scholarly journals The environmental and evolutionary history of Lake Ohrid (FYROM/Albania): Interim results from the SCOPSCO deep drilling project

2016 ◽  
Author(s):  
Bernd Wagner ◽  
Thomas Wilke ◽  
Alexander Francke ◽  
Christian Albrecht ◽  
Henrike Baumgarten ◽  
...  
Keyword(s):  
Environmental Change ◽  
De Novo ◽  
High Water ◽  
Lake Ohrid ◽  
Climatic Impact ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Refugial Area ◽  
Drilling Project

Abstract. This study reviews and synthesises existing information generated within the SCOPSCO ("Scientific Collaboration on Past Speciation Conditions in Lake Ohrid") deep drilling project. The four main aims of the project are to infer (i) the age and origin of Lake Ohrid (Former Yugoslav Republic of Macedonia/Republic of Albania), (ii) its regional seismotectonic history, (iii) volcanic activity and climate change in the central northern Mediterranean region, and (iv) the drivers of biodiversity and endemism. The Ohrid basin formed by transtension during the Miocene, opened during the Pliocene and Pleistocene, and the lake established de novo in the still relatively narrow valley between 1.9 and 1.3 Myr ago. The lake history is recorded in a 584 m long sediment sequence, which was recovered within the framework of the International Continental Scientific Drilling Program (ICDP) from the central part (DEEP site) of the lake in spring 2013. To date, 50 tephra and crypto-tephra horizons have been found in the upper 460 m of this sequence. Tephrochronology and tuning biogeochemical proxy data to orbital parameters revealed that the upper 247.8 m represent the last 637 kyr. The multi-proxy dataset covering these 637 kyr indicates long-term variability, with a change from cooler and wetter to drier and warmer glacial and interglacial periods around 300 ka. Short-term environmental change caused, for example, by tephra deposition or the climatic impact of millennial-scale Dansgaard-Oeschger and Heinrich events are superimposed on the long-term trends. Evolutionary studies on the extant fauna indicate that Lake Ohrid was not a refugial area for regional freshwater animals. This differs from the surrounding catchment, where the mountainous setting with relatively high water availability provided a refugial area for temperate and montane trees during the relatively cold and dry glacial periods. Although Lake Ohrid experienced significant environmental change over the last 637 kyr, preliminary molecular data from extant microgastropod species do not indicate significant changes in diversification rate during this period. The reasons for this constant rate remain largely unknown, but a possible lack of environmentally induced extinction events in Lake Ohrid and/or the high resilience of the ecosystems may have played a role.

scholarly journals The environmental and evolutionary history of Lake Ohrid (FYROM/Albania): interim results from the SCOPSCO deep drilling project

2017 ◽  
Vol 14 (8) ◽  
pp. 2033-2054 ◽  
Author(s):  
Bernd Wagner ◽  
Thomas Wilke ◽  
Alexander Francke ◽  
Christian Albrecht ◽  
Henrike Baumgarten ◽  
...  
Keyword(s):  
Environmental Change ◽  
De Novo ◽  
Set Covering ◽  
Lake Ohrid ◽  
Climatic Impact ◽  
Deep Drilling ◽  
Proxy Data ◽  
Data Set ◽  
Drilling Project

Abstract. This study reviews and synthesises existing information generated within the SCOPSCO (Scientific Collaboration on Past Speciation Conditions in Lake Ohrid) deep drilling project. The four main aims of the project are to infer (i) the age and origin of Lake Ohrid (Former Yugoslav Republic of Macedonia/Republic of Albania), (ii) its regional seismotectonic history, (iii) volcanic activity and climate change in the central northern Mediterranean region, and (iv) the influence of major geological events on the evolution of its endemic species. The Ohrid basin formed by transtension during the Miocene, opened during the Pliocene and Pleistocene, and the lake established de novo in the still relatively narrow valley between 1.9 and 1.3 Ma. The lake history is recorded in a 584 m long sediment sequence, which was recovered within the framework of the International Continental Scientific Drilling Program (ICDP) from the central part (DEEP site) of the lake in spring 2013. To date, 54 tephra and cryptotephra horizons have been found in the upper 460 m of this sequence. Tephrochronology and tuning biogeochemical proxy data to orbital parameters revealed that the upper 247.8 m represent the last 637 kyr. The multi-proxy data set covering these 637 kyr indicates long-term variability. Some proxies show a change from generally cooler and wetter to drier and warmer glacial and interglacial periods around 300 ka. Short-term environmental change caused, for example, by tephra deposition or the climatic impact of millennial-scale Dansgaard–Oeschger and Heinrich events are superimposed on the long-term trends. Evolutionary studies on the extant fauna indicate that Lake Ohrid was not a refugial area for regional freshwater animals. This differs from the surrounding catchment, where the mountainous setting with relatively high water availability provided a refuge for temperate and montane trees during the relatively cold and dry glacial periods. Although Lake Ohrid experienced significant environmental change over the last 637 kyr, preliminary molecular data from extant microgastropod species do not indicate significant changes in diversification rate during this period. The reasons for this constant rate remain largely unknown, but a possible lack of environmentally induced extinction events in Lake Ohrid and/or the high resilience of the ecosystems may have played a role.

scholarly journals Why deep drilling in the Colônia Basin (Brazil)?

