scholarly journals Gravel size matters: Early Middle Palaeolithic artefacts made from local Rhine and Meuse deposits in the central Netherlands

2016 ◽  
Vol 96 (3) ◽  
pp. 261-271 ◽  
Author(s):  
D.F.A.M. van den Biggelaar ◽  
R.T. van Balen ◽  
S.J. Kluiving ◽  
A. Verpoorte ◽  
G.M. Alink
Keyword(s):  
Rock Material ◽  
Published Data ◽  
Middle Palaeolithic ◽  
Fluvial System ◽  
Literature Study ◽  
Polar Desert ◽  
Incised Valley ◽  
The North ◽  
Gravel Size ◽  
Bearing Layer

AbstractThe artefact size of the Early Middle Palaeolithic (EMP) assemblages in ice-pushed Rhine–Meuse deposits in the central Netherlands decreases northwestward. This trend correlates to the downstream fining direction of the Rhine–Meuse fluvial system, the source of the rock material, showing that locally available material was used. Furthermore, also in line with the fluvial trend, the gravel and cobble trends indicate that EMP artefacts could be present in the buried part of the ice-pushed ridges in the northern part of the central Netherlands (southwest Flevoland). Based on the gravel and cobble data, combined with the literature study, we argue that the artefacts date to marine isotope stages (MIS) 7–6. The review of published data shows that during the time of deposition of the artefact-bearing layer (early MIS 6), the Rhine–Meuse study area was part of a braidplain located in a slightly incised valley. To the north a polar desert was present.

scholarly journals Human presence in the central Netherlands during early MIS 6 (~170-190 Ka): evidence from early Middle Palaeolithic artefacts in ice-pushed Rhine-Meuse sediments

2010 ◽  
Vol 89 (1) ◽  
pp. 77-83 ◽  
Author(s):  
R.T. van Balen ◽  
F.S. Busschers
Keyword(s):  
Significant Part ◽  
Original Position ◽  
Middle Pleistocene ◽  
Published Data ◽  
Middle Palaeolithic ◽  
Faunal Remains ◽  
Fluvial System ◽  
Fluvial Transport ◽  
Absolute Age ◽  
Age Constraints

AbstractPart of the gravelly deposits of a combined Rhine-Meuse river of Middle Pleistocene age in the central Netherlands contains early Middle Palaeolithic artefacts. Although not in their original position, a significant part of these artefacts is hardly abraded, indicating limited fluvial transport. The artefacts have mainly been made from fluvial flint gravel boulders, originating from the Meuse catchment. Thus far, inferences for the age of the artefacts are based on the stratigraphic context and floral and faunal remains, which suggest a MIS 7 age. In this paper, OSL dating carried-out in the framework of a research aimed at the paleogeographical reconstruction of the Rhine-Meuse fluvial system in the central Netherlands and a review of published data are used to provide absolute age constraints for the artefact-bearing deposits. It is argued that the deposits were formed during the glacial phase directly preceding the Drenthe substage of the late Saalian (early MIS 6), and that at least a part of the artefacts has approximately the same age.

scholarly journals Amphipod (Crustacea, Amphipoda) Communities in the North-Western Part of the Black Sea

2016 ◽  
Vol 50 (5) ◽  
pp. 387-394
Author(s):  
S. A. Kudrenko
Keyword(s):  
Species Composition ◽  
Community Composition ◽  
Black Sea ◽  
The Black Sea ◽  
Published Data ◽  
Amphipod Species ◽  
Quantitative Parameters ◽  
The North ◽  
North Western

Abstract The data about the community composition, number and biomass of amphipods in three gulfs of the North-Western Black Sea are presented. The amphipod communities of the gulfs of Yahorlyk, Karkinit, and Tendra were studied and the species composition was compared with the previously published data. For each particular gulf, the list of amphipod species was composed. The quantitative parameters of the amphipod communities in the studied localities in different years were described.

