High resolution sedimentological and geotechnical characterization of the Late Quaternary deposits in the Italian central Adriatic coast (Tronto River mouth)

2017 ◽  
Vol 220 ◽  
pp. 219-233 ◽  
Author(s):  
Pietro Vittorio Curzi ◽  
Laura Tonni ◽  
Guido Gottardi ◽  
Emanuele Mandanici
Keyword(s):  
High Resolution ◽  
Late Quaternary ◽  
River Mouth ◽  
Quaternary Deposits ◽  
Geotechnical Characterization ◽  
Adriatic Coast

The value of pocket penetration tests for the high-resolution palaeosol stratigraphy of late Quaternary deposits

2014 ◽  
Vol 50 (5) ◽  
pp. 670-682 ◽  
Author(s):  
Alessandro Amorosi ◽  
Luigi Bruno ◽  
Bruno Campo ◽  
Agnese Morelli
Keyword(s):  
High Resolution ◽  
Late Quaternary ◽  
Quaternary Deposits ◽  
Penetration Tests

High-resolution seismic stratigraphy of late Quaternary deposits in Manitounouk Sound, northern Quebec: effects of rapid postglacial emergence

1999 ◽  
Vol 36 (4) ◽  
pp. 549-563 ◽  
Author(s):  
Philip R Hill ◽  
Annie Simard ◽  
Arnaud Héquette
Keyword(s):  
High Resolution ◽  
Late Quaternary ◽  
Seismic Stratigraphy ◽  
Gravity Flow ◽  
Hudson Bay ◽  
Earthquake Activity ◽  
Stress Release ◽  
Quaternary Deposits ◽  
Marine Deposits ◽  
Slide Scar

Manitounouk Sound contains a succession of postglacial deposits consisting of three acoustic units separated by disconformities. From base to top, these are (1) a stratified draped unit interpreted as of glaciolacustrine and glaciomarine origin, (2) an onlapping basin-fill unit of thick transparent beds interpreted as gravity-flow deposits, and (3) a divergent fill unit of stratified and transparent modern marine deposits. The gravity-flow deposits of unit 2 pass laterally into slide scars that truncate unit 1. Pollen and dinoflagellate analysis of cores correlated with the acoustic sections indicate that unit 1 is of early Holocene age and confirms a glaciomarine environment. Unit 3 contains modern assemblages of pollen and dinoflagellates. The slide scar and gravity-flow deposits of unit 2 correspond to the period of transition from glaciomarine to modern conditions and are interpreted to result from a period of relatively intense earthquake activity due to stress release along faults during or shortly after the deglaciation of Hudson Bay.

scholarly journals Geophysical characterization of late-Quaternary glaciofluvial complex and glacial stratigraphy in the Satakunta sandstone area, Köyliö, southwest Finland

2020 ◽  
pp. 1-19
Author(s):  
Elina Marita Ahokangas ◽  
Georgiana Anca Maries ◽  
Joni Kalevi Mäkinen ◽  
Antti Heikki Pasanen ◽  
Alireza Malehmir ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Late Quaternary ◽  
Basement Rock ◽  
Quaternary Sediments ◽  
Reflection Seismic ◽  
Architectural Elements ◽  
Seismic Images ◽  
Geophysical Characterization

Abstract We acquired high-resolution reflection seismic data using a broadband digital-based landstreamer system to characterize a depression related to the Mesoproterozoic (Jothnian) Satakunta sandstone basin in the Köyliö study area, southwest Finland. This ca. 800-m-wide depression is infilled with up to 100-m-thick (late) Quaternary interlobate glaciofluvial complex sediments. The seismic images clearly reveal details of the glaciofluvial complex, sandstone depression topography, and brittle structures related to the formation of the sandstone basin by oblique transtension. Additionally, we identified the setting of a diabase laccolith within the sandstone and the geometry and position of the steep sandstone contact. The esker core does not follow the sandstone-Svecofennian basement rock contact or lean to it. The esker core is at a depth of 50–60 m on the flank of the depression. The seismic data image the esker core and other architectural elements of the esker. We highlight the potential of the digital-based landstreamer in the research of complex Quaternary sediments in major bedrock depressions including the characterization of the underlying bedrock properties. We also discuss the possible tunnel valley origin of the sandstone depression.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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