Neogene history of the calcite compensation depth and lysocline in the South Pacific Ocean

Author(s): Rea, David K.; Leinen, Margaret
Author Affiliation(s): Primary:
Univ. Mich., Oceanogr. Program, Ann Arbor, MI, United States
Other:
Univ. R.I., United States
Volume Title: Nature (London)
Source: Nature (London), 316(6031), p.805-807. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. 30 refs.; illus. incl. sketch map
Summary: The depth-time pattern of calcite accumulation recorded at DSDP sites beneath the oligotrophic sub-tropical gyre in the SE Pacific Ocean allows the definition of the CCD and the lysocline. The Neogene CCD history is one of shoaling before 15 or 20 m.y., and subsequent deepening to the present level of 4100 m. A broad zone of increased calcite dissolution, 600 m thick, formed during early to middle Miocene time and has remained. This zone, the lysocline, denotes an important change in ocean chemistry and may reflect either an increase in the volume of more corrosive deep water, beginning approx 18 m.y. and reaching steady state by 14 m.y. - the time of rapid ice build-up in Antarctica - or an increase in calcite rain-rate caused by an increase in surface-water productivity.
Year of Publication: 1985
Research Program: DSDP Deep Sea Drilling Project
Key Words: 07 Marine Geology and Oceanography; 12 Stratigraphy, Historical Geology and Paleoecology; Bioclastic sedimentation; Calcite; Carbonate compensation depth; Carbonates; Cenozoic; Deep Sea Drilling Project; Deep-sea sedimentation; Lysoclines; Marine sedimentation; Marine sediments; Mineral composition; Neogene; Pacific Ocean; Paleo-oceanography; Processes; Sedimentation; Sediments; South Pacific; Stratigraphy; Tertiary
Record ID: 1986005587
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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