Patrick Grunert

Patrick Grunert
University of Cologne | UOC · Institute of Geology and Mineralogy

PhD

About

68
Publications
25,312
Reads
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1,418
Citations
Introduction
It's all about forams - paleobiology, geochemistry, paleoceanography, paleoclimate, paleoenvironment, you name it...
Additional affiliations
November 2017 - present
University of Cologne
Position
  • Professor
October 2015 - September 2017
Karl-Franzens-Universität Graz
Position
  • PostDoc Position
October 2014 - September 2015
Rutgers, The State University of New Jersey
Position
  • PostDoc Position
Description
  • Mediterranean Outflow Water in the N Atlantic during the late Pliocene and early Pleistocene
Education
October 2007 - August 2011
Karl-Franzens-Universität Graz
Field of study
  • Geobiology and Palaeoecology
October 2002 - July 2007
University of Vienna
Field of study
  • Paleobiology

Publications

Publications (68)
Article
Full-text available
Census counts of benthic foraminifera were studied from the SW Iberian Margin to reconstruct past changes in deep-water hydrography across Terminations I and II. Detailed benthic faunal data (> 125 μm size-fraction) allow us to evaluate the limitations imposed by taphonomic processes and restricted size-fractions. The comparison of recent (mudline)...
Article
Full-text available
Sediments cored along the southwestern Iberian margin during Integrated Ocean Drilling Program Expedition 339 provide constraints on Mediterranean Outflow Water (MOW) circulation patterns from the Pliocene epoch to the present day. After the Strait of Gibraltar opened (5.33 million years ago), a limited volume of MOW entered the Atlantic. Depositio...
Article
Full-text available
The geochemical signature of fossils from Lago Mare deposits at Moncucco Torinese (NW Italy) indicates a temporary marine ingression into the Tertiary Piedmont Basin just before the Miocene/Pliocene boundary. Isotope (δ18O, δ13C, 87Sr/86Sr) and trace element (Sr/Ca, Ba/Ca) data from mollusk shells of multiple species and croacker otoliths indicate...
Article
Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 throu...
Article
Herein, we report quantitative micropaleontological (benthic foraminifers, dinoflagellate cysts, calcareous nannoplankton), sedimentological (grain-size analysis) and geophysical (background gamma radiation) analyses from Ottnang–Schanze, the stratotype for the regional Ottnangian stage (Central Paratethys; Lower Miocene, middle Burdigalian). The r...
Article
Full-text available
This study presents new quantitative data on benthic foraminifera from three bathymetric transects of the Brazil (11-14°S, 420-1900 m) and Campos (22°S, 430-2000 m) basins. The quantity and quality of organic matter flux as well as substrate properties and hydrodynamic conditions at the sediment-water interface are identified as key parameters cont...
Article
Full-text available
The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9–2.7 million years ago. Here we present sedimentary geochemical proxy data from the Gulf...
Conference Paper
Full-text available
Certain highly adapted epibenthic foraminifera colonize the high-current areas of vast contourite deposits as opportunistic suspension feeders. These extensive sediment bodies are formed by persistent bottom currents and are widespread in the North Atlantic. Contourite deposits represent valuable archives for foraminiferal research to develop botto...
Article
Full-text available
The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9–2.7 million years ago. Here we present sedimentary geochemical proxy data from the Gulf...
Conference Paper
Full-text available
Benthic foraminifera colonize a wide range of marine environments, including contourite drift systems (CDS). CDS are characterized by sustained bottom currents and cover large areas on the seafloor, e.g., in the North Atlantic. Due to their high sedimentation rates, they represent fundamental archives for paleoclimatology and paleoceanography. Some...
Article
Full-text available
40 Ar/ 39 Ar radio-isotopic dating of volcanic tuffs intercalated in sediments can provide high accuracy age control on the deposition of sedimentary rocks. State-of-the-art mass spectrometers such as the ARGUS VI+ are able to acquire highly precise ages for relatively small single grains (~90-250 μm for Miocene samples). Single grain measurement c...
Article
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Detailed characterization of variations in sediment architecture, flux, and transport processes in peri-orogenic basins offers insights into external climatic or tectonic forcings. We tested how four well-known tectonic/erosional events in the Oligocene/Miocene Alpine source area are recorded in the sediment-accumulation rates (SARs) of the deep ma...
