Centennial to millennial variability of greenhouse climate across the mid-Cenomanian event
نویسندگان
چکیده
Abstract Centennial- to millennial-scale climate variations are often attributed solar forcing or internal system variability, but recognition of such in the deep-time paleoclimate record is extremely rare. We present an exceptionally well-preserved, millimeter-scale laminated marlstone from a succession precession-driven limestone-marlstone couplets deposited Western Interior Seaway (North America) immediately preceding and during Cretaceous mid-Cenomanian event (ca. 96.5 Ma). Sedimentological, geochemical, micropaleontological data indicate that individual pairs light-dark laminae alternations extent water-column mixing oxygenation. Principal component analysis X-ray fluorescence element counts grayscale scan continuous thin section through reveal with 80–100 yr, 200–230 350–500 ?1650 4843 yr periodicities. A substantial fraction indicates anoxic bottom water variation pronounced 10,784 cycle. The centennial millennial reminiscent those found Holocene total irradiance anoxia cycle may be manifestation semi-precession-influenced Tethyan oxygen minimum zone waters entering seaway.
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ژورنال
عنوان ژورنال: Geology
سال: 2021
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g48734.1