A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution

2020 ◽  
Vol 157 (11) ◽  
pp. 1877-1897 ◽  
Author(s):  
J.-X. Wang ◽  
K.-X. Zhang ◽  
Brian F. Windley ◽  
B.-W. Song ◽  
X.-H. Kou ◽  
...  
Keyword(s):  
Continental Crust ◽  
Early Carboniferous ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Published Data ◽  
Zircon Age ◽  
The North ◽  
Tectonic History ◽  
Central Asian ◽  
Tectonic Mélange

AbstractAccretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage.

Metallogenetic significance of a North Pennine springwater

1990 ◽  
Vol 54 (377) ◽  
pp. 629-636 ◽  
Author(s):  
D. A. C. Manning ◽  
D. W. Strutt
Keyword(s):  
Minor Component ◽  
Spring Water ◽  
Published Data ◽  
Significant Component ◽  
Sedimentary Sequences ◽  
The North ◽  
Saline Waters ◽  
Saline Spring ◽  
Mineralizing Fluids ◽  
Mineralizing Potential

AbstractThe occurrence is reported of a saline spring water from Weardale, which compositionally closely resembles other saline waters derived from the Carnmenellis granite, southwest England. The total dissolved solutes achieve approximately 38 000 mg/L, and alkali geothermometers suggest equilibration temperatures of approximately 150°C, equivalent to a depth of 4 km. Using Na, K and Li it is possible to compare the composition of the spring water with those of other spring waters derived from Carboniferous sequences adjacent to the North Pennine Orefield and with published data for fluid inclusions from North Pennine fluorite. These compositional parameters suggest that the ancient mineralizing fluids resemble modern Carboniferous sediment-derived waters and contain a relatively minor component of granite-derived water. Data for Br and Cl indicate that a significant component of the present day Weardale spring waters was probably ultimately derived from organic-rich sedimentary sequences while data for K, Na and Li indicate the importance of a component derived from a permeable granite aquifer. The Weardale springwaters continue to have ‘mineralizing’ potential, in view of the possibility that they may have precipitated quartz or chalcedony during their ascent.

Parasites of round goby, Neogobius melanostomus, currently invading the Elbe River

2019 ◽  
Vol 48 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Yuriy Kvach ◽  
Markéta Ondračková ◽  
Michal Janáč ◽  
Vadym Krasnovyd ◽  
Mária Seifertová ◽  
...  
Keyword(s):  
Round Goby ◽  
Parasite Community ◽  
Neogobius Melanostomus ◽  
Published Data ◽  
Tidal Zone ◽  
New Host ◽  
The North ◽  
Round Gobies ◽  
The Elbe River ◽  
The One

Abstract The round goby, Neogobius melanostomus, is a Ponto-Caspian fish species currently found in many parts of Europe, including the North Sea riverine deltas. The objective of this study was to examine the parasite community of fish caught in the lower Elbe (Süderelbe – tidal zone; Geesthacht – non-tidal) in Germany and compare it with published data from the upper Elbe (Ústí nad Labem) in the Czech Republic. Twelve parasite taxa were recorded in the lower Elbe, six in the Süderelbe and nine near the city of Geesthacht. Süderelbe fish were mainly infected with Angullicola crassus larvae, while gobies from Geesthacht – with glochidia and sporadically occurring Pomporhynchus laevis, and the opposite situation was observed at Ústí nad Labem. It appears that a large tidal weir at Geesthacht significantly contributes to the division of the round goby population, with the Geesthacht parasite community being more similar to that at Ústí nad Labem than the one from the Süderelbe, thus increasing the likelihood that shipping from Hamburg was the introduction vector to Ústí nad Labem. We also recorded Acanthocephalus rhinensis in the Elbe for the first time, and in a new host – the round goby. Thus, round gobies may represent a new vector for the introduction of this parasite along the Elbe.

scholarly journals Geochemistry and tectonic significance of late Paleoproterozoic A-type granites along the southern margin of the North China Craton