Conference Paper
Full-text available
Foraminiferal research contributing to the elucidation of past climate variability has become more and more combined with geochemical approaches. It is of utmost importance to understand the (palaeo)ecological context of the taxa and species studied before the geochemical data from the foraminiferal test can be correctly interpreted. Moreover , bio...
Article
Full-text available
The Pliocene was characterized by a gradual shift of global climate toward cooler and drier conditions. This shift fundamentally reorganized Earth's climate from the Miocene state toward conditions similar to the present. During the Pliocene, the progressive restriction of the Indonesian Throughflow (ITF) is suggested to have enhanced this shift to...
Article
The Central Paratethys was a large-scale Oligo-Miocene epicontinental sea located in Central and Eastern Europe. It was separated from the Mediterranean by the Alpine orogenic belt. The Paratethys progressively flooded the Pannonian back-arc basin that formed during the early to middle Miocene. Along the southern margin of the basin, the maximum ex...
Article
Full-text available
Mediterranean–Atlantic exchange through the Strait of Gibraltar plays a significant role in the global ocean–climate dynamics in two ways. On one side, the injection of the saline and warm Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water fo...
Article
Full-text available
Hydrocarbon exploration in the Bernhardsthal and Bernhardsthal-Sued oil fields documents an up to 2000 m thick succession of middle and upper Badenian deposits in this part of the northern Vienna Basin (Austria). Based on palaeontological analyses of core-samples, well-log data and seismic surveys we propose an integrated stratigraphy and describe...
Article
Full-text available
Mediterranean-Atlantic exchange through the Strait of Gibraltar plays a significant role in the global ocean-climate dynamics in two ways. On one side, the injection of the saline and warm Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water fo...
Article
Full-text available
Oligocene and Lower Miocene deposits in the Paratethys are important source rocks, but reveal major stratigraphic and regional differences. As a consequence of the first Paratethys isolation, source rocks with very good oil potential accumulated during Early Oligocene time in the Central Paratethys. Coeval source rocks in the Eastern Paratethys are...
Article
Full-text available
Costate species of Bulimina are cosmopolitan, infaunal benthic foraminifers which are common in the fossil record since the Paleogene. In the present study, we evaluate the temperature dependency of Mg/Ca ratios in Bulimina inflata, B. mexicana and B. costata from an extensive set of core-top samples from the Atlantic, Pacific and Indian Oceans. Th...
Article
Full-text available
The ultimate, possibly geodynamic control and potential impact of changes in circulation activity and salt discharge of Mediterranean outflow waters (MOW) on Atlantic meridional overturning circulation have formed long-standing objectives in paleoceanography. Late Pliocene changes in the distal advection of MOW were reconstructed on orbital timesca...
Article
The presence and high abundances of the benthic foraminiferal group “elevated epifauna” has been proposed as indicator of the existence of Mediterranean Outflow Water (MOW) in the Gulf of Cadiz. Here we intend to use this potential proxy to reconstruct MOW in the early Pliocene at the Integrated Ocean Drilling Program (IODP) Hole U1387C. Cibicides...
Conference Paper
Full-text available
The origin and potential impact of changes in the flow strength and salt discharge of Mediterranean Outflow Waters (MOW) on Atlantic Meridional Overturning Circulation have been long-standing objectives of (paleo-) oceanographers. Late Pliocene changes in the distal advection of MOW were reconstructed on orbital timescales for northeast Atlantic DS...
Article
Full-text available
Gaining insights into the evolution of Mediterranean Outflow Water (MOW) during the Early Pleistocene has been so far hampered by the lack of available palaeoclimatic archives. Here we present the first benthic foraminifera stable oxygen and carbon isotope records and grain-size data from IODP Expedition 339 Site U1389 presently located within the...
Article
For the first time during an Integrated Ocean Drilling Program (IODP) Expedition (Exp. 339, Mediterranean Outflow) water samples for living coccolithophore distributions and mudline samples for coccoliths, benthic foraminifera, and geochemical analyses in the underlying surface sediments were collected. In total, 14 water samples (from 5 to 20 m wa...
Article
Upper Miocene to lower Pliocene sediment cores from Integrated Ocean Drilling Program (IODP) Hole U1387C (IODP Expedition 339) have been studied. The main goal of this study is to reconstruct initial Mediterranean-Atlantic water exchange after the opening of the Gibraltar Strait in the early Pliocene. Benthic foraminiferal assemblages are the focus...
