Martino GiorgioniUniversity of Brasília | UnB · Institute of Geosciences
Martino Giorgioni
PhD
Cretaceous and Paleogene Paleoceanography.
Neoproterozoic carbonate Sedimentology and Geochemistry
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53
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651
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Citations since 2017
Introduction
Additional affiliations
October 2016 - present
December 2013 - October 2016
December 2012 - November 2013
Publications
Publications (53)
The Ediacaran is a period characterized by the diversification of early animals and extensive neritic carbonate deposits. These deposits are still not well understood in terms of facies and carbon isotope composition (δ13C). In this study we focus on the Tamengo Formation, in southwestern Brazil, which constitutes one of the most continuous and wel...
Rapid onset of subduction tectonics across the western Pacific convergent margins in the early Eocene was followed by a slower phase of margin growth of the proto Tonga-Kermadec subduction system north of Zealandia during a middle Eocene phase to tectonic adjustment. We present new age constraints from International Ocean Discovery Program Expediti...
The Middle Eocene Climatic Optimum (MECO; ~40 Ma), which interrupted for ~500–600 kyr the long-term cooling trend culminating at the Eocene/Oligocene boundary, still requires a comprehensive understanding of the biotic resilience. Here we present a high-resolution integrated foraminiferal and calcareous nannofossil study across the MECO from the ex...
The Tacutu Basin formed from the rifts system that occurred in the Caribbean region during the Mesozoic and culminated with in the opening of the North Atlantic Ocean. It evolved as a half-graben inserted in the Guiana Shield north of the Amazonian Craton. The Pirara Formation corresponds to the rift phase of the evolution of this basin, however th...
A Bacia do Tacutu tem sua origem relacionada aos sistemas de rift que ocorreram durante o Jurássico Superior e culminaram na abertura do Oceano Atlântico Norte. Trata-se de um hemigráben inserido no Escudo das Guianas, no norte do Cráton Amazônico. Os estudos relacionados à Formação Pirara que corresponde à fase de rift ativo dessa bacia são bem es...
The Middle Eocene Climatic Optimum (MECO) is a global warming event that occurred at around 40 Ma and lasted about 500 kyr. We study this event in an abyssal setting of the Tasman Sea, using the IODP Core U1511B-16R, collected during the expedition 371. We analyse magnetic, mineralogical, and chemical parameters to investigate the evolution of the...
Data from International Ocean Discovery Program (IODP) Expedition 371 reveal vertical movements of 1–3 km in northern Zealandia during early Cenozoic subduction initiation in the western Pacific Ocean. Lord Howe Rise rose from deep (~1 km) water to sea level and subsided back, with peak uplift at 50 Ma in the north and between 41 and 32 Ma in the s...
Este estudio presenta una actualización del registro isotópico de la Formación de Tamengo, parte superior del Grupo Corumbá, que se encuentra en la parte meridional del Cinturón Paraguayo. Este trabajo incluye cortes estratigráficos detallados enlazados con la geoquímica de alta resolución δ13C y δ18O de dos yacimientos mineros cercanos a Corumbá (...
Se presenta en este trabajo el análisis paleontológico de 26 especies fósiles muestradas en cinco cortes de las Formaciones de Tamengo y Guaicurus en las regines de Corumbá y Ladário: canteras de Corcal y Laginha, Porto Sobramil, Porto Figueiras y Ecoparque Cacimba. Además, se añaden varias interpretaciones paleoecológicas y ambientales, basadas en...
Se documenta en este resumen la primera aparición de Cloudina carinata Cortijo et al., 2010 en el continente americano. Esta nueva aparición extiende la distribución geográfica de esta especie, hasta ahora restringida a España y Siberia. Se presenta por primera vez en la Formación de Tamengo (Corumbá, Estado de Mato Grosso do Sul, Brasil) la asocia...
Article free download until Dec. 20th at: https://authors.elsevier.com/c/1Z~Tf3BkFSLtTs
Facies analysis, aided by X-ray diffraction, QemScan analysis, U-Pb detrital ages and field geological data are
used in a detailed sedimentary characterization of the Arkose Level, an immature sedimentary unit that occurs
abruptly and discontinuously in the upp...
The Baskil section, located to the west of Elazığ in eastern Turkey, represents deep-marine facies of the Eocene Kırkgeçit Formation, deposited in a wide spectrum of environmental conditions ranging from shelf to basin. The 390 m-thick sequence was deposited at bathyal depths in the Tethys, at the edge of the subsiding Anatolide-Tauride plate and i...
The Middle Eocene Climatic Optimum (MECO) is a global warming event that occurred at about 40 Ma. In comparison to the most known global warming events of the Paleogene, the MECO has some peculiar features that make its interpretation controversial. The main peculiarities of the MECO are a duration of ~500 kyr and a carbon isotope signature that va...