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yan Wang ◽  
Yi-Zeng Yang ◽  
Wolfgang Siebel ◽  
He Zhang ◽  
Yuan-Shuo Zhang ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Published Data ◽  
Pb Isotope ◽  
Granite Sample ◽  
The North ◽  
Southern Margin ◽  
Basement Rocks ◽  
Type Granite ◽  
Melting Product

AbstractThe Longwangzhuang pluton is a typical example of Paleoproterozoic A-type granite intrusions at the southern margin of the North China Craton. This pluton is composed of arfvedsonite granite and minor aegirine–augite granites. Samples from both granite types display similar zircon U-Pb ages with 207U-206Pb ages of 1612 ± 19 Ma [mean square weighted deviation (MSWD) = 0.66] and 1609 ± 24 Ma (MSWD = 0.5), respectively. The granites exhibit similar high silica (SiO2 = 71.1–73.4 wt.%), high alkaline (Na2O + K2O = 8.10–9.26 wt.%, K2O/Na2O > 1), and low Al2O3 (11.8–12.8 wt. %) contents and metaluminous to weakly peraluminous bulk chemistry. The chemical variations of the Longwangzhuang pluton suggest the effects of mineral fractionation. In addition, all samples show typical characteristics of A-type granites, such as high 10000Ga/Al ratios (4.10–7.28), high FeOtot/(FeOtot + MgO) ratios (0.88–0.99), and high Zr (484–1082 ppm), Ce (201–560 ppm), and Y (78–156 ppm) contents. The εNd(t) values and the (206Pb/204Pb)t, (207Pb/204Pb)t, and (208Pb/204Pb)t ratios of the arfvedsonite granite samples vary from −4.6 to –5.3, 15.021 to 17.349, 15.241 to 15.472, and 33.206 to 36.905, respectively, and those for the aegirine–augite granite sample amount at −0.2, 14.421, 15.175, and 33.706. The distinct and variable Nd and Pb isotope values indicate the presence of heterogeneous protoliths. Based on its geochemistry, its low initial Pb isotope ratios, and its enrichment in Nd isotopes, we infer that the Longwangzhuang A-type granite is the partial melting product of basement rocks such as the Taihua Group gneisses accompanied by some involvement of juvenile material from the mantle. Together with published data from other Paleoproterozoic A-type granite plutons exposed at the southern margin of the craton, our findings suggest that these granites had a similar origin. Furthermore, geochemically, they can be divided into two groups: A2-type, which formed earlier (~1.8–1.6 Ga), and A1-type, which formed later (~1.6–1.5 Ga). Combining this information with the variations in whole-rock Nd and zircon Hf isotopic composition at ca. 1.6 Ga, we propose that tectonic transformation from post-orogenic to anorogenic magmatism occurred at the southern margin of the North China Craton at that time.

Interfacility Transfers for Isolated Craniomaxillofacial Trauma: Perspectives of the Facial Trauma Surgeon

2020 ◽  
pp. 194338752096227
Author(s):  
Matthew Pontell ◽  
Delora Mount ◽  
Jordan P. Steinberg ◽  
Donald Mackay ◽  
Michael Golinko ◽  
...  
Keyword(s):  
Statistical Significance ◽  
Outpatient Setting ◽  
Facial Trauma ◽  
Published Data ◽  
The North ◽  
Facial Plastic ◽  
Craniomaxillofacial Trauma ◽  
American Society ◽  
Transfer Services ◽  
Trauma Surgeons

