HYDROCARBON-RELATED DIAGENETIC ZONES (HRDZs) IN THE VULCAN SUB-BASIN, TIMOR SEA: RECOGNITION AND EXPLORATION IMPLICATIONS

1995 ◽  
Vol 35 (1) ◽  
pp. 220 ◽  
Author(s):  
G.W. O'Brien ◽  
E.P. Woods
Keyword(s):  
Late Miocene ◽  
Predictive Tool ◽  
Hydrocarbon Migration ◽  
Areal Distribution ◽  
Carbon Isotopic ◽  
Individual Structure ◽  
History Of ◽  
Timor Sea ◽  
Two Stages ◽  
Migration Pathways

Within very localised areas of the Vulcan Subbasin, the Eocene Grebe Formation sandstones are strongly cemented with carbonate. These cemented sands are recognisable on seismic data as zones of anomalously high velocity, and result in both time 'pull-up' and deterioration of the stack response in the underlying section.To determine the nature and origin of these cemented zones, their isotopic, mineralogical and petrologic compositions have been characterised, their seismic response and areal distribution established, and these observations integrated with ~2,730 km of AGSO water column geochemical ('sniffer-type') data.The carbon isotopic compositions of the carbonate within the cemented Grebe sands are diagnostic of carbonates formed principally via the oxidation of migrating, thermogenic hydrocarbons. Oxidation of the hydrocarbons took place in two stages: an earlier phase led to calcite precipitation, whereas a later phase produced (generally subsidiary) ferroan dolomite/ankerite cementation.Areas of known, present-day hydrocarbon seepage from the seafloor, such as over major faults on the Skua Horst and along the Vulcan Sub-basin/ Londonderry High boundary zone, are invariably associated with zones of highly cemented Eocene sands. Similarly, areas of known Tertiary hydrocarbon seepage, such as those associated with the residual oil columns on the Eider Horst, also contain strongly cemented Eocene sandstones.These observations have established a causal relationship between the presence of these Hydrocarbon-Related Diagenetic Zones (or HRDZs) in the Eocene sandstones and Tertiary-Quaternary hydrocarbon seepage. It is likely that most of the cementation occurred during the Late Miocene/Early Pliocene, when the Grebe Formation sands were at a shallow depth of burial(Recognition of this causal association has allowed several insights to be gained into the exploration potential and reactivation history of structures within the Vulcan Sub-basin. Mapping of the areal distribution of the cemented zones can effectively define hydrocarbon migration pathways. More importantly, however, predictable relationships exist between the seismic expression of the HRDZs, the total amount of hydrocarbons that have leaked from the traps, and the obliquity between the Jurassic and Late Miocene fault trends over the respective structures. A continuum exists between highintegrity accumulations, in which the fault trends are parallel and the HRDZs are small or absent, and breached accumulations, in which a significant obliquity exists between the respective fault trends and the HRDZs are large and seismically-intense.These observations provide a potential predictive tool for evaluating undrilled structures. It may be possible to determine, from the integration of seismic structural mapping and the characterisation of the seismic expression of the HRDZs, not only whether an individual structure is ever likely to have had a hydrocarbon column, but whether that column is likely to be preserved.

BASEMENT CONTROL ON THE DEVELOPMENT OF EXTENSIONAL SYSTEMS IN AUSTRALIA'S TIMOR SEA: AN EXAMPLE OF HYBRID HARD LINKED/SOFT LINKED FAULTING?

1996 ◽  
Vol 36 (1) ◽  
pp. 161 ◽  
Author(s):  
G.W. O'Brien ◽  
R. Higgins ◽  
P. Symonds ◽  
P. Quaife ◽  
J. Colwell ◽  
...  
Keyword(s):  
Seismic Data ◽  
Source Rocks ◽  
Aeromagnetic Data ◽  
Predictive Tool ◽  
Fault Type ◽  
Fracture Systems ◽  
Transport Direction ◽  
First Pass ◽  
Timor Sea ◽  
Migration Pathways

