نتایج جستجو برای: chronostratigraphy

تعداد نتایج: 210  

Journal: :Journal of Micropalaeontology 2021

Abstract. During the Late Pleistocene–Holocene, Ross Sea Ice Shelf exhibited strong spatial variability in relation to atmospheric and oceanographic climatic variations. Despite being thoroughly investigated, timing of ice sheet retreat from outer continental shelf since Last Glacial Maximum (LGM) still remains controversial, mainly due a lack sediment cores with robust chronostratigraphy. For ...

Journal: :Quaternary Science Reviews 2022

The resilience of Neanderthals towards changing climatic and environmental conditions, especially severely cold climates in northern regions central Europe, is still under debate. One way to address this investigate multi-layered occupation different intervals, using independently-compiled paleoenvironmental chronological data. Unfortunately, most open-air sites on the European Plain lack a rob...

Journal: :Frontiers in Earth Science 2022

Emerging evidence suggests that U-Pb and Lu-Hf ages of sedimentary apatite group minerals are often younger than their biostratigraphic ages. However, dating exquisitely preserved carbonate fluorapatite (CFA) is rare. The Upper Cretaceous/Paleogene marine rocks the Moroccan High Atlas host phosphate-rich sediments bracketed by calcareous nannofossil Zones (NP4-NP9) late Danian to Thanetian age....

2013
A. Alexander G. Webb Chandra S. Dubey

Models for the origin and deformation of Himalayan rocks are dependent upon geometric and age relationships between major units. We present fi eld mapping and U-Pb dating of igneous and detrital zircons that establish the lithostratigraphic architecture of the eastern Himalaya, revealing that: (1) the South Tibet detachment along the BhutanChina border is a top-to-the-north ductile shear zone; ...

Journal: :Geochronology 2023

Abstract. Estimations of the reproducibility U–Pb ages from SHRIMP (Sensitive High-Resolution Ion MicroProbe) instruments are based on data studies that nearly 2 decades old. Since time, refinement analytical procedures and operational improvements have reduced historically identified uncertainties analysis. This paper investigates 36 thermal ionisation mass spectrometry (TIMS) double-dated “re...

Journal: :Eiszeitalter und Gegenwart 2022

Abstract. This study investigates the surroundings of Munigua (municipium Flavium Muniguense), a small Roman town in ancient province Hispania Baetica (SW Spain). The city's economy was based primarily on copper and iron mining, which brought financial prosperity to its citizens. Local production agricultural goods is thought have been little importance, as regional soil conditions do not seem ...

2003
K. Lepper

Introduction: Martian surface deposits, including polar deposits, represent a vast storehouse of data recording the evolution of Mars’ climate and surface environment. However, the greatest challenge to deciphering these martian geo-records is the need for absolute dating techniques [1], particularly those techniques applicable to the timeframes and surface processes of the “Martian Quaternary”...

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