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Journal articles on the topic 'Hercynién s.I'

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Published: 4 June 2021

Last updated: 6 February 2022

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1

Kohút, Milan, Pavel Uher, Marián Putiš, et al. "SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carpathians): evidence of Meso-Hercynian successive S- to I-type granitic magmatism." Geologica Carpathica 60, no. 5 (2009): 345–50. http://dx.doi.org/10.2478/v10096-009-0026-z.

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SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carpathians): evidence of Meso-Hercynian successive S- to I-type granitic magmatismRepresentative granitic rock samples from the Malé Karpaty Mountains of the Western Carpathians (Slovakia) were dated by the SHRIMP U-Th-Pb isotope method on zircons. Oscillatory zoned zircons revealed concordant Mississippian magmatic ages: 355±5 Ma in Bratislava granodiorite, and 347±4 Ma in Modra tonalite. The results document nearly synchronous, successive Meso-Hercynian plutonic events from S-type to I-type granites

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2

Dezayes, Chrystel, and Catherine Lerouge. "Reconstructing Paleofluid Circulation at the Hercynian Basement/Mesozoic Sedimentary Cover Interface in the Upper Rhine Graben." Geofluids 2019 (March 6, 2019): 1–30. http://dx.doi.org/10.1155/2019/4849860.

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In this paper, we focus on paleocirculation at the Hercynian basement/sedimentary cover interface in the tectonic environment of the Upper Rhine graben. The goal is to increase our understanding of the behavior of the fracture-fault network and the origin of the hydrothermal fluids. We studied orientations, mineral fillings, and fluid origins of fractures that crosscut the Hercynian granitic basement and the Permo-Triassic formations in relation to the major tectonic events. Because the Mesozoic formations and the Hercynian basement on the graben flanks and inside the graben do not have the sa

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3

Pamić, Jakob, Marvin Lanphere, and Mirko Belak. "Hercynian I-type and S-type granitoids from the Slavonian mountains (southern Pannonian Basin, northern Croatia)." Neues Jahrbuch für Mineralogie - Abhandlungen 171, no. 2 (1996): 155–86. http://dx.doi.org/10.1127/njma/171/1996/155.

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4

SCHMULL, Michaela, and Markus HAUCK. "Lecidea hercynica, a new montane epiphytic lichen from Germany." Lichenologist 37, no. 6 (2005): 485–89. http://dx.doi.org/10.1017/s0024282905015422.

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Lecidea hercynica Hauck & Schmull is described as a new species from Germany. It is characterized by a poorly developed or bullate to verrucose, areolate thallus on whitened spots of the substratum, numerous plane to yellowish brown to black, convex apothecia with a persistent margin, Micarea type-like asci, and by the presence of atranorin and protocetraric acid. It does not belong to Lecidea s. str., but is provisionally placed in Lecidea s. lat. until a taxonomic treatment of the whole group has been carried out. Lecidea hercynica is widespread in high-elevation forests of Picea abies i

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5

Nawrocki, Jerzy, Magdalena Pańczyk, and Piotr Szrek. "Magmatic activity at the Silurian/Devonian boundary in the Brunovistulia and Małopolska Terranes (S Poland): possible link with the Rheic Ocean closure and the onset of the Rheno-Hercynian Basin." Geological Magazine 157, no. 2 (2019): 119–33. http://dx.doi.org/10.1017/s0016756819000384.

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AbstractThe age of granophyric diorite from the Sosnowiec IG-1 borehole (Brunovistulia Terrane) was studied by means of U–Pb single-grain zircon analysis performed on a SHRIMP (sensitive high-resolution ion microprobe) IIe device. The isotope ages and provenance of zircons from the Emsian tuffs cropping out in the southern part of the Holy Cross Mountains (Małopolska Terrane) were also investigated using the same method. The age of the diorite intrusion (420 ± 2 Ma) is comparable with the combined Ar–Ar/magnetostratigraphic age of the Bardo diabase intrusion from the northern part of the Małop

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Strzerzynski, Pierre, Louise Lenoir, Paul Bessin, and Loic Bouat. "Brittle tectonics and fluids overpressure during the early stage of the Bay of Biscay opening in the Jard-sur-Mer area, (northern Aquitaine Basin, France)." BSGF - Earth Sciences Bulletin 191 (2020): 38. http://dx.doi.org/10.1051/bsgf/2020025.

