Results 101 to 110 of about 3,413,444 (233)

Uniformity of the upper Famennian Milankovitch cycle in China

open access: yesChinese Science Bulletin, 2000
Research on chemo-biostratigraphy reveals that the periodic fluctuation of Ce/La ratios in carbonate sequence may reflect Milankovitch 100 ka eccentricity cyclicity. The Ce/La curve of the upper Famennian of Huangmao (Guangxi) may be well correlated to that of Muhua (Guizhou) and of Mid-Tarim (Xinjiang).
Weicheng Hao   +2 more
openaire   +1 more source

Damping of glacial-interglacial cycles from anthropogenic forcing

open access: yes, 2014
Climate variability over the past million years shows a strong glacial-interglacial cycle of ~100,000 years as a combined result of Milankovitch orbital forcing and climatic resonance.
Haqq-Misra, Jacob
core   +1 more source

Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: A case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China

open access: yesPetroleum Exploration and Development, 2018
Taking organic-rich shale in the first member of Cretaceous Qingshankou Formation in the Gulong Sag, northern Songliao Basin as an example, this study examined the lithofacies classification, petrological characteristics, pore size distribution and their
Bo LIU   +6 more
doaj   +1 more source

The orbital record in stratigraphy [PDF]

open access: yes
Orbital signals are being discovered in pre-Pleistocene sediments. Due to their hierarchical nature these cycle patterns are complex, and the imprecision of geochronology generally makes the assignment of stratigraphic cycles to specific orbital cycles ...
Fischer, Alfred G.
core   +1 more source

Nonlinearity and Multifractality of Climate Change in the Past 420,000 Years

open access: yes, 2002
Evidence of past climate variations are stored in ice and indicate glacial-interglacial cycles characterized by three dominant time periods of 20kyr, 40kyr, and 100kyr.
Ashkenazy   +29 more
core   +1 more source

Late Quaternary record of 100 ka depositional cycles on the Larache shelf (NW Morocco)

open access: yesOpen Geosciences
This study examines the stratigraphic architecture of the Upper Pleistocene on the Larache margin, NW Moroccan Atlantic, focusing on the impact of glacio-eustatic cycles. Utilizing seismic analysis, we identified four major seismic sequences (UD, UC, UB,
Raki Amine, Jemily Linda, Mhammdi Nadia
doaj   +1 more source

Research Status and Development Direction of Well Log Cyclostratigraphy

open access: yesCejing jishu
Well log cyclostratigraphy has become the foundation for studying many key scientific issues in the field of geosciences by identifying, extracting, and interpreting astronomical cycles recorded by geophysical logs. This paper analyzes the driving forces
PENG Cheng, ZOU Changchun, CAO Jinyu
doaj   +1 more source

Would Adding the Anthropocene to the Geologic Time Scale Matter?

open access: yesAGU Advances
Abrupt planetary change forced by the cumulative and overwhelming impacts of human activities in the mid‐twentieth century supports a new geologic epoch, named after Anthropos, the agent of this change.
Francine M. G. McCarthy   +3 more
doaj   +1 more source

Integrated bio- and cyclostratigraphy of Middle Triassic (Anisian) ramp deposits, NW Bulgaria

open access: yesGeologica Carpathica, 2019
A cyclostratigraphic interpretation of peritidal to shallow-marine ramp deposits of the early Middle Triassic (Anisian) Opletnya Member exposed in outcrops along the Iskar River gorge, NW Bulgaria, is presented.
Ajdanlijsky George   +2 more
doaj   +1 more source

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