Structural elements and deformational history of rocks in eastern Massachusetts

1976 ◽  
Vol 87 (10) ◽  
pp. 1377 ◽  
Author(s):  
ARTHUR E. NELSON
Keyword(s):  
Structural Elements ◽  
Deformational History ◽  
History Of ◽  
Eastern Massachusetts

Metasedimentary rocks, intrusions and deformation history in the south-east part of the c. 1800 Ma Ketilidian orogen, South Greenland: Project SUPRASYD 1996

1997 ◽  
pp. 60-65
Author(s):  
Adam A. Garde ◽  
Brian Chadwick ◽  
John Grocott ◽  
Cees Swager
Keyword(s):  
Field Work ◽  
Deformation History ◽  
The South ◽  
Present Contribution ◽  
East Part ◽  
Metasedimentary Rocks ◽  
Deformational History ◽  
Base Camp ◽  
History Of ◽  
Geological Map

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Garde, A. A., Chadwick, B., Grocott, J., & Swager, C. (1997). Metasedimentary rocks, intrusions and deformation history in the south-east part of the c. 1800 Ma Ketilidian orogen, South Greenland: Project SUPRASYD 1996. Geology of Greenland Survey Bulletin, 176, 60-65. https://doi.org/10.34194/ggub.v176.5063 _______________ The south-east part of the c. 1800 Ma Ketilidian orogen in South Greenland (Allaart, 1976) is dominated by strongly deformed and variably migmatised metasedimentary rocks known as the ‘Psammite and Pelite Zones’ (Chadwick & Garde, 1996); the sediments were mainly derived from the evolving Julianehåb batholith which dominates the central part of the orogen. The main purpose of the present contribution is to outline the deformational history of the Psammite Zone in the region between Lindenow Fjord and Kangerluluk (Fig. 2), investigated in 1994 and 1996 as part of the SUPRASYD project (Garde & Schønwandt, 1995 and references therein; Chadwick et al., in press). The Lindenow Fjord region has high alpine relief and extensive ice and glacier cover, and the fjords are regularly blocked by sea ice. Early studies of this part of the orogen were by boat reconnaissance (Andrews et al., 1971, 1973); extensive helicopter support in the summers of 1992 and 1994 made access to the inner fjord regions and nunataks possible for the first time.A preliminary geological map covering part of the area between Lindenow Fjord and Kangerluluk was published by Swager et al. (1995). Hamilton et al. (1996) have addressed the timing of sedimentation and deformation in the Psammite Zone by means of precise zircon U-Pb geochronology. However, major problems regarding the correlation of individual deformational events and their relationship with the evolution of the Julianehåb batholith were not resolved until the field work in 1996. The SUPRASYD field party in 1996 (Fig. 1) was based at the telestation of Prins Christian Sund some 50 km south of the working area (Fig. 2). In addition to base camp personnel, helicopter crew and the four authors, the party consisted of five geologists and M.Sc. students studying mafic igneous rocks and their mineralisation in selected areas (Stendal et al., 1997), and a geologist investigating rust zones and areas with known gold anomalies.

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.

Deformational History of the Eastern Belt, Peninsular Malaysia

2001 ◽  
Vol 4 (4) ◽  
pp. 556 ◽  
Author(s):  
Ibrahim Abdullah ◽  
Heru Sigit Purwanto
Keyword(s):  
Peninsular Malaysia ◽  
Deformational History ◽  
History Of

A PEDIATRIC-PSYCHIATRIC VIEWPOINT ON OBESITY

PEDIATRICS ◽  
1957 ◽  
Vol 20 (3) ◽  
pp. 552-556
Author(s):  
Reginald S. Lourie
Keyword(s):  
Point Of View ◽  
The Other ◽  
Structural Elements ◽  
Practical Point ◽  
The Third ◽  
History Of ◽  
Gastric Mucous ◽  
History Of Obesity ◽  
Excessive Quantity ◽  
Layer Concept

