Petrogenesis of Early Neogene Magmatism in the Northern Puna; Implications for Magma Genesis and Crustal Processes in the Central Andean Plateau   总被引：4，自引：1，他引：4  

CAFFE  PABLO J.; TRUMBULL  ROBERT B.; COIRA  BEATRIZ L.; ROMER  ROLF L. 《Journal of Petrology》2002,43(5):907-942

New compositional data and petrogenetic models are presentedfor pre-Upper Miocene volcanism in the northern Puna of Argentina(22°S–24°S). Two phases of volcanism producedsmall dome complexes of mainly silicic andesite to low-SiO₂rhyolite. The Upper Oligocene–Lower Miocene phase (UOLM,20–17 Ma), produced two distinct groups of rocks. TheUOLM-1 group is metaluminous and mainly andesitic, with isotopiccompositions like those of the recent arc (⁸⁷Sr/⁸⁶Sr_T  相似文献   

Production and stable isotopic composition of CO₂ in a soil near Bern, Switzerland   总被引：2，自引：0，他引：2  

ROLF HESTERBERG  ULRICH SIEGENTHALER 《Tellus. Series B, Chemical and physical meteorology》1991,43(2):197-205

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The Pleistocene/Holocene boundary in marine deposits from the Oslofjord area     

ROLF W. FEYLING-HANSSEN 《Boreas: An International Journal of Quaternary Research》1972,1(3):241-246

Feyling-Hanssen, R. W.: The Pleistocene/Holocene boundary in marine deposits from the Oslofjord area. Boreas, Vol. 1, pp. 241–246. Oslo 1st September, 1972.
In marine deposits from the southern Oslofjord area in Norway the boundary between Holocene and Pleistocene is found within a formation characterized by Arctic species, the so-called Yoldia Clay or zone A in the foraminiferal stratigraphy. The fossil assemblage on the Holocene side of the boundary is even poorer than that on the Pleistocene side, which is explained by the rapid Preboreal ice recession. The boundary is not conspicuously reflected in the faunas but still discernible and applicable.  相似文献   

The pre-Holocene marine limit on Hopen, Svalbard     

ROLF ZALE  LARS BRYDSTEN 《Boreas: An International Journal of Quaternary Research》1993,22(2):159-164

A pre-Holocene marine level is found at 109 m a.s.1. on Hopen. Fragments of Mya truncata and Hiatella arctica occurring on a raised coastal spit at that altitude have been radiocarbon dated to >45,000 BP. The amino acid epimerization of these shells, a clearly mixed sample, correlates with samples from Kongsøya that are of Eemian or Early Weichselian age (alloisoleucine/isoleucine ratios, hydrolysed fraction, between 0.084 and 0.213). No direct evidence, such as striations or roche moutonées, of overriding glacier ice has been found, and no erratics were found above the pre-Holocene marine limit. The existing Holocene shoreline displacement curve, with its upper limit at 60 m a.s.1., is supported by four new radiocarbon dates.  相似文献   

Late Weichselian deglaciation in the Oslofjord area, south Norway   总被引：2，自引：0，他引：2  

ROLF SØRENSEN 《Boreas: An International Journal of Quaternary Research》1979,8(2):241-246

The older 'moraine lines' outside the Ra Moraine in the outer Oslofjord area have been correlated with events in Bohuslän, Sweden. Recent radiocarbon datings in the vicinity of the Ra Moraine and a radiocarbon dated sea-level curve for the Ski area show that the Ra Moraine was formed during the Early Younger Dryas, whereas the Ski Moraine was formed at the end of the Younger Dryas chronozone. An equidistant shoreline diagram together with a large number of marine limit observations have been used to establish the position of the glacier front during Late Younger Dryas and Early Preboreal chronozones. Reconnaissance mapping indicates a fairly regular recession with many short stops during the Bølling, Older Dryas and Allerød chronozones; at least two readvances to the Ra Moraine before 10,600 years B.P.; a rapid recession during the Middle Younger Dryas and a number of ice-front oscillations at the end of the Younger Dryas chronozone.  相似文献   

The stratigraphy of the Quaternary Clyde Foreland Formation, Baffin Island, illustrated by the distribution of benthic foraminifera     

ROLF W. FEYLING-HANSSEN 《Boreas: An International Journal of Quaternary Research》1976,5(2):77-94

The Clyde Foreland Formation is defined as comprising unconsolidated or only slightly consolidated deposits, varying in grain size from very coarse boulder gravel to clay, situated between the outermost part of Clyde Inlet and the coastal mountains west-northwest of Kogalu River on the northeast coast of Baffin Island, Arctic Canada. They outcrop in an up to 40 m high almost straight-lined coastal cliff facing Baffin Bay and are composed of mainly marine deposits interbedded with glacigenic layers. Investigation of assemblages of fossil foraminifera revealed three main stratigraphical units of the marine deposits, viz., the hlandiella zone, being the youngest, the Cibicides rotundatus zone, and the Nonion tallahattensis zone, being the oldest. The hlandiella zone is supposed to be upper Pleistocene of age, comprising a large Mid-Wisconsinian (Mid-Weichselian) interstadial, and an interglacial that can be correlated with the Sangamonian (Eemian) interglacial. The Cibicides rotundatus zone may comprise Illinoian interstadial deposits as well as deposits of Yarmouthian (Holsteinian) interglacial age. The Nonion tallahattensis zone represents an older (Aftonian?) mild interval.  相似文献   

Year-round chemical aerosol records in continental Antarctica obtained by automatic samplings     

ROLF WELLER  DIETMAR WAGENBACH 《Tellus. Series B, Chemical and physical meteorology》2007,59(4):755-765

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Notes on the appropriateness of "bred modes" for generating initial perturbations used in ensemble prediction     

BY RONALD M. ERRICO    ROLF LANGLAND 《地球，A辑:动力气象学与海洋学》1999,51(3):431-441

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A national landfill methane budget for Sweden based on field measurements, and an evaluation of IPCC models     

By GUNNAR BÖRJESSON  JERKER SAMUELSSON  JEFFREY CHANTON  ROLF ADOLFSSON  BO GALLE  BO H. SVENSSON 《Tellus. Series B, Chemical and physical meteorology》2009,61(2):424-435

Seven Swedish landfills were investigated from 2001 to 2003. On each landfill, a measure of the total methane production was calculated from data on: (1) methane emissions (leakage); (2) methane oxidation and (3) from gas recovery.
Methane emissions were determined via a tracer gas (N₂O) release-based remote sensing method. N₂O and CH₄ were measured with an Fourier Transform infrared detector at a distance of more than 1 km downwind from the landfills. Methane oxidation in the landfill covers was measured with the stable carbon isotope method. The efficiency in gas recovery systems proved to be highly variable, but on an average, 51% of the produced landfill gas was captured.
A first-order decay model, based on four fractions (waste from households and parks, sludges and industrial waste), showed that the use of a degradable organic carbon fraction (DOCf) value of 0.54, in accordance with the default value for DOCf of 0.50 in the latest IPCC model, gave an emission estimate similar to the official national reports.  相似文献   

Validation of surface fluxes in climate simulations of the Arctic with the regional model REMO     

ROLF. JÜRRENS 《地球，A辑:动力气象学与海洋学》1999,51(5):698-709

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