The Baskil section, located to the west of Elazığ in eastern Turkey, represents deep-marine facies of the Eocene Kırkgeçit Formation, deposited in a wide spectrum of environmental conditions ranging from shelf to basin. The 390 m-thick sequence was deposited at bathyal depths in the Tethys, at the edge of the subsiding Anatolide-Tauride plate and i...
Magnetotactic bacteria (MTB) synthesize magnetite and greigite crystals under low oxygen conditions in the water column or uppermost sediment (greigite-producing bacteria are found below the oxic-anoxic transition). Dissolved iron and oxygen contents in local environments are known to be limiting factors for the production and preservation of bioge...
Sedimentary records of the Early Cenozoic indicate a series of events with climatic and carbon cycle variability known as hyperthermals. A ~350-kyr-long event of environmental disruption during the Paleocene, not described before and here named Selandian–Thanetian Transition Event (STTE), has been recognized and well constrained in the western Teth...
The Itapucumi Group is recognized worldwide due to its well- preserved Ediacaran fossil assemblage. Despite its paleontological importance, this unit remains as the least studied South
American Neoproterozoic sedimentary succession. Recorded at northern Paraguay, the Itapucumi Group is a ~400 m-thick siliciclastic and carbonate succession deposited...
The brachiopod fauna from the Middle Triassic beds of the Socotra Island, collected along the Ras Momi log, consists basically of four species, here described: Nudirostralina mutabilis (Stoliczka, 1866), Lepismatina lilangensis (Stoliczka, 1866), Spirigerellina stoliczkai (Bittner, 1899), Adygella socotrana sp. nov. Additional, very rare, species a...
Minerals in stratigraphic sections are valuable tools for reconstructing past environmental conditions. Given the state of preservation of clay minerals, it is possible to determine under what conditions they formed, which provides clues about continental weathering (inherited minerals) and geochemical conditions in the water column or pore waters...
International Ocean Discovery Program (IODP) Expedition 371 drilled six sites in the Tasman Sea of the southwest Pacific between 27 July and 26 September 2017. The primary goal was to understand Tonga-Kermadec subduction initiation through recovery of Paleogene sediment records. Secondary goals involved understanding regional oceanography and clima...
International Ocean Discovery Program (IODP) Expedition 371 drilled six sites in the Tasman Sea of the southwest Pacific between 27 July and 26 September 2017. The primary goal was to understand Tonga-Kermadec subduction initiation through recovery of Paleogene sediment records. Secondary goals involved understanding regional oceanography and clima...
Isotopic mass balance models are employed here to study the response of carbon isotope composition (δ¹³C) of the ocean-atmosphere system to amplitude-modulated perturbations on Milankovitch time scales. We identify a systematic phase distortion, which is inherent to a leakage of power from the carrier precessional signal to the modulating eccentric...
The progressive closure of the Neotethys Ocean had a profound impact on the ocean- climate system during the Cenozoic. In this perspective, Turkey represents a key area for studying the climate evolution during the Eocene, because it was located at the gateway between the Neotethys and the At- lantic Ocean. Here, we present a high-res- olution inte...
The Ceará Plateau offshore Fortaleza holds some particular characteristics when compared to the other seamounts of the Brazilian Equatorial Margin (BEM). Not only it is the largest and the closest to the continent, it is also located at the boundary between the continental and the oceanic crusts, while all the others seamounts along the BEM are loc...
The pelagic Marne a Fucoidi Formation from the Umbria-Marche Basin (Central Italy) is one of the best-preserved deep-marine archives of the Aptian-Albian. Frequent changes in lithology, from black to green and red marlstones and limestones, record fluctuating oceanographic and climatic conditions during the deposition of these sediments. Here, the...
The Middle Eocene Climatic Optimum (MECO) event at ~40 Ma was a greenhouse warming which indicates an abrupt reversal in long-term cooling through the middle Eocene. Here, we present environmental and rock magnetic data from sedimentary successions from the Indian Ocean (ODP Hole 711A) and eastern NeoTethys (Monte Cagnero section - MCA). The high-r...
The diversity of eukaryotic shapes and forms experienced a massive increase in the Neoproterozoic, and several models have proposed links between these evolutionary events and the large carbon isotopic excursions of the Cryogenian and Ediacaran. The Bitter Springs Anomaly (BSA), dated to ~800 Ma, is the oldest of the large Neoproterozoic excursions...
We established a new high-resolution carbonate carbon isotope record of
the Albian interval of the Marne a Fucoidi Formation (Central Apennines,
Italy), which was deposited on the southern margin of the western Tethys
Ocean. Bulk carbonate sampled with 10-15 cm spacing was used for the
construction of a continuous carbon isotope curve through the A...
