How are diamictites dated?
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Diamictites are dated using various methods such as U-Pb dating of detrital zircons found within the rocks. For instance, Late Ordovician diamictites in Turkey were dated using U-Pb dating of granitic pebbles, providing ages ranging from 576.5 to 964.6 Ma . Additionally, the youngest 206Pb/238U ages in diamictites from different regions were used to determine the age of detrital zircons transported mainly from the northern margin of Gondwana . Furthermore, the absence of enrichments in siderophile elements like Ir in South African diamictites suggests no impact origin, as these elements are typically abundant in meteorites but not in terrestrial rocks . These dating methods help establish the age and origin of diamictites in geological records.
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11 Citations | Diamictites can be dated using methods like γ-γ coincidence spectrometry to study possible meteoritical components, as done in the research on South African diamictites. |
13 Citations | Diamictites are dated using Laser Ablation Inductively Coupled Plasma Mass Spectrometry U-Pb dating of detrital zircons, revealing ages of 499.1-562.5 Ma, indicating provenance from Gondwana's northern margin. |
| Diamictites can be dated by associating them with specific impact events, such as the Ries (ca. 14.9 Ma) meteorite impact, through the identification of impact-related features like shocked quartz grains. | |
| Diamictites are dated using methods like radiometric dating of associated volcanic rocks or by correlating with other dated rock layers, providing insights into their formation during specific geological time periods. | |
Open access•Dissertation 01 Nov 2017 4 Citations | Diamictites are dated based on the Neoproterozoic period (c. 720-635 Ma) using stratigraphic analysis within rift basins, indicating tectonic controls rather than climatic influences. |
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