All ICDP Publications with Abstracts
From parent-sysfolder "Publications" + 2 folder-levels deep
2869.
Advances in research on terrestrial paleoclimate in the mid-Cretaceous hothouse earth (in Chinese with English abstract); [白垩纪中期热室地球陆地古气候研究进展]
Quaternary Sciences,
44
(5)
1188-1204
2024
2868.
Active seismic surveys for drilling target characterization in Ossola Valley: International Continental Scientific Drilling Program (ICDP) project Drilling the Ivrea-Verbano zonE (DIVE) phase i
Scientific Drilling,
33
(2)
219 – 236
2024
Keywords:▾
Geological surveys; Glacial geology; Glaciers; Hydrogeology; Jurassic; Miocene; Seismic prospecting; Seismic response; Structural geology; Active seismic; Continental scientific drillings; Drilling projects; Drilling targets; High resolution; Phase I; Seismic surveys; Site-specific; Target characterization; Target location; Sedimentology
Abstract: ▾ Drilling target locations of the International Continental Scientific Drilling Program (ICDP) project Drilling the Ivrea-Verbano zonE (DIVE) have been initially proposed based on geological knowledge of surface outcrops and the structural context of the Ivrea-Verbano zone (IVZ) and of the Insubric Line. For the determination of the exact locations of drilling sites as well as for drilling geometry planning, we have carried out a series of active seismic experiments to image the subsurface at high resolution. The two drilling sites of project DIVE in Ossola Valley, one near Ornavasso and the other in Megolo di Mezzo, in the central part of the Ivrea-Verbano zone have been surveyed with site-specific velocity models and a seismic data processing chain. The findings have been interpreted in relation with the outcropping structures. These suggest a reasonable continuity from the surface. They also guide the planned borehole orientations: near-vertical at DT-1B (Ornavasso) into the tightly folded Massone Antiform and at 15-20° from the vertical in Megolo across a flank of the broad Proman Anticline. The seismic surveys indicate that the sedimentary overburden is up to 50 m deep at the specific drill sites and can be minimized by relocating the proposed locations. The seismic surveys also indicate that the center of the Ossola Valley contains about 550 m of sedimentary infill, defining the interface of bedrock and Quaternary glacial sediments at about 300 m below sea level. © 2024 Andrew Greenwood et al.
2867.
Accessing Magma: A Necessary Revolution in Earth Sciences and Renewable Energy
European Review,
32
(4)
412 – 434
2024
2866.
A Trial Evaluation of Rock Core DCDA Absolute Shear Stress Measurement for Routine Quantitative Mining Hazard Assessment in Deep Underground High Stress Mines
Materials Transactions,
65
(7)
817 – 823
2024
2865.
A 1 Ma sedimentary ancient DNA (sedaDNA) record of catchment vegetation changes and the developmental history of tropical Lake Towuti (Sulawesi, Indonesia)
Geobiology,
22
(3)
e12599
2024
Keywords:▾
Greater Sunda Islands; Indonesia; Lake Towuti; Malili Lakes; South Sulawesi; Sulawesi; Sulawesi; Sunda Isles; catchment; ground cover; Holocene; landscape ecology; nutrient availability; ooze; paleoecology; paleoenvironment; peatland; seasonality; tropical forest
Abstract: ▾ Studying past ecosystems from ancient environmental DNA preserved in lake sediments (sedaDNA) is a rapidly expanding field. This research has mainly involved Holocene sediments from lakes in cool climates, with little known about the suitability of sedaDNA to reconstruct substantially older ecosystems in the warm tropics. Here, we report the successful recovery of chloroplast trnL (UAA) sequences (trnL-P6 loop) from the sedimentary record of Lake Towuti (Sulawesi, Indonesia) to elucidate changes in regional tropical vegetation assemblages during the lake's Late Quaternary paleodepositional history. After the stringent removal of contaminants and sequence artifacts, taxonomic assignment of the remaining genuine trnL-P6 reads showed that native nitrogen-fixing legumes, C3 grasses, and shallow wetland vegetation (Alocasia) were most strongly associated with >1-million-year-old (>1 Ma) peats and silts (114–98.8 m composite depth; mcd), which were deposited in a landscape of active river channels, shallow lakes, and peat-swamps. A statistically significant shift toward partly submerged shoreline vegetation that was likely rooted in anoxic muddy soils (i.e., peatland forest trees and wetland C3 grasses (Oryzaceae) and nutrient-demanding aquatic herbs (presumably Oenanthe javanica)) occurred at 76 mcd (~0.8 Ma), ~0.2 Ma after the transition into a permanent lake. This wetland vegetation was most strongly associated with diatom ooze (46–37 mcd), thought to be deposited during maximum nutrient availability and primary productivity. Herbs (Brassicaceae), trees/shrubs (Fabaceae and Theaceae), and C3 grasses correlated with inorganic parameters, indicating increased drainage of ultramafic sediments and laterite soils from the lakes' catchment, particularly at times of inferred drying. Downcore variability in trnL-P6 from tropical forest trees (Toona), shady ground cover herbs (Zingiberaceae), and tree orchids (Luisia) most strongly correlated with sediments of a predominantly felsic signature considered to be originating from the catchment of the Loeha River draining into Lake Towuti during wetter climate conditions. However, the co-correlation with dry climate-adapted trees (i.e., Castanopsis or Lithocarpus) plus C4 grasses suggests that increased precipitation seasonality also contributed to the increased drainage of felsic Loeha River sediments. This multiproxy approach shows that despite elevated in situ temperatures, tropical lake sediments potentially comprise long-term archives of ancient environmental DNA for reconstructing ecosystems, which warrants further exploration. © 2024 The Authors. Geobiology published by John Wiley & Sons Ltd.
