scholarly journals HIATUS PADA KALA EOSEN-MIOSEN TENGAH DI TINGGIAN ROO, SAMUDRA HINDIA, BERDASARKAN BIOSTRATIGRAFI NANNOPLANKTON

2016 ◽  
Vol 6 (3) ◽  
Author(s):  
Mimin Karmini ◽  
M. Hendrizan
Keyword(s):  
Late Miocene ◽  
Coal Gasification ◽  
Outer Part ◽  
Emiliania Huxleyi ◽  
Piston Core ◽  
Sea Floor ◽  
The Core ◽  
Authigenic Mineral ◽  
Plastic Industry ◽  
Gephyrocapsa Oceanica

Nanoplankton dari dua puluh satu percontoh dari Tinggian Roo (MD982156) yang diperoleh selama Ekspedisi MD III - IMAGES IV telah dianalisis untuk kepentingan penelitian biostratigrafi study. Percontoh sedimen diambil dengan menggunakan penginti isap yang besar sekali (giant piston core). Lokasi daerah telitian adalah di Tinggian Roo, Samudra Hindia, Selatan Jawa Timur, di luar Parit Jawa. Hasil penelitian menunjukkan bahwa berdasarkan nanoplankton, biostratigrafi daerah telitian dapat dibagi ke dalam 8 Zona yakni zona-zona: Discoaster multiradiatus, D. prepentaradiatus, D. asymmetricus, Pseudoemiliania lacunosa, D. brouweri, D.brouweri-oceanica, Gephyrocapsa oceanica dan Emiliania huxleyi. Umur Paleosen ditunjukkan dengan adanya Discoaster multiradiatus sebagai spesies yang dominan, sedangkan sedimen yang berumur Miosen Akhir adalah D. prepentaradiatus. Sedimen lempung tufaan pada kedalaman 30 m bawah dasar laut ke bagian paling bawah dari penampang yang didominasi oleh mineral Phillipsite, ternyata mengandung nanoplankton yang berumur Paleosen, sedangkan dari kedalaman 30 m ke bagian atas dari penampang sedimen ditutupi secara langsung oleh sedimen yang berumur Miosen Akhir – Holosen. Jadi di lokasi penelitian ini telah terjadi hiatus antara Eosen sampai paling tidak bagian bawah dari Miosen Akhir. Adapun Phillipsit dikenal sebagai mineral yang secara authigenic terjadi di laut dalam yang bisa berasal dari hasil kegiatan gunung api. Manfaat mineral Phillipsit di dalam industri plastik, antara lain dapat dipakai dalam pembuatan resin termoaktif dan sebagai pemacu dalam proses pengerasan. Kelompok Zeolit ini juga digunakan untuk menghilangkan kesadahan dalam industri deterjen, menjernihkan kelapa sawit, menyerap zat warna pada minyak hati ikan hiu, sebagai katalisator pada proses gasifikasi batubara yang berkadar belerang dan/atau nitrogen tinggi yang menghasilkan gas bersih Kata Kunci: Hiatus, Kala Esosen-miosen, Tinggian Roo, Biostratigrafi Nanno Plankton Nannoplankton of twenty one samples from Roo Rise (MD982156 core) obtained during MD III - IMAGES IV Expedition were analysed for biostratigraphic study. The samples were taken by using giant piston core. This core is located in Indian Ocean, south of East Jawa, outer part of Jawa Trench. The results of the study indicate that, based on nannoplankton biostratigraphy of the study area, there are eight zones namely: Discoaster multiradiatus, D. prepentaradiatus, D. asymmetricus, Pseudoemiliania lacunosa, D. brouweri, D.brouweri-oceanica, Gephyrocapsa oceanica dan Emiliania huxleyi. Paleocene sediment is indicated by the presence of Discoaster multiradiatus as the dominant species and Late Miocene sediment is indicated by the presence D. pentaradiatus. The sediments from 30 m down to the base of the core, which is dominated by Phillipsite minerals (Zeolite Group), is composed of nannoplankton of Paleocene age, whereas from 30 m below sea floor (bsf) to the top of the core, the sediment is directly overlain by the sediment of Late Miocene – Holocene ages. Therefore there was a hiatus occurred in the study area between Eocene to at least the lower part of Late Miocene. Phillipsite is known as an authigenic mineral deposited in the deep sea that could be derived from the volcanic activity products. This mineral has a benefit in the plastic industry that can be used in making thermoactive resin and as a catalyst in hardening process. The Zeolite Group is also used in removing hardness in detergen industry, cleaning palm oil, absorbing color in lever oil of shark and as a catalyst in coal gasification having high sulphur and nitrogen producing clean gas. Keyword: Hiatus, Eosen-miosen ages, Roo Rise, Biostratigrafi Nanno Plankton

