RSS 1.0Geology and Geophysics (G&G)
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Scientists in the G&G Department seek knowledge of the structure, composition, and dynamics of the earth’s interior, the origin and evolution of the earth’s crust, controls on ocean and climate change on time scales of decades to 100 million years, and processes of mass and energy transfer at the land-sea interface.
Recent Submissions
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An intermittent detachment faulting system with a large sulfide deposit revealed by multi-scale magnetic surveys
(Nature Research, 2021-09-24)Magmatic and tectonic processes can contribute to discontinuous crustal accretion and play an important role in hydrothermal circulation at ultraslow-spreading ridges, however, it is difficult to accurately describe the ... -
Reorganized atmospheric circulation during the little ice age leads to rapid Southern California deoxygenation
(American Geophysical Union, 2021-07-16)The magnitude of natural oceanic dissolved oxygen (DO) variability remains poorly understood due to the short duration of the observational record. Here we present a high-resolution (4–9 years) reconstruction of the Southern ... -
Upper mantle hydration indicated by decreased shear velocity near the Southern Mariana Trench from Rayleigh wave tomography
(American Geophysical Union, 2021-07-26)Reduction of seismic velocities has been employed to study the hydration of incoming plates and forearc mantle in recent years. However, few constraints have been obtained in the Southern Mariana Trench. We use an ocean ... -
Characterizing energy flow in kelp forest food webs: a geochemical review and call for additional research
(Wiley Open Access, 2021-09-01)Kelp forests are highly productive coastal habitats that serve as biodiversity hotspots and provide valuable ecosystem services. Despite being one the largest marine biomes, kelp forests have been drastically understudied ... -
Highlighting the biotechnological potential of deep oceanic crust fungi through the prism of their antimicrobial activity
(MDPI, 2021-07-24)Among the different tools to address the antibiotic resistance crisis, bioprospecting in complex uncharted habitats to detect novel microorganisms putatively producing original antimicrobial compounds can definitely increase ... -
On the estimation of deep Atlantic ventilation from fossil radiocarbon records. Part II: (in)consistency with modern estimates
(American Meteorological Society, 2021-08-01)Measurements of radiocarbon concentration (Δ14C) in fossil biogenic carbonates have been interpreted as reflecting a reduced ventilation of the deep Atlantic during the last ice age. Here we evaluate the (in)consistency ... -
Hydraulic transmissivity inferred from ice-sheet relaxation following Greenland supraglacial lake drainages
(Nature Research, 2021-06-25)Surface meltwater reaching the base of the Greenland Ice Sheet transits through drainage networks, modulating the flow of the ice sheet. Dye and gas-tracing studies conducted in the western margin sector of the ice sheet ... -
Thallium isotope fractionation during magma degassing: evidence from experiments and Kamchatka arc lavas
(American Geophysical Union, 2021-04-19)Thallium (Tl) isotope ratios are an emerging tool that can be used to trace crustal recycling processes in arc lavas and ocean island basalts (OIBs). Thallium is a highly volatile metal that is enriched in volcanic fumaroles, ... -
Remineralization dominating the δ13 C decrease in the mid-depth Atlantic during the last deglaciation
(Elsevier, 2021-07-20)δ 13 C records from the mid-depth Atlantic show a pronounced decrease during the Heinrich Stadial 1 (HS1), a deglacial episode of dramatically weakened Atlantic Meridional Ocean Circulation (AMOC). Proposed explanations ... -
The mechanical response of a magma chamber with poroviscoelastic crystal mush
(American Geophysical Union, 2021-01-28)Improved understanding of the impact of crystal mush rheology on the response of magma chambers to magmatic events is critical for better understanding crustal igneous systems with abundant crystals. In this study, we ... -
Constraints on the depth, thickness, and strength of the G Discontinuity in the Central Pacific from S Receiver Functions
(American Geophysical Union, 2021-03-09)The relative motion of the lithosphere with respect to the asthenosphere implies the existence of a boundary zone that accommodates shear between the rigid plates and flowing mantle. This shear zone is typically referred ... -
Stacked magma lenses beneath mid-ocean ridges: insights from new seismic observations and synthesis with prior geophysical and geologic findings
(American Geophysical Union, 2021-03-24)Recent multi-channel seismic studies of fast spreading and hot-spot influenced mid-ocean ridges reveal magma bodies located beneath the mid-crustal Axial Magma Lens (AML), embedded within the underlying crustal mush zone. ... -
Spectral analysis of vertical temperature profile time-series data in Yellowstone Lake sediments
(American Geophysical Union, 2021-03-17)We use yearlong vertical temperature profile time-series (seven thermistors at evenly spaced depth intervals from 10 to 70 cm) from five sites in and around the Deep Hole thermal area, southeast of Stevenson Island, ... -
Hydroclimate dipole drives multi-centennial variability in the western tropical North Atlantic Margin during the middle and late Holocene
(American Geophysical Union, 2021-07-05)Meridional shifts of the North Atlantic Subtropical High (NASH) western edge create a dipole that drives hydroclimate variability in the southeastern United States and Caribbean region. Southwest displacements suppress ... -
An operational overview of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) Northeast Pacific field deployment
(University of California Press, 2021-07-07)The goal of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding of the export, fate, and carbon cycle impacts of global ocean net primary production. To ... -
Risk averse choices of managed beach widths under environmental uncertainty
(Wiley, 2021-07-26)Applying a theoretical geo-economic approach, we examined key factors affecting decisions about the choice of beach width when eroded coastal beaches are being nourished (i.e., when fill is placed to widen a beach). Within ... -
Annually resolved sediments in the classic Clarkia lacustrine deposits (Idaho, USA) during the middle Miocene Climate Optimum
(Geological Society of America, 2021-04-15)The world-renowned Miocene Clarkia paleolake in northern Idaho (USA) is closely associated with Columbia River Basalt Group volcanism. The flood basalt dammed a local drainage system to form the paleolake, which preserved ... -
Community science for coastal acidification monitoring and research
(Taylor and Francis, 2021-07-26)Ocean and coastal acidification (OCA) present a unique set of sustainability challenges at the human-ecological interface. Extensive biogeochemical monitoring that can assess local acidification conditions, distinguish ... -
Assessing the statistical uniqueness of the Younger Dryas: a robust multivariate analysis
(European Geosciences Union, 2021-06-30)During the last glacial period (ca. 120–11 kyr BP), dramatic temperature swings, known as Dansgaard–Oeschger (D–O) events, are clearly manifest in high-resolution oxygen isotope records from the Greenland Ice Sheet. Although ... -
Deltas in arid environments
(MDPI, 2021-06-16)Due to increasing water use, diversion and salinization, along with subsidence and sea-level rise, deltas in arid regions are shrinking worldwide. Some of the most ecologically important arid deltas include the Colorado, ...
