Poseidon Cruise POS514

Team members Ozren Hasan and Nikolina Ilijanić are participating on the scientific cruise in the Adriatic Sea on research vessel (RV) Poseidon (Kiel, Germany). Cruise started from Heraklion on Crete on 27th of May and will end on 16th June in Dubrovnik. They are experiencing the off-shore life on a 60 m-ship, which includes drilling with gravity corer (3, 5 or 8 m core tube), sampling of the sea-surface sediments using multi corer, Frahm corer, box corer and Van Veen grab corer, sampling of the plankton at various depth and measurements of conductivity, temperature, oxygen and fluorescence of the sea water column. The cruise entitled „Micropaleontology, Actuopaleontology, and Environmental Baseline Study of the Holocene to latest Pleistocene in the northern and eastern Adriatic Sea basin“ (Code name: APTA: Actuo-Paleontology Trans-Adriatic) is organized by the chief scientist Hartmut Schulz from the University of Tübingen, in coordination with Slobodan Miko from the Croatian Geological Survey. The 21 days-long cruise is financed by the German Research Foundation (DFG). The scientific crew make James Nebelsick and Tobias Grun from University of Tübingen, Petra Heinz, Julia Wukovits, Patrick Bukenberger and Martin Zuschin from Vienna University, Guiseppe Siena and Nydia Catalina Reyes Suarez from National Institute of Oceanography in Trieste and Ozren Hasan and Nikolina Ilijanić from Croatian Geological Survey.

CTD (Coductivity Temperature Depth) is deployed routinely at most stations at variable depths, it has a bulk flourescence sensor and bottles for water sampling. MultiNet (5 nets) is also deployed at variable depths (ie 100 and 700 m) for plankton sampling using 100 and 63 µm nets. Samples are immediately deep frozen and stored.

Ozren Hasan and Nikolina Ilijanić are responsible for operating the Gravity Corer (GC), heavy instrument that includes heavy work setting up of variable 3 and 5 m core tubes up to 10 m total length. Cores are immediately cut into 1m-sections, capped, sealed, labeled and stored/cooled to be opened in Tübingen. Short cores (< 50 cm) are collected using the Multi Corer (MUC) able to collect as much as 8 cores in the same time. Only the best are photographed, sliced by 1 or 2 cm interval and packed into plastic bags. On selected sites best sediment surface samples are collected (0-1, 1-2 cm) and also taken for incubation foraminifera experiments on board. Frahm Corer is used to collect up to 100 cm-long cores in shallower depths, the cores are photographed, sliced and packed in plastic bags. Van Veen Grab Corer is deployed mostly at shallow depths, robust, effective and it is used for instance surface and shallow benthos sieved/washed. Box Corer (BC) is used to collect up to 20 cm-long cores with well preserved sediment surface. Cores are photographed and sliced, than packed into plastic bags.

We wish them succesfull cruise, nice weather and lots of cores and sediments from the Adriatic Sea!

Fig. 1. Operating the Gravity Corer, Ozren Hasan and Hartmut Schulz on the Bridge and slicing the cores into 1m-sections.

Fig. 2. MultiCorer sampling, handled by the whole team.

Fig. 3. Setting up Frahm Corer and taking the core, by Tobias Grun, James Nebelsick, Hartmut Schulz and Martin Zuschin.

Fig. 4. Box corer sampling by Tobias Grun.

Fig. 5. Grab sampling.

Fig. 6. Photographing the multi corer and Frahm corer sediment cores, ready to be sampled (sliced by 1 or 2 cm interval) and washing of grab samples, work of the whole team, under supervision of chief scientist Hartmut Schulz.

Fig. 7. CTD, operated by Guiseppe Siena and Nydia Catalina Reyes Suarez.

Fig. 8. MultiNets, operated by Petra Heinz, Julia Wukovits and Patrick Bukenberger.

Fig. 9. Night work and taking samples from the grab corer, by James Nebelsick and Tobias Grun.

