All ICDP Publications with Abstracts
From parent-sysfolder "Publications" + 2 folder-levels deep
2677.
On the occurrence of rare nannoliths (calcareous nannofossils) in the Early Jurassic and their implications for the end-Triassic mass extinction
Papers in Palaeontology,
9
(2)
2023
2676.
Significance of Secondary Fe-Oxide and Fe-Sulfide Minerals in Upper Peak Ring Suevite from the Chicxulub Impact Structure
Minerals,
13
(3)
2023
2675.
Olivine—The Alteration Rock Star
Elements,
19
(3)
165 – 172
2023
Keywords:▾
Carbon dioxide; Earth (planet); Olivine; Stars; Alteration; Aqueous fluids; Exposed to; Physical and chemical properties; Star-like; Tectonic plates; Upper mantle; carbon dioxide; chemical alteration; olivine; serpentine; upper mantle; Serpentine
Abstract: ▾ Olivine is the main component of the Earth’s upper mantle, on which our tectonic plates rest. As such, olivine has been studied since the dawn of geology and is regarded as the storyteller of the Earth’s interior. Its physical and chemical properties provide insight into its creation in magmas and its voyage through the upper mantle. However, when olivine is exposed to aqueous fluids, it adopts a more rebellious, rock star–like disposition. Here, we show that the discord, or disequilibrium, between olivine, its reaction products, and fluids containing water and carbon dioxide is so significant that it has been instrumental in changing the Earth throughout the planet’s history and will continue to do so well into the future. © 2023 Mineralogical Society of America. All rights reserved.
2674.
Shallow- and deep-ocean Fe cycling and redox evolution across the
Pliensbachian-Toarcian boundary and Toarcian Oceanic Anoxic Event in
Panthalassa
EARTH AND PLANETARY SCIENCE LETTERS,
602
2023
2673.
The Upper-Lower Cretaceous boundary in the southern Songliao Basin: A case study of ICDP borehole SK-3; [松辽盆地南部上、下白垩统界线研究:以松辽盆地 国际大陆科学钻探松科3井为例]
Earth Science Frontiers,
30
(3)
425 – 440
2023
ISSN: 10052321
Publisher: Science Frontiers editorial department
Keywords:▾
Binary alloys; Boreholes; Deposits; Geochronology; Infill drilling; Isotopes; Lead alloys; Sedimentary rocks; Sedimentology; Stratigraphy; Zircon; Continental scientific drillings; Cretaceous denglouku - quantou formation; Denglouku formations; Drilling projects; International continental scientific drilling program borehole SK-3; Lower Cretaceous; Potential global boundary stratotype section and point golden spike in terrestrial stratum; Songliao basin; Upper and low cretaceous stratigraphic boundary; Upper Cretaceous; Deposition rates
Abstract: ▾ The internationally recognized absolute isotopic age of the Upper-Lower Cretaceous stratigraphic boundary is 100.5 Ma, and the Global Boundary Stratotype Section and Points (GSSP) for the boundary is placed in marine strata; however, there have been no reports of GSSP ("golden spikes") for terrestrial boundaries anywhere in the world. The terrestrial Upper-Lower Cretaceous stratigraphic boundary is of great value in understanding the evolution of paleogeography, paleoenvironment and paleoclimate on land under the greenhouse conditions in the Middle Cretaceous, and the ideal geological records for studying this boundary may be found in the Songliao Basin, northeastern China, where a complete set of Cretaceous continental strata are developed. Here, we investigated the rock types, lithologic sequence and sedimentary facies in the core section of International Continental Scientific Drilling Program (ICDP) borehole SK-3, southern Songliao Basin. Based on the core description, gray and gray-green rhyolitic lithic crystalline tuffite deposit is found in the coastal-shallow lacustrine sedimentary sequences of the upper part of the second member of the Quantou Formation at 1191. 6 m depth. The tuffite deposit, according to zircon U-Pb dating of its syndepositional magmatic components, has an zircon age of (96.8±2.9) Ma and belongs to the Middle-Cenomanian period. Combined with previous data, the deposition rate for the Quantou-Denglouku Formations in the study area is 90. 54-110 m/Ma, and we conclude accordingly that the Upper-Lower Cretaceous stratigraphic boundary is located in the middle of the first member of the Quantou Formation in borehole SK-3 (at 1526.6-1598. 6 m depth). Considering analytical errors in the age-dating results, the Upper-Lower Cretaceous stratigraphic boundary in borehole SK-3 is independently calculated to be between the middle of the second member of the Quantou Formation and the upper part of the fourth member of the Denglouku Formation (at 1279. 6-1917. 6 m depth). Other researchers have tentatively placed the boundary in the Denglouku Formation based on the chronological data of ICDP borehole SK-1 and SK-2, northern Songliao Basin. The continuous coring data reveal continuous fluvial-lacustrine sedimentary sequences in the Denglouku - Quantou Formations in borehole SK-3; while results of seismic horizon matching further suggest the Denglouku - Quantou Formations are widely developed across the Songliao Basin and sedimentary records of continuous deposition are widespread. Therefore, the Denglouku - Quantou Formations across the basin should provide the geological record of continuous deposition of the Upper-Lower Cretaceous stratigraphic boundary. And this paper provides the basic dataset and exploration direction to find the "golden spikes" for the Upper and Lower Cretaceous continental stratigraphic boundary in the Songliao Basin and adjacent areas. © 2023 Science Frontiers editorial department. All rights reserved.