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Ba, F, Pb, Ag, Zn mineral deposits are widespread at the northern and eastern boundaries of the Aquitaine Basin. In most cases, they are hosted within high permeability carbonates that rest over the Hercynian basement and below an impermeable layer. Such a position suggests a Mississippi Valley Type (MVT) model for the formation of these deposits. This model is characterized by the lateral flow of sedimentary fluids expelled from the deeper part of the basin and mixed with other sources of water as they reach the basin boundaries. In the Jard-sur-Mer area, which sits in the north of the Basin,

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7

Boiron, M. C., M. Cathelineau, J. Dubessy, and A. M. Bastoul. "Fluids in Hercynian Au veins from the French Variscan belt." Mineralogical Magazine 54, no. 375 (1990): 231–43. http://dx.doi.org/10.1180/minmag.1990.054.375.09.

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AbstractFluids, together with alteration and ore mineral assemblages, were studied in representative hydrothermal gold-bearing quartz veins from the western part of the Variscan belt in France (La Bellière, Montagne Noire district, Villeranges-Le Châtelet district, and Limousin province). Petrographic studies of the relationships between ores, fluid inclusions, microfracturing and quartz textures show that chronological and genetic relationships between gold deposition and fluid trapping may be very complex and difficult to establish for veins which show multi-stage fracturing and shearing. Sy

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8

Stone, Maurice. "The Significance of Almandine Garnets in the Lundy and Dartmoor Granites." Mineralogical Magazine 52, no. 368 (1988): 651–58. http://dx.doi.org/10.1180/minmag.1988.052.368.09.

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AbstractAlmandine garnets in the cordierite-bearing granite of Sweltor Quarry, Dartmoor, contain < 10 mol. % of the spessartine end-member, whilst those in the Lundy granite have c. 10 mol. % spessartine. Experimental work indicates that such compositions can grow in equilibrium with siliceous melts at depths of 18–25 km. This evidence, reaction rims, lack of marked zoning and comparison with garnets in other siliceous calc-alkaline siliceous rocks point to a genesis involving partial melting of the ‘local’ lower crust. A restite origin rather than direct crystallization from magma is favou

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Evans, Neil G., Ge´rard Gleizes, Denis Leblanc, and Jean-Luc Bouchez. "Hercynian tectonics in the Pyrenees: a new view based on structural observations around the Bassie`s granite pluton." Journal of Structural Geology 19, no. 2 (1997): 195–208. http://dx.doi.org/10.1016/s0191-8141(96)00080-6.

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10

Stone, Maurice. "The Lundy granite: a geochemical and petrogenetic comparison with Hercynian and Tertiary granites." Mineralogical Magazine 54, no. 376 (1990): 431–46. http://dx.doi.org/10.1180/minmag.1990.054.376.09.

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AbstractNew chemical data show that the two main granite types (G1 and G2) cannot be discriminated, but that microgranite sheets/dykes (G3) are significantly different and more evolved, largely as a result of biotite, accessory mineral, and plagioclase fractionation. The Lundy granite is similar to other Tertiary granites of Scotland and Ireland, in age, setting, possible high-temperature mineralogy, relationship to basic magmatism, and REE patterns. These features and a highly evolved chemistry suggest derivation from an unexposed more ‘primitive’ granite that, in turn, had a basaltic parenta

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Gomes, M. E. P., and A. M. R. Neiva. "Chemical zoning of muscovite from the Ervedosa granite, northern Portugal." Mineralogical Magazine 64, no. 2 (2000): 347–58. http://dx.doi.org/10.1180/002646100549247.