 

 

Advertisements
Posted in Uncategorized | Leave a comment

Radionica LoLADRIA 2017

U sklopu LoLADRIA projekta organizira se radionica o istraživanju potopljenih paleookoliša u Salima na Dugom otoku, od 28. do 30. lipnja 2017. godine. Radionica je namijenjenja studentima diplomskih studija, doktorandima i mladim istraživačima. Detalje možete pročitati u sljedećim prilozima:

loladria2017_final

program_radionica_LoLADRIA_telascica2017

 

 

Posted in Uncategorized | Leave a comment

Ozren achieved a doctoral degree

Recently, our colleague Ozren Hasan defended his doctoral thesis under the panel of Professors Slobodan Miko, Goran Durn and Mladen Juračić. His work is summed up under the title “Paleookolišna rekonstrukcija slivova Karinskoga mora, Novigradskoga mora i Velebitskoga kanala tijekom holocena” (“Paleoenvironmental reconstruction of the Karin Sea, Novigrad Sea and the Velebit Channel catchments during the Holocene”). In excellent presentation he showed a completely new data that are the result of the work of LoLADRIA project, combined geophysical research with sediment cores. The geophysical research was contucted in collaboration with the Marine Geology and Physical Oceanography Laboratory from Uni. Patras and Prof. G. Papatheodorou. The research in Novigrad Sea area represents this type of  approach for the first time in Croatian Quaternary science. The LoLADRIA team is very proud of him and wish all the best in his future work and research! Congrats, Ozren!

Posted in Uncategorized | Leave a comment

Losinj Channel core subsampling

Detailed subsampling of cores retrieved in Losinj Channel has been performed for radicarbon dating and foraminifera assemblage determination. The analyzed cores LK-12 and LK-13 were collected from the depths of 64 and 12 m bsl, respectively. We are expecting interesting results about the timing of marine instrusion in Losinj Channel and new data for Deas PhD thesis!

img_9361

img_9365   mozaik2 euromex_9   euromex_18

Posted in Uncategorized | Leave a comment

Season’s Greetings from LoLADRIA team

greetings_vece_lila_eng_2017

Image | Posted on by | Leave a comment

The Koločep kanal and Elaphiti islands/Mljet Island marine geophysical survey

In the early 2016, began the preparation for the research of the new sites in LoLADRIA project – southern Dalmatia. The location is the huge canal in Dubrovnik archipelago, Koločepski kanal. It is surrounded by the islands Lopud, Koločep and Šipan (Elaphiti islands; https://en.wikipedia.org/wiki/Elaphiti_Islands), and several small islands toward Pelješac peninsula (Olipa and Jakljan islands).

This elongate submerged karst depression is characterized by the numerous submarine springs with  groundwater flowing from sinkholes (ponors) along the Trebišnjica river in Bosnia and Herzegovina. During the late Pleistocene  freshwater from the karst springs filled the silled basin (-50 m), hopefully forming a lake (it’s what we are looking for). At the end of April 2016, our project members from the Laboratory of Marine Geology and Physical Oceanography , University of Patras, (George, Dimitris, Maria, Nikos and Xenofon) and HGI_CGS (Slobodan, Ozren and Nikolina) spent one week surveying Koločepski kanal and the submerged river valley between Mljet island and Olipa island. Research vessel, Božja providnost II, was struggling with the strong bura winds during the geophysical survey (armed with an 3.5 kHz ORE Pinger with 4 transducers, Geopulse transceiver/receiver, Digital Acquisition System Triton Imaging Inc, and side scan sonar system: G&G. 272 TD towfish ),  but the results were outstanding. Very deep penetration of sub-bottom profiler allowed identification of 50 m of sediment sequences in the kanal. Fascinating sediment structures, sand plateaus, tectonics, river valleys  and erosion events were revealed. This research will give detail geomorphological evidence for reconstruction of paleolandscape during the Late Pleistocene and the last deglaciation. We will start coring in September 2016.

Posted in Uncategorized | Leave a comment

XRF core scanning in ISMAR, Bologna

Last month, team member Dea Brunović spent 10 days at Institute of Marine Science (CNR-ISMAR), Bologna. Hosts, Annamaria Correggiari and Stefano Miserocchi have vast experience researching western part of the Adriatic Sea, which is well studied, unlike its eastern part that still remains partly unexplored. Therefore, their advices and help was invaluable for our study.