2864.
A seismic ambient noise data classification method based on waveform and frequency-wavenumber analysis: Application to reliable geological interpretation adjacent to Well Songke-2, Northeast China
Geophysics,
89
(4)
Q1 – Q12
2024
2863.
A new species of benthic ostracod Tuberoloxoconcha: A proxy for glacioeustatic sea-level changes in the Gulf of Corinth
Palaeogeography, Palaeoclimatology, Palaeoecology,
655
2024
2862.
A Lake Record of Geomagnetic Secular Variations for the Last 23 ka From Lake Chala: Toward a Composite Directional Lake Record of the Earth's Magnetic Field for Equatorial East Africa
Geochemistry, Geophysics, Geosystems,
25
(3)
2024
2861.
A comprehensive crosshole seismic experiment in glacial sediments at the ICDP DOVE site in the Tannwald Basin
Scientific Drilling,
33
(2)
237 – 248
2024
2860.
A 1.1 million-year vegetation history of the Mediterranean region: Scientific drilling reveals sensitivities of forest ecosystems
Past Global Changes Magazine,
32
(2)
118-119
2024
2859.
Identification of the Campanian Ignimbrite in the Dead Sea and consequent time-transgressive hydroclimatic shifts in the Eastern Mediterranean
Scientific Reports,
14
(1)
2024
2858.
Combined Neutron and X-Ray Tomography—A Versatile and Non-Destructive Tool in Planetary Geosciences
Journal of Geophysical Research: Planets,
129
(2)
2024
Keywords:▾
impact structure; iron; Mars; meteorite; nickel; spherule; X-ray tomography
Abstract: ▾ With several upcoming sample return missions, such as the Mars Sample Return Campaign, non-destructive methods will be key to maximizing their scientific output. In this study, we demonstrate that the combination of neutron and X-ray tomography provides an important tool for the characterization of such valuable samples. These methods allow quantitative analyses of internal sample features and also provide a guide for further destructive analyses with little to no sample treatment, which maintains sample integrity, including minimizing the risk of potential contamination. Here, we present and review the results from four case studies of terrestrial impactites and meteorites along with their analytical setup. Using combined X-ray and neutron tomography, a Ni-Fe silicide spherule, that is, projectile material, was located within a Libyan Desert Glass sample and the distribution of hydrous phases was pinpointed in selected impactite samples from the Chicxulub IODP-ICDP Expedition 364 drill core and the Luizi impact structure, as well as in the Miller Range 03346 Martian meteorite. © 2024. The Authors.
2857.
A strainmeter array as the fulcrum of novel observatory sites along the Alto Tiberina Near Fault Observatory
Scientific Drilling,
33
(2)
173--190
2024
2856.
Continental scientific drilling and microbiology: (extremely) low biomass in bedrock of central Sweden
Biogeosciences,
21
(2)
591 – 604
2024
Keywords:▾
Sweden; bacterium; bedrock; biomass; biosphere; DNA; drilling fluid; microbiology
Abstract: ▾ Scientific drilling expeditions offer a unique opportunity to characterize microbial communities in the subsurface that have long been isolated from the surface. With subsurface microbial biomass being low in general, biological contamination from the drilling fluid, sample processing, or molecular work is a major concern. To address this, characterization of the contaminant populations in the drilling fluid and negative extraction controls are essential for assessing and evaluating such sequencing data. Here, rock cores down to 2250m depth, groundwater-bearing fractures, and the drilling fluid were sampled for DNA to characterize the microbial communities using a broad genomic approach. However, even after removing potential contaminant populations present in the drilling fluid, notorious contaminants were abundant and mainly affiliated with the bacterial order Burkholderiales. These contaminant microorganisms likely originated from the reagents used for isolating DNA despite stringent quality standards during the molecular work. The detection of strictly anaerobic sulfate reducers such as Candidatus Desulforudis audaxviator suggested the presence of autochthonous deep biosphere taxa in the sequenced libraries, yet these clades represented only a minor fraction of the sequence counts (<0.1 %), hindering further ecological interpretations. The described methods and findings emphasize the importance of sequencing extraction controls and can support experimental design for future microbiological studies in conjunction with continental drilling operations. © 2024 George Westmeijer et al.
