The Impact of Depositional Events and Burial Rate On Carbonate-Silica Diagenesis In A Middle Jurassic Stromatactis Carbonate Mud Mound, Sainte-Baume Massif, Se France

2012 ◽  
Vol 82 (7) ◽  
pp. 521-539 ◽  
Author(s):  
M. Floquet ◽  
F. Neuweiler ◽  
P. Leonide
Keyword(s):  
Middle Jurassic ◽  
Silica Diagenesis ◽  
Burial Rate ◽  
The Impact ◽  
Se France

scholarly journals Evidence of high Sr/Ca in a Middle Jurassic murolith coccolith species

2020 ◽  
Author(s):  
Baptiste Suchéras-Marx ◽  
Fabienne Giraud ◽  
Alexandre Simionovici ◽  
Rémi Tucoulou ◽  
Isabelle Daniel
Keyword(s):  
Fluorescence Spectroscopy ◽  
Middle Jurassic ◽  
Photic Zone ◽  
X Ray ◽  
Continuous Record ◽  
The Common ◽  
Geochemical Analyses ◽  
Set Up ◽  
The Impact ◽  
Very High

Paleoceanographical reconstructions are often based on microfossil geochemical analyses. Coccoliths are the most ancient, abundant and continuous record of pelagic photic zone calcite producer organisms. Hence, they could be valuable substrates for geochemically based paleoenvironmental reconstructions but only Sr/Ca is exploited even if it remains poorly understood. For example, some murolith coccoliths species have very high Sr/Ca compared to the common 1-4 mmol/mol recorded in placolith coccoliths. In this study, we analyzed the elemental composition of the Middle Jurassic murolith Crepidolithus crassus by synchrotron-based nanoXRF (X-ray Fluorescence Spectroscopy) mapping focusing on Sr/Ca and compared the record to two placolith species, namely Watznaueria contracta and Discorhabdus striatus. In C. crassus, Sr/Ca is more than ten times higher than in both placoliths and seems higher in the proximal cycle. By comparison with the placoliths analyzed in the same analytical set-up and from the same sample, we exclude the impact of the diagenesis and seawater Sr/Ca to explain the high Sr/Ca in C. crassus. Based on comparisons to Pontosphaera discopora and Scyphosphaera apsteinii which also have high Sr/Ca, it seems more likely that high Sr/Ca in C. crassus is either due to the vertical elongation of the R-units of the proximal cycle or related to the action of the special polysaccharide controlling the growth of those vertically elongated R-units that may have affinities to Sr2+. In order to apply the Sr/Ca proxy to muroliths, further investigations are needed on cultured coccoliths.

scholarly journals The Global Boundary Stratotype Section and Point (GSSP) for base of the Bathonian Stage (Middle Jurassic), Ravin du Bès Section, SE France

Episodes ◽  
2009 ◽  
Vol 32 (4) ◽  
pp. 222-248 ◽  
Author(s):  
Sixto Rafael Fernández-López ◽  
Giulio Pavia ◽  
Elisabetta Erba ◽  
Myette Guiomar ◽  
Maria Helena Henriques ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Stratotype Section ◽  
Se France

scholarly journals Retribusi Pemakaman Etnis Tionghoa Kota Padang 1989-2016

2019 ◽  
Author(s):  
Novika Restu Pratiwi ◽  
Erniwati Erniwati ◽  
Zul Asri
Keyword(s):  
Local Government ◽  
Chinese People ◽  
Local Regulation ◽  
Burial Rate ◽  
Chinese Ethnicity ◽  
The Government ◽  
The Impact ◽  
Burial Grounds

This article aims to explain the wisdom of the government towards the burial of Chinese ethnicity and the impact of unstable funeral fees. The results of this study were in 1989. The local government of Padang City had provided a burial place for the Chinese in Bungus Teluk Kabung. There were two locations provided by the local government of Padang City, the first was not paying and the second had to pay, but the implementation was not paid is not in accordance with the tradition of Chinese ethnic funerals. Finally, the Chinese chose a place where the location was in accordance with their funeral traditions even though they had to pay. Initially, the paid Chinese cemetery complex was initially paid at a standard price, but after the Local Regulation Number 11 of 2011 was enacted in 2012, the Chinese have difficulty obtaining burial grounds because of the expensive price of the standard 1 x 2 tomb The meter is only Rp125 thousand for one grave, plus the burial fee of Rp375 thousand. This means that for one time the burial rate is only Rp500 thousand. Chinese people tend to spend land reaching 4 x 6 meters or more than 22 square meters. The excess land rates are Rp250 thousand per meter. Therefore, Chinese ethnic funeral levies can reach Rp5 to Rp6 million / two years. As a result, there are changes in the traditions of the Chinese ethnic, where those who initially tend to bury their families so that they choose cremation, because this cremation is considered to reduce costs.