The main aim of this visit was XRF-core scanning of sediment cores from northern part of Eastern Adriatic Sea. Cores from Lošinj Channel, collected in September 2015 (https://loladria.wordpress.com/2015/10/13/fieldwork-in-the-losinj-bay/), show geochemical evidence od paleoenvironmental development of the area.  Especially interesting was core collected from the depth of 63 m, where we have alteration of sediments deposited in the sea and in the freshwater lake that existed during the Last Glacial Maximum. Generally, this research will improve our knowledge and help us track sea-level changes along the eastern coast of the Adriatic Sea and complement all the existing data about the sea-level rise in the Adriatic Sea. Additionally, two cores from nearby freshwater lake Vrana were also analyzed, as well as core collected in Meline embayment (Island of Krk). They will provide complete insight into environmental evolution of the northern part of the Eastern Adriatic Coast.

20160314_104751

Fig. 1. Avaatech XRF Core Scanner during the measurement of splitted sediment core section in CNR-ISMAR Bologna.

vrana

Fig. 2. Lake Vrana sediment core image, section 147-276 cm, with the transition to the brighter sediment.

Vrana-2_Lab,ms,xrf_2

Fig. 3. XRF results for the core from Lake Vrana on the Island of Cres.

lk-12p, novo2

 

Fig. 4. Core LK-12P image and some gochemical parameters, collected in Lošinj Channel, that shows transition from marine (bottom) to lacustrine sediments (top).

20160318_084547

Fig. 5. CNR – National Research Council of Italy in Bologna.

Posted in Uncategorized | Leave a comment

Novigradsko more seabed geology: Ozren’s geophysical story

At the beginning of the April, our team member Ozren Hasan spent 9 days at the Marine Geology and Physical Oceanography Laboratory of the University of Patras. During that period, with immense help from the Patras team (especially George Papatheodorou, Xenofodas Dimas and Maria Garaga) more than 114 km of the geophysical data were interpreted. The data was collected at Novigrad Sea and Karin Sea area (central part of eastern Adriatic coast) during April 2015, also by the Patras team (https://loladria.wordpress.com/2015/04/23/geophyisical-survey-continued-in-novigrad-sea/). For the data acquisition during the survey 3,5 kHz pinger (Ore) was used coupled with ELAC echosounder and E.G. & G. sidescan.

Based on the subbottom profiler data interpreted using Triton SB-InterpreterTM it was possible to define four major units throughout the whole study area (marine Holocene sediments, freshwater marsh/lake sediments, pre-holocene clastic sediments and carbonate bedrock) (Figure 1). Marine sediments are characterized by lack of visible layers, indicating a very uniform sedimentation. Contact with older clastic unit is mainly erosional, with many incised channels. Irregular erosional surface was mainly filled and flattened by terrestrial and freshwater sediments deposited before sea-level rise. Also, several sedimentary units with limited span were indicated, like deltaic sediments of the Zrmanja river and channel-levee complexes. Depth and thickness maps of defined units were created (Figure 2).

profil

Figure 1. Example of the interpreted subbottom profiler data from the Novigrad sea. Unit A – marine sediments, Unit B – pre-Holocene clastic sediments.

a)karta1  b) karta2Figure 2. Depth (a) and thickness (b) of the marine sediments in the study area.

Density of the acquired data allowed a production of quality 3D model of the studied area, showing the evolution of the sedimentary basin, especially since the beginning of the Holocene.

a) 3d model1 b) 3d model2Figure 3. a) 3 dimensional distribution of the subbottom profile data; b) 3 dimensional model of the eroded pre-Holocene surface of the studied area.

Posted in Uncategorized | Leave a comment

Alone on the water and in the mud…

Posted in Uncategorized | Leave a comment

Preparing cores for XRF core scanning

The last two weeks was very dynamic and very intense for the team in our preparing laboratory, since the cores were prepared for XRF core scanning this week in Bologna. Dea Brunović will do XRF core scanning of the cores from Lošinjski Canal for her PhD for the next two weeks in Institute of Marine Sciences (ISMAR) in Bologna, Italy. Before that, she did for around 30 m of the cores preparation protocol – initial core description, smear slides and photodocumentation of the sediment core. Below you can see how we do it!

IMG_3525

Fig. 1. Dea & Dragana in the lab, working on the sediment core.

Film on You Tube:

 

Posted in Uncategorized | Leave a comment