All ICDP Publications with Abstracts
From parent-sysfolder "Publications" + 2 folder-levels deep
2909.
The >250-kyr Lake Chala record: A tephrostratotype correlating archaeological, palaeoenvironmental and volcanic sequences across eastern Africa
Quaternary Science Reviews,
326
2024
Keywords:▾
Africa; East African Lakes; Lake Victoria; Argon; Geochemistry; Geochronology; Sediments; Volcanoes; Africa; Argon dating; East African Rift; East african rift system; Holocenes; Lake chala; Lake sediments; Palaeoclimate; Pleistocene; Rift systems; Tephrochronology; archaeology; chronology; crater lake; geochemistry; geochronology; Holocene; lacustrine deposit; Mesolithic; paleoclimate; tephrochronology; volcanic ash; Lakes
Abstract: ▾ Regional tephrostratigraphic frameworks connect palaeoclimate, archaeological and volcanological records preserved in soils or lake sediments via shared volcanic ash (tephra) layers. In eastern Africa, tracing of tephra isochrons between geoarchaeological sequences is an established chronostratigraphic approach. However, to date, few long tephra records exist from sites with continuous depositional sequences, such as lake sediments, which offer the potential to connect local and discontinuous sequences at the regional scale. Long lake sediment sequences may also capture more complete eruptive histories of understudied volcanic centres. Here, we present and date the tephrostratigraphic record of a >250,000-year (>250-kyr) continuous sediment sequence extracted from Lake Chala, a crater lake on the Kenya-Tanzania border near Mt Kilimanjaro. Single-grain glass major and minor element analyses of visible and six cryptotephra layers reveal compositions ranging from mafic foidites and basanites to more evolved tephri-phonolites, phonolites, trachytes and a single rhyolite. Of these, nine are correlated to scoria cone eruptions of neighbouring Mt Kilimanjaro or the Chyulu volcanic field ∼60 km to the north; seven are correlated to phonolitic eruptions of Mt Meru, ∼100 km to the west; and four to voluminous trachytic eruptions of Central Kenyan Rift (CKR) volcanoes located ∼350 km to the north. The only rhyolitic tephra layer, a cryptotephra, correlates to the 73.7-ka BP (before present, taken as 1950 CE) Younger Toba Tuff (YTT) from Sumatra. Two of the CKR tephra layers provide direct ties with terrestrial sequences relevant to Middle Stone Age archaeology of the eastern Lake Victoria basin in Kenya. Absolute age estimates obtained by direct 40Ar/39Ar dating of 10 tephra layers are combined with six 210Pb and 162 14C dates covering the last 25-kyr and the well-constrained known age of the YTT to build a first absolute chronology for the full Lake Chala sediment sequence. The uninterrupted >250-kyr Lake Chala sedimentary archive represents a unique tephrostratotype sequence for eastern Africa, optimising the chronological value of tephra correlations in regional palaeoenvironmental, archaeological and volcanological research. Further study of cryptotephra in the Lake Chala sequence and additional geochemical characterisation and dating of ancient volcanic eruptions from nearby and further afield may eventually produce a regionally connected and detailed tephrostratigraphic framework for eastern equatorial Africa. © 2024 The Authors
2908.
Workshop report: Afar Dallol Drilling - ONset of sedimentary processes in an active rift basin (ADD-ON)
Scientific Drilling,
33
(2)
207--218
2024
2907.