Article
We present a revision and refinement of the age model for upper Pliocene (2.6-3.7 Myrs) sediments recovered from the southern Iberian Margin at IODP Hole U1389E. New biostratigraphic data from discrete samples allow 1) the identification of a distinct increase in abundances of Neogloboquadrina atlantica (sin), dated to 2.72 Ma at sites in the North...
Article
Integrated Ocean Drilling Program (IODP) Expedition 339 cored multiple sites in the Gulf of Cadiz in order to study contourite deposition resulting from Mediterranean Outflow water (MOW). One hole, U1387C, was cored to a depth of 865.6 meters below seafloor (mbsf) with the goal of recovering the Latest Miocene to Pliocene transition in order to eva...
Article
Full-text available
We produced a composite depth scale and chronology for Site U1385 on the SW Iberian Margin. Using log(Ca/Ti) measured by core scanning XRF at 1-cm resolution in all holes, a composite section was constructed to 166.5 meter composite depth (mcd) that corrects for stretching and squeezing in each core. Oxygen isotopes of benthic foraminifera were cor...
Article
In this study, a strongly deteriorated concrete-based sewer system was investigated by using a multi proxy approach based on gaseous, hydro-geochemical, microbiological, mineralogical and mechanical analyses. Therefore, gas, liquid, and solid samples were taken throughout the entire sewer system. Long term measurements of gaseous hydrogen sulfide (...
Article
Numerous studies focused on the transitions between glacial and interglacial periods, the so-called terminations, due to the associated significant reorganizations of the ocean-atmosphere system. However, analyses combining macro- and micropaleontological information are near absent. In this research, an integrative study of trace fossils and benth...
Article
Full-text available
Herein, we present a new stratigraphic model for the upper Oligocene to lower Miocene Puch kirchen Group which comprises deep-marine deposits in the central North Alpine Foreland Basin. Stratigraphic constraints are inferred from the integration of new bio- (calcareous nannoplankton) and chemostratigraphic (δ13Cbulk) data from the drill-site Hochbu...
Article
Full-text available
The Early Ottnangian Cooling (EOC), a distinct cold-spell in European climate at ~ 18 Ma preceeding the Miocene Climate Optimum, is frequently reported in Paratethys records; however, the duration, magnitude, and underlying causes are poorly understood. A new paleoclimatic data-set provides unexpected insights into this event. UK’37-based sea-surfa...
Article
Full-text available
Sediments cored along the southwestern Iberian margin during Integrated Ocean Drilling Program Expedition 339 provide constraints on Mediterranean Outflow Water (MOW) circulation patterns from the Pliocene epoch to the present day. After the Strait of Gibraltar opened (5.33 million years ago), a limited volume of MOW entered the Atlantic. Depositio...
Conference Paper
Full-text available
The opening and closing of ocean gateways play an important role amongst climate forcing mechanisms: along with paleogeography, surface and deep-water circulation are altered, and hence global heat transport. An important component of North Atlantic circulation patterns is the warm and saline Mediterranean Outflow Water (MOW) that enters the North...
Conference Paper
Full-text available
Communities of deep-sea foraminifera are sensitive recorders of environmental conditions. Consequently, the ac-tualistic interpretation of fossil foraminiferal assemblages has become a valuable tool for the reconstruction of paleoceanographic conditions at the sea-floor. For the present study, a quantitative data-set of benthic foraminifera >125µm...
Conference Paper
Full-text available
Site U1385 was selected and drilled in the Portuguese margin, at a location close to the so-called Shackleton Site MD95-2042 (in honor of the late Sir Nicholas Shackleton, 37 • 48'N 10 • 10 W, 3146 m water depth), during IODP Expedition 339 (Mediterranean Outflow Water in the Gulf of Cadiz and coastal areas off West Iberia, North East Atlantic), to...
Article
Full-text available
We describe the first shallow marine and hard-ground associated gastropod assemblage from the Ottnangian (Early Miocene) of the Central Paratethys Sea. In many cases, the poor and usually fragmentary preservation as casts and moulds does not allow a definitive identification. Nevertheless, the small assemblage – comprising 32 species-level taxa – s...
