Jens Herrle | Goethe-Universität Frankfurt am Main (original) (raw)

Papers by Jens Herrle

Research paper thumbnail of (Table 1) Stable carbon and oxygen isotope ratios of planktic and benthic foraminifera in early Maastrichtian sediments of DSDP Hole 44-390A in the North Atlantic

Research paper thumbnail of Planktic/benthic foraminiferal ratio of sediment core Kronsmoor, Late Cretaceous

Research paper thumbnail of Micropaleontological investigation of sediment core Kronsmoor, supplement to: Friedrich, Oliver; Herrle, Jens O; Hemleben, Christoph (2005): Climatic changes in the Late Campanian through Early Maastrichtian: micropaleontological and stable isotopic evidence from an epicontinental sea. Journal of...

Benthic foraminiferal and calcareous nannofossil assemblages, as well as stable isotope data from... more Benthic foraminiferal and calcareous nannofossil assemblages, as well as stable isotope data from the Campanian/Maastrichtian boundary interval (~71.4 to ~70.7 Ma) of the Kronsmoor section (North German Basin), were investigated in order to characterize changes in surface-water productivity and oxygen content at the seafloor and their link to climatic and paleoceanographic changes. A nutrient index based on calcareous nannofossils is derived for the high-latitude, epicontinental North German Basin, reflecting changes in surface-water productivity. Oxygen isotopes of well-preserved planktic foraminiferal specimens of Heterohelix globulosa reflect warmer surface-water temperatures in the lower part of the studied succession and a cooling of up to 2°C (0.5 per mil) in the upper part (after 71.1 Ma). For the lower and warmer part of the investigated succession, benthic foraminiferal assemblages and the calcareous nannofossils indicate well-oxygenated bottom waters and low-surface water ...

Research paper thumbnail of Grey values of ODP Hole 44-390A

Research paper thumbnail of Cretaceous nannofossils in profile Serre Chaitieu, SE France

Research paper thumbnail of Range chart of nannofossils in profile Serre Chaitieu, SE France

Range chart of nannofossils in profile Serre Chaitieu, SE France

Research paper thumbnail of (Fig. 10A) Spores and pollen of Cretaceous profile L´Arboudeysse, SE France

Research paper thumbnail of (Fig. 4) Nannofossil abundance of Cretaceous profile Pré-Guittard, SE France

Research paper thumbnail of (Fig. 8) Nutrient and temperature index calculated from profile Pré-Guittard, SE France

Research paper thumbnail of Abundance of nannoplankton of sediment core Kronsmoor, Late Cretaceous

Research paper thumbnail of Black shales from the Upper Aptian and Lower Albanian of the Volcontian Basin

Calcareous nannoplankton, palynomorph, benthic foraminifera, and oxygen isotope records from the ... more Calcareous nannoplankton, palynomorph, benthic foraminifera, and oxygen isotope records from the supraregionally distributed Niveau Paquier (Early Albian age, Oceanic Anoxic Event 1b) and regionally distributed Niveau Kilian (Late Aptian age) black shales in the Vocontian Basin (SE France) exhibit variations that reflect paleoclimatic and paleoceanographic changes in the mid-Cretaceous low latitudes. To quantify surface water productivity and temperature changes, nutrient and temperature indices based on calcareous nannofossils were developed. The nutrient index strongly varies in the precessional band, whereas variations of the temperature index reflect eccentricity. Since polar ice caps were not present during the mid-Cretaceous, these variations probably result from feedback mechanisms within a monsoonal climate system of the mid-Cretaceous low latitudes involving warm/humid and cool/dry cycles. A model is proposed that explains the formation of mid-Cretaceous black shales through monsoonally driven changes in temperature and evaporation/precipitation patterns. The Lower Albian Niveau Paquier, which has a supraregional distribution, formed under extremely warm and humid conditions when monsoonal intensity was strongest. Bottom water ventilation in the Vocontian Basin was diminished, probably due to increased precipitation and reduced evaporation in regions of deep water formation at low latitudes. Surface water productivity in the Vocontian Basin was controlled by the strength of monsoonal winds. The Upper Aptian Niveau Kilian, which has a regional distribution only, formed under a less warm and humid climate than the Niveau Paquier. Low-latitude deep water formation was reduced to a lesser extent and/or on regional scale only. The threshold for the formation of a supraregional black shale was not reached. The intensity of increases in temperature and humidity controlled whether black shales developed on a regional or supraregional scale. At least in the Vocontian Basin, the increased preservation of organic m [...]