Vegetation response to climate changes in the eastern Arctic during the Middle Gelasian age of the Early Pleistocene
Review of Palaeobotany and Palynology,
324
2024
Keywords:▾
Arctic; Chukchi; Elgygytgyn Lake; Russian Federation; climate change; glaciation; interglacial; isotopic analysis; marine isotope stage; paleobotany; palynology; Pleistocene; pollen; vegetation cover
Abstract: ▾ Palynological analysis of sediments from El'gygytgyn Lake document vegetation changes in the Eastern Arctic from early marine isotope stage (MIS) 74 to late MIS 80 (c.2.1–1.9 MA) and close the last remaining gap in the El'gygytgyn pollen record. Cooler climates were characterized by a mix of Larix forest-tundra, shrub Betula tundra, and herb-dominated communities. During interglaciations, Larix forests with tree Betula and Alnus, and perhaps with a minor component of Picea and tree Pinus, characterized areas that today are tundra. These forests included a rich shrub understory of Betula, Duschekia, Salix, and Pinus pumila. Although MIS 77 has been considered a “super” interglaciation, the data do not indicate that this stage was exceptionally warm. Interstadial conditions are denoted by pollen assemblages that indicate the regional vegetation was dominated by Larix forest -tundra and an absence of Pinus pumila. The palynological results from this Early Pleistocene interval demonstrate the need to: 1) modify the El'gygytgyn age model; 2) reevaluate the relationship of sediment facies to climate change; and 3) reconsider the occurrence and/or definition of “super” interglaciations. © 2023
2906.
In situ stress state of deep basement in the Songliao Basin: Evidence from in situ stress measurement in SK-2 borehole; [松辽盆地深部基底地应力状态: 来自松科2 井地应力实测数据的证据]
Earth Science Frontiers,
31
(2)
377 – 390
2024
2905.
Timescales of mafic magmatic fractionation documented by paleosecular variation in basaltic drill core, Snake River Plain volcanic province, Idaho, USA
Bulletin of the Geological Society of America,
136
(9-10)
4252 – 4262
2024
DOI:10.1130/B37413.1
2904.
The optimum fire window: applying the fire-productivity hypothesis to Jurassic climate states
Biogeosciences,
21
(11)
2795 – 2809
2024
Keywords:▾
aridity; grass; grassland; Jurassic; paleoecology; paleoenvironment; rainfall; seasonality; wildfire
Abstract: ▾ Present-day fire frequency is related to a productivity-aridity gradient on regional and global scales. Optimum fire conditions occur at times of intermediate productivity and aridity, whereas fire is limited at the high productivity (moisture) and aridity (no fuel) endmembers. However, the current global fire activity pattern is reinforced by the predominant burning of grasslands. Here we test the intermediate fire-productivity hypothesis for a period on Earth before the evolution of grasses, the Early Jurassic, and explore the fire regime of two contrasting climatic states: the cooling of the Late Pliensbachian Event (LPE) and the warming of the Sinemurian-Pliensbachian Boundary (SPB). Palaeo-fire records are reconstructed from fossil charcoal abundance, and changes in the hydrological cycle are tracked via clay mineralogy, which allows inference of changes in fuel moisture status. Large fluctuations in the fossil charcoal on an eccentricity timescale indicate two modes of fire regime at the time. Wildfires were moisture-limited in a high-productivity ecosystem during eccentricity minima for both the SPB and the LPE. During eccentricity maxima fires increased, and an optimum fire window was reached, in which periodically greater seasonality in rainfall and temperatures led to intermediate states of productivity and aridity. The LPE experienced more extreme climatic endmembers compared to the SPB, with the fire regime edging closer to "moisture limitation"during eccentricity minima, and experienced more pronounced seasonality during eccentricity maxima, explained by the overall cooler climate at the time. This study illustrates that the intermediate-productivity gradient holds up during two contrasting climatic states in the Jurassic. © 2024 Copernicus Publications. All rights reserved.
2903.
The Nam Co Drilling Project, Tibet Plateau (NamCore): A one-million-year sedimentary record from the Third Pole
Past Global Changes Magazine,
32
(2)
76-77
2024
2902.
The Merensky-Bastard interval at Hackney, eastern Bushveld Complex: results of a combined Sr–Nd-isotopic investigation
Contributions to Mineralogy and Petrology,
179
(7)
2024
2901.
The ICDP Dead Sea drilling project: A window into the past 220 kyrs of hydroclimate and seismicity of the Eastern Mediterranean-Levant
Past Global Changes Magazine,
32
(2)
96-97
2024
2900.
The COSC-2 drill core and its well-preserved lower Palaeozoic sedimentary succession – an unexpected treasure beneath the Caledonian nappes
Estonian Journal of Earth Sciences,
73
(2)
134 – 140
2024
2899.
