Search Results - "Cliff, R. A"

Metamorphic evolution of the Sesia-Lanzo Zone, Western Alps: time constraints from multi-system geochronology by Inger, S., Ramsbotham, W., Cliff, R. A., Rex, D. C.

“…The Sesia-Lanzo Zone is a polymetamorphic unit containing Hercynian granulite relics overprinted by eclogite and greenschist facies metamorphism and…”
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Direct dating of mylonite evolution; a multi-disciplinary geochronological study from the Moine thrust zone, NW Scotland by Freeman, S. R, Butler, R. W. H, Cliff, R. A, Rex, D. C

“…Pb-Sr dating of sub-closure T, syndeformationally crystallized white micas from the Moine mylonites at Knockan and Dundonnell has given ages of 437-408 m.y…”
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Geochronological challenges posed by continuously developing tectonometamorphic systems: insights from Rb–Sr mica ages from the Cycladic Blueschist Belt, Syros (Greece) by Cliff, R. A., Bond, C. E., Butler, R. W. H., Dixon, J. E.

“…Is metamorphism and its causative tectonics best viewed as a series of punctuated events or as a continuum? This question is addressed through examination of…”
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Pliocene–Pleistocene climate of the northern margin of Saharan–Arabian Desert recorded in speleothems from the Negev Desert, Israel by Vaks, A., Woodhead, J., Bar-Matthews, M., Ayalon, A., Cliff, R.A., Zilberman, T., Matthews, A., Frumkin, A.

“…The Middle–Late Pliocene climate was 2–3°C warmer than today, but with similar levels of atmospheric CO2. This period reflects climate conditions expected in…”
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Kinematic linkage between internal zone extension and shortening in more external units in the NW Alps by Wheeler, J, Reddy, S. M, Cliff, R. A

“…In the Alps a major extensional shear zone unroofed eclogites in its footwall from 30 kbar to c. 10 kbar, implying of the order of 60 km of relative vertical…”
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A Tertiary age for Alpine high-pressure metamorphism in the Gran Paradiso massif, Western Alps: a Rb-Sr microsampling study by Meffan-Main, S., Cliff, R. A., Barnicoat, A. C., Lombardo, B., Compagnoni, R.

“…The timing of high‐pressure (HP) metamorphism in the internal basement massifs of the Western Alps has been contentious. In the Gran Paradiso massif silvery…”
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Early Tertiary eclogite facies metamorphism in the Monviso Ophiolite by CLIFF (email: ), R. A., BARNICOAT, A. C., INGER, S.

“…Although crucial for the construction of tectonic models of the Alps the timing of high pressure metamorphism is still poorly determined and controversial. It…”
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The characterisation of Saharan dusts and Nile particulate matter in surface sediments from the Levantine basin using Sr isotopes by Krom, M.D, Cliff, R.A, Eijsink, L.M, Herut, B, Chester, R

“…The provenance of sediments within the Levantine basin of the eastern Mediterranean was studied using 87Sr/ 86Sr isotopic ratios, together with major elements…”
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Response of the Nile and its catchment to millennial-scale climatic change since the LGM from Sr isotopes and major elements of East Mediterranean sediments by Box, M.R., Krom, M.D., Cliff, R.A., Bar-Matthews, M., Almogi-Labin, A., Ayalon, A., Paterne, M.

“…Changes in 87Sr/ 86Sr and major element geochemistry, from two sediment cores (9509 and 9501) in the Eastern Mediterranean (EM), were used to resolve changes…”
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Dating deformation using Rb-Sr in white mica: Greenschist facies deformation ages from the Entrelor shear zone, Italian Alps by Freeman, S. R., Inger, S., Butler, R. W. H., Cliff, R. A.

“…Ages of deformation have been obtained by Rb‐Sr analysis of white micas whose microstructural and chemical characteristics indicate that they crystallized or…”
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Syn-metamorphic folding in the Tauern Window, Austria dated by Th-Pb ages from individual allanite porphyroblasts by Cliff, R. A., Oberli, F., Meier, M., Droop, G. T. R., Kelly, M.

“…High‐precision 232Th–208Pb dates have been obtained from allanite porphyroblasts that show unambiguous microstructural relationships to fabrics in a major…”
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Speleothems from the earliest Quaternary: Snapshots of paleoclimate and landscape evolution at the northern rim of the Alps by Meyer, M.C., Cliff, R.A., Spötl, C., Knipping, M., Mangini, A.

“…Ancient cave systems in the Northern Calcareous Alps, today located well above the timberline at altitudes of 2400–2500 m, host U-rich speleothems that…”
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Sources of sediment to the Ionian Sea and western Levantine basin of the Eastern Mediterranean during S-1 sapropel times by Krom, M.D, Michard, A, Cliff, R.A, Strohle, K

“…The provenance of sediments to the Ionian Sea and western Levantine basin during S-1 sapropel times was studied using 87 Sr/ 86 Sr isotopic ratios together…”
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Isotopic dating in metamorphic belts by Cliff, R. A

“…Isotopic dating in metamorphic rocks is concerned with the timing of processes whose operation is controlled by continually changing physical conditions; T has…”
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The timing of and nature of greenschist facies deformation and metamorphism in the upper Pennine Alps by Barnicoat, A. C., Rex, D. C., Guise, P. G., Cliff, R. A.

“…The upper Pennine nappes in the western Alps are cut by structures that locally place European basement rocks over those of the Piemonte zone, which represent…”
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U-Pb and Rb-Sr geochronology of magmatism and metamorphism in the Dalradian of Connemara, western Ireland by Cliff, R. A, Yardley, B. W. D, Bussy, F. R

“…U-Pb zircon data on four intermediate to acid foliated magmatic rocks show important inherited components, but the most concordant fractions demonstrate that…”
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Sm-Nd and Pb isotopic study of mafic rocks associated with early Proterozoic continental rifting: the Peräpohja schist belt in northern Finland by HUHMA, H, CLIFF, R. A, PERTTUNEN, V, SAKKO, M

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Evidence for a regional-scale fluid loss event during mid-crustal metamorphism by Yardley, Bruce, Bottrell, Simon H, Cliff, R. A

“…Metamorphic fluid flow on a regional scale is studied using a combination of field geology, petrology and theoretical and isotope geochemistry…”
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The geometry and timing of orogenic extension: an example from the Western Italian Alps by Reddy, Wheeler, Cliff

“…Contacts between rocks recording large differences in metamorphic grade are indicative of major tectonic displacements. Low‐P upon high‐P contacts are commonly…”
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Kinematic reworking and exhumation within the convergent Alpine Orogen by Reddy, S.M., Wheeler, J., Butler, R.W.H., Cliff, R.A., Freeman, S., Inger, S., Pickles, C., Kelley, S.P.

“…Kinematic data from the internal zones of the Western Alps indicate both top-to-SE and top-to-NW shearing during synkinematic greenschist facies…”
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