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Serre_Chaitieu, SE France

Research paper thumbnail of Calcareous nannofossils, palynomorphs and benthic foraminifera of section L´Arboudeysse

To better understand the linkage between climate and ocean circulation under greenhouse condition... more To better understand the linkage between climate and ocean circulation under greenhouse conditions we have studied calcareous nannofossils, palynomorphs and benthic foraminifera from the Early Albian Oceanic Anoxic Event 1b black shale (OAE 1b) in the Vocontian Basin (SE France). We propose that monsoonal activity resulting from precessional forcing and modulated by eccentricity-driven temperature changes represents the driving factor of OAE 1b formation in low latitudes. With the onset of OAE 1b, increasingly warm and humid conditions, stronger winds and enhanced terrestrial input led to higher surface water productivity. Therefore, increased productivity is an important factor for OAE 1b formation in the Vocontian Basin. However, monsoonally forced productivity changes are a regional climate signal only. The supraregional occurrence of the OAE 1b is probably due to a reduction of deep water formation in the low latitudes under extremely warm and humid conditions, leading to enhanced preservation of organic matter.

Research paper thumbnail of (Fig. 6) Nutrient and temperature index calculated from profile L´Arboudeysse, SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Tarendol, SE France

Research paper thumbnail of Upper Aptian Niveau Kilian range chart of nannofossils in SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile L'Arboudeysse, SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Col_de_Palluel, SE France

Research paper thumbnail of (Appendix) Late Cretaceous calcareous nannofossils of DSDP Holes 80-549 and 80-551

he early late Cretaceous (Cenomanian–early Turonian) is thought to have been one of the warmest p... more he early late Cretaceous (Cenomanian–early Turonian) is thought to have been one of the warmest periods of the Phanerozoic. This period was characterised by tropical sea surface temperatures of up to 36 °C and a pole-to-equator-gradient of less than 10 °C. The subsequent Turonian–Maastrichtian was characterised by a continuous climatic cooling, peaking in the Maastrichtian. This climatic cooling and the resulting palaeoceanographic changes had an impact on planktic primary producer communities including calcareous nannofossils. In order to gain a better understanding of these Cenomanian–Maastrichtian palaeoceanographic changes, calcareous nannofossils have been studied from the proto North Atlantic (Goban Spur, DSDP Sites 549, 551). In order to see potential differences between open oceanic and shelf dwelling nannofossils, the data from Goban Spur have been compared to findings from the European shelf (northern Germany).A total of 77 samples from Goban Spur were studied for calcareous nannofossils revealing abundant (mean 6.2 billion specimens/g sediment) and highly diverse (mean 63 species/sample) nannofossil assemblages. The dominant taxa are Watznaueria spp. (mean 30.7%), Prediscosphaera spp. (mean 18.3%), Zeugrhabdotus spp. (mean 8.3%), Retecapsa spp. (mean 7.2%) and Biscutum spp. (mean 6.6%). The Cenomanian assemblages of both Goban Spur (open ocean) and Wunstorf (shelf) are characterised by elevated abundances of high fertility taxa like Biscutum spp., Zeugrhabdotus spp. and Tranolithus orionatus. Early Turonian to Maastrichtian calcareous nannofossil assemblages of Goban Spur are, however, quite different to those described from European sections. Oceanic taxa like Watznaueria spp., Retecapsa spp. and Cribrosphearella ehrenbergii dominate in Goban Spur whereas the fertility indicators Biscutum spp. and T. orionatus are more abundant in the European shelf assemblages. This shift from a homogeneous distribution of calcareous nannofossils in the Cenomanian towards a heterogeneous one in the Turonian–Maastrich [...]