A series of rift models has been developed for basin systems in Australia's Timor Sea, via the interpretation of newly acquired deep crustal seismic and high resolution aeromagnetic data. These models, which incorporate observations on rift architecture, fault geometries, fault orientation, basement grain and composition, extensional transport direction and reactivation history, have then been iteratively tested by sophisticated analogue modelling experiments. This work has led to the development of a hybrid hard linked/soft linked (basement-involved/basement-detached) fault model. In this model, basement grain is the principal control on the rift architecture that develops, with pre-existing fracture systems acting to establish discrete offsets (hard linkages) between adjacent extensional faults. It is these basement features that produce the recti-linear features which are so common in aeromagnetic data around the Australian margin. With progressively greater extension, the basement-involved, hard linked system exerts no through-going (transfer fault-type) influence over the faulting within the overlying syn-rift phase, with the linkages between the syn-rift faults being 'soft' (via relay ramps, etc). However, as the hard links do act to relay the extensional faults or to flip their polarity (thereby typically producing cross-basinal highs), hard links strongly segment the extensional system into compartments of similar extensional style, and do control the relative positions of source rocks, fluid migration pathways and reservoirs within the rift. During basin reactivation (particularly inversion), the location and geometry of the underpinning, hard linked basement features closely control the locations of the traps that develop in the syn-and post-rift section, and the late-stage fluid flow history. When combined with aeromagnetic data, which define the location of the under-pinning, recti-linear, hard linked basement features, and some regional seismic data, these observations provide a first-pass predictive tool for determining where source depocentres, reservoirs and major structures are likely to be developed in a frontier basin, or where more subtle structural and/or stratigraphic traps might be found in a mature province.

Plastic deformations in kyanites by tectonometamorphic processes: a single-crystal X-ray diffraction study

2009 ◽  
Vol 73 (3) ◽  
pp. 359-371 ◽  
Author(s):  
G. D. Gatta ◽  
N. Rotiroti ◽  
M. Zucali
Keyword(s):  
Single Crystal ◽  
X Ray Diffraction ◽  
Plastic Deformations ◽  
X Ray ◽  
Deformational History ◽  
Significant Difference ◽  
Elliptical Section ◽  
History Of ◽  
Diffraction Patterns ◽  
Two Stages

AbstractThe crystalch emistry and crystal structure of naturalky anite crystals from the Eclogitic Micaschists Complex of the Sesia-Lanzo Zone, Western Italian Alps, have been investigated by means of optical microscopy, wavelength dispersive X-ray microanalysis, and single-crystal X-ray diffraction. The association of kyanite + garnet + phengitic-mica + chloritoid suggests that the eclogite-facies stages occurred at P ≤ 2.1 GPa and T ≤ 650ºC. Kyanite grains are large (cm-sized) porphyroblasts grown dynamically during one of the deformational events related to the subduction of the Austroalpine continentalcr ust. Under the polarizing microscope, kyanite grains show almost homogeneous cores, whereas rims are sometimes symplectitic aggregates of quartz and kyanite, confirming at least two stages of growth most likely related to the multistage deformational history of these rocks. Chemical analysis shows that Fe3+ is the major substituting cation for Al3+, ranging between 0.038 and 0.067 a.p.f.u.The single-crystal X-ray diffraction investigation of the kyanites shows severely textured patterns on the (h0l)*-plane. Such evidence is not observed in the unwarped diffraction patterns on (0kl)* and (hk0)*. The most significant difference between the structuralp arameters refined in this study, with respect to those of previously published unstrained gem-quality crystals, concerns the displacement parameters. The anisotropic displacement ellipsoids of all the atomic sites are significantly larger than those previously described, and systematically oriented with the largest elliptical section almost perpendicular to [010]. The larger ellipsoids in the kyanite crystal investigated here reflect the displacement of the centre of gravity of the electron distribution, rather than an anomalous atomic thermal motion. The magnitude and orientation of the displacement parameters and the textured/strained diffraction pattern may be the result of two combined effects: (1) that the kyanite crystals are actually composed of several blocks; (2) the crystals are affected by a pervasive residual strain, as a result of tectonometamorphic plastic deformations and re-crystallization.

Mesoamerica

2020 ◽  
pp. 407-427
Author(s):  
Christian DiCanio ◽  
Ryan Bennett
Keyword(s):  
Case Studies ◽  
Complex Tone ◽  
Prosodic Structure ◽  
Metrical Structure ◽  
Linguistic Typology ◽  
Areal Distribution ◽  
History Of ◽  
Mesoamerican Languages

The Mesoamerican linguistic area is rich with prosodic phenomena, including a wide variety of complex tone, phonation, stress, and intonational systems. The diversity of prosodic patterns in Mesoamerica reflects the extreme time-depth and complex history of the languages spoken there. This chapter surveys the prosody of Mesoamerican languages and some past analyses of their structures. Topics include the areal distribution of tonal complexity; interactions between stress, tone, and segmental contrasts; the phonetics of tone and phonation; metrical structure; and higher-level prosodic phenomena. Case studies from different languages also highlight interactions between morphological and word-prosodic structure. These topics underscore the importance of research on Mesoamerican languages to both phonological theory and linguistic typology.