2672.
Special Issue on Ophiolites and Oceanic Lithosphere
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,
128
(4)
2023
2671.
Two Small Volcanoes, One Inside the Other: Geophysical and Drilling
Investigation of Bazina Maar in Western Eger Rift
EARTH AND SPACE SCIENCE,
10
(8)
2023
Keywords:▾
maar-diatreme volcano; magnetometry; electrical resistivity tomography;
drilling; gravity survey; Eger Rift
2670.
Millennial hydrological variability in the continental northern Neotropics during Marine Isotope Stages (MISs) 3-2 (59-15 cal ka BP) inferred from sediments of Lake Petén Itzá, Guatemala
Climate of the Past,
19
(7)
1409 – 1434
2023
Keywords:▾
Atlantic Ocean; Atlantic Ocean (Tropical); Guatemala [Central America]; Lake Peten Itza; Pacific Ocean; Pacific Ocean (Equatorial); Peten; Atlantic Multidecadal Oscillation; atmospheric convection; climate conditions; climate variation; hydrological change; intertropical convergence zone; lacustrine deposit; marine isotope stage; Neotropical Region; overturn; paleoclimate; primary production; redox conditions; sediment core
Abstract: ▾ Lake Petén Itzá (Guatemala) possesses one of the longest lacustrine sediment records in the northern Neotropics, which enabled study of paleoclimate variability in the region during the last ∼400000 years. We used geochemical (Ti, Ca/(Ti+Fe) and Mn/Fe) and mineralogical (carbonates, gypsum, quartz, clay) data from sediment core PI-2 to infer past changes in runoff, lake evaporation, organic matter sources and redox conditions in the water column, caused by hydrological changes in the northern Neotropics during Marine Isotope Stages (MISs) 3-2. From 59 to 39 cal ka BP climate conditions were relatively wet, and the lake was marked by higher primary productivity and anoxic bottom waters. This wet environment was interrupted for two periods of possible low water level at 52 and 46 cal ka BP, when our data suggest higher evaporation, high terrestrial organic matter input and persistent oxic conditions. Between 39 and 23 cal ka BP, evaporation and input of terrestrial organic matter increased considerably, lake level declined, and lake bottom waters generally became oxic. These conditions reversed during the Last Glacial Maximum (23.5-18.0 cal ka BP), when runoff and lake productivity increased, and rising lake level caused bottom waters to again become anoxic. Comparison of our hydrologic proxy data with sea surface temperature anomalies between the eastern Pacific and the Caribbean suggests that changes in the intensity of the Caribbean Low-Level Jet (CLLJ) may have influenced long-term changes in runoff during MISs 3-2. Higher intensity of the CLLJ during the onset of MIS 3 and the LGM might have led to greater runoff into the lake, whereas the MIS 3-2 transition experienced a weaker CLLJ and consequently less runoff. A refined, high-resolution age-depth model for the PI-2 sediment core enabled us to identify millennial-scale Greenland interstadials (GIs) 14-2, Greenland stadials (GSs) 14-2 and Heinrich stadials (HSs) 5-1. In general, HSs and GSs were characterized by drier conditions. In contrast to GSs and HSs, GIs were characterized by greater runoff and overall wetter conditions, with the most pronounced GI peaks between 40 and 30 cal ka BP. Whereas GSs 9, 8, 7 and 6 began with abrupt increases in evaporation and ended with gradual increases in humidity, GSs 11 and 10 showed reversed patterns. The Lake Petén Itzá paleohydrology record, along with other regional paleoclimate records, led us to conclude that shifts in the position of the Intertropical Convergence Zone (ITCZ) altered moisture delivery to the lake on millennial timescales. During GSs and HSs, high evaporation from Petén Itzá (dry climate conditions) was associated with a more southerly position of the ITCZ, whereas wetter GIs prevailed during a more northerly ITCZ position. Although abrupt millennial-scale shifts in ITCZ and hydroclimate between GSs/HSs and GIs can be linked to instabilities in the Atlantic Meridional Overturning Circulation (AMOC), longer-term changes were additionally influenced by changes in atmospheric convection linked to modulations of the CLLJ in response to ΔSST between the equatorial Pacific and tropical Atlantic. © 2023 Rodrigo Martínez-Abarca et al.