The westward drift of the Earth's magnetic field

1950 ◽  
Vol 243 (859) ◽  
pp. 67-92 ◽  
Keyword(s):  
Magnetic Field ◽  
Secular Variation ◽  
Outer Part ◽  
Earth’S Magnetic Field ◽  
Dynamo Theory ◽  
The Core ◽  
The Earth ◽  
Earth's Magnetic Field ◽  
Harmonic Analyses ◽  
Westward Drift

The westward drift of the non-dipole part of the earth’s magnetic field and of its secular variation is investigated for the period 1907-45 and the uncertainty of the results discussed. It is found that a real drift exists having an angular velocity which is independent of latitude. For the non-dipole field the rate of drift is 0.18 ± 0-015°/year, that for the secular variation is 0.32 ±0-067°/year. The results are confirmed by a study of harmonic analyses made between 1829 and 1945. The drift is explained as a consequence of the dynamo theory of the origin of the earth’s field. This theory required the outer part of the core to rotate less rapidly than the inner part. As a result of electromagnetic forces the solid mantle of the earth is coupled to the core as a whole, and the outer part of the core therefore travels westward relative to the mantle, carrying the minor features of the field with it.

scholarly journals n-Nonacosadienes from the marine haptophytes Emiliania huxleyi and Gephyrocapsa oceanica

2015 ◽  
Vol 111 ◽  
pp. 107-113 ◽  
Author(s):  
Hideto Nakamura ◽  
Ken Sawada ◽  
Hiroya Araie ◽  
Iwane Suzuki ◽  
Yoshihiro Shiraiwa
Keyword(s):  
Emiliania Huxleyi ◽  
Gephyrocapsa Oceanica

The Coal Chemical Industry and Technology Innovation Service System Research Review

2011 ◽  
Vol 396-398 ◽  
pp. 1164-1169
Author(s):  
Xun Lian Si ◽  
Shu Xia Song
Keyword(s):  
Chemical Industry ◽  
Coal Gasification ◽  
Service System ◽  
Chain Extension ◽  
Research Review ◽  
System Construction ◽  
Industry Chain ◽  
The Core ◽  
Technological Chain ◽  
Oil Crisis

The vaporization and liquefied coal has important value to answer oil crisis for us, in technological chain support ,The coal chemical industry chain extension dependent on coal chemical industry innovation service system construction. In this paper,the author settled the coal chemical industry and technological innovation service system construction of research and development present situation, puts forward a ultimate extension of the technological chain is mature coal gasification technology, in industry chain the core industry is coal gas industry in the future,While improving the coal chemical industry innovation service system can effectively support technological chain the realization of the goal technique, also can promote the formation of the core industry chain.

Liquid-Saturated Hydrocarbons Resulting from Pyrolysis of the Marine Coccolithophores Emiliania huxleyi and Gephyrocapsa oceanica

1999 ◽  
Vol 1 (4) ◽  
pp. 346-352 ◽  
Author(s):  
Qingyu Wu ◽  
Yoshihiro Shiraiwa ◽  
Hiroshi Takeda ◽  
Guoying Sheng ◽  
Jiamo Fu
Keyword(s):  
Emiliania Huxleyi ◽  
Saturated Hydrocarbons ◽  
Gephyrocapsa Oceanica

scholarly journals Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland

2018 ◽  
pp. 39-64
Author(s):  
Morten Bjerager ◽  
Claus Kjøller ◽  
Mette Olivarius ◽  
Dan Olsen ◽  
Niels H. Schovsbo
Keyword(s):  
Oxygen Depletion ◽  
Upper Jurassic ◽  
High Density ◽  
Core Analysis ◽  
Reservoir Properties ◽  
East Greenland ◽  
Sea Floor ◽  
The Core ◽  
Trace Metal Content ◽  
Porosity And Permeability

