All ICDP Publications with Abstracts
From parent-sysfolder "Publications" + 2 folder-levels deep
2819.
Parapatric speciation of <i>Meiothermus</i> in serpentinite-hosted
aquifers in Oman
FRONTIERS IN MICROBIOLOGY,
14
2023
Keywords:▾
subsurface; serpentinite; recombination; evolution; geographic
isolation; parapatric speciation; dispersal limitation; competitive
exclusion
2818.
Paleolimnological responses of Ecuadorian páramo lakes to local and regional stressors over the last two millennia
Journal of Paleolimnology
2023
Abstract: ▾ Increasing surface air temperatures and human influences (e.g., agriculture, livestock grazing, tourism) are altering lacustrine ecosystems in the South American Andean páramo, and these influences are evident in changes in the diatom-species composition in sediment cores from the region that span the last ~ 150 years. Existing studies are limited by their short temporal scales and limited spatial extent. We analyzed two sediment cores spanning the last two millennia from the northern (Laguna Piñan) and southern (Laguna Fondococha) Andean páramo of Ecuador to provide a longer-term perspective on lake dynamics. Both lakes show shifts in the dominant diatoms through time. Fondococha diatoms shifted in dominance between two Aulacoseira species and in the planktic to benthic ratio, and these shifts are interpreted as evidence of changing lake level. The inferred shifts are corroborated by changes in sediment geochemistry. Piñan shows a directional shift in the diatom assemblage over the period of the record, from benthic diatoms tolerant of high dissolved organic carbon (DOC), low pH, and low nutrients, to an assemblage characteristic of lower DOC, Melina use only one higher for pH, nutrients and lake levels. Shifts in Piñan’s diatoms are correlated with tephra layers in the sediment, suggesting that local volcanic deposition may have been responsible for altering the catchment and lake geochemistry. This is supported by relatively high δ13C values in organic matter associated with tephra layers, which become more negative up-section. Our study suggests that remote lakes in spatially heterogenous montane regions act as sentinels of different facets of environmental change and provide insights into Andean ecosystem responses to environmental perturbations. © 2023, The Author(s), under exclusive licence to Springer Nature B.V.
2817.
Paleolakes of Eastern Africa: Zeolites, Clay Minerals, and Climate
Elements,
19
(2)
96 – 103
2023
Keywords:▾
East African Rift; Alkalinity; Climate change; Lakes; Zeolites; Alkalines; Changing climate; Climate; Climate condition; Condition; East African Rift; Eastern Africa; High pH; Paleolake; Rift systems; clay mineral; climate change; lake water; paleoclimate; paleoenvironment; water chemistry; zeolite; Clay minerals
Abstract: ▾ The eastern branch of the East African Rift System hosts many shallow modern lakes and paleolakes, which can be sensitive recorders of changing climate conditions (complicated by tectonics) during the past few million years. However, many of such lakes are saline–alkaline (salty and high pH), and these conditions do not easily preserve pollen and other biologically derived paleoclimate indicators. Fortunately, some preserved minerals that formed in these extreme environments reflect subtle shifts in lake water chemistry (controlled by changes in climate conditions) and therefore provide a continuous record of local and regional climate change. We present two different mineral proxies (zeolites and clays) from two different paleolake basins (Olduvai Gorge, Tanzania, and Chew Bahir, Ethiopia) as examples. © 2023 Mineralogical Society of America. All rights reserved.
2816.
Paleoenvironmental changes across the Mesozoic-Paleogene hyperthermal
events
GLOBAL AND PLANETARY CHANGE,
222
2023
Keywords:▾
Mesozoic -Paleogene; Hyperthermal events; Climate change;
Paleoenvironment
2815.
Special Issue on Ophiolites and Oceanic Lithosphere
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,
128
(4)
2023
2814.
Paleo-Permeability Structure of the Crustal Section of the Samail Ophiolite Based on Automated Detection of Veins in X-Ray CT Core Images From the Oman Drilling Project
Geochemistry, Geophysics, Geosystems,
24
(6)
2023
2813.
Significance of Secondary Fe-Oxide and Fe-Sulfide Minerals in Upper Peak Ring Suevite from the Chicxulub Impact Structure
Minerals,
13
(3)
2023
2812.
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
2811.
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
2810.
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
2809.
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.
2808.
Magma is the Key to Sustainable Super-Hot Geothermal Energy
Volume 47
,
Page 2868 – 2882
2023
2807.
Workshop report: PlioWest -- drilling Pliocene lakes in western North America
Scientific Drilling,
3261-72
2023
2806.
Workshop on drilling the Nicaraguan lakes: bridging continents and oceans (NICA-BRIDGE)
Scientific Drilling,
3273-84
2023
2805.
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
2804.
Volcanic impact on terrestrial and aquatic ecosystems in the Eastern Mediterranean
Communications Earth and Environment,
4
(1)
2023
2803.
Unlocking national treasures: the core scanning approach
Geological Society Special Publication,
527
(1)
77 – 94
2023
2802.
Underrepresentation of Local Researchers in Geophysical Studies at the Bosumtwi Impact Crater: Insights from A Systematic Review
Scientific African,
21
2023
2801.
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.
2800.
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
2799.
The response of borehole water levels in an ophiolitic, peridotite aquifer to atmospheric, solid Earth, and ocean tides
Journal of Hydrology X,
21
2023
2798.
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
2797.
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.
2796.
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.
2795.
The effect of temperature on the nonlinear elasticity of a fault rock in dynamic acoustoelastic testing (DAET) experiments
Geophysical Journal International,
235
(1)
554 – 565
2023