A GEOCHEMICAL METHOD FOR ASSESSMENT OF THE THERMAL HISTORIES OF SEDIMENTS: A TWO-WELL CASE STUDY FROM THE GIPPSLAND BASIN, AUSTRALIA

1991 ◽  
Vol 31 (1) ◽  
pp. 325 ◽  
Author(s):  
R. Alexander ◽  
P.G. Kralert ◽  
R. Marzi ◽  
R.I. Kagi ◽  
E J. Evans
Keyword(s):  
Heat Flow ◽  
Stable Phase ◽  
Carbon Preference Index ◽  
Preference Index ◽  
History Of ◽  
Thermal Histories ◽  
Gippsland Basin ◽  
Geochemical Method ◽  
Kinetics Of

The ester content in kerogen is depleted as sediment maturation progresses in a process which has been shown to correlate with change in the carbon preference index (CPI) of the associated soluble organic matter. We have carried out accurate laboratory measurements of the kinetics of the reaction which causes ester depletion in sediments, and we show how this information can be used to assess the thermal history of sediments. Two wells were selected, Grunter-1 and Volador-1, to provide samples from the Latrobe Group in the Gippsland Basin. The CPI values were measured to assess the extent of reaction at points down each well, and these values were then used with the kinetic parameters for the ester depletion process to obtain thermal histories which are consistent with the available maturity information.This treatment enabled the heat flow from 50 Ma to the present to be assessed and it suggests that at both locations a constant low heat flow during the Gippsland stable phase was followed by a gradual increase from the beginning of the Miocene to present-day values.

A NEW METHOD FOR ASSESSING THE THERMAL HISTORY OF SEDIMENTS: A CASE STUDY FROM THE EXMOUTH PLATEAU IN NORTHWESTERN AUSTRALIA.

1990 ◽  
Vol 30 (1) ◽  
pp. 364
Author(s):  
Robert Alexander ◽  
Roger Marzi ◽  
Robert I Kagi
Keyword(s):  
Heat Flow ◽  
Thermal History ◽  
Laboratory Studies ◽  
Molecular Processes ◽  
Sediment Column ◽  
Exmouth Plateau ◽  
History Of ◽  
Northwestern Australia ◽  
Geochemical Constraints

The Jupiter-l well on the Exmouth Plateau is presented as a case study to illustrate the use of a new molecular geochemical approach to assessing thermal history. This approach involves measuring the extent to which six independent molecular processes have occurred in a sediment column. The rates at which these molecular processes occur are well known from controlled laboratory studies; by measuring the extent to which each molecular process has occurred at a number of points in the sediment column, it is possible to identify a thermal history which is consistent with these geochemical constraints and the known geology of the sediment column. In the present study, this approach revealed that the heat flow which best accounts for present day temperatures and maturity involved a comparatively low heat flow of not more than 1.1 HFU until approximately 88 Ma before present, followed by an increase to 1.3 HFU which has continued until the present day.

scholarly journals Heating rate dependence of anatase to rutile transformation

2016 ◽  
Vol 10 (4) ◽  
pp. 235-241 ◽  
Author(s):  
Pietro Galizia ◽  
Giovanni Maizza ◽  
Carmen Galassi
Keyword(s):  
Heating Rate ◽  
Substantial Improvement ◽  
Stable Phase ◽  
Transformation Rate ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
History Of ◽  
Degussa P25 ◽  
Kinetic Transformation ◽  
Kinetics Of

Commercial titania powders were calcined in order to investigate the influence of the heating history on the thermally stable phase (rutile). Temperatures from 620 to 700?C and heating rates from 50 to 300?C/h were used in order to evaluate their influence on the kinetics of transformation and microstructure evolution. The quantitative analysis of anatase-rutile mixtures based on X-ray diffraction intensities was performed. The results were plotted as cumulative transformation rate vs. cumulative coarsening rate in order to address the heating history of the anatase to rutile transformation. As the main result it was found that the amount of anatase transformed into rutile increases with increasing heating rate at fixed soaking time and temperature of calcination. Through linear extrapolation of experimental data obtained from the calcined commercial titania Degussa P25, it was found that 83 nm for the rutile crystallite size is the lowest limit needed for getting 100% of rutile powders. A substantial improvement in the anatase to rutile kinetic transformation was achieved after pressing the starting powders in order to exploit the interface nucleation.

