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48 results for “Back arc”
FIGURE 9 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 9. SEM views of specimens 2 (a,c) and 4 (b, d–f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d).
FIGURE 6 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp.2 to sp.6 (a) are laid flat. Byssal notch of sp.6 is hidden in (a); in (b) sp.6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole.
FIGURE 3 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 3. Parameters measured on shell of Sinepecten segonzaci n. gen., n. sp. a: view of bivalve shell from the right side; b: sagittal section trough bivalve shell; c: anterior auricle and byssal notch of the right valve. Interior surface of the left valve stippled. Arrow on (b) indicating hinge axis. APD: anteriorposterior diameter; DBN: depth of byssal notch; HAA: height of anterior auricle; LAA: length of anterior auricle: LV left valve; MC: maximal convexity; RV: right valve; TLA: total length of auricles; UPD: umbonopallial diameter (linear height).
FIGURE 8 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows).
FIGURE 2 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 2. Morphological characters of juvenile shell (prismatic stage) of Sinepecten segonzaci n. gen., n. sp. External view of left (a) and right (c) valves, with sagittal section (b) through bivalve shell. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus; cr: commarginal ridge; di: disk; lv: left valve; ma: marginal apron; pa: posterior auricle; rv: right valve; u: umbo; A: anterior side; D: dorsal side; P: posterior side; V: ventral side. Arrow on (b) indicating hinge axis.
FIGURE 14 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 14. Biogeographical distribution of species belonging to Bathypecten, Catillopecten and Sinepecten. Stars indicate hydrothermal vent species. 1: B. eucymatus; 2: B. knudseni; 3: B. vulcani; 4: B. micaceus; 5: B. translucens; 6: C. graui; 7: C. murrayi; 8: C. sp.; 9: S. segonzaci.
FIGURE 4 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text).
FIGURE 5 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2–4) and in the largest adult specimen (sp. 6), i.e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve.
FIGURE 7 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp.2.
FIGURE 1 in A new species of the genus Phymorhynchus (Neogastropoda: Raphitomidae) from a hydrothermal vent in the Manus Back-Arc Basin
FIGURE 1. Phymorhynchus oculatus sp. nov. A–C. Ventral, lateral and dorsal view of holotype, respectively, 16.0 mm; D. Ventral view of paratype, 16.6 mm; E. Illustration of dorsal view of soft parts; F. Radular teeth, scale bar=100 µm. Abbreviations. (ct) cephalic tentacle; (dg) digestive gland; (e) eye; (f) foot; (gi) gill; (os) osphradium; (p) penis; (pm) pallial margin; (te) testis
Supporting data files for the manuscript titled "Wide versus narrow back-arc rifting: control of subduction velocity and convective back-arc thinning"
<p>This depository consists of the following numerical modelling output fields: materials (mat), viscosity (mu), temperature (t), coordinates (x, y), velocity (vx, vy) and time-step specific data required for visualization (loop)<br> The four sets of .mat (matlab-specific format) output files correspond to the four numerical modeling experiments presented in the manuscript titled Wide versus narrow back-arc rifting: control of subduction velocity and convective back-arc thinning by Zoltán Erdős, Ritske S. Huismans and Claudio Faccenna currently under revision at the journal Tectonics.<br> The modelling experiments were run with the 2D Arbitrary Lagrangean-Eulerean Finite Element geodynamic numerical code Fantom.<br> For ease-of-use we provide a simple matlab-script specifically designed to read-in and visualize the output data files.</p>
FIGURE 3 in Levensteiniella manusensis sp. nov., a new polychaete species (Annelida: Polynoidae) from deep-sea hydrothermal vents in the Manus Back-Arc Basin, Western Pacific
FIGURE 3. Levensteiniella manusensis sp. nov., detailed structures of the holotype (A–D, G–J) and paratypes (E, MBM285998; F, MBM285999; K, L, MBM285997). A, B, Head and anterior segments, in dorsal and ventral views, right palp detached; C, D, Lateral sides of segments 11–14 in ventral views, arrows point to the dichotomous branches in the first pair of ventral papillae; E, Extended pharynx in dorsal view; F, Posterior segments in ventral view; G, Left 1st elytron from segment 2; H, Left 2nd elytron from segment 4; I, Left 3rd elytron from segment 5; J, Elytron from posterior segment; K, Elytron from anterior segment; L, Elytron from posterior segment. Abbreviation: S1 referring to segment 1, and so on. Scale bars: 1 mm (A– D, K, L), 0.5 mm (E, F) and 2 mm (G–J).
FIGURE 4 in Levensteiniella manusensis sp. nov., a new polychaete species (Annelida: Polynoidae) from deep-sea hydrothermal vents in the Manus Back-Arc Basin, Western Pacific
FIGURE 4. Levensteiniella manusensis sp. nov., parapodia and chaetae of the holotype (A–D, G) and paratype (E, F, H–J, right 9 parapodium, MBM285999). A–D, Four parapodia in anterior (upper positions) and posterior (lower positions) views (A, Right 1st parapodium; B, Right 9th parapodium; C, Right 18th parapodium; D, Left last parapodium); E, Upper notochaetae; F, Lower notochaetae; G, Notochaetae; H, Subacicular neurochaetae; I, Same, showing details of proximal spinous region; J, Supra-acicular neurochaetae, showing details of distal (upper position) and proximal (lower position) spinous regions. Abbreviation: S2 referring to segment 2, and so on. Scale bars: 0.5 mm (A, D), 1 mm (B, C), 100 µm (E–H) and 10 µm (I, J).
