Characterization of the loamy surficial sediments in a type area of the Iowan Erosion Surface

1983 ◽  
Author(s):  
Donald John Wysocki
Keyword(s):  
Surficial Sediments ◽  
Type Area ◽  
Erosion Surface

scholarly journals Geochemical and mineralogical characterization of surficial sediments from the Northern Rias: Implications for sediment provenance and impact of the source rocks

2012 ◽  
Vol 291-294 ◽  
pp. 63-72 ◽  
Author(s):  
Patricia Bernárdez ◽  
Ricardo Prego ◽  
Santiago Giralt ◽  
Jaume Esteve ◽  
Miguel Caetano ◽  
...  
Keyword(s):  
Source Rocks ◽  
Sediment Provenance ◽  
Surficial Sediments ◽  
Mineralogical Characterization

Foraminiferal biostratigraphy of the Visean–Serpukhovian (Mississippian) boundary interval at slope and platform sections in southern Guizhou (South China)

2012 ◽  
Vol 86 (5) ◽  
pp. 753-774 ◽  
Author(s):  
John R. Groves ◽  
Wang Yue ◽  
Qi Yuping ◽  
Barry C. Richards ◽  
Katsumi Ueno ◽  
...  
Keyword(s):  
Guizhou Province ◽  
Reference Area ◽  
Type Area ◽  
Slope Deposits ◽  
Central United States ◽  
Moscow Basin ◽  
Stratotype Section ◽  
Foraminiferal Biostratigraphy ◽  
Serpukhovian Stage

The Visean–Serpukhovian boundary is not yet defined by a Global Stratotype Section and Point (GSSP) but it is recognizable operationally by the appearance of the conodont Lochriea ziegleri in the L. nodosa–L. ziegleri chronocline. Foraminiferal successions across this boundary in the type area of the Serpukhovian Stage (Moscow Basin, Russia), elsewhere in Russia and in the central United States suggest that the appearances of Asteroarchaediscus postrugosus, Janischewskina delicata, Eolasiodiscus donbassicus, and specimens controversially referred to “Millerella tortula” are reliable, auxiliary indices to the base of the Serpukhovian. In southern Guizhou Province, China, Visean–Serpukhovian rock sequences from slope and platform settings have yielded rich associations of conodonts and foraminifers, respectively. The Nashui section is a leading candidate for the Serpukhovian GSSP because its slope deposits contain an uninterrupted record of conodont occurrences including the L. nodosa–L. ziegleri transition. Foraminifers recovered from the Nashui section are comparatively rare and include none of the basal Serpukhovian indices. In contrast, the nearby Yashui section represents a platform interior setting in which foraminifers flourished and conodonts were nearly absent. The base of the Serpukhovian at Yashui is marked approximately by the appearance of “tortula-like” specimens. Although it is not possible to correlate biostratigraphically between the Nashui and Yashui sections, the occurrence of “tortula-like” specimens at the Yashui section allows correlation with the mid-Venevian Substage of the Moscow Basin at a level coinciding with the appearance of L. ziegleri. Together, the slope and platform sections comprise an informative biostratigraphic reference area for micropaleontologic characterization of the Visean–Serpukhovian boundary in southern Guizhou.

scholarly journals Geochemical, Sedimentological and Mineralogical Characterization of Surficial Sediments in Eynak Marsh (North of Iran)

2016 ◽  
Vol 06 (07) ◽  
pp. 640-659 ◽  
Author(s):  
Ayda Hazermoshar ◽  
Razyeh Lak ◽  
Mohammad Reza Espahbood ◽  
Nader Kohansal Ghadimvand ◽  
Reza Farajzadeh
Keyword(s):  
Surficial Sediments ◽  
Mineralogical Characterization ◽  
North Of Iran

Geotechnical properties of two deep-sea marine soils from the Labrador Sea

1987 ◽  
Vol 24 (4) ◽  
pp. 536-548 ◽  
Author(s):  
Pierre Morin ◽  
C. Roy Dawe
Keyword(s):  
Deep Sea ◽  
Laboratory Testing ◽  
Soil Structure ◽  
Geotechnical Properties ◽  
Labrador Sea ◽  
Geological Data ◽  
Empirical Correlations ◽  
Surficial Sediments ◽  
X Ray

