TY - JOUR
T1 - Stable isotopic, assemblage, and paleoenvironmental investigations of juvenile-ocean sediments recovered on Leg 122, Wombat Plateau, northwest Australia
AU - Bralower, T. J.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1992
Y1 - 1992
N2 - A sedimentary sequence documenting the early history of the proto-Indian Ocean was drilled at Site 761. Directly above the post-rift unconformity, two lithologic units were recovered which reflect deposition in incipient oceanic environments. The lower unit, composed of sandstone, contains abundant belemnites and a few lenses composed of low-diversity coccolith assemblages. The second unit, composed of chalk, contains abundant calcispheres, thoracospheres, low-diversity coccolith assemblages, and a few radiolarians. Belemnites and organisms that produced calcispheres and thoracospheres are thought to be opportunistic. Their abundance, and the absence of a normal marine fauna and flora, reflects an unstable early ocean environment. Stable oxygen and carbon isotopic data for the two units fall into almost separate fields. Heavy δ18O values for the belemnites indicate that they have not been affected by recrystallization. Instead, these isotopic values are thought to indicate either the deep, cool habitat of the belemnites or strong vital effects. -from Author
AB - A sedimentary sequence documenting the early history of the proto-Indian Ocean was drilled at Site 761. Directly above the post-rift unconformity, two lithologic units were recovered which reflect deposition in incipient oceanic environments. The lower unit, composed of sandstone, contains abundant belemnites and a few lenses composed of low-diversity coccolith assemblages. The second unit, composed of chalk, contains abundant calcispheres, thoracospheres, low-diversity coccolith assemblages, and a few radiolarians. Belemnites and organisms that produced calcispheres and thoracospheres are thought to be opportunistic. Their abundance, and the absence of a normal marine fauna and flora, reflects an unstable early ocean environment. Stable oxygen and carbon isotopic data for the two units fall into almost separate fields. Heavy δ18O values for the belemnites indicate that they have not been affected by recrystallization. Instead, these isotopic values are thought to indicate either the deep, cool habitat of the belemnites or strong vital effects. -from Author
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U2 - 10.2973/odp.proc.sr.122.155.1992
DO - 10.2973/odp.proc.sr.122.155.1992
M3 - Article
AN - SCOPUS:0026448832
SN - 0042-1215
SP - 569
EP - 585
JO - Unknown Journal
JF - Unknown Journal
ER -