Conference Paper
In order to explore the effects of Mediterranean Outflow Water (MOW) on North Atlantic circulation and climate, Integrated Ocean Drilling Program (IODP) Expedition 339 (Mediterranean Outflow) cored a series of sites in the Gulf of Cadiz slope and off West Iberia (North East Atlantic). Site U1385 (37°48'N, 10°10'W, 3146 m water depth) was selected a...
Article
Full-text available
IODP Expedition 339 drilled five sites in the Gulf of Cadiz and two off the west Iberian margin (November 2011 to January 2012), and recovered 5.5 km of sediment cores with an average recovery of 86.4%. The Gulf of Cadiz was targeted for drilling as a key location for the investigation of Mediterranean outflow water (MOW) through the Gibraltar Gate...
Article
Full-text available
Nick Shackleton’s research on piston cores from the Iberian margin highlighted the importance of this region for providing high-fidelity records of millennial-scale climate variability, and for correlating climate events from the marine environment to polar ice cores and European terrestrial sequences. During the Integrated Ocean Drilling Program (...
Article
Full-text available
Characterization of trace fossils in marine core sediments is, most times, difficult due to the weak differ-entiation between biogenic structures and the host sedi-ment, especially in pelagic and hemipelagic facies. This problem is accentuated where a high degree of bioturbation is associated with composite ichnofabrics. Simple methods are presente...
Conference Paper
Full-text available
IODP Expedition 339 recently drilled 5 sites in the Gulf of Cádiz and 2 west off Portugal, and recovered 5.5 km of core. The Gulf of Cádiz was targeted for drilling 1) to investigate the Mediterranean Outflow Water (MOW) and its influence on global circulation and climate, and 2) to understand the effects of tectonic activity and eustatic changes o...
Article
Full-text available
New stratigraphic and palaeoenvironmental data are presented for the northeastern part of the Trento Plateau (Puez area, Southern Alps, Italy). The studied section corresponds to the upper Hauterivian Balearites balearis and “Pseudothurmannia ohmi” ammonite zones and normal palaeomagnetic chron upper M5. A c. 30-cm-thick bed is identified as the eq...
Article
Full-text available
IODP Expedition 339 drilled five sites in the Gulf of Cadiz and two off the west Iberian margin (November 2011 to January 2012), and recovered 5.5 km of sediment cores with an average recovery of 86.4 %. The Gulf of Cadiz was targeted for drilling as a key location for the investigation of Mediterranean outflow wa-ter (MOW) through the Gibraltar Ga...
Data
Herein, we report quantitative micropaleontological (benthic foraminifers, dinoflagellate cysts, calcareous nannoplankton), sedimentological (grain-size analysis) and geophysical (background gamma radiation) analyses from Ottnang-Schanze, the stratotype for the regional Ottnangian stage (Central Paratethys; Lower Miocene, middle Burdigalian). The r...
Article
Full-text available
The origin of the mainly sea-turtle fouling balanomorph family Chelonibiidae is still poorly documented. Aside from an Eocene erratic specimen assigned to an extinct subfamily, the extant subfamily Chelonibiinae did not appear in the fossil record before the Late Miocene. Protochelonibiinae Harzhauser & Newman subfam. nov. is here introduced as an...
Article
Full-text available
Integrated high-resolution stratigraphy of a Middle to Late Miocene sedimentary sequence in the central part of the Vienna Basin In order to determine the relative contributions of tectonics and eustasy to the sedimentary infill of the Vienna Basin a high-resolution stratigraphic record of a Middle to Late Miocene sedimentary sequence was establish...
Article
The Western Tethyan estuarine oyster Crassostrea gryphoides is an excellent climate archive due to its large size and rapid growth. It is geologically long lived and allows a stable isotope-based insight into climatic trends during the Miocene. Herein we utilised the climate archive of 5 oyster shells from the Miocene Climate Optimum (MCO) and the...
Article
Full-text available
Round karren represent a typical karst landform in humid regions. Since they only form beneath organic-rich soil and become rapidly destroyed after exhumation, their preservation potential in the geological record is, how-ever, low. Herein, we describe pristine fossil round karren from a late Messinian karrenfeld that is incised into a fault scarp...
Article
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The Ottnangian stage represents the middle Burdigalian (c. 18.1-17.2 Ma) within the regional stratigraphic concept for the Central Paratethys. The section Ottnang-Schanze in the North Alpine Foreland Basin of Upper Austria has been defined as its stratotype by Rögl et al. (1973). We present an updated stratigraphic evaluation of the section based o...