scholarly journals HISTORY OF DEVELOPING THE CONCEPT OF «LARGE SOCIAL GROUPS». PART 1: PERIOD FROM THE MID-19th CENTURY TO THE MID-1930-Х YEARS OF SOCIAL PSYCHOLOGY DEVELOPMENT

2020 ◽  
pp. 390-418
Author(s):  
Ю.В. Ковалева
Keyword(s):  
Social Psychology ◽  
Social Life ◽  
Social Groups ◽  
Social Situation ◽  
Social Phenomena ◽  
Psychological Study ◽  
The Social ◽  
History Of ◽  
The One ◽  
Two Stages

Представлен историографический анализ развития понятия большие социальные группы и историко-психологический анализ социальных феноменов , связанных с массовыми общественными явлениями в России. Сформулированы актуальные проблемы психологии больших социальных групп, к которым относятся неоднородность оснований для их выделения, недостаточная дифференцированность со сходными понятиями, неравномерность исследований в различные временные периоды и идеологическая нагруженность их разработки. Данная работа была ответом на необходимость восполнения знаний о процессах в таких группах, происходивших в различные исторические периоды развития социальной психологии, с соответствующим им уровнем научного осмысления, а также обобщением этой целостной картины на уровне современного понимания и формулировка перспективных направлений исследований. Целью исследования является установление связи между определением и основными свойствами понятия «большие социальные группы» (его синонимов, аналогов) и особенностями социальной ситуации в определенный период времени, а также реконструкция социальных процессов данного исторического этапа. Проверялась гипотеза о том, что большие социальные группы как феномены социальной жизни формировались в соответствии с историческим временем, а соответствующее им понятие и его свойства с одной стороны отвечали уровню развития гуманитарного знания, а с другой - пытались удовлетворить общественный и политический запрос в объяснении и управлении социальной ситуацией. Использовались методы историографии социальной психологии и психолого-исторической реконструкции . Первая часть статьи посвящена анализу первых двух этапов развития социальной психологии - с середины XIX до начала XX вв. и в 1920-е гг. XX в. The historiographic analysis of the development of the concept of large social groups and historical and psychological study of social phenomena associated with mass social phenomena was presented. Topical problems of the psychology of large social groups are formulated, including heterogeneity of the grounds for their isolation, insufficient differentiation with similar concepts, uneven research in various periods, and ideological loading of the history of its development. The study's main problem was the need to replenish the processes in such groups that took place in various historical periods of social psychology development as well as a synthesis of this holistic picture at the level of modern understanding and the formulation of promising areas of research. The study's purpose was to establish a connection between the definition and the basic properties of the concept of "large social groups" (and its synonyms, analogs) and the peculiarities of the social situation in a certain period, as well as the reconstruction of social processes of this historical segment. The hypothesis was tested that large social groups as phenomena of social life were formed under the past time. The concept and its properties were corresponding to them, on the one hand, compared to the level of development of humanitarian knowledge. On the other, they tried to satisfy the social and political requests to understand and manage the social situation. Methods of the historiography of the history of social psychology and psychological and historical reconstruction were used. The article's first part was devoted to the analysis of the early two stages of the development of social psychology - from the middle of the XIX to the beginning of the XX centuries and 1920 of the XX century.

scholarly journals Erichthonius or Theseus, who established the Panathenaea?

2021 ◽  
Vol 13 (3) ◽  
pp. 259-268
Author(s):  
Tatiana Borisovna Gvozdeva
Keyword(s):  
Olympic Games ◽  
Urban Community ◽  
Vase Painting ◽  
New Name ◽  
New Information ◽  
History Of ◽  
Two Stages ◽  
Regional Character ◽  
The Olympic Games

The sources know two versions of the establishing of Panathenaia, the main public holiday of the Athenian polis. The earliest version of aition of Panathenaia is associated with the history of the Athenian indigenous king Erichthonius. The son of Gaia and Hephaestus, Erichthonius was raised by the goddess Athena on the Acropolis, and after becoming king of Athens, he dedicated the feast of Panathenaia to the goddess. In the source, he is the first founder of the holiday. However, two types of Panathenaia were known in Athens: the Lesser Panathenaia, which were held annually, and the Greater Panathenaia, which, like the Olympic Games, were held every four years. Gradually, there appear pieces of new information about the history of the establishing of the Panathenaia in the mythological tradition. Now the authors distinguish two stages in the history of the feast, wherein the earlier one was called Athenaia. Gradually Erichthonius was relegated to the background, as founder Athenaeus, whereas the holiday got a new name - Panathenaia. This process was often associated with the synoekismus of Theseus, when he had united all the Athenians into one urban community. The cult of Theseus became especially popular in Athens after the reforms of Cleisthenes. Theseus' exploits are becoming a popular theme in Attic vase painting, especially scenes depicting the struggle, which Theseus was believed to be the founder of in Athens. At the same time, the program of the Panathenaic Games was expanding, the Panathenaia gradually acquired a supra-regional character.

