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Thus, the diagenetic conditions under which aragonite-rich sediments convert to calcite-rich limestones are poorly understood. For example, in experiments with an F:S of 0. Our results also show that the amount of Mg incorporated into calcite products increases linearly with the increase of F:S. Collectively, these observations further point to F:S as an important factor in carbonate diagenesis with broad implications.

This leaves aragonite dissolution as the dominant diagenetic process in these environments, which may represent an underrated source Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA alkalinity to the open ocean.

Second, transformation from aragonite-rich sediments to the calcite-rich limestones that dominate the rock record is likely promoted by Hismanal (Astemizole (WITHDRAWN FROM US MARKET))- FDA decrease in the F:S and the development of a closed system during progressive burial.

Publisher WebsiteGoogle Scholar The stabilizing effect of high pore-fluid pressure along subduction megathrust faults: Evidence from friction experiments on accretionary sediments from the Nankai Trough John D. It is also thought to influence the nature of fault slip, particularly in subduction zones where areas of slow slip have been linked to regions of elevated pore-fluid pressure.

In the winter of 2018-19 the accretionary complex overlying the Nankai Trough subduction zone (SW Japan) was goutweed as part of Integrated Ocean Drilling Program (IODP) Expedition 358. Here we test the frictional stability of the accretionary sediments recovered during the Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA by performing a series of velocity-stepping experiments on powdered samples (to simulate fault gouge) while systematically varying the pore-fluid pressure Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA effective normal stress conditions.

In contrast, when the pore-fluid pressure is held constant and the effective normal stress is varied, there is minimal effect on the frictional stability of the gouge. The increase in frictional stability of the gouge at elevated pore-fluid pressure is caused by an evolution in the rate-and-state Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA b, which becomes more negative at high pore-fluid pressure.

These results have important implications for understanding the nature of slip in subduction zones and suggest the stabilizing effect percutaneous pore-fluid pressure could promote slow slip or aseismic creep on areas of the subduction interface that might otherwise experience earthquake rupture.

Carbonate phases in these crusts are methane-derived Mg-calcite and aragonite. We suggest the primary forcing affecting sulfate distillation is varying activity of anaerobic oxidation of methane coupled to sulfate reduction (AOM-SR) due to temporal changes in cold seep methane flux.

Publisher WebsiteGoogle Scholar Dilatancy stabilises shear failure in rock Franciscus M. When pore fluids are present and drainage is insufficient, dilation leads to pore pressure drops, which in turn Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA to strengthening of the material. We conducted laboratory rock fracture experiments with direct in-situ fluid pressure measurements which demonstrate that dynamic rupture propagation and fault slip can be stabilised (i.

We also observe that, for the same effective pressures but lower pore fluid pressures, the stabilisation process may be arrested when the pore fluid pressure approaches zero and vaporises, resulting in dynamic shear failure. In case of a stable rupture, we witness continued prolonged slip after the main failure event that is the result of pore pressure recharge of the fault zone. All our observations are quantitatively explained by a spring-slider model combining slip-weakening behaviour, slip-induced dilation, and pore fluid diffusion.

Using Vimizim (Elosulfase Alfa Injection for Intravenous Use)- FDA data in an inverse problem, we estimate diaphragmatic breathing technique key parameters controlling rupture stabilisation, fault dilation rate and fault zone storage. These estimates are used to make predictions for the pore pressure drop associated with faulting, and where in the crust we may expect dilatancy stabilisation or vaporisation during earthquakes.

For intact rock and well consolidated faults, we expect strong dilatancy strengthening between 4 and 6 km depth regardless of ambient pore pressure, and at greater depths when the ambient pore pressure approaches lithostatic pressure. Increasing evidence suggests that high-altitude discharges (lightning) in maturing plumes are driven by electrification processes that require the formation of ice (analogous to processes underpinning meteorological thunderstorms). However, electrical discharges are also common at or near the volcanic vent.

Here, we use a shock-tube to simulate overpressured volcanic jets capable of producing spark discharges in the absence of ice. These discharges may be representative of the continual radio frequency (CRF) emissions observed at a number of eruptions. Using a suite of electrostatic sensors, we demonstrate the presence of size-dependent bipolar charging (SDBC) in a discharge-bearing flow for the first time. SDBC has been readily associated with triboelectric charging in other contexts and provides direct evidence that contact and frictional electrification play significant roles in electrostatic processes in the vent and near-vent regions of an eruption.

Additionally, we find that particles leaving the region where discharges occur remain moderately electrified. This degree of electrification may be sufficient to drive near-vent lightning higher in the column.

Thus, near-vent discharges may be underpinned by the same electrification mechanisms driving CRF, albeit involving greater degrees of charge separation. Submissions will undergo normal external peer review.



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