2,036 research outputs found
Effect of palaeomorphology on facies distribution of the Campania Ignimbrite in the northern Campania Plain, southern Italy
No full textThe Campania Ignimbrite eruption (CI – 39 ka) is of the most explosive super-eruptions of the last 200 ka in Europe, that generated about 250-300 km3 of ignimbrite deposit venting from fissural faults of the Campania Plain, southern Italy. The pyroclastic deposits associated to this event show different lithofacies from the vent to the medial-distal part reflecting changing in style of deposition and/or palaeo-environmental setting. Based on some 1000 stratigraphic well logs and previous studies, a qualitative restoration was made of the morphology of the Campania Plain, prior to the CI eruption. According to our interpretation, from the proximal area towards NNW, four main palaeogeographic domains can be recognized, which conditioned the medial/distal distribution of the CI lithofacies and their depositional and early diagenetic environments across the plain
Ptisana rolandi-principis Christenh.
No full textPtisana rolandi-principis (Rosenst.) Christenh.: New Caledonia. Plateau de Dogny, 26.IX.2016, Perrie et al. 7694 (WELT P028627), GenBank: OM296024, OM296031.Published as part of Shepherd, Lara D., Murdock, Andrew G., Amice, Rémy & Perrie, Leon R., 2023, A synopsis of Ptisana Murdock ferns (Marattiaceae) in New Caledonia based on sequence data and morphology with the recognition of a new vulnerable species, P. soluta (Compton) Murdock & Perrie, comb. nov., stat. nov., pp. 41-59 in Adansonia (3) (3) 45 (3) on page 57, DOI: 10.5252/adansonia2023v45a3, http://zenodo.org/record/766506
Contribution on the geological and volcanological aspects of Monte di Vezzi (Ischia Island, Italy) to study landslide events of April 2006.
No full textA Measurement of the Space-Like Pion Electromagnetic Form-Factor
No full textThe pion form factor has been measured in the space-like q 2 region 0.014 to 0.26 (GeV/ c ) 2 by scattering 300 GeV pions from the electrons of a liquid hydrogen target. A detailed description is given of the apparatus, data analysis and corrections to the data. The mean square charge radius extracted from the data is model-dependent. We find that a form which includes a realistic description of the form factor phase gives a similar results to the naive pole form, and conclude 〈r 2 π 〉 = 0.438±0.008 fm 2
Major, trace element and isotope geochemistry (Sr-Nd-Pb) of interplinian magmas from Mt. Somma-Vesuvius (Southern Italy)
No full textGoniocotes rolandi Gustafsson & Tian & Zou 2021, new species
No full textGoniocotes rolandi new species (Figs 10–11, 13–15) Type host: Crossoptilon harmani Elwes, 1881 —Tibetan eared pheasant (Phasianidae). Type locality: Southeast Tibet, China. Diagnosis. Goniocotes rolandi new species is most similar to Goniocotes crossoptiloni Liu, 1990. These two species can be separated by the following characters: male tergopleurites V–VI with 1 tps on each side and tergopleurite VII without tps in G. crossoptiloni, but tergopleurite V with 2–4 tps on each side, tergopleurite VI with 1–2 tps on each side, and tergopleurite VII with 1–2 tps on each side in G. rolandi (Fig. 10); male sternite IV–V with 2 sts on each side in G. crossoptiloni, but with 3–4 sts on each side in G. rolandi (Fig. 10); head of G. rolandi (Figs 10–11) proportionately wider and with flatter frons, especially in female, than head of G. crossoptiloni; vulval margins more or less gently rounded in G. crossoptiloni, but with pronounced median bulge in G. rolandi (Fig. 13); male genitalia not illustrated in sufficient detail for G. crossoptiloni, but appear to have shorter parameres and broader mesosome than those of G. rolandi (Figs 14–15). Description. Both sexes. Head shape as in Fig. 10; temples flaring with definite postero-lateral corner at aperture of mts1. Marginal carina of moderate width, widening anteriorly (more obvious in male). Head chaetotaxy as in Figs 10–11; os sexually dimorphic; s1–2 and s5–9 present, as well as one sensillum situated roughly on a line between pts and pns, which may be either of s3–4. Thoracic and abdominal segments as in Figs 10–11. Reticulation covers almost all of tergal and subgenital plates, but is less distinct elsewhere. For clarity, we have here illustrated only parts of this reticulation in grey, to indicate the relative size of the cells in the pattern. Measurements as in Table 1. Male. Ocular seta macroseta (Fig. 10). Thoracic and abdominal chaetotaxy as in Fig. 10; median section of pteronotum with one macroseta and one microseta on each side; tergopleurites II–IV with setal rows; tergopleurite V with 2–4 tps on each side; tergopleurite VI with 1–2 tps on each side (one specimen with no tps on one side); tergopleurite VII with one tps on each side. Basal apodeme long and slender (Figs 14–15). Mesosome present, roughly triangular dorsally (Fig. 14), but ventrally with distinct hook-shaped lateral extensions at about mid-length. One small sensillum on each side near the dorsal anterior