2855.
From coral reefs towards unveiling the deep geobiosphere in extreme rift settings: Afar Dallol Drilling (ADD-ON)
Past Global Changes Magazine,
32
(2)
122-123
2024
2854.
Controls on Quaternary geochemical and mineralogical variability in the Koora Basin and South Kenya Rift
Palaeogeography, Palaeoclimatology, Palaeoecology,
637
2024
Keywords:▾
East African Rift; Kenya; Kenya Rift; environmental history; geochemistry; mineralogy; paleolimnology; Quaternary; volcanism; volcanology
Abstract: ▾ The South Kenya Rift is comprised of a series of N-S-oriented grabens with sediments that preserve an approximate one-million-year environmental history that reflects the interplay of climate, tectonism and volcanism. This study attempts to disentangle the relative roles of these major controls by comparing the geochemical records preserved in three sedimentary basins. The study focuses on the Koora Basin using bulk geochemical data in a 139-m-long core. This record is then compared with geochemical data and environmental histories from a 196-m-long core at Magadi and outcrops in the Olorgesailie Basin. Four climatic phases (1000–850; 850–470; 470–400; 400–0 ka) are recognised at Koora, which can also be distinguished in the Magadi and Olorgesailie Basins. However, inter-basin contrasts also suggest that additional, non-climatic factors influenced these geochemical histories, particularly during four intervals. These include 1) the Magadi Transition (MT; ∼770–700 ka), 2) the Magadi Tectonic Event (MTE; ∼540 ka), 3) the Koora Instability Period (KIP; ∼325–180 ka), and 4) the Trona Precipitation Period (TPP; ∼105–0 ka). Prior to the MT, Zr/TiO2, La/Lu, Mo, As, V and Na/Ca in Magadi and Koora cores were similar but afterwards diverged. Major reductions in transition metals at Magadi during the MTE reflect tectonically-induced cross-rift drainage diversion. This contrasts with the Koora and Olorgesailie basins where these metals were constant from ∼1000 to 300 ka. The KIP represents a significant increase in volcanic inputs to the Koora Basin and increased geochemical variability. Bromine (Br), which reflects peralkaline volcanic activity and/or evaporative concentration, is elevated during the KIP at Koora but is below detection limits in the rest of the Koora core. Br in the Magadi core does not correlate with that in the Koora record, suggesting contrasting accumulation processes. The TPP represents a phase of trona precipitation at Magadi but not at Koora. This difference partly reflects increased magmatic CO2 rising along faults in the Magadi basin during a period of increasing aridity. Rare-earth element patterns indicate a major change at Magadi with many anomalies after about 325 ka to the present, caused by the development of hypersaline waters, which did not occur at Koora or Olorgesailie. The geochemical data from the three basins help to partially separate climatic controls from those related to volcanism, tectonism and local geomorphology. © 2023
2853.
ICDP workshop on the Lake Victoria Drilling Project (LVDP): scientific
drilling of the world's largest tropical lake
Scientific Drilling,
33
(1)
21--31
2024
2852.
ICDP workshop on the Deep Drilling in the Turkana Basin project: exploring the link between environmental factors and hominin evolution over the past 4 Myr
Scientific Drilling,
33
(2)
93--108
2024
2851.
How to colonize a planet: ICDP project BASE drills Paleoarchean coastal strata of the Barberton Greenstone Belt
Past Global Changes Magazine,
32
(2)
106-107
2024
2850.
Hot carbonates deep within the Chicxulub impact structure
PNAS Nexus,
3
(1)
2024
2849.
Geothermal play fairway analysis, part 1: Example from the Snake River Plain, Idaho
Geothermics,
117
2024
2848.
Geophysical logs as proxies for cyclostratigraphy: Sensitivity evaluation, proxy selection, and paleoclimatic interpretation
Earth-Science Reviews,
252
2024
2847.
Geophysical downhole logging analysis within the shallow-depth ICDP STAR drilling project (central Italy)
Solid Earth,
15
(11)
1385 – 1406
2024
2846.
Geochemistry and origins of hydrogen-containing natural gases in deep Songliao Basin, China: Insights from continental scientific drilling
Petroleum Science,
21
(2)
741 – 751
2024
2845.
From warm to cold: 3.6 million years of paleoclimate history from Lake El’gygytgyn, far-east Russia
Past Global Changes Magazine,
32
(2)
72-73
2024