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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 ...... |
 | Swayze, Gregg A., Higgins, Chris T., Clinkenbeard, John P., Kokaly, Raymond F., Clark, Roger N., Meeker, Gregory P., Sutley, Stephen J. (2004) Preliminary report on using imaging spectroscopy to map ultramafic rocks, serpentinites, and tremolite-actinolite-bearing rocks in California. Open-File Report 2004-1304. US Geological Survey doi:10.3133/ofr20041304 | Report (issue) |
| in El Dorado and Plumas Counties that contain serpentinite and ultramafic rocks as part of an experiment...Serpentine has been detected outside of known serpentinite outcrop areas, mostly as aggregate that covers...predominantly, but not exclusively, found in serpentinite and ultramafic rocks, which are common in the...were collected in August 2001 over exposures of serpentinite and ultramafic rocks that were mapped during...Hill line (#14) was flown N-S and includes serpentinite outcrops along the exposed low-water shoreline of |
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| Glenelg, Ross shire and in the Innellan and .Toward district of Argyllshire, some of which have been worked...United Kingdom is almost entirely confined to serpentinite bodies which have undergone hydrothermal alteration...Unst and the Main land of Shetland. The Unst serpentinite stretches across the eastern part of the island...Fig. 2 page 8.). The western portion of the serpentinite consists largely of antigorite but along its...also along the western edge of the Clibberswick serpentinite further east, from Cross Geo in the south, northwards |
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| of cross- or slip-fiber veins within massive serpentinite bodies, no such veins are to be found in the...chrysotile surrounding blocks and fragments of serpentinite rock. The highly sheared and pulverized nature...distinguishable : (I) hard, dense blocks of serpentinite rock, ranging from fractions of an inch to several...the above materials, with the exception of the serpentinite rock which consists mainly of lizardite and/or...like cel1ulose fibers in paper. Fragments of serpentinite gangue are scattered throughout the ore and |
 | Oostindiër, Jaap, Vriend, Simon P., Huijsmans, Joep P.P., Taufen, Paul M. (1990) Weathered, Ni-sulfide ore-hosting and barren serpentinites in the Fortaleza de Minas greenstone belt, Minas Gerais, Brazil: A rock geochemical study. Chemical Geology, 81 (3) 209-220 doi:10.1016/0009-2541(90)90116-o | Journal (article/letter/editorial) |
| chemical composition of the serpentinite surface rocks. To relate weathered serpentinite composition to the original...d u c t i o n Recent exploration in the Furnas region of the Archean granitoid greenstone terrain, Minas...serpentinites similar to the O'Toole orehosting serpentinite occur in the Fortaleza de Minas greenstone belt...belt. Rock geochemical sampling of serpentinite outcrops was carried out to determine if the presence...reflected in the chemistry and mineralogy of its serpentinite host rock. This 210 information can be used |
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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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| the known factual data on the geology of this region of Africa could not explain the anom alies, because...is evidently associated with the fact that the outcrops of iron quartzite, distributed over a large area...hundreds of kilometers to the northwest of this region in the Central African Republic (CAR) in the vicinity...2016 INTERNATIONAL GEOLOGY REVIEW Geology of the Region of the Anomaly in other regions of the globe major...magnetization of the lithosphere are replaced by an arcuate region with an overall low magnetization, which coincides |
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| ........................................ 17 Serpentinite ........................................................................ 17 WEATHERING OF SERPENTINITE AND TALC .....................................and enstatite versus height above base of the serpentinite .................................... 14 Multilithic............. 23 Photomicrograph of silicified serpentinite ................................................... 24 SiO2 and MgO, Fe2o3 and FeO versus serpentinite alteration ................................ |
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| million years. Amphibolites (Las Pirquitas/Quemado region) with N-MORB like light-depleted REE patterns and...Valdivia/Barboza) formed as arc cumulates, and (central region) as ridge or arc/back-arc lavas (including shoshonite)...silicic schists/gneisses are interpreted as arc region greywackes and silicic lavas, and marbles as reef...in the southwestern Pacific Ocean. The Lau Basin region is used for comparison. The field, petrological...the western Sierras Pampeanas and Precordillera region over the modern shallow subduction zone in the |
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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, |
 | Boskabadi, Arman, Pitcairn, Iain K., Broman, Curt, Boyce, Adrian, Teagle, Damon A. H., Cooper, Matthew J., Azer, Mokhles K., Stern, Robert J., Mohamed, Fathy H., Majka, Jaroslaw (2017) Carbonate alteration of ophiolitic rocks in the Arabian–Nubian Shield of Egypt: sources and compositions of the carbonating fluid and implications for the formation of Au deposits. International Geology Review, 59 (4) 391-419 doi:10.1080/00206814.2016.1227281 | Journal (article/letter/editorial) |
| Francis Group KEYWORDS Arabian–Nubian Shield; serpentinite; listvenite; carbonation; gold; fluid-mobile...roadside exposures of serpentinite SW of the Meatiq Dome (Figure 2). The serpentinite outcrops are brownish grey...dome shows a complex exposure of greenish grey serpentinite and shear zone hosted talc-rich rocks (Figures...contacts between the talc-rich rocks and the serpentinite range from gradational to sharp (Figure 3(d))...synthetic silicates and oxides. The compositions of chromite are recalculated to cation proportions using the |