2015 ◽  
Vol 20 ◽  
pp. 33-39 ◽  
Author(s):  
M.-P. Ledru ◽  
W. U. Reimold ◽  
D. Ariztegui ◽  
E. Bard ◽  
A. P. Crósta ◽  
...  
Keyword(s):  
Tropical Rainforest ◽  
Sao Paulo ◽  
South American ◽  
São Paulo ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Southwestern Margin ◽  
The University ◽  
The City ◽  
Drilling Project

Abstract. The Colônia Deep Drilling Project held its first International Continental Scientific Drilling Program (ICDP) workshop in September 2014 at the University of São Paulo (Brazil). Twenty-seven experts from six countries discussed the feasibility and the expectations of a deep drilling in the structure of Colônia located at the southwestern margin of the city of São Paulo. After presenting the studies performed at the site during the last decades, participants focused on the objectives, priorities and detailed planning for a full deep-drilling proposal. An excursion to the site and new auger coring showed the importance of the Colônia site for studying the evolution of a tropical rainforest and to evaluate the interplay between the South American summer monsoon, the Intertropical Convergence Zone (ITCZ) and the southern Westerlies belt during the last 5 million years. In addition, deep drilling will eventually solve the still unresolved issue of the origin of the structure of Colônia as a result of meteorite impact or endogenous processes.

Integrated deep drilling, coring, downhole logging, and data management in the Chicxulub Scientific Drilling Project (CSDP), Mexico

2004 ◽  
Vol 39 (6) ◽  
pp. 791-797 ◽  
Author(s):  
Lothar Wohlgemuth ◽  
Eckhard Bintakies ◽  
Jochem Kück ◽  
Ronald Conze ◽  
Ulrich Harms
Keyword(s):  
Data Management ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Drilling Project

scholarly journals The Towuti Drilling Project: paleoenvironments, biological evolution, and geomicrobiology of a tropical Pacific lake

2016 ◽  
Vol 21 ◽  
pp. 29-40 ◽  
Author(s):  
James M. Russell ◽  
Satria Bijaksana ◽  
Hendrik Vogel ◽  
Martin Melles ◽  
Jens Kallmeyer ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Biological Evolution ◽  
Drilling Depth ◽  
Scientific Drilling ◽  
System A ◽  
Lake Floor ◽  
A Chain ◽  
Lake Towuti ◽  
Drilling Project

Abstract. The Towuti Drilling Project (TDP) is an international research program, whose goal is to understand long-term environmental and climatic change in the tropical western Pacific, the impacts of geological and environmental changes on the biological evolution of aquatic taxa, and the geomicrobiology and biogeochemistry of metal-rich, ultramafic-hosted lake sediments through the scientific drilling of Lake Towuti, southern Sulawesi, Indonesia. Lake Towuti is a large tectonic lake at the downstream end of the Malili lake system, a chain of five highly biodiverse lakes that are among the oldest lakes in Southeast Asia. In 2015 we carried out a scientific drilling program on Lake Towuti using the International Continental Scientific Drilling Program (ICDP) Deep Lakes Drilling System (DLDS). We recovered a total of  ∼ 1018 m of core from 11 drilling sites with water depths ranging from 156 to 200 m. Recovery averaged 91.7 %, and the maximum drilling depth was 175 m below the lake floor, penetrating the entire sedimentary infill of the basin. Initial data from core and borehole logging indicate that these cores record the evolution of a highly dynamic tectonic and limnological system, with clear indications of orbital-scale climate variability during the mid- to late Pleistocene.

scholarly journals Superdeep Tests and Experiments at 9.1 km and 4 km

2016 ◽  
Vol 2 ◽  
Author(s):  
Ulrich Harms ◽  
Jochem Kück
Keyword(s):  
Large Diameter ◽  
Crystalline Basement ◽  
Deep Drilling ◽  
In Situ Tests ◽  
Scientific Drilling ◽  
Basement Rocks ◽  
The Town ◽  
Continental Deep Drilling ◽  
Drilling Project

The Continental Deep Drilling Program of Germany (in German: Kontinentales Tiefbohrprogramm der Bundesrepublik Deutschland, abbreviated as KTB) was a scientific drilling project near the town of Windischeschenbach, Bavaria. The KTB Depth Laboratory comprises two 9.1 km and 4 km deep, water-filled boreholes in crystalline basement rocks just 200 meters apart from each other. Available equipment such as cables, winches, geophysical borehole tools as well as workshops and office infrastructure allows for in-situ tests and experiments at different pressure and temperature conditions. The two stable wells are large-diameter steel-cased and have been geophysically monitored in detail since 1996.