Cores from two deep-sea sites from the Labrador Sea have been extensively studied using various analyses. X-ray techniques provided a continuous profile of bulk densities and an accurate description of the bedding. The soil structure was analyzed by scanning electron microscopy. Detailed identification, laboratory shear strength, and compressibility tests have been used to determine the geotechnical properties of the soils, both in their intact and remolded states. Geological data and fabric observations are compared with geotechnical properties in order to explain the observed overconsolidation of the surficial sediments. Characterization of the seabed materials is further improved by using existing empirical correlations with soils of onshore and offshore origin. Key words: marine sediments, deep-sea investigation, overconsolidation, laboratory testing, offshore.

scholarly journals The stratigraphy of the Upper Greensand Formation (Albian, Cretaceous) of the Isle of Purbeck, Dorset, UK

2017 ◽  
Vol 67 (3) ◽  
pp. 405-424 ◽  
Author(s):  
Ramues Gallois ◽  
Hugh Owen
Keyword(s):  
Shallow Water ◽  
Full Thickness ◽  
Carbonate Cement ◽  
Type Area ◽  
Lateral Variations ◽  
Maximum Development ◽  
Erosion Surface

AbstractAt its maximum development in the type area on the Devon coast, the Upper Greensand Formation comprises up to 55 m of sandstones and calcarenites with laterally and stratigraphically variable amounts of carbonate cement, glauconite and chert that were deposited in fully marine, shallow-water environments. The formation is divided into three members, in ascending order the Foxmould, Whitecliff Chert and Bindon Sandstone, each of which is bounded by a prominent erosion surface that can be recognised throughout the western part of the Wessex Basin. The full thickness of the formation, up to 60 m, was formerly well exposed in cliffs in the Isle of Purbeck in the steeply dipping limb of the Purbeck Monocline. The upper part of the succession is highly condensed in comparison with the Devon succession and exhibits lateral variations over distances of hundreds of metres that are probably related to penecontemporaneous fault movements. Much of the fauna is not age-diagnostic with the result that the ages of parts of the succession are still poorly known. However, the Isle of Purbeck sections contain diverse ammonite faunas at a few stratigraphically well-defined levels that enable the succession to be correlated with that of east Devon and west Dorset.

Seismic and lithofacies characterization of a gravity core transect down the submarine Tuaheni Landslide Complex, NE New Zealand

2018 ◽  
Vol 477 (1) ◽  
pp. 479-495 ◽  
Author(s):  
Jannis Kuhlmann ◽  
Alan R. Orpin ◽  
Joshu J. Mountjoy ◽  
Gareth J. Crutchley ◽  
Stuart Henrys ◽  
...  
Keyword(s):  
New Zealand ◽  
Mass Transport ◽  
Source Area ◽  
Debris Avalanche ◽  
Gravity Core ◽  
Surficial Sediments ◽  
Near Surface ◽  
Shelf Sediments ◽  
Core Descriptions

AbstractThe southern Tuaheni Landslide Complex (TLC) at the Hikurangi subduction margin displays distinctive morphological features along its distribution over the Tuaheni slope offshore Gisborne, New Zealand. We here present first analyses of a gravity core transect that systematically samples surficial sediments from the source area to the toe of this landslide complex, thus providing important new insight into shallow lithological variation in the slide complex. Geophysical and geochemical core logs and core descriptions form the basis for a characterization of representative sediment successions that are indicative of the respective slope segment of recovery. Our results show that the lithology of surficial sediments varies significantly along the length of the landslide complex. Depending on the slope segment observed, this variation includes post-Last Glacial Maximum (LGM) outer-shelf sediments, and hemipelagic drape and near-surface reworked debris avalanche deposits, as well as multiple intercalated thinner turbidites and tephra layers at the distal end of the profile. Lithological downslope variability suggests ongoing mass transport events through the late Holocene that were likely to have been limited to small mud-turbidite flows. Integration with acoustic sub-bottom imagery reveals the presence of multiple stacked mass-transport deposits at depth, contrasting with previous interpretations of a single parent failure.

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