FROM the viewpoint of the pediatric psychiatrist, the problems of obesity, as seen clinically, can be thought of as having three layers. The first is constitutional, better described as physiologic, which may be broken down into genetic and structural elements. The second is psychologic, consisting of the values that food intake or the obesity itself come to have. The third layer is made of the cultural and social reactions to food and fat. These attitudes encountered inside and outside the home intermesh in their effects with the physiologic and psychologic levels. These, in turn, are also interwoven, until one cannot separate one layer from the other. However, when individual cases are scrutinized they reveal the pathology at one layer or the other to predominate and indicate where efforts to modify the abnormality might best be directed. Incidentally, the same levels operate on the other side of the coin, anorexia. From the practical point of view, let us consider the natural history of obesity and the clinical varieties one sees in practice, and let us see how the three-layer concept fits. First, as pointed out by Gordon, there is a tendency to be complacent or even pleased with obese infants. At level one, the physiologic, such constitutional factors as those present in the neonate born with an excessive quantity of pepsinogen secreted by the gastric mucous membrane could have the effect of producing as Mirsky points out, a relatively intense or even continuous hunger, and make greater demands on its mother for nursing.

scholarly journals Circulation in Insect Wings

2020 ◽  
Vol 60 (5) ◽  
pp. 1208-1220 ◽  
Author(s):  
Mary K Salcedo ◽  
John J Socha
Keyword(s):  
Flexible Structures ◽  
Wing Venation ◽  
Living Tissue ◽  
Structural Elements ◽  
Active Sensors ◽  
Wing Membrane ◽  
Insect Wings ◽  
Sensory Hairs ◽  
History Of ◽  
Membrane Wing

Synopsis Insect wings are living, flexible structures composed of tubular veins and thin wing membrane. Wing veins can contain hemolymph (insect blood), tracheae, and nerves. Continuous flow of hemolymph within insect wings ensures that sensory hairs, structural elements such as resilin, and other living tissue within the wings remain functional. While it is well known that hemolymph circulates through insect wings, the extent of wing circulation (e.g., whether flow is present in every vein, and whether it is confined to the veins alone) is not well understood, especially for wings with complex wing venation. Over the last 100 years, scientists have developed experimental methods including microscopy, fluorescence, and thermography to observe flow in the wings. Recognizing and evaluating the importance of hemolymph movement in insect wings is critical in evaluating how the wings function both as flight appendages, as active sensors, and as thermoregulatory organs. In this review, we discuss the history of circulation in wings, past and present experimental techniques for measuring hemolymph, and broad implications for the field of hemodynamics in insect wings.

scholarly journals What Does it Mean to be a Woman in Sports? An Analysis of the Jurisprudence of the Court of Arbitration for Sport

2020 ◽  
Vol 20 (3) ◽  
pp. 387-411
Author(s):  
Lena Holzer
Keyword(s):  
Human Rights ◽  
Sex And Gender ◽  
Structural Elements ◽  
Sports Law ◽  
Legal Studies ◽  
Caster Semenya ◽  
History Of ◽  
Scientific Dispute ◽  
And Gender ◽  
Definition Of

ABSTRACT This article explores the definition of ‘sportswoman’ as put forward in the Caster Semenya case (2019) and the Dutee Chand case (2015) before the Court of Arbitration for Sport (CAS). It analyses the structural and discursive factors that made it possible for the CAS to endorse a definition that reduces sex and gender to a matter concerning testosterone. By relying on the concept of intersectionality and analytical sensibilities from Critical Legal Studies, the article shows that framing the cases as a matter of scientific dispute, instead of as concerning human rights, significantly influenced the CAS decisions. Moreover, structural elements of international sports law, such as the lack of knowledge of human rights among CAS arbitrators and a history of institutionalising gendered and racialised body norms through sporting regulations, further aided the affirmation of the ‘testosterone rules’.

