Welcome to the AMG lab

Latest research in Alfredo Martínez García's laboratory at the Max Planck Institute for Chemistry (MPIC)

The AMG lab studies the evolution of the Earth system including its physical, chemical and biological components. We combine the study of modern processes with the analysis of past climatic and environmental archives such as marine and lake sediment sequences, deep and shallow water scleractinian corals, speleothems, tooth enamel and ice cores using a variety of geochemical techniques, including organic biomarkers, and stable isotopes of Hydrogen, Carbon, Nitrogen and Oxygen. 

Latest Research Highlights

Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic

April 26, 2019

In a study published in the journal Science we reconstruct the evolution of the Nitrogen cycle in the early Cenozoic using the nitrogen isotopic composition of foraminifera-bound organic matter . We show that changes in continental configuration resulted in expanded water column suboxia and denitrification before 57 million years ago. Between 57 and 50 Ma ago, oxigenation increased and denitrification rate dropped. We suggest that these changes were linked to the collision of India and Asia and the circulation changes that occurred as a result. Later, at the Eocene/Oligocene transition, the isotopic composition changed further in response to a fall in sea level as global cooling caused ice sheets to grow. These results indicate that the N cycle experienced major long-term changes in response to tectonic and climatic changes over the Cenozoic.


©2019 by Alfredo Martínez García