نتایج جستجو برای: magnetostratigraphy

تعداد نتایج: 280  

Journal: :Earth and Planetary Science Letters 2022

A detailed magnetostratigraphic study, linked to a new latest Permian U–Pb ID-TIMS age, was undertaken on the continental Shichuanhe section (SCH) in North China order provide magnetic polarity scale for Late Permian–early Middle Triassic interval. Tilt-corrected mean directions of characteristic remanent magnetization pass reversal test and correspond site paleolatitude 18.1°N during Early Tri...

Journal: :Geophysical Research Letters 2022

Palaeogene environmental evolution in East Asia remains ambiguous. Here we present integrative work including magnetostratigraphy, grain-size, geochemistry, and clay mineralalogy from a 1609 m-thick fluviolacustrine sequence eastern China. The results reveal two periods of tectonic control alternating with three climatic on the sedimentary evolution. Tectonic activity study area, as revealed by...

Journal: :Geochronometria 2021

Abstract Establishing a chronology of events is critical step in reconstructing the palaeoclimate and it important for all types environmental records, including speleothems. Here, we analysed unique series flowstones deposited between 3.2 Ma (marine isotope stage (MIS) Km 3 ) 0.08 (MIS 5). The studied are located classic karstic environment, Ra?iška Pe?ina Cave south-western Slovenia. Further,...

Journal: :Journal of human evolution 2015
Christopher J Lepre Dennis V Kent

A magnetostratigraphy for ∼ 60 m of Koobi Fora Formation sediment in Area 104 was derived from 46 oriented samples that produced well-resolved characteristic magnetizations from progressive thermal demagnetization. Approximately 59 m below the Morte Tuff, previously dated to ∼ 1.51 Ma (millions of years ago), the Olduvai-Matuyama boundary (∼ 1.78 Ma) was found to be at the level of marker bed A...

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