نتایج جستجو برای: chronostratigraphy

تعداد نتایج: 210  

Journal: :The Cryosphere 2022

Abstract. In blue-ice areas (BIAs), deep ice is directly exposed at the surface, allowing for cost-effective collection of large-sized old-ice samples. However, chronostratigraphic studies on are challenging owing to fold and fault structures. Here, we report a surface transect with an undisturbed horizontal stratigraphy from Larsen BIA, northern Victoria Land, East Antarctica. Ice layers defin...

Journal: :Palaeogeography, Palaeoclimatology, Palaeoecology 2021

The Olduvai Gorge Coring Project drilled a total of 611.72 m core (575.48 recovered) mostly fluvio-lacustrine and fan-delta volcaniclastic Pleistocene strata at three sites in the Basin, Tanzania, 2014. We have developed chronostratigraphic framework for cores based on 40Ar/39Ar dating outcrop volcanic units, paleomagnetic stratigraphy, tephrochemical correlation between from to outcrop. This i...

2008
Chih-Wei Chen Kuo-Yen Wei Horng-Sheng Mii Tien-Nan Yang

A detailed oxygen isotope time-scale based on planktonic foraminifera Globigerinoides sacculifer at site MD012380 in the Banda Sea was established for the past 820 kyrs by correlating the record to the astronomically tuned benthic oxygen isotope chronology of MD972143. Ages for marine isotope stratigraphic (MIS) events from 2.0 back to 21.1 were designated for this western tropical Pacific reco...

Journal: :Quaternary Geochronology 2021

Paleomagnetism is a powerful tool for establishing an almost continuous chronostratigraphy entire region. When combined with other dating methods, absolute or relative, it can be used to develop regional reference chronostratigraphic framework. During the summer of 2016, several piston cores were collected along Atlantic side Lesser Antilles onboard R/V Pourquoi pas? as part CASEIS Expedition. ...

Journal: :Geoscience frontiers 2022

The Late Paleozoic–Early Mesozoic Mongol-Okhotsk Ocean extended between the Siberian and Amur–North China continents. timing modalities of oceanic closure are widely discussed. It is largely accepted that ocean closed in a scissor-like manner from southwest to northeast (in modern coordinates), though this process remains uncertain. Recent studies have shown both western (West Transbaikalia) ea...

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