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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 |
 | Boschi, C., Dini, A., Dallai, L., Ruggieri, G., Gianelli, G. (2009) Enhanced CO2-mineral sequestration by cyclic hydraulic fracturing and Si-rich fluid infiltration into serpentinites at Malentrata (Tuscany, Italy) Chemical Geology, 265 (1) 209-226 doi:10.1016/j.chemgeo.2009.03.016 | Journal (article/letter/editorial) |
| Malentrata (Tuscany, Italy) were derived from serpentinite silicification– carbonation of the Ligurian ophiolite...of the protolith. The pervasive alteration of serpentinite was accompanied by the formation of a network...discontinuities. This two-steps reaction (dissolution of serpentinite followed by carbonate precipitation outside...widespread silicate rocks (i.e., peridotite, serpentinite, basalt) that trap safely CO2 over geological...analogue of CO2 mineralogical sequestration, a serpentinite- Fig. 1. Geological map of southern Tuscany |
 | Cooperdock, Emily H.G., Raia, Natalie H., Barnes, Jaime D., Stockli, Daniel F., Schwarzenbach, Esther M. (2018) Tectonic origin of serpentinites on Syros, Greece: Geochemical signatures of abyssal origin preserved in a HP/LT subduction complex. Lithos, 296. 352-364 doi:10.1016/j.lithos.2017.10.020 | Journal (article/letter/editorial) |
| October 2017 Available online xxxx Keywords: Serpentinite Syros Cycladic Blueschist unit Trace element...and magnetite. δD and δ18O values of bulk rock serpentinite powders and chips (δD = −64 to −33‰ and δ18O...peridotite. However, recent compilations of global serpentinite data demonstrate that whole rock major and trace...with serpentinites in multiple meta-ophiolitic outcrops (Katzir et al., 2007; Keiter et al., 2011; Ridley...element, and stable isotope geochemistry from serpentinite samples that cover all major occurrences on |
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| ABSTRACT: Narrow, intermittent, fault-bounded outcrops forming the largely Ordovician Highland Border...that two main groups exist. One, represented in outcrops the length of the Highland Boundary fault-zone...black shales, arenites and conglomerates. The outcrops are fragmented and poorly exposed, and it is perhaps...Border' covers a much wider area in which there are outcrops of both the Dalradian Supergroup and sediments...rocks mainly of greenschist facies (Table 1). Outcrops are narrow, discontinuous and strongly faulted |
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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 |
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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 |
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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...long. Coarsepolygonal olivine with interstitial chromite and sulphidesforms the olivinite, but Layered |
 | Dias, Á.S., Mills, R.A., Ribeiro da Costa, I., Costa, R., Taylor, R.N., Cooper, M.J., Barriga, F.J.A.S. (2010) Tracing fluid–rock reaction and hydrothermal circulation at the Saldanha hydrothermal field. Chemical Geology, 273 (3) 168-179 doi:10.1016/j.chemgeo.2010.02.020 | Journal (article/letter/editorial) |
| the water column, and the occurrence of serpentinite outcrops in the vent area. We have studied the geochemistry...thus enhances hydrothermal alteration within a region of low-temperature diffuse flow. © 2010 Elsevier...Hydrothermal activity associated with ultramafic outcrops at midocean ridges (MOR) is a relatively recent...and ultraslow spreading ridges and the ultramafic outcrops are usually associated with detachment faulting...Metabasalt Metabasalt Metagabbro Metagabbro Serpentinite Serpentinite Steatite Steatite 2223 2421 2217 2232 |
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| area of Fig. 2 is marked in outline. areas of serpentinite are exposed, with isolated blocks of peridotites...material that had been entrained within the rising serpentinite diapir (Bear & Morel 1960; Panayiotou 1977;...(1986a,b; Murton & Gass 1986), who documented E-W serpentinite shear zones and mylonites (described herein)...the western LFC serpentinite outcrop. He also showed that the serpentinite outcrops, supposedly diapiric...western LFC and Akapnou Forest Mantle Sequence outcrops are shown in Fig. 4. Substantial brittle deformation |
 | 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...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...have been lost during the erosion. The lack of outcrops makes it difficult to assess the validity of these |
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| . 50 Foothills Fault Zone and the Mother Lode District.................. 51 Conclusions................the average compositions of primary spinel in serpentinite samples from the Nabitah fault zone...........initial formation as normal faults in the fore-arc region of such an arc system. Based on the presence of...and analogous tectonic setting, the Mother Lode District in California is reviewed as a model for gold...Identified by a locus of northtrending, fault-bounded serpentinite bodies, the Nabitah fault system can be traced |
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| quartz, and rutile, among others. Serpentinite Serpentinite outcrops in bands and pods along the length...brucite, and talc with disseminated grains of chromite and magnetite. When the serpentine decomposes...Calcite Chabazite-Ca Chabazite-K Chalcopyrite Chromite Chrysoberyl Chondrodite Clinochlore Clinochrysotile |
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| the Jurassic Tethyan Ocean in the Mediterranean region (e.g. Jones & Robertson 1990), the Cretaceous Tethys...this lineament (Hyden 1979; Cawood 1986, 1987). Outcrops to the north of the Alpine Fault have been mapped...incomplete, pseudostratigraphy in a few classic outcrops, notably Red Mountain (e.g. Sinton 1980), whereas...sheared serpentinite) in which the ophiolite stratigraphy is highly disrupted (e.g. serpentinite melange)...melange) are placed within the Patuki Melange. Some outcrops of highly sheared and disrupted ophiolitic rocks |
 | 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 |
