Paleomagnetic and Rock Magnetic Properties of Sediment Samples from Ocean Drilling Program Leg 116, Central Indian Ocean

1990 ◽  
Author(s):  
S.A. Hall ◽  
W.W. Sager
Keyword(s):  
Magnetic Properties ◽  
Indian Ocean ◽  
Ocean Drilling Program ◽  
Sediment Samples ◽  
Ocean Drilling ◽  
Central Indian Ocean ◽  
Rock Magnetic Properties

Paleomagnetic and rock magnetic investigation in marine sediments, Nankai Trough, offshore Cape Muroto

2020 ◽  
Author(s):  
Myriam Kars ◽  
Tetsuya Fukuta ◽  
Carina Becker
Keyword(s):  
Magnetic Properties ◽  
Marine Sediments ◽  
Nankai Trough ◽  
Temperature Limit ◽  
Ocean Drilling Program ◽  
Scientific Drilling ◽  
Diagenetic Alteration ◽  
Rock Magnetic Properties ◽  
Mineral Assemblages ◽  
International Ocean Discovery Program

<p><span>The Nankai Trough is an accretionary complex which extends over several thousands of kilometers along the Japanese Pacific coast. Many ocean scientific drilling expeditions have taken place in this zone to better understand the mechanisms of big earthquakes and generation of devastating tsunamis. Offshore Cape Muroto, Shikoku Island, is one of investigated zones. A recent International Ocean Discovery Program (IODP) expedition (IODP Expedition 370) in the area has focused on the temperature limit of life in deep subseafloor sediments. Here we present paleomagnetic and rock magnetic preliminary results on two neighboring sites in this zone drilled during two former Ocean Drilling Program (ODP) legs: Site 808 of ODP Leg 131 and Site 1174 of ODP Leg 190. At all sites, shipboard magnetostratigraphy was challenging because of a strong diagenetic alteration of the magnetic mineral assemblages. Four main downcore magnetic zones, characterized by specific magnetic properties and mineralogy, are identified. At Site 808, catagenesis of the organic matter has been proposed to explain the downcore rock magnetic properties. This explanation however could not stand for Site 1174. We present here a first attempt of a comparative paleomagnetic and rock magnetic study in high temperature marine sediments, off Cape Muroto. </span></p>

Planktonic Foraminiferal Endemism at Southern High Latitudes Following the Terminal Cretaceous Extinction

2020 ◽  
Vol 50 (4) ◽  
pp. 382-402
Author(s):  
Brian T. Huber ◽  
Maria Rose Petrizzo ◽  
Kenneth G. MacLeod
Keyword(s):  
Indian Ocean ◽  
High Latitude ◽  
Planktonic Foraminifera ◽  
South Atlantic ◽  
Weddell Sea ◽  
Southern Indian Ocean ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Mode Of Life ◽  
Southern High Latitude

Abstract Austral planktonic foraminiferal assemblages from immediately above the Cretaceous/Paleogene (K/Pg) boundary at Ocean Drilling Program Hole 690C (Maud Rise, Weddell Sea) and International Ocean Drilling Program Hole U1514C (southeast Indian Ocean) show a much different record of post-extinction recovery than anywhere outside the circum-Antarctic region. Species of Woodringina and Parvularugoglobigerina, genera with well-documented evolutionary successions within the early Danian P0 and Pα biozones at tropical/subtropical and mid-latitude localities, are absent from southern high latitude sequences. This study proposes new criteria for biostratigraphic correlation of the lowermost Danian Antarctic Paleocene AP0 and AP1 Zones using stratophenetic observations from Scanning Electron Microscope images of lower Danian planktonic foraminifera at deep-sea sites in the southern South Atlantic and southern Indian Ocean. The small but distinctive species Turborotalita nikolasi (Koutsoukos) is a highly reliable index species for the lowermost Danian as it consistently occurs immediately above the K/Pg boundary at multiple southern high latitude sites, which is consistent with its distribution at middle and low latitudes. Also useful for cross-latitude correlation is Parasubbotina neanika n. sp., which first appears within the lowermost Danian worldwide. The geographic distribution of the New Zealand species Antarcticella pauciloculata (Jenkins) and Zeauvigerina waiparaensis (Jenkins), as well as Eoglobigerina maudrisensis n. sp. from just above the K/Pg in the southern South Atlantic and southern Indian Ocean, helps define the extent of the Austral Biogeographic Province and provides evidence for marine communication via marine seaways across Antarctica. While An. pauciloculata was previously considered a benthic species, new stable isotope evidence demonstrates that it lived a planktonic mode of life. It is possible this species evolved from a benthic ancestor and that the benthic to planktonic transition occurred through an intermediate tychopelagic lifestyle at a time when calcareous plankton were less abundant as a result of the terminal Cretaceous mass extinction.

scholarly journals Pliocene–Pleistocene radiolarian and diatom biostratigraphy of ODP Hole 709C (equatorial Indian Ocean)

1995 ◽  
Vol 14 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Simon K. Haslett ◽  
Kevin Kennington ◽  
Brian M. Funnell ◽  
Claire L. Kersley
Keyword(s):  
Indian Ocean ◽  
Oxygen Isotope ◽  
Equatorial Indian Ocean ◽  
Early Pleistocene ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Zones And Subzones

Abstract. Ocean Drilling Program (ODP) Hole 709C was drilled on Madingley Rise in the equatorial Indian Ocean. Thirteen radiolarian and diatom events were identified in the Pliocene to Early Pleistocene section studied. Five radiolarian zones could be recognized: Anthocyrtidium angulare, Pterocanium prismatium, Anthocyrtidium jenghisi, Stichocorys peregrina, and Phormostichoartus doliolum zones. The LAD of P. prismatium was found to be an unreliable indicator of the base of the A. angulare zone in Hole 709C and in other upwelling areas. Accordingly, the base of the A. angulare zone is redefined here by the FAD of A. angulare. The Phormostichoartus fistula zone, which normally separates the 5. peregrina and P. doliolum zones, could not be identified due to the scarcity of P. fistula. Standard tropical diatom Pliocene–Pleistocene zones and subzones were identified: Nitzschia reinholdii, Rhizosolenia praebergonii, and Nitzschia jouseae zones. The development of oxygen isotope calibrated dates enabled the dating of some radiolarian events: FAD A. angulare 1.65 Ma, LAD Theocorythium vetulum 2 Ma, LAD A. jenghisi 2.21 Ma, FAD Theocalyptra davisiana 2.33 Ma, FAD Theocorythium trachelium 2.33 Ma, and FAD Lamprocyrtis neoheteroporos 2.4 Ma.

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