Zur Deutung der Vertikalbewegungen der Festländer und Meere     

Franz E. Sueß 《International Journal of Earth Sciences》1921,11(5-6):249-263

Ohne Zusammenfassung  相似文献   

Geo-networking     

Sue Bowler 《Geology Today》1999,15(4):135-137

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The nature of molecular cloud material in interplanetary dust     

Lindsay P. Keller  Scott Messenger  George J. Flynn  Sue Wirick 《Geochimica et cosmochimica acta》2004,68(11):2577-2589

Eight interplanetary dust particles (IDPs) exhibiting a wide range of H and N isotopic anomalies have been studied by transmission electron microscopy, x-ray absorption near-edge structure spectroscopy, and Fourier-transform infrared spectroscopy. These anomalies are believed to have originated during chemical reactions in a cold molecular cloud that was the precursor to the Solar System. The chemical and mineralogical studies reported here thus constitute direct studies of preserved molecular cloud materials. The H and N isotopic anomalies are hosted by different hydrocarbons that reside in the abundant carbonaceous matrix of the IDPs. Infrared measurements constrain the major deuterium (D) host in the D-enriched IDPs to thermally labile aliphatic hydrocarbon groups attached to macromolecular material. Much of the large variation observed in D/H in this suite of IDPs reflects the variable loss of this labile component during atmospheric entry heating. IDPs with elevated ¹⁵N/¹⁴N ratios contain N in the form of amine (-NH₂) functional groups that are likely attached to other molecules such as aromatic hydrocarbons. The host of the N isotopic anomalies is not as readily lost during entry heating as the D-rich material. Infrared analysis shows that while the organic matter in primitive anhydrous IDPs is similar to that observed in acid residues of primitive chondritic meteorites, the measured aromatic:aliphatic ratio is markedly lower in the IDPs.  相似文献   

The implications for paleodietary and paleoclimatic reconstructions of intrapopulation variability in the oxygen and carbon isotopes of teeth from modern feral horses     

Kathryn A. Hoppe  Sue Stuska 《Quaternary Research》2005,64(2):138-146

We analyzed the isotopic patterns found in the tooth enamel of modern feral horses from Shackleford Banks, North Carolina (USA), which has a temperate climate and supports primarily C₄ grasslands. Enamel δ¹³C values averaged −4.1‰ with a standard deviation (1σ) of 1.7‰, which corresponds to an average diet of 66 ± 12% C₄ plants. Our results differ from dietary reconstructions from 1978 to 1981, which found that horses consumed 91% C₄ plants. This suggests that horses have increased their consumption of C₃ forbs, likely as a result of the removal of cattle, sheep, and goats from the island. Shackleford surface waters had δ¹⁸O values that averaged −3.3 ± 0.5‰ and −1.3 ± 1.8‰ on the western and eastern ends of the island, respectively. Tooth enamel samples averaged 27.3 ± 1.5‰ and displayed the same range of δ¹⁸O values as surface waters. The variability of both δ¹⁸O and the δ¹³C values among individuals within this population demonstrates that horses from relatively homogenous temperate environments can display a wide range of isotopic values. Given the observed range of isotopic values for modern horses, we suggest that researchers use the mean values of multiple (≥9) equids when attempting to reconstruct average paleodiets and/or paleoenvironmental conditions.  相似文献   

Bradford Sturtevant, 1933-2000     

Youxue Zhang  Heidy Mader  Emily Brodsky  Hiroo Kanamori  Sue Kieffer  Jeremy Phillips  Joe Shepherd  Steve Sparks 《Bulletin of Volcanology》2002,63(8):569-571

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Fold interference patterns in the Late Palaeozoic Anti-Atlas belt of Morocco     

Caritg Séverine  Burkhard Martin  Ducommun Romain  Helg Urs  Kopp Lionel  Sue Christian 《地学学报》2004,16(1):27-37

We document two phases of folding within the central part of the Late Palaeozoic Anti‐Atlas chain of Morocco. A first generation of SW–NE folds involve a horizontal shortening of 10–20%, accommodated by polyharmonic buckle folding of contrasting wavelengths in Ordovician Jbel Bani quartzites and Devonian Jbel Rich carbonates. A second generation of folds with similar style and wavelengths in an E–W direction lead to complex interference patterns. Dome and basins are developed within the Jbel Rich and within Lower Cambrian dolomites. Both folding phases are related to thick‐skinned uplift of Precambrian basement in a Laramide style. In contrast to the typical Rocky Mountain foreland style, however, cover deformation in the Anti‐Atlas is mostly decoupled from the undying basement along thick incompetent horizons such as the Lower Cambrian Lie‐de‐Vin and Silurian shales.  相似文献   

Diatom biostratigraphy of tsunami deposits: Examples from the 1998 Papua New Guinea tsunami     

Sue Dawson   《Sedimentary Geology》2007,200(3-4):328-335

Distinctive diatom assemblages may be associated with tsunami sediments and may often contrast with the assemblages found within sediments underlying the tsunami deposit as well as those associated with the modern coastal environment. Sediments associated with the 1998 tsunami that destroyed much of the Sissano lagoon area in northern Papua New Guinea have been investigated. Surface sediments from three transects across the sediment spit near Warapu have been examined for diatom content and preservation. The preservation is variable, and the data show an, often chaotic, assemblage that can be attributed to the tsunami waves incorporating and depositing diatoms from distinctive habitat zones during their runup and subsequent backwash. The diatoms identified within the Warapu sediments indicate an origin from within the inter-tidal and offshore area rather than from the beach–sand spit complex. The sand deposits disclose a high percentage, in excess of 75%, of broken diatom valves, and a predominance of centric (circular) species due to preferential preservation. The study demonstrates that the application of diatom biostratigraphy to modern tsunami deposits can be used in conjunction with other stratigraphical lines of evidence to interpret the source and provenance of historical and palaeo-tsunami deposits.  相似文献   

YAM@NAM 2007     

Sue Bowler  Editor 《Astronomy& Geophysics》2007,48(3):3.04-3.04

Delegates at the simultaneous National Astronomy Meeting, UK Solar Physics meeting and Spring MIST meeting were impressed by the warm welcome and efficient organization from the hosts, the University of Central Lancaster in Preston. The meetings were successful in terms of the number of participants and the breadth and depth of science discussed, but also in terms of the spread of that science across the media.  相似文献   

Elevated mercury concentrations in failed eggs of Snowy Plovers at Point Reyes National Seashore     

Schwarzbach SE  Stephenson M  Ruhlen T  Abbott S  Page GW  Adams D 《Marine pollution bulletin》2005,50(11):1444-1447

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IGU Commission of the Geography of Tourism and Leisure     

B. Barbier  Alison Arnott  Jon Best  Brian Duffield  Sue Walker 《GeoJournal》1982,6(2):193-193

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