Press Propaganda and Subaltern Agents of Pan-Islamic Networks in the Muslim Mediterranean World prior to World War I

2018 ◽  
Author(s):  
Odile Moreau
Keyword(s):  
Middle East ◽  
World War I ◽  
North Africa ◽  
World War ◽  
Subaltern Studies ◽  
Resistance Movements ◽  
The Press ◽  
Mediterranean World ◽  
History Of

This chapter explores movement and circulation across the Mediterranean and seeks to contribute to a history of proto-nationalism in the Maghrib and the Middle East at a particular moment prior to World War I. The discussion is particularly concerned with the interface of two Mediterranean spaces: the Middle East (Egypt, Ottoman Empire) and North Africa (Morocco), where the latter is viewed as a case study where resistance movements sought external allies as a way of compensating for their internal weakness. Applying methods developed by Subaltern Studies, and linking macro-historical approaches, namely of a translocal movement in the Muslim Mediterranean, it explores how the Egypt-based society, al-Ittihad al-Maghribi, through its agent, Aref Taher, used the press as an instrument for political propaganda, promoting its Pan-Islamic programme and its goal of uniting North Africa.

Turning Aliens into Socialists

2010 ◽  
Vol 1 (1) ◽  
pp. 75-93
Author(s):  
Jessica Moberg
Keyword(s):  
Outer Space ◽  
The United States ◽  
Second World War ◽  
World War ◽  
History Of ◽  
Swedish History ◽  
Second World ◽  
The Universe ◽  
Highly Evolved

Immediately after the Second World War Sweden was struck by a wave of sightings of strange flying objects. In some cases these mass sightings resulted in panic, particularly after authorities failed to identify them. Decades later, these phenomena were interpreted by two members of the Swedish UFO movement, Erland Sandqvist and Gösta Rehn, as alien spaceships, or UFOs. Rehn argued that ‘[t]here is nothing so dramatic in the Swedish history of UFOs as this invasion of alien fly-things’ (Rehn 1969: 50). In this article the interpretation of such sightings proposed by these authors, namely that we are visited by extraterrestrials from outer space, is approached from the perspective of myth theory. According to this mythical theme, not only are we are not alone in the universe, but also the history of humankind has been shaped by encounters with more highly-evolved alien beings. In their modern day form, these kinds of ideas about aliens and UFOs originated in the United States. The reasoning of Sandqvist and Rehn exemplifies the localization process that took place as members of the Swedish UFO movement began to produce their own narratives about aliens and UFOs. The question I will address is: in what ways do these stories change in new contexts? Texts produced by the Swedish UFO movement are analyzed as a case study of this process.

A Case Study on the Process of Creating Interests in History of History-Deokhu

2019 ◽  
Vol 58 (1) ◽  
pp. 147-159
Author(s):  
Young-Seok Seo ◽  
Bong-Seok Kim
Keyword(s):  
History Of

Scales and Units

2018 ◽  
Author(s):  
Kathryn M. de Luna
Keyword(s):  
Language Change ◽  
Historical Linguistics ◽  
Bantu Languages ◽  
The North ◽  
First Case ◽  
Linguistic Evidence ◽  
River Region ◽  
History Of ◽  
Alternative Approaches

This chapter uses two case studies to explore how historians study language movement and change through comparative historical linguistics. The first case study stands as a short chapter in the larger history of the expansion of Bantu languages across eastern, central, and southern Africa. It focuses on the expansion of proto-Kafue, ca. 950–1250, from a linguistic homeland in the middle Kafue River region to lands beyond the Lukanga swamps to the north and the Zambezi River to the south. This expansion was made possible by a dramatic reconfiguration of ties of kinship. The second case study explores linguistic evidence for ridicule along the Lozi-Botatwe frontier in the mid- to late 19th century. Significantly, the units and scales of language movement and change in precolonial periods rendered visible through comparative historical linguistics bring to our attention alternative approaches to language change and movement in contemporary Africa.

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