2669.
Workshop report: PlioWest -- drilling Pliocene lakes in western North America
Scientific Drilling,
3261-72
2023
2668.
Workshop on drilling the Nicaraguan lakes: bridging continents and oceans (NICA-BRIDGE)
Scientific Drilling,
3273-84
2023
2667.
Volcanosedimentary fill of the early Cretaceous Yingcheng formation and
response to the end of continental rifting in the Songliao Basin:
Constraints from well SK-2, northern Xujiaweizi fault depression
MARINE AND PETROLEUM GEOLOGY,
157
2023
Keywords:▾
Yingcheng formation; Strike-slip faulting; Songliao basin; End of
continental rifting; Early cretaceous; SK-2
2666.
Volcanic impact on terrestrial and aquatic ecosystems in the Eastern Mediterranean
Communications Earth and Environment,
4
(1)
2023
2665.
Unlocking national treasures: the core scanning approach
Geological Society Special Publication,
527
(1)
77 – 94
2023
2664.
Timing and recurrence intervals for voluminous silicic eruptions from
Amatitlan caldera (Guatemala)
QUATERNARY SCIENCE REVIEWS,
301
2023
Keywords:▾
Quaternary geochronology; Zircon; (UeTh)/He; SIMS; Central America;
40Ar/39Ar
2663.
Study of Depression and Layer Controlled Geothermal System in Songliao Basin (in Chinese with English abstract);[松辽盆地坳陷层控地热系统研究]
Acta Geoscientica Sinica,
44
(01)
21-32
2023
2662.
The response of borehole water levels in an ophiolitic, peridotite aquifer to atmospheric, solid Earth, and ocean tides
Journal of Hydrology X,
21
2023
2661.
The Possible Role of Anoxic Alkaline High Subcritical Water in the Formation of Ferric Minerals, Methane and Disordered Graphitic Carbon in a BARB3 Drilled Sample of the 3.4 Ga Buck Reef Chert
Origins of Life and Evolution of Biospheres,
53
(1-2)
1 – 41
2023
2660.
The origin of carbonates in impact melt-bearing breccias from Site M0077 at the Chicxulub impact structure, Mexico
Meteoritics and Planetary Science,
58
(6)
834 – 854
2023
Abstract: ▾ Carbonates from the impact melt-bearing breccia in the 2016 IODP/ICDP Expedition 364 drill core at Site M0077 were systematically documented and characterized petrographically and geochemically. Calcite, the only carbonate mineral present, is abundant throughout this deposit as five distinct varieties: (1) subangular carbonate clasts (Type A); (2) subround/irregular carbonate clasts with clay altered rims (Type B); (3) fine-crystalline matrix calcite (Type C); (4) void-filling sparry calcite (Type D); and (5) microcrystalline carbonate with flow textures (Type E). Quantitative geochemical analysis shows that calcite in all carbonate varieties are low in elemental impurities (<2.0 cumulative wt% on average); however, relative concentrations of MgO and MnO vary, which provides distinction between each variety: MgO is highest in calcite from Types A, B, and C carbonates (0.2–0.8 wt% on average); MnO is highest in calcite from Types B, C, and D carbonates (0.2–1.3 wt% on average); and calcite from Type E carbonate is most pure (<0.1 wt% on average MgO and MnO, cumulatively). Based on textural and geochemical variations between carbonate types, we interpret that some of the carbonate target rocks melted during impact and were immiscible within the silicate-dominated melt sheet prior to the resurgence of seawater. Type B clasts were formed by molten fuel–coolant interaction, as the incoming seawater eroded through the melt sheet and encountered carbonate melt (Type E). Post-impact meteoric-dominated hydrothermal activity produced the Mn-elevated calcite from Type C and D carbonates, and altered the Type B clasts to be elevated in Mn and host a clay-rich rim. © 2023 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society.
2659.
