and Space Sciences. GSA Memoir 132. Geological Society of America doi:10.1130/mem132 | Report (issue) |
| Mechanisms for the Emplacement of AlpineType Serpentinite .John P. Lockwood 273 A Primary Peridotite...through his career, from his thesis study on serpentinite at Schuyler, Vir¬ ginia, to his last field trip...geology and geologists of southern Africa. That region constituted one of the few outposts of vehement...band 75 miles wide but that in the surrounding region it is uniformly thick. This was baffling and remains...model comes from the Juan de Fuca Ridge region. We claim this region has two minor hot spots creating the |
 | Estrada-Carmona, Juliana, Weber, Bodo, Scherer, Erik E., Martens, Uwe, Elías-Herrera, Mariano (2016) Lu-Hf geochronology of Mississippian high-pressure metamorphism in the Acatlán Complex, southern México. Gondwana Research, 34. 174-186 doi:10.1016/j.gr.2015.02.016 | Journal (article/letter/editorial) |
| Formation is composed of amphibolite, metagabbro, serpentinite, eclogite, pelitic schist, and quartzite (Ortega-Gutiérrez...after omphacite. Titanite, and titanite after Ilmenite suggest that decompression occurred. Please cite...epidote 3II9B 1. Euhedral Eclogite garnet rutile ilmenite hornblende Eclogite Grt2 Grt1 ? ? Amphibolite...Tehuitzingo area, which includes abundant serpentinite outcrops, shares a common metamorphic history with |
 | Barnes, Jaime D., Beltrando, Marco, Lee, Cin-Ty A., Cisneros, Miguel, Loewy, Staci, Chin, Emily (2014) Geochemistry of Alpine serpentinites from rifting to subduction: A view across paleogeographic domains and metamorphic grade. Chemical Geology, 389. 29-47 doi:10.1016/j.chemgeo.2014.09.012 | Journal (article/letter/editorial) |
| mobility of Pb, Ba, Cs, U, Rb during subduction •Serpentinite-crustal contact is analogous to the slab-mantle...Canavese unit and Punta Rossa Unit). Bulk rock serpentinite samples have high REE RI concentrations, compared...distance to the interface between the sediment and serpentinite. The chemical gradient between the ultramafic...values increase, 37Cl values decrease within the serpentinite with decreasing distance to the contact and...geochemical gradients within the Punta Rossa serpentinite indicates a limited role for externally derived |
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| Triassic Gall bro (sea floor) Peridolite, serpentinite - - - - - - - - - - - - - - - - - - - - - -...light-colored airfall ash to blanket much of the region. That was an impressive episode of volcanic activity...rest on basalt lava flows which in turn rest on serpentinite, a green rock that forms when the heavy black...seafloor there is a zone of serpentinite some thousands of feet thick. Serpentinite is a strange, greasy-looking...light-colored rock is ground up to make talcum powder. Serpentinite forms when the heavy, black rocks of the earth's |
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| 1993 Dr Aspden covered the El Oro metamorphic district whilst Dr R A Je1nielita (Economic Geologist)...coastal foothills range of the El Oro meta morphic district, lhe other, smaller project study area (Figure...perate with grassland vegetation and rainfall in the region of 700 mm per year (see rainfall for Quito and...tropical. Rainfall is high over this eastern slope region due to rising hot air masses fro1n the Oriente;...relatively dense over the El Oro metan1or phic district, with towns such as Portovelo and Pinas in the |
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| Morocco. T,vo sections through the Dutch coal mining district Cairo-Suez gravity section . . . . . . . Sketch.... . . . . . . . . Sketch map Bou Azzer mining district, Anti-Atlas Three sections through ophiolitic...km north of the outcropping Pre-Cambrian. The outcrops in the instructive Hoggar section (up to rooo...late sixties to southern Libya, where excellent outcrops of the Pre-Cambrian are known in the Tibesti area...also the results of geophysical work on basement outcrops. Nevertheless, the Pre-Cambrian stratigraphy has |
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| ................. 39 Central and northwestern region .................................................resources 53 Geological map of the Agnew - Mount Keith region .................................................Generalized tentative stratigraphy of the Forrestania region .................................................nickelfrom mines developed in the Eastern Goldfielh region since 1966. Annual state mine production since...smelter was built at the capital Noumea in 1877. The district that became the world’s principal single source |
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| the setting and origin of major deposits in the region, together with information on tonnages and grades...tungsten-gold and lead-zinc-silver deposits of the Tighza district of Morocco, proposing links to granite-related...polymetallic vein deposits of the Edough-Cap de Fer district of Algeria, including fluid inclusion data that...porphyry–epithermal transition recorded in the Ouixane iron district of Morocco, using new geochronological and fluid...(±gold ±silver) deposits of the famous Bou Azzer district in Morocco, and proposes a long-lived, magmatic-hydrothermal |
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| open your eyes to the largest and most unexplored region on Earth – the global Mid-Ocean Ridge. My own introduction...produced, was that there appeared to be a shallow region in the middle of the North Atlantic basin that...bathymetric map of the Mid-Atlantic Ridge in the 20–24° N region showing the prominent rift valley, rough topography...20’W and are part of the seamount province in this region. 1.3 DEVELOPMENTS IN OPTICAL IMAGING TECHNOLOGY...he co-designed, transported him to the deepest region of the global ocean, the Mariana Trench, to sample |
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| intrigue exploration geologists who work in that region. Among recent explorations is that of D. D. Brown...principally, with lesser quantities of magnesian ilmenite and one sample of chrome-diopside. Brown, Bennett...in several areas of this state. In the Helena district, activity centers mainly on the gravel beds of...this deposit, like that found elsewhere in the district and in other pegmatite deposits of the world,...a very large and long granitic pegmatite which outcrops to form a prominent ridge along the southern edge |