The Aptian Oceanic Anoxic Event 1a (OAE1a) is preceded by a prominent negative C-isotope excursion (NCIE) attributed to major volcanism on the Ontong Java plateau that is supposed to lead to a pCO2 increase and a climate change. Lower Aptian sporomorph assemblages in two pelagic sections from the southern Tethys margin (N-Italy) were analysed in or...
During the Cretaceous, several major volcanic events occurred that initiated climate warming, altered marine circulation and increased marine productivity, which in turn often resulted in the widespread black shale deposits of the Oceanic Anoxic Events (OAE). In the sediments underlying the early Aptian OAE1a black shales, a prominent negative carb...
During Cretaceous times, several intense volcanic episodes are proposed as trigger for episodic climate warming, for changes in marine circulation patterns and for elevated marine productivity, which resulted in the widespread black shale deposits of the Oceanic Anoxic Events (OAE). In the sediments underlying the early Aptian OAE1a black shales, a...
During the mid-Cretaceous intense and widespread volcanism induced a
high atmospheric CO2 concentration and, consequently, a very strong
greenhouse effect (Bice & Norris, 2002). Opening and closing of
oceanic gateways had an impact on paleoceanography (Poulsen et al, 1998;
Poulsen et al, 2001). Global temperature and sea level reached the
highest l...
The Early Aptian C-cycle perturbation leading to Oceanic Anoxic Event (OAE) 1a
Projects
Projects (2)
Ostracod carapaces from the Romualdo Formations are well known for their pristine, detailed preservation - such that their isotopic composition is representative of paleoenvironmental conditions during their lives. The objective of this project is to establish absolute dating measurements and detailed paleoenvironmental reconstructions for strata of that formation, as well as calling attention for their potential as exposition materials at the Cariri Regional Paleontological Museum (MPPCN).
This project will apply paleomagnetic, micropaleontological, mineralogical and chemical analyses on carbonate sediments, in order to perform detailed paleocenaographic reconstructions of the evolution of the Brazilian Equatorial Margin (BEM) for the Eocene-Oligocene period and compare this results with the modern oceanographic setting. The Eocene-Oligocene is a key period in Earth’s climate history and the period that occurred the major climatic changes in the Cenozoic, like the glaciation of Antarctica. High-resolution rock magnetic properties, microfossils and minerals associacions, and isotopes records will be obtained from the BEM and compared with several data in different part of the world. A robust magneto-bio-chemo-stratigraphic reference curve will be established and the major paleoceanographic and paleoclimatic events will be characterized from local to global scale. It expected to obtain an enhanced reconstruction of the Eocene-Oligocene climatic history and new insights on the mechanisms that drove the global climate during the transition from greenhouse to icehouse conditions at that time. This Project proposes to obtain and examine high-quality, continuous stratigraphic records of magnetic properties, microfossils, minerals and isotopes from targeted time intervals to better understand (1) how ocean circulation and carbon cycle behaved during warmer climates, and (2) how physical and biological systems responded to elevated and varying levels of atmospheric CO2. This reconstruction will be compared with today’s conditions and the recent climatic evolution in the same basins. During the oceanographic expedition, with the Alpha Crucis of the IO-USP, will be collected piston cores from the continental slope and shelf off northeastern Brazil. We aim to perform rock magnetic, paleomagnetic, clay, micropaleontological and isotopes analyses on the collected cores in order to study the effects of climatic and oceanographic changes in the BEM Basins of the marine sediments. The expected major outcomes are: 1) stratigraphical characterization of the marine sediments sequences from the BEM Basins, 2) study of the magnetotactic bacterial activity, the movement of sediments and the clay floculations in the different marine settings in relation to the presence of different isotopes and micro-organisms, 3) identify and relate any trends in the temporal and spatial distribution of the magnetic and clay minerals in the BEM basins to known the active sedimentary processes with climate, oceanography and human activity, 4) study the relation of the variations in the ocean circulation and climate in millenar scale. An integrated data-model science approach will offer new insight into the onset, early evolution, and subsequent behavior of oceans and ice sheets in Antarctica in response to underlying tectonic change, landscape evolution, orbital forcing, and varying levels of atmospheric CO2. Particular attention will be given to (a) the link between tectonic and oceanographic changes; (b) the link between orbital forcing, C-cycle, and climate; (c) characterization of the rapid “hyperthermals”; (d) and calibration of the Milankovitch orbital signal between isotopes, magnetic properties, clay and microfossils in sedimentary archives of a period when the concentration of atmospheric CO2 was very similar to the expectd for the next century.