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AbstractThe tin-bearing muscovite granite from Ervedosa contains unzoned primary muscovite. This Hercynian S-type granite was hydrothermally altered at the stanniferous quartz vein walls and contains three types of muscovite: (1) very small unzoned muscovite replacing albite; (2) small unzoned hydrothermal muscovite replacing K-feldspar and quartz; and (3) zoned subhedral muscovite.In the zoned muscovite, the core has a composition similar to that of magmatic muscovite from the unaltered granite, while the rim has a composition similar to that of hydrothermal muscovite replacing K-feldspar and

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Cannat, M., and J. L. Bouchez. "Lineations N-S en Vendee littorale (Massif Armoricain); episodes tangentiels successifs eo-hercyniens en France occidentale." Bulletin de la Société Géologique de France II, no. 2 (1986): 299–310. http://dx.doi.org/10.2113/gssgfbull.ii.2.299.

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13

Ferenc, Štefan, Martin Števko, Tomáš Mikuš, Stanislava Milovská, Richard Kopáčik, and Eva Hoppanová. "Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)." Minerals 11, no. 6 (2021): 629. http://dx.doi.org/10.3390/min11060629.

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An occurrence of vein U-Mo mineralization is located in the Majerská valley near Čučma, about 7 km to the NNE of the district town of Rožňava (Eastern Slovakia). Mineralization is hosted in the acidic metapyroclastics of the Silurian Bystrý Potok Fm. (Gemeric Unit), and originated in the following stages: (I.) quartz I, fluorapatite I; (II.) quartz II, fluorapatite II, zircon, rutile chlorite, tourmaline; (III.) uraninite, molybdenite, U-Ti oxides; (IV.) pyrite I, ullmannite, gersdorffite, cobaltite; (Va.) galena, bismuth, tetradymite, joséite A and B, Bi3(TeS)2 mineral phase, (BiPb)(TeS) mine

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14

Channell, J. E. T., C. McCabe, T. H. Torsvik, A. Trench, and N. H. Woodcock. "Palaeozoic palaeomagnetic studies, in the Welsh Basin-recent advances." Geological Magazine 129, no. 5 (1992): 533–42. http://dx.doi.org/10.1017/s0016756800021695.

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AbstractIn the last two years, new palaeomagnetic data from Wales have resulted in radical revision of the Ordovician palaeogeography of Eastern Avalonia, part of the southern margin of the Iapetus Ocean. Combined with Palaeozoic palaeomagnetic data from Laurentia and Gondwana, these data suggest that Eastern Avalonia was a peri-Gondwanide high latitude continental fragment during at least part of Ordovician time, with a palaeolatitude of about 62° S and 51° S in Arenig and Llanvirn time, respectively. This implies a latitudinal width of the early Ordovician Iapetus Ocean between Eastern Avalo

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15

Peucat, J. J., P. Jegouzo, P. Vidal, and J. Bernard-Griffiths. "Continental crust formation seen through the Sr and Nd isotope systematics of S-type granites in the Hercynian belt of western France." Earth and Planetary Science Letters 88, no. 1-2 (1988): 60–68. http://dx.doi.org/10.1016/0012-821x(88)90046-5.

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16

Gebelin, Aude, Guillaume Martelet, Maurice Brunel, Michel Faure, and Philippe Rossi. "Late Hercynian leucogranites modelling as deduced from new gravity data : the example of the Millevaches massif (Massif Central, France)." Bulletin de la Société Géologique de France 175, no. 3 (2004): 239–48. http://dx.doi.org/10.2113/175.3.239.