WESTERN OTWAY CRAYFISH GROUP TROUGHS

1995 ◽  
Vol 35 (1) ◽  
pp. 385 ◽  
Author(s):  
C. D. Cockshell ◽  
G. W. O'Brien ◽  
A. McGee ◽  
R. Lovibond ◽  
D. Perincek ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Seismic Events ◽  
Structural Elements ◽  
Standard Nomenclature ◽  
Drilling Data ◽  
History Of

Commercial volumes of hydrocarbons have been discovered in Early Cretaceous synrift sediments of the Crayfish Group of the Penola Trough, western Otway Basin. Four other such depocentres are recognised using available seismic and drilling data. A standard nomenclature is proposed for the major structural elements observed in this part of the Otway Basin.Various tectonic models proposed for the Early Cretaceous rift history of the Otway Basin are reviewed and tested using true dip analysis of seismic events and sandbox modelling experiments. Results support a generally north-south direction for rift extension in the Tithonian-Barremian. This implies that the ENE trending Robe Trough is the headwall rift compartment (although with 20°obliquity), whereas the NW trending Penola Trough is a more oblique or transtensional rift compartment.

Mappila Muslim Masculinities: A History of Contemporary Abjectification

2018 ◽  
Vol 23 (3-4) ◽  
pp. 542-557 ◽  
Author(s):  
Muhammadali P. Kasim
Keyword(s):  
Public Domain ◽  
Historical Background ◽  
Structural Elements ◽  
The South ◽  
South Indian ◽  
Multiple Dimensions ◽  
Indian State ◽  
History Of ◽  
British Colonial

This article explores multiple dimensions of stereotyping Mappila Muslim masculinities in the south Indian state of Kerala, as abject and demonized other. I begin with a survey of the British colonial construction of Mappila masculinity as, for example, militant religious fanatic, against the historical background of encounters between the two. It follows an examination of the new ways of reproducing these constructs in a changed yet hegemonic narrative public domain of the contemporary where Hindu majoritarian nationalism gathers its momentum. In so doing, this article also scrutinizes the larger mythological and structural elements of the contemporary refiguring. Drawing from these historical and contemporary trajectories, I argue that abjectification of Muslim masculinities is one of the basic ingredients of Islamophobia at work, often in banal forms.

Adaption of active boundary conditions in structural fire testing

2019 ◽  
Vol 10 (4) ◽  
pp. 504-528
Author(s):  
Ramla Karim Qureshi ◽  
Negar Elhami-Khorasani ◽  
Thomas Gernay
Keyword(s):  
Boundary Conditions ◽  
Structural Steel ◽  
Test Specimen ◽  
Fire Test ◽  
Structural Elements ◽  
Fire Testing ◽  
Content Type ◽  
Steel Columns ◽  
History Of ◽  
Force Displacement

Purpose This paper aims to investigate the need for active boundary conditions during fire testing of structural elements, review existing studies on hybrid fire testing (HFT), a technique that would ensure updating of boundary conditions during a fire test, and propose a compensation scheme to mitigate instabilities in the hybrid testing procedure. Design/methodology/approach The paper focuses on structural steel columns and starts with a detailed literature review of steel column fire tests in the past few decades with varying axial and rotational end restraints. The review is followed with new results from comparative numerical analyses of structural steel columns with various end constraints. HFT is then discussed as a potential solution to be adapted for fire testing of structural elements. Challenges in contemporary HFT procedures are discussed, and application of stiffness updating approaches is demonstrated. Findings The reviewed studies indicate that axial and rotational restraints at the boundaries considerably influence the fire response of steel columns. Equivalent static spring technique for simulating effect of surrounding frame on an isolated column behavior does not depict accurate buckling and post-buckling response. Additionally, numerical models that simulate fire performance of a column situated in a full-frame do follow the trends observed in actual test results up until failure occurs, but these simulations do not necessarily capture post-failure performance accurately. HFT can be used to capture proper boundary conditions during testing of isolated elements, as well as correct failure modes. However, existing studies showed cases with instabilities during HFT. This paper demonstrates that a different stiffness updates calculated from the force-displacement response history of test specimen at elevated temperature can be used to resolve stability issues. Originality/value The paper has two contributions: it suggests that the provision of active boundary conditions is needed in structural fire testing, as equivalent static spring does not necessarily capture the effect of surrounding frame on an isolated element during a fire test, and it shows that force-displacement response history of test specimen during HFT can be used in the form of a stiffness update to ensure test stability.

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