The Barberton Drilling Project's Buck Reef Chert core BARB3 – Sedimentary facies and depositional environment of a 3.4 Ga marine platform succession
Precambrian Research,
414
2024
2898.
Terminal glacial overdeepenings: Patterns of erosion, infilling and new constraints on the glaciation history of Northern Switzerland
Quaternary Science Reviews,
344
2024
2897.
Radiolytic support for oxidative metabolism in an ancient subsurface brine system
ISME Communications,
4
(1)
2024
2896.
Technical status and development suggestions of extra‑deep scientific drilling equipment (in Chinese with English abstract);[特深科学钻探装备技术现状与发展建议]
Drilling Engineering,
51
(04)
14-22
2024
2895.
Technical scheme and research suggestion of deviation prevention and correction for myriametric extra‑deep scientific well (in Chinese with English abstract); [万米科学特深井防斜纠斜技术方案及研究建议]
Drilling Engineering,
51
(4)
31 – 37
2024
2894.
Taxonomic and functional partitioning of Chloroflexota populations under ferruginous conditions at and below the sediment-water interface
FEMS Microbiol Ecol
2024
2893.
Supergene formation of sulfur-rich, tochilinite-bearing serpentinites in the Oman ophiolite
Nat Commun,
15
2024
2892.
Supergene formation of sulfur-rich, tochilinite-bearing serpentinites in the Oman ophiolite
Lithos,
488-489
2024
2891.
Subsurface Microbial Colonization at Mineral-Filled Veins in 2-Billion-Year-Old Mafic Rock from the Bushveld Igneous Complex, South Africa
Microbial Ecology,
87
(1)
2024
2890.
Spatio-temporal variations of climate along possible African-Arabian routes of H. sapiens expansion
Quaternary Science Advances,
14
2024
Abstract: ▾ Eastern Africa and Arabia were major hominin hotspots and critical crossroads for migrating towards Asia during the late Pleistocene. To decipher the role of spatiotemporal environmental change on human occupation and migration patterns, we remeasured the marine core from Meteor Site KL 15 in the Gulf of Aden and reanalyzed its data together with the aridity index from ICDP Site Chew Bahir in eastern Africa and the wet-dry index from ODP Site 967 in the eastern Mediterranean Sea using linear and nonlinear time series analysis. These analyses show major changes in the spatiotemporal paleoclimate dynamics at 400 and 150 ka BP (thousand years before 1950), presumably driven by changes in the amplitude of the orbital eccentricity. From 400 to 150 ka BP, eastern Africa and Arabia show synchronized wet-dry shifts, which changed drastically at 150 ka BP. After 150 ka BP, an overall trend to dry climate states is observable, and the hydroclimate dynamics between eastern Africa and Arabia are negatively correlated. Those spatio-temporal variations and interrelationships of climate potentially influenced the availability of spatial links for human expansion along those vertices. We observe positively correlated network links during the supposed out-of-Africa migration phases of H. sapiens. Furthermore, our data do not suggest hominin occupation phases during specific time intervals of humid or stable climates but provide evidence of the so far underestimated potential role of climate predictability as an important factor of hominin ecological competitiveness. © 2024 The Authors
2889.
Shaped and filled by the Rhine Glacier: the overdeepened Tannwald Basin in southwestern Germany
Scientific Drilling,
33
(2)
191 – 206
2024
2888.
Seismic structure of the Balmuccia Peridotite from a high-resolution refraction and reflection survey
Geophysical Journal International,
238
(3)
1612 – 1625
2024
2887.
Sedimentary Paleoenvironment and Organic Matter Enrichment
Characteristics of Lacustrine Shahezi Shale in Songliao Basin: Insights
from the Continental Scientific Drilling
ACS OMEGA,
9
(19)
21097-21115
2024
2886.
Rhenium-platinum group elements reveal seawater incursion induced massive lacustrine organic carbon burial
Geochimica et Cosmochimica Acta,
384168 – 177
2024
2885.
Integrated chronostratigraphic framework for Cretaceous strata in the Songliao Basin; [松辽盆地白垩纪综合年代地层格架]
Earth Science Frontiers,
31
(1)
431 – 445
2024