The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes
We present new isotopic and micropaleontological data from a depth transect on Shatsky Rise that record the response of the tropical Pacific to global biotic and oceanographic shifts during the mid-Maastrichtian. Results reveal a coupling between the upper ocean, characterized by a weak thermocline...
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2005
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ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1106 2023-11-12T04:26:40+01:00 The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes Frank, Tracy D Thomas, Deborah J. Leckie, R. Mark Arthur, Michael A. Brown, Paul R. Jones, Kelly Lees, Jackie A. 2005-02-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/107 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1106/viewcontent/Frank_PALEOCEANOGRAPHY_2005_Maastrictian_record__DC_VERSION.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/107 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1106/viewcontent/Frank_PALEOCEANOGRAPHY_2005_Maastrictian_record__DC_VERSION.pdf Papers in the Earth and Atmospheric Sciences Earth Sciences text 2005 ftunivnebraskali 2023-10-30T10:38:06Z We present new isotopic and micropaleontological data from a depth transect on Shatsky Rise that record the response of the tropical Pacific to global biotic and oceanographic shifts during the mid-Maastrichtian. Results reveal a coupling between the upper ocean, characterized by a weak thermocline and low to intermediate productivity, and intermediate waters. During the earliest Maastrichtian, oxygen and neodymium isotope data suggest a significant contribution of relatively warm intermediate water from the North Pacific. Isotopic shifts through the early Maastrichtian suggest that this warmer water mass was gradually replaced by cooler waters originating in the Southern Ocean. Although the cooler water mass remained dominant through the remainder of the Maastrichtian, it was displaced intermittently at shallow intermediate depths by North Pacific intermediate water. The globally recognized ‘‘mid-Maastrichtian event’’ ~69 Ma, manifested by the brief appearance of abundant inoceramid bivalves over shallow portions of Shatsky Rise, is characterized by an abrupt increase (~2°–3°C) in sea surface temperatures, a greater flux of organic matter out of the surface ocean, and warmer (~4°C) intermediate waters. Results implicate simultaneous changes in surface waters and the sources/ distribution patterns of intermediate water masses as an underlying cause for widespread biotic and oceanographic changes during mid-Maastrichtian time. Text Southern Ocean University of Nebraska-Lincoln: DigitalCommons@UNL Southern Ocean Pacific |
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University of Nebraska-Lincoln: DigitalCommons@UNL |
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ftunivnebraskali |
language |
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topic |
Earth Sciences |
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Earth Sciences Frank, Tracy D Thomas, Deborah J. Leckie, R. Mark Arthur, Michael A. Brown, Paul R. Jones, Kelly Lees, Jackie A. The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
topic_facet |
Earth Sciences |
description |
We present new isotopic and micropaleontological data from a depth transect on Shatsky Rise that record the response of the tropical Pacific to global biotic and oceanographic shifts during the mid-Maastrichtian. Results reveal a coupling between the upper ocean, characterized by a weak thermocline and low to intermediate productivity, and intermediate waters. During the earliest Maastrichtian, oxygen and neodymium isotope data suggest a significant contribution of relatively warm intermediate water from the North Pacific. Isotopic shifts through the early Maastrichtian suggest that this warmer water mass was gradually replaced by cooler waters originating in the Southern Ocean. Although the cooler water mass remained dominant through the remainder of the Maastrichtian, it was displaced intermittently at shallow intermediate depths by North Pacific intermediate water. The globally recognized ‘‘mid-Maastrichtian event’’ ~69 Ma, manifested by the brief appearance of abundant inoceramid bivalves over shallow portions of Shatsky Rise, is characterized by an abrupt increase (~2°–3°C) in sea surface temperatures, a greater flux of organic matter out of the surface ocean, and warmer (~4°C) intermediate waters. Results implicate simultaneous changes in surface waters and the sources/ distribution patterns of intermediate water masses as an underlying cause for widespread biotic and oceanographic changes during mid-Maastrichtian time. |
format |
Text |
author |
Frank, Tracy D Thomas, Deborah J. Leckie, R. Mark Arthur, Michael A. Brown, Paul R. Jones, Kelly Lees, Jackie A. |
author_facet |
Frank, Tracy D Thomas, Deborah J. Leckie, R. Mark Arthur, Michael A. Brown, Paul R. Jones, Kelly Lees, Jackie A. |
author_sort |
Frank, Tracy D |
title |
The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
title_short |
The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
title_full |
The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
title_fullStr |
The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
title_full_unstemmed |
The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
title_sort |
maastrichtian record from shatsky rise (northwest pacific): a tropical perspective on global ecological and oceanographic changes |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2005 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/107 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1106/viewcontent/Frank_PALEOCEANOGRAPHY_2005_Maastrictian_record__DC_VERSION.pdf |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/107 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1106/viewcontent/Frank_PALEOCEANOGRAPHY_2005_Maastrictian_record__DC_VERSION.pdf |
_version_ |
1782340565820506112 |