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Abstract The Millevaches granitic complex, located in the northern part of the French Massif Central, is elongated in a N-S direction, perpendicular to the main E-W trend of the Hercynian belt. It is affected on its limits and in its core by several ductile shear zones that have necessarily played a great role in the emplacement and exhumation of the massif. Based on gravity modelling and recent field observations, this study intends to highlight the massif structure at depth and discuss its mode of emplacement and relations with the surrounding terrains. The new gravity and density measuremen

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17

Williamson, B. J., H. Downes, and M. F. Thirlwall. "The relationship between crustal magmatic underplating and granite genesis: an example from the Velay granite complex, Massif Central, France." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 83, no. 1-2 (1992): 235–45. http://dx.doi.org/10.1017/s0263593300007926.

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ABSTRACTThe Velay granite pluton (Massif Central, France) is the youngest (304 ± 5 Ma) and largest (∼6,900 km2) of the major Massif Central monzogranites/granodiorites and was formed nearly 50 Ma after the cessation of Hercynian continental collision (Pin & Duthou 1990). It is a highly heterogeneous pluton consisting of I-type, high-Sr granites (Sr = 500-900 ppm) with low (+35 to +41) and high (-3 to -5), at its centre, grading into S-type and mixed I-S-type heterogeneous granites of more normal Sr content (100–420 ppm) and higher (+40 to +210) and lower (-3·8 to -7.3) at its margins.The m

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18

Zeck, H. P., and M. J. Whitehouse. "Repeated age resetting in zircons from Hercynian–Alpine polymetamorphic schists (Betic–Rif tectonic belt, S. Spain)—a U–Th–Pb ion microprobe study." Chemical Geology 182, no. 2-4 (2002): 275–92. http://dx.doi.org/10.1016/s0009-2541(01)00296-0.

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Germann, Klaus, Volker Lüders, David A. Banks, Klaus Simon, and Jochen Hoefs. "Late Hercynian polymetallic vein-type base-metal mineralization in the Iberian Pyrite Belt: fluid-inclusion and stable-isotope geochemistry (S–O–H–Cl)." Mineralium Deposita 38, no. 8 (2003): 953–67. http://dx.doi.org/10.1007/s00126-002-0342-z.

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20

Petrescu, Laura, Silvia Pondrelli, Simone Salimbeni, and Manuele Faccenda. "Mantle flow below the central and greater Alpine region: insights from SKS anisotropy analysis at AlpArray and permanent stations." Solid Earth 11, no. 4 (2020): 1275–90. http://dx.doi.org/10.5194/se-11-1275-2020.

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Abstract. The Alpine chain in western and central Europe is a complex orogen developed as a result of the African–Adriatic plate convergence towards the European continent and the closure of several Tethys oceanic branches. Seismic tomography studies detected high-wave-speed slabs plunging beneath the orogen to variable depths and a potential change in subduction polarity beneath the Central Alps. Alpine subduction is expected to leave a significant imprint on the surrounding mantle fabrics, although deformation associated with the Hercynian Orogeny, which affected Europe prior to the collisio

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Roure, Myriam, and Marie-Louise Bouillant. "Development and application of a bioassay to study the effects of nutrients, pH, and active substances on Sordaria macrospora fruiting." Canadian Journal of Microbiology 32, no. 12 (1986): 930–36. http://dx.doi.org/10.1139/m86-172.

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The perithecial development of Sordaria macrospora (Auersw.) is prevented by ammonium salts as nitrogen source, but only below a critical initial pH in the culture medium. Around this point, a very small variation in the initial pH can induce a morpho-genetic change. Within the inhibition range, supplementation of the culture medium with aqueous cell-free extracts from the fruiting mycelia or fruiting bodies of some fungi overcomes the ammonium inhibition. This phenomenon was used to develop a biological test which could be used to isolate, for the determination of their chemical structure, ac

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Cao, Xiao Feng, Xin Biao Lu, Shen Tai Liu, et al. "Ore Genesis of Caixiashan Pb-Zn Deposit in Middle Tianshan, NW China." Advanced Materials Research 455-456 (January 2012): 1366–70. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1366.

