Mineralogy of strata around the Eocene-Oligocene boundary at Site 573 in the East Pacific

Author(s): Yin Yanhong; Sun Jiashi; Qu Gaosheng
Author Affiliation(s): Primary:
Ministry of Land and Natural Resources, Institute of Marine Geology, Qingdao, China
Volume Title: Haiyang Dizhi yu Disiji Dizhi Marine Geology & Quaternary Geology
Source: Haiyang Dizhi yu Disiji Dizhi = Marine Geology & Quaternary Geology, 20(1), p.15-22. Publisher: Ministry of Geology and Mineral Resources, Marine Geology Institute and Quaternary Geology Research Center, Qingdao, China. ISSN: 0256-1492
Note: In Chinese with English summary. 13 refs.; illus., incl. 2 tables
Summary: The Eocene-Oligocene boundary shows a complex combination of 10 or more types of minerals such as quartz, cristobalite, barite, illite, apatite, clinoptilolite, phillipsite, montmorillonite, goethite and hornblende, and calcite is contained only at the top and bottom. Abundant Fe element and Fe-group elements such Ni, Co and Ir are contained in the layer. Microtektites are also found in the layer, especially in the bottom of it. This shows the formation of the metalliferous claystone may have some relationship with meteorite impact. Based on the mineral composition of the strata between the Eocene and early Oligocene, the distribution of microtektites, the extinction of many organisms, the fluctuations in calcite compensation depth, and so on, the authors infer that a catastrophic event from a meteorite impact may have occurred at the end of the Eocene.
Year of Publication: 2000
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Calcite; Carbonates; Cenozoic; DSDP Site 573; Deep Sea Drilling Project; East Pacific; Eocene; IPOD; Impacts; Leg 85; Lower Oligocene; Microtektites; Mineral assemblages; Mineral composition; Oligocene; Pacific Ocean; Paleogene; Stratigraphic boundary; Stratigraphy; Tektites; Tertiary; Upper Eocene
Coordinates: N002954 N002955 W1331834 W1331835
Record ID: 2003013543
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by National Geological Library, Beijing, China