Research paper thumbnail of (Fig. 10B) Spores and pollen of Cretaceous profile Pré-Guittard, SE France

Research paper thumbnail of (Table 1) Stable carbon and oxygen isotope ratios of planktic and benthic foraminifera in early Maastrichtian sediments of DSDP Hole 44-390A in the North Atlantic

Research paper thumbnail of Planktic/benthic foraminiferal ratio of sediment core Kronsmoor, Late Cretaceous

Research paper thumbnail of Micropaleontological investigation of sediment core Kronsmoor, supplement to: Friedrich, Oliver; Herrle, Jens O; Hemleben, Christoph (2005): Climatic changes in the Late Campanian through Early Maastrichtian: micropaleontological and stable isotopic evidence from an epicontinental sea. Journal of...

Benthic foraminiferal and calcareous nannofossil assemblages, as well as stable isotope data from... more Benthic foraminiferal and calcareous nannofossil assemblages, as well as stable isotope data from the Campanian/Maastrichtian boundary interval (~71.4 to ~70.7 Ma) of the Kronsmoor section (North German Basin), were investigated in order to characterize changes in surface-water productivity and oxygen content at the seafloor and their link to climatic and paleoceanographic changes. A nutrient index based on calcareous nannofossils is derived for the high-latitude, epicontinental North German Basin, reflecting changes in surface-water productivity. Oxygen isotopes of well-preserved planktic foraminiferal specimens of Heterohelix globulosa reflect warmer surface-water temperatures in the lower part of the studied succession and a cooling of up to 2°C (0.5 per mil) in the upper part (after 71.1 Ma). For the lower and warmer part of the investigated succession, benthic foraminiferal assemblages and the calcareous nannofossils indicate well-oxygenated bottom waters and low-surface water ...

Research paper thumbnail of Grey values of ODP Hole 44-390A

Research paper thumbnail of Cretaceous nannofossils in profile Serre Chaitieu, SE France

Research paper thumbnail of Range chart of nannofossils in profile Serre Chaitieu, SE France

Range chart of nannofossils in profile Serre Chaitieu, SE France

Research paper thumbnail of (Fig. 10A) Spores and pollen of Cretaceous profile L´Arboudeysse, SE France

Research paper thumbnail of (Fig. 4) Nannofossil abundance of Cretaceous profile Pré-Guittard, SE France

Research paper thumbnail of (Fig. 8) Nutrient and temperature index calculated from profile Pré-Guittard, SE France

Research paper thumbnail of Abundance of nannoplankton of sediment core Kronsmoor, Late Cretaceous

Research paper thumbnail of Black shales from the Upper Aptian and Lower Albanian of the Volcontian Basin

Calcareous nannoplankton, palynomorph, benthic foraminifera, and oxygen isotope records from the ... more Calcareous nannoplankton, palynomorph, benthic foraminifera, and oxygen isotope records from the supraregionally distributed Niveau Paquier (Early Albian age, Oceanic Anoxic Event 1b) and regionally distributed Niveau Kilian (Late Aptian age) black shales in the Vocontian Basin (SE France) exhibit variations that reflect paleoclimatic and paleoceanographic changes in the mid-Cretaceous low latitudes. To quantify surface water productivity and temperature changes, nutrient and temperature indices based on calcareous nannofossils were developed. The nutrient index strongly varies in the precessional band, whereas variations of the temperature index reflect eccentricity. Since polar ice caps were not present during the mid-Cretaceous, these variations probably result from feedback mechanisms within a monsoonal climate system of the mid-Cretaceous low latitudes involving warm/humid and cool/dry cycles. A model is proposed that explains the formation of mid-Cretaceous black shales through monsoonally driven changes in temperature and evaporation/precipitation patterns. The Lower Albian Niveau Paquier, which has a supraregional distribution, formed under extremely warm and humid conditions when monsoonal intensity was strongest. Bottom water ventilation in the Vocontian Basin was diminished, probably due to increased precipitation and reduced evaporation in regions of deep water formation at low latitudes. Surface water productivity in the Vocontian Basin was controlled by the strength of monsoonal winds. The Upper Aptian Niveau Kilian, which has a regional distribution only, formed under a less warm and humid climate than the Niveau Paquier. Low-latitude deep water formation was reduced to a lesser extent and/or on regional scale only. The threshold for the formation of a supraregional black shale was not reached. The intensity of increases in temperature and humidity controlled whether black shales developed on a regional or supraregional scale. At least in the Vocontian Basin, the increased preservation of organic m [...]

