Fine-grained interplanetary dust input during the Turonian (Late Cretaceous): evidence from osmium isotope and platinum group elements.

ABSTRACT: The Turonian age (~ 90-94 Ma) was the hottest geological interval in the Cretaceous and also marked by the K3 event, a pronounced enrichment of ³He in pelagic sediments (i.e., massive input of extraterrestrial materials). Here, we present Os isotopic (¹⁸⁷Os/¹⁸⁸Os) and platinum group element (PGE) data from Turonian sedimentary records. After a sharp unradiogenic shift during the end-Cenomanian oceanic anoxic event 2, the ¹⁸⁷Os/¹⁸⁸Os ratios declined continuously throughout the Turonian, which could be ascribed to the formations of several large igneous provinces (LIPs). Because the interval with the most unradiogenic ¹⁸⁷Os/¹⁸⁸Os ratios (i.e., enhanced LIP volcanism) does not correspond to the warmest interval durin

SUBMITTER: Matsumoto H 

PROVIDER: S-EPMC10716400 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature