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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ftucl:oai:eprints.ucl.ac.uk.OAI2:157345 2024-10-13T14:10:56+00:00 The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes Frank, TD Thomas, DJ Leckie, RM Arthur, MA Bown, PR Jones, K Lees, JA 2005-02-09 application/pdf https://discovery.ucl.ac.uk/id/eprint/157345/1/2004PA001052.pdf https://discovery.ucl.ac.uk/id/eprint/157345/ eng eng AMER GEOPHYSICAL UNION https://discovery.ucl.ac.uk/id/eprint/157345/1/2004PA001052.pdf https://discovery.ucl.ac.uk/id/eprint/157345/ open Paleoceanography , 20 (1) , Article PA1008. (2005) Sea-surface temperatures Cretaceous-tertiary boundary Deep-ocean circulation Rare-earth elements Benthic foraminifera Ferromanganese crusts Inoceramid extinction Environmental-changes Isotopic composition Residence time Article 2005 ftucl 2024-09-30T07:42:09Z 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'' similar to 69 Ma, manifested by the brief appearance of abundant inoceramid bivalves over shallow portions of Shatsky Rise, is characterized by an abrupt increase (similar to 2degrees -3degrees C) in sea surface temperatures, a greater flux of organic matter out of the surface ocean, and warmer ( similar to 4degrees 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. Article in Journal/Newspaper Southern Ocean University College London: UCL Discovery Pacific Southern Ocean |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Sea-surface temperatures Cretaceous-tertiary boundary Deep-ocean circulation Rare-earth elements Benthic foraminifera Ferromanganese crusts Inoceramid extinction Environmental-changes Isotopic composition Residence time |
spellingShingle |
Sea-surface temperatures Cretaceous-tertiary boundary Deep-ocean circulation Rare-earth elements Benthic foraminifera Ferromanganese crusts Inoceramid extinction Environmental-changes Isotopic composition Residence time Frank, TD Thomas, DJ Leckie, RM Arthur, MA Bown, PR Jones, K Lees, JA The Maastrichtian record from Shatsky Rise (northwest Pacific): A tropical perspective on global ecological and oceanographic changes |
topic_facet |
Sea-surface temperatures Cretaceous-tertiary boundary Deep-ocean circulation Rare-earth elements Benthic foraminifera Ferromanganese crusts Inoceramid extinction Environmental-changes Isotopic composition Residence time |
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'' similar to 69 Ma, manifested by the brief appearance of abundant inoceramid bivalves over shallow portions of Shatsky Rise, is characterized by an abrupt increase (similar to 2degrees -3degrees C) in sea surface temperatures, a greater flux of organic matter out of the surface ocean, and warmer ( similar to 4degrees 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 |
Article in Journal/Newspaper |
author |
Frank, TD Thomas, DJ Leckie, RM Arthur, MA Bown, PR Jones, K Lees, JA |
author_facet |
Frank, TD Thomas, DJ Leckie, RM Arthur, MA Bown, PR Jones, K Lees, JA |
author_sort |
Frank, TD |
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 |
AMER GEOPHYSICAL UNION |
publishDate |
2005 |
url |
https://discovery.ucl.ac.uk/id/eprint/157345/1/2004PA001052.pdf https://discovery.ucl.ac.uk/id/eprint/157345/ |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Paleoceanography , 20 (1) , Article PA1008. (2005) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/157345/1/2004PA001052.pdf https://discovery.ucl.ac.uk/id/eprint/157345/ |
op_rights |
open |
_version_ |
1812818494094311424 |