The Schandelah Scientific Drilling Project: A 25-million year record of Early Jurassic palaeo-environmental change from northern Germany

2019 ◽  
Vol 52 (3) ◽  
pp. 249-296 ◽  
Author(s):  
B. van de Schootbrugge ◽  
S. Richoz ◽  
J. Pross ◽  
F.W. Luppold ◽  
S. Hunze ◽  
...  
Keyword(s):  
Environmental Change ◽  
Early Jurassic ◽  
Northern Germany ◽  
Scientific Drilling ◽  
Drilling Project

Radiocarbon Chronology of the DSDDP Core at the Deepest Floor of the Dead Sea

Radiocarbon ◽  
2017 ◽  
Vol 59 (2) ◽  
pp. 383-394 ◽  
Author(s):  
Hiroyuki Kitagawa ◽  
Mordechai Stein ◽  
Steven L Goldstein ◽  
Toshio Nakamura ◽  
Boaz Lazar ◽  
...  
Keyword(s):  
Lake Level ◽  
Dead Sea ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Sedimentary Records ◽  
The Past ◽  
Plant Remains ◽  
The Dead ◽  
Radiocarbon Chronology ◽  
Drilling Project

AbstractThis study establishes the chronological framework of the sedimentary sequence deposited Dead Sea, ICDP 5017-1, Radiocarbon chronology during the past 50 ka at the deepest part of the Dead Sea (the ICDP 5017-1 site), which was recovered by the Dead Sea Deep Drilling Project (DSDDP) under the auspices of the International Continental Scientific Drilling Program (ICDP). The age-depth model is constructed using 3814C dates of terrestrial plant remains in a composite 150-m-long profile, generated by anchoring 32 marker layers identified in five cores. The sedimentary records at the ICDP 5017-1 site fills gaps in those obtained from the exposed sections at the high margins of the lake, particularly in times of lake-level retreat, and allows for a high-resolution comparison between the lake’s margins and deepest floor.

scholarly journals Deep Drilling into a Mantle Plume Volcano: The Hawaii Scientific Drilling Project

2009 ◽  
Vol 7 ◽  
pp. 4-14 ◽  
Author(s):  
E. M. Stolper ◽  
D. J. DePaolo ◽  
D. M. Thomas
Keyword(s):  
Mantle Plume ◽  
Deep Drilling ◽  
Scientific Drilling ◽  
Drilling Project

No abstract available. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.7.02.2009" target="_blank">10.2204/iodp.sd.7.02.2009</a>

Salton Sea Scientific Drilling Project; on-site science management; California

1986 ◽  
Author(s):  
J.H. Sass ◽  
S.S. Priest ◽  
L.C. Robison ◽  
J.D. Hendricks
Keyword(s):  
Salton Sea ◽  
Scientific Drilling ◽  
Science Management ◽  
Drilling Project

Is 3 years adequate for tracking completely occluded coiled aneurysms?

2020 ◽  
Vol 133 (3) ◽  
pp. 758-764
Author(s):  
Eung Koo Yeon ◽  
Young Dae Cho ◽  
Dong Hyun Yoo ◽  
Su Hwan Lee ◽  
Hyun-Seung Kang ◽  
...  
Keyword(s):  
De Novo ◽  
Careful Monitoring ◽  
Surveillance Period ◽  
Radiological Data ◽  
De Novo Aneurysm ◽  
Low Probability ◽  
Almost All ◽  
Annual Risk

OBJECTIVEThe authors conducted a study to ascertain the long-term durability of coiled aneurysms completely occluded at 36 months’ follow-up given the potential for delayed recanalization.METHODSIn this retrospective review, the authors examined 299 patients with 339 aneurysms, all shown to be completely occluded at 36 months on follow-up images obtained between 2011 and 2013. Medical records and radiological data acquired during the extended monitoring period (mean 74.3 ± 22.5 months) were retrieved, and the authors analyzed the incidence of (including mean annual risk) and risk factors for delayed recanalization.RESULTSA total of 5 coiled aneurysms (1.5%) occluded completely at 36 months showed recanalization (0.46% per aneurysm-year) during the long-term surveillance period (1081.9 aneurysm-years), 2 surfacing within 60 months and 3 developing thereafter. Four showed minor recanalization, with only one instance of major recanalization. The latter involved the posterior communicating artery as an apparent de novo lesion, arising at the neck of a firmly coiled sac, and was unrelated to coil compaction or growth. Additional embolization was undertaken. In a multivariate analysis, a second embolization for a recurrent aneurysm (HR = 22.088, p = 0.003) independently correlated with delayed recanalization.CONCLUSIONSAlmost all coiled aneurysms (98.5%) showing complete occlusion at 36 months postembolization proved to be stable during extended observation. However, recurrent aneurysms were predisposed to delayed recanalization. Given the low probability yet seriousness of delayed recanalization and the possibility of de novo aneurysm formation, careful monitoring may be still considered in this setting but at less frequent intervals beyond 36 months.

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