scholarly journals A pronounced spike in ocean productivity triggered by the Chicxulub impact

2021 ◽  
Author(s):  
Julia Brugger ◽  
Georg Feulner ◽  
Matthias Hofmann ◽  
Stefan Petri
Keyword(s):  
Ocean Productivity ◽  
Chicxulub Impact

Chicxulub impact event; computer animations and paper models

1997 ◽  
Author(s):  
T.R. Alpha ◽  
J.P. Galloway ◽  
S.W. Starratt
Keyword(s):  
Impact Event ◽  
Computer Animations ◽  
Chicxulub Impact

Chicxulub impact event; computer animations and paper models

1997 ◽  
Author(s):  
T.R. Alpha ◽  
John P. Galloway ◽  
S.W. Starratt
Keyword(s):  
Impact Event ◽  
Computer Animations ◽  
Chicxulub Impact

Chicxulub impact: The origin of reservoir and seal facies in the southeastern Mexico oil fields

Geology ◽  
2000 ◽  
Vol 28 (4) ◽  
pp. 307-310 ◽  
Author(s):  
José M. Grajales Nishimura ◽  
Esteban Cedillo-Pardo ◽  
Carmen Rosales-Domínguez ◽  
Dante J. Morán-Zenteno ◽  
Walter Alvarez ◽  
...  
Keyword(s):  
Oil Fields ◽  
Chicxulub Impact

QUANTIFYING PGES IN THE CHICXULUB IMPACT BASIN

2018 ◽  
Author(s):  
D. Burney ◽  
◽  
C.R. Neal ◽  
David A. Kring ◽  
Sean P.S. Gulick ◽  
...  
Keyword(s):  
Chicxulub Impact

3D gravity modelling of the Chicxulub impact structure

2001 ◽  
Vol 49 (6) ◽  
pp. 599-609 ◽  
Author(s):  
Jörg Ebbing ◽  
Peter Janle ◽  
Jannis Koulouris ◽  
Bernd Milkereit
Keyword(s):  
Impact Structure ◽  
Gravity Modelling ◽  
3D Gravity ◽  
Chicxulub Impact

scholarly journals Ocean resurge-induced impact melt dynamics on the peak-ring of the Chicxulub impact structure, Mexico

2021 ◽  
Author(s):  
Felix M. Schulte ◽  
◽  
Axel Wittmann ◽  
Stefan Jung ◽  
Joanna V. Morgan ◽  
...  
Keyword(s):  
Impact Structure ◽  
Physical Processes ◽  
Hydrothermal Conditions ◽  
Chemical Examination ◽  
Impact Melt ◽  
Target Rock ◽  
Single Process ◽  
Chicxulub Impact ◽  
The Impact

AbstractCore from Hole M0077 from IODP/ICDP Expedition 364 provides unprecedented evidence for the physical processes in effect during the interaction of impact melt with rock-debris-laden seawater, following a large meteorite impact into waters of the Yucatán shelf. Evidence for this interaction is based on petrographic, microstructural and chemical examination of the 46.37-m-thick impact melt rock sequence, which overlies shocked granitoid target rock of the peak ring of the Chicxulub impact structure. The melt rock sequence consists of two visually distinct phases, one is black and the other is green in colour. The black phase is aphanitic and trachyandesitic in composition and similar to melt rock from other sites within the impact structure. The green phase consists chiefly of clay minerals and sparitic calcite, which likely formed from a solidified water–rock debris mixture under hydrothermal conditions. We suggest that the layering and internal structure of the melt rock sequence resulted from a single process, i.e., violent contact of initially superheated silicate impact melt with the ocean resurge-induced water–rock mixture overriding the impact melt. Differences in density, temperature, viscosity, and velocity of this mixture and impact melt triggered Kelvin–Helmholtz and Rayleigh–Taylor instabilities at their phase boundary. As a consequence, shearing at the boundary perturbed and, thus, mingled both immiscible phases, and was accompanied by phreatomagmatic processes. These processes led to the brecciation at the top of the impact melt rock sequence. Quenching of this breccia by the seawater prevented reworking of the solidified breccia layers upon subsequent deposition of suevite. Solid-state deformation, notably in the uppermost brecciated impact melt rock layers, attests to long-term gravitational settling of the peak ring.

scholarly journals Manganese co-limitation of phytoplankton growth and major nutrient drawdown in the Southern Ocean

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Thomas J. Browning ◽  
Eric P. Achterberg ◽  
Anja Engel ◽  
Edward Mawji
Keyword(s):  
Southern Ocean ◽  
Drake Passage ◽  
Phytoplankton Growth ◽  
South American ◽  
Cold Temperatures ◽  
Continental Shelves ◽  
Ocean Productivity ◽  
Major Nutrient ◽  
Essential Function ◽  
Glacial Periods

AbstractResidual macronutrients in the surface Southern Ocean result from restricted biological utilization, caused by low wintertime irradiance, cold temperatures, and insufficient micronutrients. Variability in utilization alters oceanic CO2 sequestration at glacial-interglacial timescales. The role for insufficient iron has been examined in detail, but manganese also has an essential function in photosynthesis and dissolved concentrations in the Southern Ocean can be strongly depleted. However, clear evidence for or against manganese limitation in this system is lacking. Here we present results from ten experiments distributed across Drake Passage. We found manganese (co-)limited phytoplankton growth and macronutrient consumption in central Drake Passage, whilst iron limitation was widespread nearer the South American and Antarctic continental shelves. Spatial patterns were reconciled with the different rates and timescales for removal of each element from seawater. Our results suggest an important role for manganese in modelling Southern Ocean productivity and understanding major nutrient drawdown in glacial periods.

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