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Caixiashan Pb-Zn deposit is the largest Pb-Zn deposit discovered in the middle Tianshan area. Examples of Carboniferous magmatic and tectonic activity are widely distributed. The ore bodies are controlled by EW trend faults, based on field observations. The main ore minerals are galena, sphalerite, pyrrhotite, pyrite and chalcopyrite, while quartz, sericite and calcite are the main alteration minerals. The ore also exhibits minerals zoning. In addition, the wide range of S isotopic composition, high temperature and moderate salinity of fluid inclusions, and good correlation of ore and wall roc

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Arthur, M. J. "The Cenozoic evolution of the Lundy Pull-Apart Basin into the Lundy Rhomb Horst." Geological Magazine 126, no. 2 (1989): 187–98. http://dx.doi.org/10.1017/s0016756800006324.

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AbstractThe NW–SE Cornubian fault zones (FZs) continue to southwest Wales, where they caused dextral offsets during the late Stephanian. A fault bounded area of Devonian–Carboniferous strata, intruded by the Tertiary Lundy Igneous Complex, forms the Lundy Rhomboid. It originated as the Lundy Rhomb Graben, created by 28–40 km of Tertiary sinistral strike–slip faulting along the left-stepping NW–SE Sticklepath–Lustleigh FZ (SLFZ). Tertiary sedimentation in the graben was accompanied by intrusion of the 2.5–4.0 km thick igneous complex into its basement. Sedimentation later spread beyond the grab

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Barbero, L., and C. Villaseca. "The Layos Granite, Hercynian Complex of Toledo (Spain): an example of parautochthonous restite-rich granite in a granulitic area." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 83, no. 1-2 (1992): 127–38. http://dx.doi.org/10.1017/s0263593300007811.

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ABSTRACTThe Layos Granite forms elongated massifs within the Toledo Complex of central Spain. It is late-tectonic with respect to the F2 regional phase and simultaneous with the metamorphic peak of the region, which reached a maximum temperature of 800–850°C and pressures of 400–600 MPa. Field studies indicate that this intrusion belongs to the “regional migmatite terrane granite” type. This granite is typically interlayered with sill-like veins and elongated bodies of cordierite/garnet-bearing leucogranites. Enclaves are widespread and comprise restitic types (quartz lumps, biotite, cordierit

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Garcia-Talegon, Jacinta, Adolfo C. Iñigo, Santiago Vicente-Tavera, and Eloy Molina-Ballesteros. "Heritage Stone 5. Silicified Granites (Bleeding Stone and Ochre Granite) as Global Heritage Stone Resources from Ávila, Central Spain." Geoscience Canada 43, no. 1 (2016): 53. http://dx.doi.org/10.12789/geocanj.2016.43.087.

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Silicified granites were used to build the Romanesque monuments in the city of Ávila, Spain. The building stones comprise two types of granite based on their technical properties and colour: Bleeding Stone (Piedra Sangrante) and Ochre Granite (Caleño). They were used as a facing stone in the city´s Romanesque monuments of the 12th century (e.g. the cathedral and church of San Pedro), and the famous city walls that constitute the best example of military Romanesque Spanish architecture. During the Gothic and Renaissance periods of the 13th and 15th centuries, silicified granites were used mainl

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FESTA, VINCENZO, ALFREDO CAGGIANELLI, ANTONIO LANGONE, and GIACOMO PROSSER. "Time–space relationships among structural and metamorphic aureoles related to granite emplacement: a case study from the Serre Massif (southern Italy)." Geological Magazine 150, no. 3 (2012): 441–54. http://dx.doi.org/10.1017/s0016756812000714.

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AbstractTectonic and thermal perturbations, related to emplacement of granodiorite in the upper continental crust, have been investigated in the late-Hercynian basement exposed in southern Calabria (Italy). Here, the structural aureole is marked by the presence of a major rim fold adjacent to the intrusive contact for a length of at least 20 km. Geometrical analysis of the structural aureole and related foliations, lineations and crenulations reveals that the perturbed zone is at least 3000 m wide and characterized by an open synform trending nearly parallel to the intrusive contact. This patt

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DOSTAL, J., J. D. KEPPIE, M. A. HAMILTON, E. M. AARAB, J. P. LEFORT, and J. B. MURPHY. "Crustal xenoliths in Triassic lamprophyre dykes in western Morocco: tectonic implications for the Rheic Ocean suture." Geological Magazine 142, no. 2 (2005): 159–72. http://dx.doi.org/10.1017/s0016756805000440.