The geodynamic and limnological evolution of Balkan Lake Ohrid, possibly the oldest extant lake in Europe
Boreas,
52
(1)
1 – 26
2023
ISSN: 03009483
Publisher: John Wiley and Sons Inc
Keywords:▾
Balkan; Lake Ohrid; Turkmenistan; clast; displacement; geodynamics; lacustrine deposit; lake evolution; limnology; sedimentation; sedimentology
Abstract: ▾ Studies of the upper 447 m of the DEEP site sediment succession from central Lake Ohrid, Balkan Peninsula, North Macedonia and Albania provided important insights into the regional climate history and evolutionary dynamics since permanent lacustrine conditions established at 1.36 million years ago (Ma). This paper focuses on the entire 584-m-long DEEP sediment succession and a comparison to a 197-m-long sediment succession from the Pestani site ~5 km to the east in the lake, where drilling ended close to the bedrock, to unravel the earliest history of Lake Ohrid and its basin development. 26Al/10Be dating of clasts from the base of the DEEP sediment succession implies that the sedimentation in the modern basin started at c. 2 Ma. Geophysical, sedimentological and micropalaeontological data allow for chronological information to be transposed from the DEEP to the Pestani succession. Fluvial conditions, slack water conditions, peat formation and/or complete desiccation prevailed at the DEEP and Pestani sites until 1.36 and 1.21 Ma, respectively, before a larger lake extended over both sites. Activation of karst aquifers to the east probably by tectonic activity and a potential existence of neighbouring Lake Prespa supported filling of Lake Ohrid. The lake deepened gradually, with a relatively constant vertical displacement rate of ~0.2 mm a−1 between the central and the eastern lateral basin and with greater water depth presumably during interglacial periods. Although the dynamic environment characterized by local processes and the fragmentary chronology of the basal sediment successions from both sites hamper palaeoclimatic significance prior to the existence of a larger lake, the new data provide an unprecedented and detailed picture of the geodynamic evolution of the basin and lake that is Europe’s presumed oldest extant freshwater lake. © 2022 The Authors. Boreas published by John Wiley & Sons Ltd on behalf of The Boreas Collegium.
2658.
The Chicxulub impact structure reveals the first in-situ Jurassic magmatic intrusions of the Yucatán Peninsula, Mexico
Lithos,
436-437
2023
Abstract: ▾ Impact events that create complex craters excavate mid- to lower-crustal rocks, offering a unique perspective on the interior composition and internal dynamics of planetary bodies. On the Yucatán Peninsula, Mexico, the surface geology mainly consists of ∼3 km thick sedimentary rocks, with a lack of exposure of crystalline basement in many areas. Consequently, current understanding of the Yucatán subsurface is largely based on impact ejecta and drill cores recovered from the 180–200-km-diameter Chicxulub impact structure. In this study, we present the first apatite and titanite U–Pb ages for pre-impact dacitic, doleritic, and felsitic magmatic dikes preserved in Chicxulub's peak ring sampled during the 2016 IODP-ICDP Expedition 364. Dating yielded two age groups, with Carboniferous dacites (328–318 Ma) and a felsite (330± 9 Ma) overlapping in age with most of the granitoid basement sampled in the Expedition 364 drill core, as well as Jurassic dolerites (169–159 Ma) and a felsite (158 ± 19 Ma) that represent the first in situ sampling of Jurassic-age magmatic intrusions for the Yucatán Peninsula. Further investigation of the Nd, Sr, and Hf isotopic compositions of these pre-impact lithologies and impact melt rocks from the peak ring structure suggest that dolerites generally contributed up to ∼10 vol% of the Chicxulub impact melt rock sampled in the peak ring. This percentage implies that the dolerites comprised a large part of the Yucatán subsurface by volume, representing a hitherto unsampled pervasive Jurassic magmatic phase. We interpret this magmatic phase to be related to the opening of the Gulf of Mexico, representing the first physical sampling of lithologies associated with the southern extension of the opening of the Gulf of Mexico and likely constraining its onset to the Late Middle Jurassic. © 2022 Elsevier B.V.
2657.
