GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 554.3  (1)
  • AGE; Astrochronology; borehole logging data; Calculated, according to Kaboth-Bahr et al. (2024); DEPTH, sediment/rock; FB2001; Gamma ray; Gamma ray, normalized; Geochemical proxies; Hydraulic rotary drilling; Messel, Germany; middle Eocene; Spectral Gamma Ray (SGR), Antares  (1)
Document type
Keywords
Publisher
Language
Years
  • 1
    facet.materialart.
    Unknown
    Mega-monsoon variability during the late Triassic: Re-assessing the role of orbital forcing in the deposition of playa sediments in the Germanic Basin (2021)
    Details
    Publication Date: 2021-09-06
    Description: The formation of the supercontinent Pangaea during the Permo–Triassic gave rise to an extreme monsoonal climate (often termed ‘mega-monsoon’) that has been documented by numerous palaeo-records. However, considerable debate exists about the role of orbital forcing in causing humid intervals in an otherwise arid climate. To shed new light on the forcing of monsoonal variability in subtropical Pangaea, this study focuses on sediment facies and colour variability of playa and alluvial fan deposits in an outcrop from the late Carnian (ca 225 Ma) in the southern Germanic Basin, south-western Germany. The sediments were deposited against a background of increasingly arid conditions following the humid Carnian Pluvial Event (ca 234 to 232 Ma). The ca 2·4 Myr long sedimentary succession studied shows a tripartite long-term evolution, starting with a distal mud-flat facies deposited under arid conditions. This phase was followed by a highly variable playa-lake environment that documents more humid conditions and finally a regression of the playa-lake due to a return of arid conditions. The red–green (a*) and lightness (L*) records show that this long-term variability was overprinted by alternating wet/dry cycles driven by orbital precession and ca 405 kyr eccentricity, without significant influence of obliquity. The absence of obliquity in this record indicates that high-latitude forcing played only a minor role in the southern Germanic Basin during the late Carnian. This is different from the subsequent Norian when high-latitude signals became more pronounced, potentially related to the northward drift of the Germanic Basin. The recurring pattern of pluvial events during the late Triassic demonstrates that orbital forcing, in particular eccentricity, stimulated the occurrence and intensity of wet phases. It also highlights the possibility that the Carnian Pluvial Event, although most likely triggered by enhanced volcanic activity, may also have been modified by an orbital stimulus.
    Keywords: 551.762 ; 554.3 ; Carnian Pluvial Event ; Germanic Basin ; Late Triassic ; mega-monsoon ; orbital forcing ; playa-lake
    Language: English
    Type: article
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    CITATION GEO-LEO
  • 2
    facet.materialart.
    Unknown
    Gammy ray measurements from drillhole FB2001 located in Messel (Darmstadt) (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-25
    Description: The regularly spaced downhole gamma-ray log data (vertical sample rate = 0.1 m) from FB2001 located in Messel (Darmstadt) for the depth interval between 190 m to 1 m were already published in Felder and Harms (2004) and Wonik (2005). The gamma ray logging was done using a spectral gamma ray sensor (ANTARES). The normalized borehole gamma ray logging data from drill hole FB2001 was employed for astronomical tuning against the reference astronomical solution La2010d (Laskar et al., 2011, doi:10.1051/0004-6361/201116836).
    Keywords: AGE; Astrochronology; borehole logging data; Calculated, according to Kaboth-Bahr et al. (2024); DEPTH, sediment/rock; FB2001; Gamma ray; Gamma ray, normalized; Geochemical proxies; Hydraulic rotary drilling; Messel, Germany; middle Eocene; Spectral Gamma Ray (SGR), Antares
    Type: Dataset
    Format: text/tab-separated-values, 3782 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...