The Habitat of the Nascent Chicxulub Crater
Timothy J. BralowerJulie CosmidisMatthew S. FantleChristopher M. LoweryBenjamin H. PasseyS. P. S. GulickJoanna MorganVivi VajdaMichael T. WhalenA. WittmannN. A. ArtemievaK. A. FarleySteven GoderisElizabeth HajekPeter J. HeaneyD. A. KringShelby LyonsCornelia RasmussenElizabeth C SibertFrancisco J. Rodríguez‐TovarGordon Turner‐WalkerJames C. ZachosJ. CarteS. A. ChenCharles S. CockellMarco J. L. CoolenKatherine H. FreemanJoshua M. GarberM Alonso GonzálezJennifer L. GrayKliti GriceHeather JonesBettina SchaeferJan SmitSonia M. Tikoo-Schantz
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Abstract An expanded sedimentary section provides an opportunity to elucidate conditions in the nascent Chicxulub crater during the hours to millennia after the Cretaceous‐Paleogene (K‐Pg) boundary impact. The sediments were deposited by tsunami followed by seiche waves as energy in the crater declined, culminating in a thin hemipelagic marlstone unit that contains atmospheric fallout. Seiche deposits are predominantly composed of calcite formed by decarbonation of the target limestone during impact followed by carbonation in the water column. Temperatures recorded by clumped isotopes of these carbonates are in excess of 70°C, with heat likely derived from the central impact melt pool. Yet, despite the turbidity and heat, waters within the nascent crater basin soon became a viable habitat for a remarkably diverse cross section of the food chain. The earliest seiche layers deposited with days or weeks of the impact contain earliest Danian nannoplankton and dinocyst survivors. The hemipelagic marlstone representing the subsequent years to a few millennia contains a nearly monogeneric calcareous dinoflagellate resting cyst assemblage suggesting deteriorating environmental conditions, with one interpretation involving low light levels in the impact aftermath. At the same horizon, microbial fossils indicate a thriving bacterial community and unique phosphatic fossils including appendages of pelagic crustaceans, coprolites and bacteria‐tunneled fish bone, suggesting that this rapid recovery of the base of the food chain may have supported the survival of larger, higher trophic‐level organisms. The extraordinarily diverse fossil assemblage indicates that the crater was a unique habitat in the immediate impact aftermath, possibly as a result of heat and nutrients supplied by hydrothermal activity.Keywords:
Seiche
Marl
Paleogene
Bioerosion
The water-level curves from 20 tide-gauge stations along the coasts of Bohai and Yellow Seas were collected.The seiche parameters were selected according to these water-level curves obtained.These data,especially the seiches with relatively large amplitudes,were examined by using statistics and natural period analysis.Basic chracteristics of seiches,such as monthly and annual occurrences,oscillation period, occurrence duration and occurrence time of the peak,were derived. Among these 20 tide-gauge stations, seiches with an amplitude of no less than 50 cm were found at 13 of them. The seiche occurs mostly in June and July.Among the total 147 seiche events, there are 33 sets(or events) with an amplitude greater than 80 cm, and the greatest amplitude is 293 cm. The occurrence of seiches has local and seasonal characters, and interannual variations. The seiches with a large amplitude occur mostly in summer.It basically does not occur in winter.Numbers of the annual occurrence of the seiches with a relatively large amplitudes are not constant and vary randomly in different years.The natural period of fundamental mode calculated by the improvement on Merians formula coincides well with the period estimated from the curve of observational water level except for one of the bays. Observations show that the greatest amplitude of each seiche event occurs mostly during high or low tide.This study shows that the fine coordination of rapid variation of atmospheric pressure,wind speed and direction are main causes of the formation of the seiches with large amplitudes.
Seiche
Tide gauge
Oscillation (cell signaling)
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Morskie osady paleogenu miedzy Glogowem a Sierszowicami (Dolny Śląsk – Polska)
On the basis of lithology and microfauna marine sediments of Upper Eocene, Lower Oligocene and Upper Oligocene in the Glogow — Sieroszowice region ате stated. They are clastic sediments with intercalation of limestones, sandy glauconitic limestones and marls separated by erosional surface.
Marl
Paleogene
Lithology
Microfauna
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Seiche
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Abstract. Seiches are often considered a transitory phenomenon wherein large amplitude water level oscillations are excited by a geophysical event, eventually dissipating some time after the event. However, continuous small-amplitude seiches have recently been recognized presenting a question as to the origin of continuous forcing. We examine 6 bays around the Pacific where continuous seiches are evident, and based on spectral, modal and kinematic analysis suggest that tidally-forced shelf-resonances are a primary driver of continuous seiches.
Seiche
Forcing (mathematics)
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Seiche
Open sea
Open water
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In Denbighshire the Marl follows the productive Middle Coal Measures and consists of from 400–1,100 feet of red, green, and variegated marls with occasional sandstones and towards the top thin Spirorbis limestone and other limestones, with here and there films of coal. It corresponds with the Etruria Marl of the North Staffordshire Coalfield.
Marl
Coal measures
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Seiche
Oscillation (cell signaling)
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We analyzed season-long water level records at 12 stations around the Lake of Geneva (local name Léman) for evidence of internal seiches modified by Coriolis force and compared the results with predictions from a two-layer numerical model with real bottom topography for typical wind situations. Results are also compared with those obtained from current and temperature measurements in the lake. Agreement was satisfactory in all cases. Model predictions and measurements both indicated that only three internal seiche modes are excited: the 1st mode and the 3rd mode, which are Kelvin-seiche oscillations, and the 12th mode, which is a Poincaré seiche. The model, driven by winds from different directions, demonstrates that the wind field, constrained by the local topography, determines which of the modes is generated.
Seiche
Mode (computer interface)
Kelvin wave
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