The fully cored Blokelv-1 borehole was drilled through Upper Jurassic strata in the central part of the Jameson Land Basin, central East Greenland. The borehole reached a total depth of 233.8 m with nearly 100% recovery of high-quality core. An extensive analytical programme was undertaken on the core; sedimentological interpretation and reservoir characterisation were based on facies analysis combined with conventional core analysis, bulk geochemistry and spectral gamma and density scanning of the core. The Upper Jurassic Hareelv Formation was deposited in relatively deep water in a slope-to-basin setting where background sedimentation was dominated by suspension settling of organic-rich mud in oxygen-depleted conditions. Low- and high-density gravity-flow sandstone interbeds occur throughout the cored succession. About two-thirds of the high-density turbidite sandstones were remobilised and injected into the surrounding mud-rock. The resulting succession comprises nearly equal amounts of mudstones and sandstones in geometrically complex bodies. Ankerite cementation occurs in 37% of the analysed sandstones in varying amounts from minor to pervasive. Such ankerite-cemented sandstones can be identified by their bulk geochemistry where Ca > 2 wt%, Mg > 1 wt% and C > 1 wt%. The analysed mudstones are rich in Al, Fe, Ti and P and poor in Ca, Mg, Na and Mn. The trace-metal content shows a general increase in the upper part of the core reflecting progressive oxygen depletion at the sea floor. The reservoir properties of the Blokelv-1 sandstones were evaluated by both conventional core analysis and using log-derived porosity and permeability curves. The high-density turbidite beds and injectite bodies are a few centimetres to several metres thick and show large variations in porosity and permeability, in the range of 6–26 % for porosity and 0.05–400 mD for permeability. Individual sandstone units that are 1–7 m thick yield a net vertical reservoir thickness of 40 m with porosities of 15–26% and permeabilities of 1–200 mD. Heterolithic sandstone–mudstone units are generally characterised by poor reservoir quality with porosities of 2–14% and permeabilities of 0.1–0.6 mD.

scholarly journals A niche comparison of <i>Emiliania huxleyi</i> and <i>Gephyrocapsa oceanica</i> and potential effects of climate change

2018 ◽  
Author(s):  
Natasha A. Gafar ◽  
Kai G. Schulz
Keyword(s):  
Climate Change ◽  
Austral Summer ◽  
Original Data ◽  
Emiliania Huxleyi ◽  
Boreal Summer ◽  
Boreal Winter ◽  
Change Scenario ◽  
Carbonate Chemistry ◽  
Co2 Levels ◽  
Gephyrocapsa Oceanica

Abstract. Coccolithophore responses to changes in carbonate chemistry speciation such as CO2 and H+ are highly modulated by light intensity and temperature. Here we fit an analytical equation, accounting for simultaneous changes in carbonate chemistry speciation, light and temperature, to published and original data for Emiliania huxleyi, and compare the projections with those for Gephyrocapsa oceanica. Based on our analysis, the two most abundant coccolithophores in today’s oceans appear to be adapted for a similar fundamental light niche but slightly different ones for temperature and CO2, with E. huxleyi having a tolerance to lower temperatures and higher CO2 levels than G. oceanica. Based on growth rates, a dominance of E. huxleyi over G. oceanica is projected below temperatures of 22 °C at current atmospheric CO2 levels. This is similar to a global surface sediment compilation of E. huxleyi and G. oceanica coccolith abundances suggesting temperature dependent dominance shifts. For a future RCP 8.5 climate change scenario (1000 μatm fCO2 and +4.8 °C) we project a niche contraction for G. oceanica then being restricted to regions of even higher temperatures. Finally, we compare satellite derived particulate inorganic carbon estimates in the surface ocean with a recently proposed metric for potential coccolithophore success on the community level i.e. the temperature, light and carbonate chemistry dependent CaCO3 production potential (CCPP). Excluding the Antarctic province from the analysis we found a good correlation between CCPP and satellite derived PIC in the other regions with an R2 of 0.73 for Austral winter/Boreal summer and 0.85 for Austral summer/Boreal winter.

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