Study Design: Secondary overtriage is a burden to the medical system. Unnecessary transfers overload trauma centers, occupy emergency transfer resources, and delay definitive patient care. Craniomaxillofacial (CMF) trauma, especially in isolation, is a frequent culprit. Objective: The aim of this study is to assess the perspectives of facial trauma surgeons regarding the interfacility transfer of patients with isolated CMF trauma. Methods: A 31-item survey was developed using Likert-type scale and open-ended response systems. Internal consistency testing among facial trauma surgeons yielded a Cronbach’s α calculation of .75. The survey was distributed anonymously to the American Society of Maxillofacial Surgeons, the North American Division of AO Craniomaxillofacial, and the American Academy of Facial Plastic and Reconstructive Surgery. Statistical significance in response plurality was determined by nonoverlapping 99.9% confidence intervals ( P < .001). Sum totals were reported as means with standard deviations and z scores with P values of less than .05 considered significant. Results: The survey yielded 196 responses. Seventy-seven percent of respondents did not believe that most isolated CMF transfers required emergency surgery and roughly half (49%) thought that most emergency transfers were unnecessary. Fifty-four percent of respondents agreed that most patients transferred could have been referred for outpatient management and 87% thought that transfer guidelines could help decrease unnecessary transfers. Twenty-seven percent of respondents had no pre-transfer communication with the referring facility. Perspectives on the transfer of specific fracture patterns and their presentations were also collected. Conclusion: Most facial trauma surgeons in this study believe that emergent transfer for isolated CMF trauma is frequently unnecessary. Such injuries rarely require emergent surgery and can frequently be managed in the outpatient setting without activating emergency transfer services. The fracture-specific data collected are a representation of the national, multidisciplinary opinion of facial trauma surgeons and correlate with previously published data on which specific types of facial fractures are most often transferred unnecessarily. The results of this study can serve as the foundation for interfacility transfer guidelines, which may provide a valuable resource in triaging transfers and decreasing associated health-care costs.

Prehistoric Llama Breeding and Herding on the North Coast of Peru

1985 ◽  
Vol 50 (1) ◽  
pp. 3-26 ◽  
Author(s):  
Melody Shimada ◽  
Izumi Shimada
Keyword(s):  
North Coast ◽  
Published Data ◽  
Body Parts ◽  
Middle Horizon ◽  
Clear Cut ◽  
The North ◽  
Wide Range ◽  
Early Horizon ◽  
Range Of Functions ◽  
North Coast Of Peru

There is no clear-cut consensus or reliable body of published data in the Andean literature indicating whether llamas were bred and herded on the prehistoric North Coast of Peru or periodically imported from the highlands. Based on four lines of evidence—ethnographic, archaeozoological, physiological, and ethnohistoric—we argue that llamas (and perhaps even alpacas) were successfully bred and maintained on the North Coast from the early Middle Horizon (ca. A.D. 600) and perhaps since the Early Horizon. More specifically, we discuss population structure, representation of body parts, climatic and dietary adaptability, and abundance of coastal forage. Both llamas and alpacas are physiologically well-adapted for the coastal environment and can efficiently process a wide range of forage. By the Middle Horizon, domestic camelids served a wide range of functions including transport, sacrifice, tools, and meat. Species identification, coastal herd management, effects of disease vectors, and other related issues are also discussed.

C4 grasses from the boreal forest region of northwestern Canada

1988 ◽  
Vol 66 (12) ◽  
pp. 2424-2430 ◽  
Author(s):  
A. G. Schwarz ◽  
R. E. Redmann
Keyword(s):  
Boreal Forest ◽  
High Irradiance ◽  
Published Data ◽  
Kranz Anatomy ◽  
The North ◽  
Forest Region ◽  
Geothermal Activity ◽  
The Mean ◽  
Distichlis Stricta ◽  
Boreal Climate

Six C4 grasses (Distichlis stricta, Muhlenbergia glomerata var. cinnoides, M. mexicana, M. richardsonis, Spartina gracilis, S. pectinata) were found in grassy openings in the boreal forest of northwestern Canada. High carbon isotope ratios and Kranz anatomy confirmed that these northern populations are functionally C4 grasses. Muhlenbergia mexicana was assumed to be a C4 grass on the basis of published data. Recent collections of C4 plants tended to have more negative δ13C values than older collections from northern locations, which may reflect decreases in δ13C of atmospheric CO2 over time. In general, northern C4 species had lower δ13C values than those reported for their southern counterparts. The boreal climate in the north supports C4 species only where the mean minimum temperature for July is at least 7.5 °C. C4 grasses were found in microsites warmed by high irradiance or geothermal activity; many of the sites had saline substrates. Northern C4 populations are rare and unique in the boreal flora and deserve special protection.

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