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Serre_Chaitieu, SE France

Research paper thumbnail of Calcareous nannofossils, palynomorphs and benthic foraminifera of section L´Arboudeysse

To better understand the linkage between climate and ocean circulation under greenhouse condition... more To better understand the linkage between climate and ocean circulation under greenhouse conditions we have studied calcareous nannofossils, palynomorphs and benthic foraminifera from the Early Albian Oceanic Anoxic Event 1b black shale (OAE 1b) in the Vocontian Basin (SE France). We propose that monsoonal activity resulting from precessional forcing and modulated by eccentricity-driven temperature changes represents the driving factor of OAE 1b formation in low latitudes. With the onset of OAE 1b, increasingly warm and humid conditions, stronger winds and enhanced terrestrial input led to higher surface water productivity. Therefore, increased productivity is an important factor for OAE 1b formation in the Vocontian Basin. However, monsoonally forced productivity changes are a regional climate signal only. The supraregional occurrence of the OAE 1b is probably due to a reduction of deep water formation in the low latitudes under extremely warm and humid conditions, leading to enhanced preservation of organic matter.

Research paper thumbnail of (Fig. 6) Nutrient and temperature index calculated from profile L´Arboudeysse, SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Tarendol, SE France

Research paper thumbnail of Upper Aptian Niveau Kilian range chart of nannofossils in SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile L'Arboudeysse, SE France

Research paper thumbnail of Composite section of cretaceous nannofossils from profile Col_de_Palluel, SE France

Research paper thumbnail of (Appendix) Late Cretaceous calcareous nannofossils of DSDP Holes 80-549 and 80-551

he early late Cretaceous (Cenomanian–early Turonian) is thought to have been one of the warmest p... more he early late Cretaceous (Cenomanian–early Turonian) is thought to have been one of the warmest periods of the Phanerozoic. This period was characterised by tropical sea surface temperatures of up to 36 °C and a pole-to-equator-gradient of less than 10 °C. The subsequent Turonian–Maastrichtian was characterised by a continuous climatic cooling, peaking in the Maastrichtian. This climatic cooling and the resulting palaeoceanographic changes had an impact on planktic primary producer communities including calcareous nannofossils. In order to gain a better understanding of these Cenomanian–Maastrichtian palaeoceanographic changes, calcareous nannofossils have been studied from the proto North Atlantic (Goban Spur, DSDP Sites 549, 551). In order to see potential differences between open oceanic and shelf dwelling nannofossils, the data from Goban Spur have been compared to findings from the European shelf (northern Germany).A total of 77 samples from Goban Spur were studied for calcareous nannofossils revealing abundant (mean 6.2 billion specimens/g sediment) and highly diverse (mean 63 species/sample) nannofossil assemblages. The dominant taxa are Watznaueria spp. (mean 30.7%), Prediscosphaera spp. (mean 18.3%), Zeugrhabdotus spp. (mean 8.3%), Retecapsa spp. (mean 7.2%) and Biscutum spp. (mean 6.6%). The Cenomanian assemblages of both Goban Spur (open ocean) and Wunstorf (shelf) are characterised by elevated abundances of high fertility taxa like Biscutum spp., Zeugrhabdotus spp. and Tranolithus orionatus. Early Turonian to Maastrichtian calcareous nannofossil assemblages of Goban Spur are, however, quite different to those described from European sections. Oceanic taxa like Watznaueria spp., Retecapsa spp. and Cribrosphearella ehrenbergii dominate in Goban Spur whereas the fertility indicators Biscutum spp. and T. orionatus are more abundant in the European shelf assemblages. This shift from a homogeneous distribution of calcareous nannofossils in the Cenomanian towards a heterogeneous one in the Turonian–Maastrich [...]

Research paper thumbnail of (Fig. 10B) Spores and pollen of Cretaceous profile Pré-Guittard, SE France