scholarly journals Comprehensive Rehabilitation After Reconstruction of the Anterior Cruciate Ligament

2021 ◽  
Vol 11 (8) ◽  
pp. 182-193
Author(s):  
Dawid Besztak ◽  
Karina Szczypiór-Piasecka ◽  
Alicja Mińko ◽  
Krzysztof Antczak
Keyword(s):  
Anterior Cruciate Ligament ◽  
Knee Joint ◽  
Cruciate Ligament ◽  
Treatment Options ◽  
Rehabilitation Process ◽  
History Of ◽  
Comprehensive Rehabilitation ◽  
Anterior Cruciate ◽  
Two Stages ◽  
Hospital Rehabilitation

Introduction: The knee joint is the second most frequently injured joint. Anterior cruciate ligament (ACL) injury is a relatively common injury to the inner part of the knee joint, mainly related to contact sports. Its rupture leads to instability of the entire joint. Two treatment options are possible: operative or conservative. Each of them is related to an appropriate rehabilitation process. The aim of this study was to define a comprehensive rehabilitation plan in patients after ACL rupture and meniscal suturing.Materials and methods: The work was written based on the medical history of the patient who was diagnosed with complete rupture of ACL, and then reconstruction was performed with the harvesting of a semitendinous and slender muscle graft.Results: The rehabilitation process can be divided into two stages: hospital and post-hospital. Rehabilitation in hospital conditions begins on the zero day after arthroscopy. The main goals of rehabilitation include: increasing the range of mobility, no myofascial dysfunctions, no thromboembolic complications, and the ability to self-service.Conclusion: Rehabilitation is an indispensable element of the treatment of patients after ACL reconstruction. Early initiation of rehabilitation brings tangible benefits during treatment and return to full physical fitness.

Ancient Meteorite Finds and the Earth's Surface Environment

2000 ◽  
Vol 53 (2) ◽  
pp. 131-142 ◽  
Author(s):  
Philip A. Bland ◽  
Alex W. R. Bevan ◽  
A. J. Tim Jull
Keyword(s):  
Age Distribution ◽  
Cosmogenic Radionuclides ◽  
Cold Desert ◽  
Frequency Distributions ◽  
Carbon Isotopic ◽  
The Earth ◽  
History Of ◽  
Tropical Areas ◽  
Surface Environment ◽  
Terrestrial Age

AbstractThe flux of meteorites to the Earth over the last 50,000 yr has remained approximately constant. Most meteorites that fall in temperate or tropical areas are destroyed on a time scale which is short compared to the rate of infall; however, in arid regions (both “hot” deserts and the “cold” desert of Antarctica) weathering is slower and accumulations of meteorites may occur. The initial composition for many meteorite groups is well known from modern falls, and terrestrial ages may be established from analyses of the abundance of cosmogenic radionuclides, providing an absolute chronology for recording terrestrial processes. As samples are falling constantly, and are distributed approximately evenly over the Earth, meteorites may thus be thought of as an appropriate “standard sample” for studying aspects of the terrestrial surface environment. Studies involving 14C and 36Cl terrestrial ages of meteorites, 57Fe Mössbauer spectroscopy (to quantify the degree of oxidation in samples), stable isotopes, and determination of halogen abundances are yielding information on the terrestrial history of meteorites: (i) terrestrial age and oxidation-frequency distributions for populations of samples allow the ages of surfaces to be estimated; (ii) differences in the weathering rate of samples between sites allows constraints to be imposed on the effect of climate on rock weathering rates; (iii) carbon isotopic compositions of generations of carbonate growth within meteorites allows, in some cases, temperatures of formation of carbonates to be estimated; (iv) structure in the oxidation–terrestrial age distribution for meteorites from some arid accumulation sites (specifically, the Nullarbor of Australia) appears to be linked to previous humid/arid cycles; (v) meteorite accumulations in Antarctica have been used to constrain aspects of the Quaternary evolution of the ice sheet, and terrestrial age and oxidation data have been used to constrain ice flow.

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