Major- and trace-element analyses of cherts, porcellanites, oozes, and clays from DSDP Sites 32-303 and 32-304 (Tables 1, 2)

DOI

Analyses of 42 Cretaceous rock samples from Deep Sea Drilling Project (DSDP) Leg 32, in the northern Pacific, show that chert and porcellanite are enriched in Fe, Mn, P, Cu, Ba, Mo, Ni and Pb relative to both Triassic biogenic cherts of central Japan and Cretaceous DSDP cherts of Leg 62. The iron enrichment (up to 6.68% Fe2O3, as total iron) is most prominent in chert immediately overlying basal basalt which is the only chert free of radiolarians and veined by megaquartz containing many fluid inclusions. Chemical features characterized by a low ratio for AI/(Al +Fe+Mn) and Al2O3/TiO2 and a high ratio for total - Fe2O3/TiO2 - MnO/TiO2 and Mo/TiO2, as well as petrological evidence, indicate that the cherts formed in an intense submarine hydrothermal environment on or near the Cretaceous Japanese spreading center which separated the Kula plate from the Pacific plate. The spreading rate of the Cretaceous Japanese spreading center estimated from the chemical composition of the cherts was about 3.7 cm/yr;the rate is comparable to that inferred from the geomagnetic data.

Supplement to: Adachi, Mamoru; Yamamoto, Koshi; Sugisaki, Ryuichi (1986): Hydrothermal chert and associated siliceous rocks from the northen Pacific: their geological significance as indicator of ocean ridge activity. Sedimentary Geology, 47(1-2), 125-148

Identifier
DOI https://doi.org/10.1594/PANGAEA.763463
Related Identifier https://doi.org/10.1016/0037-0738(86)90075-8
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.763463
Provenance
Creator Adachi, Mamoru; Yamamoto, Koshi ORCID logo; Sugisaki, Ryuichi
Publisher PANGAEA
Publication Year 1986
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 1908 data points
Discipline Earth System Research
Spatial Coverage (154.451W, 39.338S, 155.070E, 40.808N); North Pacific/BASIN
Temporal Coverage Begin 1973-08-18T00:00:00Z
Temporal Coverage End 1973-08-24T00:00:00Z