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Dykes of calc-alkaline lamprophyre cutting granite of the Hercynian Jebilet Massif of the Moroccan Meseta (western Morocco) contain crustal xenoliths. The xenoliths range in composition from mafic (cognate cumulates) and upper crustal granitic rocks through gneisses to middle crustal felsic granulites. SHRIMP U–Th–Pb zircon analyses of these rocks indicate that the dykes were likely intruded during Middle Triassic times (∼235 Ma), whereas the xenoliths contain zircons with concordant Carboniferous–Early Permian, Neoproterozoic and Palaeoproterozoic ages (280–328 Ma, c. 540–615 Ma, 700 Ma and ∼

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Szaniawski, Rafal, Marek Lewandowski, Jean-Louis Mansy, Olivier Averbuch, and Frederic Lacquement. "Syn-folding remagnetization events in the French-Belgium Variscan thrust front as markers of the fold-and-thrust belt kinematics." Bulletin de la Société Géologique de France 174, no. 5 (2003): 511–23. http://dx.doi.org/10.2113/174.5.511.

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Abstract New paleomagnetic studies have been carried out within the Ardennes segment of the N France - S Belgium Variscan fold-and-thrust belt to set constraints on the fold-thrust belt kinematics and reveal the casual relationships between vertical-axis rotations and major strike deviated zones localised along the general trend of the belt. Magnetite-bearing Devonian and Carboniferous limestones yielded two characteristic, secondary components of the natural remanent magnetization : a low temperature component recorded most probably during the late stages of folding and a high temperature com

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Ciobanu, Cristiana L., Max R. Verdugo-Ihl, Ashley Slattery, et al. "Silician Magnetite: Si–Fe-Nanoprecipitates and Other Mineral Inclusions in Magnetite from the Olympic Dam Deposit, South Australia." Minerals 9, no. 5 (2019): 311. http://dx.doi.org/10.3390/min9050311.

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A comprehensive nanoscale study on magnetite from samples from the outer, weakly mineralized shell at Olympic Dam, South Australia, has been undertaken using atom-scale resolution High Angle Annular Dark Field Scanning Transmission Electron Microscopy (HAADF STEM) imaging and STEM energy-dispersive X-ray spectrometry mapping and spot analysis, supported by STEM simulations. Silician magnetite within these samples is characterized and the significance of nanoscale inclusions in hydrothermal and magmatic magnetite addressed. Silician magnetite, here containing Si–Fe-nanoprecipitates and a divers

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Sluzhenikin, Sergey F., Marina A. Yudovskaya, Stephen J. Barnes, et al. "Low-Sulfide Platinum Group Element Ores of the Norilsk-Talnakh Camp." Economic Geology 115, no. 6 (2020): 1267–303. http://dx.doi.org/10.5382/econgeo.4749.

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Abstract Low-sulfide platinum group element (PGE) mineralization of the Norilsk-type intrusions is located within the Upper Gabbroic Series, which comprises rocks heterogeneous in texture and composition. The highest grade of 10 to 50 g/t PGEs is confined primarily to chromitiferous taxitic gabbrodolerite, which forms irregular lens- and vein-like bodies that interfinger with contact gabbrodolerite, intrusion breccia, leucogabbro, and gabbrodolerite variably enriched in olivine, from olivine free up to picritic compositions. The abundant amygdules and pegmatoidal textures in Upper Gabbroic Ser

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Manyuk, Volodymyr V. "Hercynian folded structures in the valley of the Mokra Volnovaha River as the basis of a Geological park at the border of the Donbas and the Ukrainian Shield." Journal of Geology, Geography and Geoecology 29, no. 2 (2020): 351–63. http://dx.doi.org/10.15421/112031.