FIGURE 1 in Levensteiniella manusensis sp. nov., a new polychaete species (Annelida: Polynoidae) from deep-sea hydrothermal vents in the Manus Back-Arc Basin, Western Pacific
FIGURE 1. Distribution of six species of Levensteiniella described to date based on present study and those of Pettibone (1985, 1988, 1989a, b, 1990) and Hourdez & Desbruyères (2000, 2003).
FIGURE 2 in Levensteiniella manusensis sp. nov., a new polychaete species (Annelida: Polynoidae) from deep-sea hydrothermal vents in the Manus Back-Arc Basin, Western Pacific
FIGURE 2. Levensteiniella manusensis sp. nov. in dorsal (A, C, E, G, I) and ventral (B, D, F, H, J) views. A, B, Holotype in vivo (MBM285996); C, D, Holotype preserved in alcohol; E, F, Paratype (MBM285999); G, H, The other paratype (MBM285999); I, J, Paratype (MBM286000). Scale bars: 5 mm (A, B) and (E–J).
Correlation between Back-arc Spreading Center and Volcanic Arc Location
<p>The dataset includes the measurements of individual subduction zones defined in the convergence-parallel, trench-perpendicular, and spreading-parallel direction. </p> <p> </p> <p>Table B.3. Location of each trench, arc, and back-arc defined in the convergence-parallel direction, and the corresponding distance from the trench to the arc (D_TA), from the arc to the back-arc spreading center (D_AB), and from the trench to the back-arc spreading center (D_TB). </p> <p>Table B.4. Location of each trench, arc, and back-arc defined in the trench-perpendicular direction, and the corresponding distance from the trench to the arc (D_TA), from the arc to the back-arc spreading center (D_AB), and from the trench to the back-arc spreading center (D_TB).</p> <p>Table B.5. Location of each trench, arc, and back-arc defined in the spreading-parallel direction, and the corresponding distance from the trench to the arc (D_TA), from the arc to the back-arc spreading center (D_AB), and from the trench to the back-arc spreading center (D_TB). </p> <p>TableS1. Location of each trench, arc, and back-arc defined in the convergence-parallel direction, and the corresponding distance from the trench to the arc (D_TA), subarc slab depth (H), and from the trench to the back-arc spreading center (D_TB). The slab dip is measured at 50km (Dip50), 100km (Dip100), and 200km (Dip200) and averaged from 0 to 50 km (Dip050), 0 to 100km (Dip0100), 0 to 200km (Dip0200), and 50 to 200km (Dip50200). </p> <p>TableS2. Location of each trench, arc, and back-arc defined in the trench-perpendicular direction, and the corresponding distance from the trench to the arc (D_TA), subarc slab depth (H), and from the trench to the back-arc spreading center (D_TB). The slab dip is measured at 50km (Dip50), 100km (Dip100), and 200km (Dip200) and averaged from 0 to 50 km (Dip050), 0 to 100km (Dip0100), 0 to 200km (Dip0200), and 50 to 200km (Dip50200). </p> <p> </p>
Back-arc tectonics and plate reconstruction of the Philippine Sea-South China Sea region since the Eocene
<p>This repository contains GPlates plate reconstruction model, CitComS simulation original results and supplementary movies for "<strong>Back-arc tectonics and plate reconstruction of the Philippine Sea-South China Sea region since the Eocene</strong>" as below:</p> <p>1. Liu_etal_GRL_PS_SCS.zip</p> <p>2. Temperature_field_along_sections.zip</p> <p>3. Movie_S1_Plate_motion_since_55_Ma_with_oceanic_crust_age.mp4</p> <p>4. Movie_S2_Plate_motion_since_55_Ma.mp4</p>
Geometrical Relations between Slab Dip and the Location of Volcanic Arcs and Back-arc Spreading Centers
<p>The dataset includes the measurements of individual subduction zones defined in the convergence-parallel, trench-perpendicular, and spreading-parallel direction. </p> <p> </p> <p>Table S3. Location of each trench, arc, and back-arc defined in a direction parallel to the convergence, and the corresponding distance from the trench to the arc (D_TA), subarc slab depth (H), and from the trench to the back-arc spreading center (D_TB). The slab dip is measured at 50km (Dip50), 100km (Dip100), and 200km (Dip200) and averaged from 0 to 50 km (Dip050), 0 to 100km (Dip0100), 0 to 200km (Dip0200), and 50 to 200km (Dip50200). </p> <p>Table S4. Location of each trench, arc, and back-arc defined in a direction perpendicular to the trench, and the corresponding distance from the trench to the arc (D_TA), subarc slab depth (H), and from the trench to the back-arc spreading center (D_TB). The slab dip is measured at 50km (Dip50), 100km (Dip100), and 200km (Dip200) and averaged from 0 to 50 km (Dip050), 0 to 100km (Dip0100), 0 to 200km (Dip0200), and 50 to 200km (Dip50200). </p> <p>Table S5. Location of each trench, arc, and back-arc defined in a direction parallel to the spreading direction, and the corresponding distance from the trench to the arc (D_TA), subarc slab depth (H), and from the trench to the back-arc spreading center (D_TB). The slab dip is measured at 50km (Dip50), 100km (Dip100), and 200km (Dip200) and averaged from 0 to 50 km (Dip050), 0 to 100km (Dip0100), 0 to 200km (Dip0200), and 50 to 200km (Dip50200). </p> <p> </p>
A preliminary framework for magmatism in modern continental back-arc basins and its application to the Triassic-Jurassic tectonic evolution of the Caucasus
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Data from: Ocean circulation contributes to genetic connectivity of limpet populations at deep-sea hydrothermal vents in a back-arc basin
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