Terrestrial dominance of organic carbon in an Early Cretaceous syn-rift lake and its correlation with depositional sequences and paleoclimate
Sedimentary Geology,
455
2023
Keywords:▾
China; Songliao Basin; Alumina; Aluminum oxide; Deposition; Kerogen; Lakes; Oil shale; Stratigraphy; Weathering; Carbon concentrations; Carbon source; Chemical weathering; Littorals; Lower Cretaceous; Mudstone; Organic carbon burial; Paleoclimates; Rift basin; Syn-rift; chemical weathering; climate variation; correlation; Cretaceous; depositional sequence; lacustrine deposit; lake evolution; mudstone; organic carbon; paleoclimate; sequence stratigraphy; Organic carbon
Abstract: ▾ Organic carbon (OC) burial in lakes has been identified as an efficient sink in the global carbon cycle. Abundant input of terrestrial-derived OC leads to high variability in OC origin and type, but its role in determining organic-rich sediments has been overlooked in prior studies. Here, we investigated the OC source and concentration of the Lower Cretaceous (Middle Aptian to Lower Albian) Shahezi Formation (Songliao Basin, NE Asia) to reveal the burial of terrestrial OC in relation to syn-rift lake evolution and paleoclimate change. The sequence stratigraphic framework of fan-deltaic and lacustrine successions was established by identifying depositional facies and sequence boundaries. The lacustrine-dominated interval was further subdivided into four facies associations (i.e., lake shore to littoral siltstones, shallow-littoral mudstones, sublittoral, and profundal) and a few cyclic, parasequence-order packages, using 90 m of continuous cores and high sampling frequency of RoqSCAN SEM-EDS. Multiple independent proxies (macerals identified using correlative light and electron microscopy, pyrolysis indices, Ro, TOC/TN, and δ13Corg) suggest that the organic fraction of the highly mature mudstones was predominantly contributed by terrestrial-derived OC (gas-prone type III/IV kerogen). A direct correlation between depositional facies, chemical weathering proxies (CIA, CIAcorr, and Ln(Al2O3/Na2O)), and OC burial (TOC and HI) has been established. A steep syn-rift slope, a warm–humid climate, abundant vegetation, and the subaqueous transport of OC-bearing sediments (e.g., massive mud-rich conglomerates and sand- to pebble-bearing mudstones), may have jointly promoted the high input of terrestrial OC. A comparison between two Lower Cretaceous terrestrial records from high and low paleolatitudes suggests that the shift from the syn-rift to post-rift phase was accompanied by an increase in TOC concentration and a change toward Type I kerogen of aquatic origin. The tectonically-controlled evolution of rift basins might be an important forcing function for the change of OC sources and concentrations, which is responsible for long-term OC burial in hinterland environments. © 2023
2656.
Techanical properties and microscopic pore structure evolution mechanism of shale under deep well temperature and humidity environment (in Chinese with English abstract);[深井温湿环境下泥页岩力学特性及微观孔隙结构演化机制]
Exploration Engineering,
50
(S1)
126-134
2023
2655.
Multiple S-isotopic evidence for seawater incursions during the deposition of the upper Cretaceous source rocks in the Songliao Basin, northeastern China
Chemical Geology,
642
2023
2654.
Holocene variations in Lake Titicaca water level and their implications for sociopolitical developments in the central Andes
Proceedings of the National Academy of Sciences of the United States of America,
120
(2)
2023
Keywords:▾
Climate; Lakes; Water; biological marker; organic carbon; water; Andes; archeology; Article; cultural anthropology; environmental parameters; geochemical analysis; geographic and geological phenomena; geographic elevation; Holocene; human; lake; lake basin; lake sediment; lake water level; Late Holocene; Middle Holocene; paleoecology; paleoeshoreline; politics; population migration; scientist; shoreline; social evolution; stable isotope labeling; chemistry; climate
Abstract: ▾ Holocene climate in the high tropical Andes was characterized by both gradual and abrupt changes, which disrupted the hydrological cycle and impacted landscapes and societies. High-resolution paleoenvironmental records are essential to contextualize archaeological data and to evaluate the sociopolitical response of ancient societies to environmental variability. Middle-to-Late Holocene water levels in Lake Titicaca were reevaluated through a transfer function model based on measurements of organic carbon stable isotopes, combined with high-resolution profiles of other geochemical variables and paleoshoreline indicators. Our reconstruction indicates that following a prolonged low stand during the Middle Holocene (4000 to 2400 BCE), lake level rose rapidly ~15 m by 1800 BCE, and then increased another 3 to 6 m in a series of steps, attaining the highest values after ~1600 CE. The largest lake-level increases coincided with major sociopolitical changes reported by archaeologists. In particular, at the end of the Formative Period (500 CE), a major lake-level rise inundated large shoreline areas and forced populations to migrate to higher elevation, likely contributing to the emergence of the Tiwanaku culture. Copyright © 2023 the Author(s).
2653.
Milankovitch cycle identification of Denglouku Formation
in Songliao Basin and its paleoclimate significance (in Chinese with English abstract); [松科3井下白垩统登娄库组米兰科维奇旋回识别及其古气候意义]
Sedimentary Geology and Tethyan Geology
2023