scholarly journals Émergence de la production carbonatée pélagique au Jurassique moyen (180-160 Ma) : la conquête des océans par les coccolithophoridés du genre Watznaueria

2020 ◽  
Author(s):  
Baptiste Suchéras-Marx
Keyword(s):  
Calcium Carbonate ◽  
Carbon Cycle ◽  
Carbon Cycling ◽  
Carbon Isotope ◽  
Middle Jurassic ◽  
Marine Algae ◽  
Southern France ◽  
Carbon Isotope Ratios ◽  
The Impact ◽  
First Time

Coccolithophorids are photosynthetic and planktonic marine algae that produce micrometric calcium carbonate (CaCO3) platelets called coccoliths. These algae appeared about 210 Ma ago and produce today most of the CaCO3 in the modern oceans, hence playing a major role in the carbon cycle. Nevertheless, the onset of oceanic CaCO3 production by these organisms during the Jurassic and its impact on carbon cycling remain poorly understood. This study therefore focused on the Middle Jurassic interval (Early Bajocian, -170 Ma) which records the diversification of Watznaueria, an evolutionary important coccolith genus that subsequently dominated oceanic CaCO3 production for more than 80 Myr. The analysis of coccolith assemblages from the Middle Jurassic of southern France and Portugal, based on an automatic coccolith recognition device used for the first time on Jurassic coccoliths, allowed quantifying the impact of this diversification on CaCO3 production. In addition, the duration of this key interval has been revaluated by the cyclostratigraphic analysis of sedimentary strata from southern France. The reconstructed changes in CaCO3 production were compared to carbon cycle perturbations recorded by carbon isotope ratios and indicate a probable link with a marked increase of ocean fertility. Besides, paleontological analyses show that this diversification episode correspond to the successive appearance of different, probably opportunistic Watznaueria species. The obtained fluxes of pelagic CaCO3 production, by far lower than those recorded in modern oceans, seems too low to have significantly impacted the Middle Jurassic carbon cycle.

The Don Field, Blocks 211/13a, 211/14, 211/18a, 211/19a, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 89-93 ◽  
Author(s):  
D. Morrison ◽  
G. G. Bennet ◽  
M. G. Bayat
Keyword(s):  
Development Strategy ◽  
North Sea ◽  
Middle Jurassic ◽  
Reservoir Quality ◽  
Western Margin ◽  
Reservoir Performance ◽  
Development Plans ◽  
Phased Development ◽  
The Impact ◽  
Systematic Reduction

AbstractThe Don Oilfield is located towards the western margin of the Viking Graben. It lies within four UKCS Blocks, 211/13a, 211/14, 211/18a, and 211/19a, some 15 km (9 miles) north of the Thistle Field. The field is structurally complex and consists of two discrete accumulations (Don NE and Don SW) which are separated by a WNW-ESE fault. The oil is trapped in sandstones of the Middle Jurassic Brent Group at depths of between 11 000 and 11 500 ft SS. Reservoir quality is variable with the Etive and Ness formations which contain the most productive intervals.The Field is structurally complex and reservoir quality is highly variable. In order to minimize the impact of these uncertainties a phased development strategy has been adopted. This approach ensures the systematic reduction of risk and allows for flexibility to modify development plans as additional reservoir performance data is acquired.

scholarly journals Formal proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin du Bès Section (Bas-Auran, SE France)

2009 ◽  
Vol 102 (2) ◽  
pp. 271-295 ◽  
Author(s):  
Sixto R. Fernández-López ◽  
Giulio Pavia ◽  
Elisabetta Erba ◽  
Myett Guiomar ◽  
Maria H. Henriques ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Se France

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

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