Search Results

1 - 10 of 18 items :

  • "serpentine" x
  • Geosciences, other x
Clear All
Composition and alteration of Cr-spinels from Milia and Pefki serpentinized mantle peridotites (Pindos Ophiolite Complex, Greece)

characteristics within podiform chromitite from Rayat, northeastern Iraq. Mineral. Mag. 70, 5, 499-508. Arif M. & Jan M.Q. 2006: Petrotectonic significance of the chemistry of chromite in the ultramafic-mafic complexes of Pakistan. J. Asian Earth Sci. 27, 628-646. Bach W., Paulick H., Garrido C.J., Ildefonse B., Meurer W. & Humphris S.E. 2006: Unravelling the sequence of serpentinization reactions: petrography, mineral chemistry, and petrophysics of serpentinites from MAR 15 °N (ODP Leg 209, Site 1274). Geophys. Res. Lett. 25, 1467

Open access
Perovskite, reaction product of a harzburgite with Jurassic– Cretaceous accretionary wedge fluids (Western Carpathians, Slovakia): evidence from the whole-rock and mineral trace element data

Alps and Western Carpathians. Palaeogeogr. Palaeoclimatol. Palaeoecol. 87, 109-135. Leško B. & Varga I. 1980: Alpine elements in the West Carpathian structure and their significance. Miner. Slovaca 12, 97-130. Li X.H., Putiš M., Yang Y.H., Koppa M. & Dyda M. 2014: Accretionary wedge harzburgite serpentinization and rodingitization constrained by perovskite U/Pb SIMS age, trace elements and Sm/Nd isotopes: Case study from the Western Carpathians, Slovakia. Lithos 205, 1-14. Malvoisin B., Chopin Ch., Brunet F

Open access
Petrology and geochemistry of a peridotite body in Central- Carpathian Paleogene sediments (Sedlice, eastern Slovakia)

: two new IAG-certified ultramafic rock reference materials. Geochim. Cosmochim. Acta 74, Suppl 1, A129. Cambel B. 1951: Ultrabasic rock from Sedlice and serpentines of the closest surrounding. [Ultrabázická hornina od Sedlíc a hadce najbližšieho okolia.] Geol. Zbor. Slovak. Akad. Vied 2, 1-91 (in Slovak). Choi S.H., Shervais J.W. & Mukasa S.B. 2008: Supra-subduction and abyssal mantle peridotites of the Coast Range ophiolite, California. Contr. Mineral. Petrology 156, 551-576. Dallmeyer R.D., Neubauer F., Handler R

Open access
The Role of Habitat Types and Soil Physicochemical Properties in the Spread of a Non Native Shrub Lantana Camara in the Doon Valley, Western Himalaya, India

management status and future prospects. ACIAR Monograph 102, 1-125. Drenovsky, R.E., Batten, K.M. 2007. Invasion by Aegilops triuncialis (barb goat grass) slows carbon and nutrient cycling in serpentine grassland. Biological Invasion 9, 107-116. DOI: 10.1007/s10530-006-0007-4 Duda, J.J., Freeman, D.C., Emlen, J.M., Belnap, J., Kitchen, S.G., Zak, J.C., Sobek, E., Tracy, M., Montante, J. 2003. Differences in native soil ecology associated with invasion of the exotic annual chenopod, Halogeton glomeratus. Biology and Fertility of Soils 38, 72

Open access
Stable isotope geochemistry of sulfides from intrusion in Monchegorsk, northern part of Baltic Shield

). Within these rocks they are associated massive sulfide ore deposits, mainly composed of pyrite and pentlandite, chalcopyrite and breccias containing all the above men-tioned types of rocks. These breccias are composed of crushed rocks of peridotites which are cemented by quartz and sulfides. The microscopic observation indi-cates sulfides such as pyrite, chalcopyrite and secondary altered gabbroids by serpentinization and saussuritization processes ( Fig. 3A , 3B ). Fig. 3 Microphotographs of samples of massive sulfide mineralization from Monchegorsk (sample 2