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The basin of the Mokra Volnovaha River, from the Mykolaivka village to the place where it flows into the Kalmius River, exposes an extremely informative geological cross-section of the conjunction of the Pryazov block of the Ukrainian Shield (US) with the complexly located Donetsk Hercynian structure. The results of the survey of this area are presented and the perspectives for creation of the MafHaia Geological Park named after the important paleo-volcanic structure are substantiated. The most significant events related to the geological studies of the regions from the academic expeditions of

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Reyx, Jean, and François Ruhlmann. "Étude métallographique des différentes associations minérales et caractérisation chimique des minéraux uranifères du gisement de Cigar Lake (Saskatchewan, Canada)." Canadian Journal of Earth Sciences 30, no. 4 (1993): 705–19. http://dx.doi.org/10.1139/e93-057.

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The Cigar Lake deposit, discovered in 1981, represents one of the richest uranium occurrences known in the province of Saskatchewan. The eastern margin of the Athabasca Basin can be considered as one of the richest uraniferous provinces in the Western World.Being located at the unconformity between the Aphebian metasediments and the Helikian sandstone cover, this deposit is classified in the group of deposits spatially related to the Proterozoic unconformity. The study of this deposit, exceptional in its dimensions, grade, and tonnage, was made possible through a series of 170 boreholes drille

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Taylor, Hugh P. "Oxygen, hydrogen, and strontium isotope constraints on the origin of granites." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 79, no. 2-3 (1988): 317–38. http://dx.doi.org/10.1017/s0263593300014309.

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ABSTRACTOxygen isotope data are very useful in determining the source rocks of granitic magmas, particularly when used in combination with Sr, Pb, and Nd isotope studies. For example, unusually high δ18O values in magmas (δ18O> +8) require the involvement of some precursor parent material that at some time in the past resided on or near the Earth's surface, either as sedimentary rocks or as weathered or hydrothermally altered rocks. The isotopic systematics which are preserved in the Mesozoic and Cenozoic batholiths of western North America can be explained by grand-scale mixing of three br

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de Graciansky, Pierre-Charles, and Thierry Jacquin. "Structural and palaeogeographical evolution of the Paris Basin during the Mid-Cimmerian events." Bulletin de la Société Géologique de France 174, no. 1 (2003): 3–17. http://dx.doi.org/10.2113/174.1.3.

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Abstract Presentation. The deposition of unconformable condensed layers associated with frequent sedimentary gaps record the Mid-Cimmerian events in the Paris Basin, dated as Aalenian to lowermost Bajocian. In order to document the Mid-Cimmerian episodes, a set of 250 commercial wells (fig. 1) together with several outcropping sections located on the southern and southeastern borders of the Paris Basin have been interpreted in terms of sequence stratigraphy. Seventeen third-order depositional sequences sensu Vail et al. [1991] have been identified and correlated. These are numbered as To1 to T

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Soulaimani, Abderrahmane, Mohamed Bouabdelli, and Alain Piqué. "The Upper Neoproterozoic-Lower Cambrian continental extension in the Anti-Atlas (Morocco)." Bulletin de la Société Géologique de France 174, no. 1 (2003): 83–92. http://dx.doi.org/10.2113/174.1.83.

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Abstract Introduction. – In the Anti-Atlas, south of Morocco (fig. 1), the Precambrian terrains are usually divided into several “series” (fig. 2) : the Paleoproterozoic (PI) is an old crystalline basement, at least Eburnean ; the Neoproterozoic (PII) is constituted by metasedimentary rocks, quartzites and limestones, indicative of a shelf, in which volcano-sedimentary and volcanic flows are intercalated, laterally grading to an ophiolitic complex along the Sirwa-Bou Azzer axis. These PII rocks have been deformed in the course of the Panafrican orogeny ; above the underlying upper Proterozoic

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