margin; no other sensilla or setae visible. Postero-lateral corners of basal apodeme with rugose nodi; parameres slender and somewhat elongated. Female. Ocular seta microseta (Fig. 11). Thoracic and abdominal segments and chaetotaxy as in Fig. 11. Vulval margin with distinct median bulge and lateral sections deeply concave (Fig. 13). Vulval chaetotaxy: 41–48 long, slender vms (often in double rows at least laterally) and 2–3 large, thorn-like vss on each side; oblique set with 5–8 vos of varying length on each side, typically with distal setae longer than more proximal setae. Etymology: The specific epithet is in honour of the first author’s father, Roland Gustafsson, who spent many weekends taking him outdoors to watch birds, to camp, to enjoy nature, and introducing him to his first bird-ringing event outside Jönköping, Sweden, in the early 1990s. This laid the foundations of a solid interest in nature for the first author, who eventually devoted his life to biological research. Type material. Ex Crossoptilon harmani: Holotype ♂, S.E. Tibet [China], May 1912, R. Meinertzhagen, ID 3759, NHMUK010675935 [right-most male on slide, marked with black dot] (NHMUK). Paratypes. 3♂, 6♀, same data as holotype, NHMUK010675934–5 (NHMUK).Published as part of Gustafsson, Daniel R., Tian, Chunpo & Zou, Fasheng, 2021, New species of ischnoceran chewing lice (Phthiraptera: Philopteridae) from Chinese birds, pp. 305-328 in Zootaxa 4990 (2) on pages 310-317, DOI: 10.11646/zootaxa.4990.2.6, http://zenodo.org/record/502655
Stratigraphic architecture of the Campania Plain, southern Italy. A key to understand evolution and impact of volcanic activity
No full text
Laena rolandi Schawaller, 2006, n. sp.
No full textLaena rolandi n. sp. (Figs 10, 24) Holotype (♂): N Thailand, Chiang Mai, Doi Pui, 1600–1685 m, 7.– 9.V. 2004, leg. R. Grimm, CRGT. Paratypes: N Thailand, Chiang Mai, Doi Suthep Pui NP, 30.V. 1999, leg. R. Grimm, 1 ex. CRGT. – N Thailand, Chiang Mai, Doi Pui, 1600–1685 m, 23.IV.– 12.V. 2003, leg. R. Grimm, 5 ex. CRGT, 2 ex. SMNS. Etymology: Dedicated to Dr. Roland Grimm (Tübingen), collector of the type series, for fruitful longterm cooperation. Diagnosis: Laena rolandi n. sp. and Laena thailandica Kaszab & Chûjô, 1966 (see photo 6 in Kaszab & Chûjô 1966) from southern Thailand share the small body size, unarmed legs and the glabrous surface, but can be separated by completely different shaped pronotum (round and widest in the middle in thailandica), dense nearly confluent pronotal punctation (sparse in thailandica), unbordered lateral pronotal margin (bordered in thailandica) and narrower elytral intervals. The aedeagus of Laena thailandica is unknown and so can not be compared. Description: Body length 3.8–5.0 mm. Eyes somewhat prominent. Pronotum (Fig. 10) with large punctures, distance between 0.5– 3 diameters, most punctures bearing short adpressed seta; surface flat, shining; lateral margin unbordered; propleura with sparser punctation, nearly without setation. Elytra (Fig. 10) with complete rows of punctures without striae, punctures equal in size to pronotal punctures, all without setae; intervals with very few scattered punctures, without setae, interval 9 with 3 distinct setiferous pores; all intervals slightly convex, shining. Femora in both sexes without distinct tooth or other modification. Tibiae in males without distinct sexual character. Aedeagus see Fig. 24.Published as part of Schawaller, Wolfgang, 2006, New species of the genus Laena Latreille (Coleoptera: Tenebrionidae) from Southeastern Asia *, pp. 369-384 in Zootaxa 1325 on pages 374-375, DOI: 10.5281/zenodo.17402
U-series disequilibria in young (A.D.1944) Vesuvius rocks : preliminary implications for magma residence times and volatile addition.
No full textThe results of a preliminary U-series study of the timescale of magmatic processes at Vesuvius are presented. Phonotephrites of the 1944 eruption of Vesuvius show 0–15% 230Th–238U and 350–1150% 226Ra–230Th disequilibria. Apparent U–Th internal isochrons for a lava and a cumulate nodule suggest crystal residence times of 12 and 39 ka, respectively. A tephra sample shows isotopic heterogeneity, possibly related to mixing of younger crystal-laden melt and older crystals giving apparent U–Th ages of 0.4 and 18 ka, respectively. Mineral 226Ra–230Th disequilibria on Ba-normalised internal isochron diagrams suggest Ra–Th ages of 1730–3300 years for the same rocks and phenocrysts. Minor 226Ra/230Th heterogeneity between minerals and groundmass (or whole rock) is evidence of open-system Ra–Th behaviour. This heterogeneity suggests that there have been recent, post-crystallisation changes in melt composition that affected 226Ra more than 230Th. Continued crystallisation in a Ra-enriched magma has subsequently resulted in Ra–Th disequilibria probably as a result of addition via a fluid-rich phase. Magma differentiation, residence time, transport, and pervasive gas addition at Vesuvius apparently occur over geologically short periods
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