Open access
U-Pb geochronology, Sr-Nd geochemistry, petrogenesis and tectonic setting of Gandab volcanic rocks, northeastern Iran

a porphyritic texture with microlitic groundmass. Plagioclase (25–30 vol. %), olivine (15–20 vol. %), clinopyroxene (10–15 vol. %), opacity hornblende (8–10 vol. %), and magnetite (5–7 vol. %) are the dominant phenocryst phases. Phenocryts occurs as large euhedral crystals, and plagioclases mostly display polysynthetic twins and some of them show slight oscillatory zoning. As well, some clinopyroxens show augite twins ( Fig. 3a ). Furthermore, Olivine grains are replaced by iddingsite and serpentine; opacity hornblendes are replaced by chlorite. Fig. 3

Open access
Tectonic evolution of the southeastern part of the Pohorje Mountains (Eastern Alps, Slovenia)

Tectonic evolution of the southeastern part of the Pohorje Mountains (Eastern Alps, Slovenia)

Field relations and deformation structures in the southeastern part of the Pohorje Mountains constrain the tectonic evolution of the Austroalpine high-pressure/ultrahigh pressure (HP/UHP) terrane. The Slovenska Bistrica Ultramafic Complex (SBUC) forms a large (ca. 8 × 1 km size) body of serpentinized harzburgite and dunite including minor garnet peridotite and is associated with partly amphibolitized eclogite bodies. The SBUC occurs in the core of an isoclinal, recumbent, northward closing antiform and is mantled by metasedimentary rocks, mostly gneisses and a few marbles, including isolated eclogite/amphibolite lenses. Before this folding, the SBUC formed the deepest part of the exposed terrane. We interpret the SBUC to be derived from near-MOHO, uppermost mantle which was intruded by gabbros in the subsurface of a Permian rift zone. During Cretaceous intracontinental subduction, the SBUC was most likely part of the footwall plate which experienced HP to UHP metamorphism and was folded during exhumation. In the Miocene, the Pohorje Pluton intruded and, subsequently, the metamorphic rocks together with the pluton were deformed probably due to east-west extension and contemporaneous north-south shortening, thus forming an antiformal metamorphic core complex.

Open access
Geochemistry and origin of plagiogranites from the Eldivan Ophiolite, Çankırı (Central Anatolia, Turkey)

, 161-174 Bailey E.B. & McCallien C. 1953: Serpentine lavas, the Ankara Melange and the Anatolian Thrust, Trans. Roy. Soc., Edinburgh 62, 403-442. Beard J.S. & Lofgren G.E. 1991: Dehydration melting and watersaturated melting of basaltic and andesitic greenstones and amphibolites at 1, 3 and 6.9 kb. J. Petrology 32, 365-401. Bragin N.Y. & Tekin U.K. 1996: Age of radiolarian-chert blocks from the Senonian Ophiolitic Melange (Ankara, Turkey). The Island Arc 5, 114-122. Cocherie A. 1978: Geochimie des

Open access
Clay mineralogy of the Paleozoic-Lower Mesozoic sedimentary sequence from the northern part of the Arabian Platform, Hazro (Diyarbakır, Southeast Anatolia)

. 1993: Use of glauconites for stratigraphic correlation: a review and case studies. Giornale di Geologia 55, 117-137. Amorosi A. 1995: Glaucony and sequence stratigraphy: a conceptual framework of distribution in siliciclastic sequences. J. Sed. Res. B65, 419-425. Bailey S. W. 1988: X-ray diffraction identification of the polytypes of mica, serpentine, and chlorite. Clays Clay Miner. 36, 193-213. Biscaye P. E. 1965: Mineralogy and sedimentation of recent deepsea clay in the Atlantic

Open access
Ophiolitic detritus in Kimmeridgian resedimented limestones and its provenance from an eroded obducted ophiolitic nappe stack south of the Northern Calcareous Alps (Austria)

., Frei D., Báldi-Béke M., Reitner J., Wemmer K., Hrvatović H. & von Eynatten H. 2008: Provenance of the Bosnian Flysch. Swiss J. Geosci. 101, 1, 31–54. Mikuš T. & Spišiak J. 2007: Chemical composition and alteration of Cr-spinels from Meliata and Penninic serpentinized peridotites (Western Carpathians and Eastern Alps). Geol. Quart. 51, 257–270. Missoni S. & Gawlick H.-J. 2010: Neudefinition der Saalachzone in den Nördlichen Kalkalpen (Österreich, Deutschland): was ist sie, woher kommt sie und woraus besteht sie? J. Alp. Geol. 52, 182

Open access