The history of Mars' dynamo as revealed by modeling magnetic anomalies near Tyrrhenus Mons and Syrtis Major

2012 ◽  
Vol 117 (E10) ◽  
Author(s):  
C. Milbury ◽  
G. Schubert ◽  
C. A. Raymond ◽  
S. E. Smrekar ◽  
B. Langlais
Keyword(s):  
Magnetic Anomalies ◽  
History Of ◽  
Syrtis Major

ROOM TEMPERATURE MAGNETIC ANOMALIES IN BENZENE TREATED Bi–Pb–Sr–Ca–Cu–O POWDER

1991 ◽  
Vol 05 (21) ◽  
pp. 1447-1456 ◽  
Author(s):  
A. R. HARUTUNYAN ◽  
L. S. GRIGORYAN ◽  
A. S. KUZANYAN ◽  
A. A. KUZNETSOV ◽  
A. A. TERENTIEV ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Chemical Composition ◽  
Room Temperature ◽  
Microprobe Analysis ◽  
Magnetic Anomalies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Two Samples ◽  
Field Dependent ◽  
History Of

Two samples of benzene-treated Bi–Pb–Sr–Ca–Cu–O powder exhibited at 300 K magnetic field dependent diamagnetism and magnetization irreversibility. The treatment with benzene resulted also in the appearance of microwave absorption at low magnetic fields, while is sensitive to magnetic history of the sample. From X-ray diffraction data one can see that upon benzene treatment the reflections of 85 K and 110 K phases do not change practically, but a series of new reflections appeared, indicating a lattice modulation with 4.9 nm periodicity. A microprobe analysis revealed substantial inhomogeneity of chemical composition across the samples. The room temperature anomalies were weakened in one sample and vanished in the second upon thermal cycling.

The geological history of Northeast Syrtis Major, Mars

Icarus ◽  
2017 ◽  
Vol 293 ◽  
pp. 66-93 ◽  
Author(s):  
Michael S. Bramble ◽  
John F. Mustard ◽  
Mark R. Salvatore
Keyword(s):  
Geological History ◽  
History Of ◽  
Syrtis Major

Experiences of Spiritual Visitation and Impregnation: Potential Induction by Frequency-Modulated Transients from an Adjacent Clock

2001 ◽  
Vol 92 (1) ◽  
pp. 35-36 ◽  
Author(s):  
M. A. Persinger ◽  
S. A. Koren
Keyword(s):  
Holy Spirit ◽  
Complex Form ◽  
Roman Catholic ◽  
Magnetic Anomalies ◽  
Brain Trauma ◽  
Female Adolescent ◽  
Left Shoulder ◽  
Left Handed ◽  
The Holy Spirit ◽  
History Of

A left-handed Roman Catholic female adolescent with a history of early brain trauma reported nightly visitations by a sentient being. During one episode she experienced vibrations of the bed, an external presence along the left side that moved into her body, inner vaginal (not clitoral) and uterine sensations, and the sense of being impregnated by a force she attributed to the Holy Spirit. After the latter experience she felt an invisible baby superimposed upon her left shoulder. Analyses of the measurements for magnetic anomalies within her bedroom indicated an electric clock about 20 cm from her head while she slept. The complex form of the 4 microT magnetic pulses generated by the clock was similar to shapes that evoke electrical seizures in epileptic rats and sensitive humans.

Structure du plateau continental armoricain

1975 ◽  
Vol 279 (1288) ◽  
pp. 109-121 ◽  
Keyword(s):  
Ground Level ◽  
Magnetic Anomalies ◽  
Magnetic Survey ◽  
Positive Anomaly ◽  
The South ◽  
The North ◽  
Basement Rocks ◽  
Average Accuracy ◽  
Magnetic Field Model ◽  
History Of

Between 1965 and 1970 there has been conducted, in collaboration with the hydrographic service of the French navy, a magnetic survey of the Armorican continental plateau. The zone, covered with 48000 km of profiles, stretches between the parallels of 46° 10' N and 49° 30' N and between the meridians 4° W and 7° 15' W. Position fixing was carried out by means of Toran, with an average accuracy of 50 m. Maps of the total field intensity, reduced to epoch 1967.5, and the magnetic anomalies have been drawn to the scale 1:250000. The magnetic anomalies have been calculated by means of a magnetic field model defined by Jensen and Cain. Two major zones of anomaly can be identified: a northern one, bounded to the south by the 48° N parallel, with strong relief, where the magnetic anomalies are numerous and include major ones at the entrance to the Channel; a southern zone, with considerably less relief, but where the anomalies present several major directions. Several of these anomalies have been interpreted by three different methods with the intention of determining the depth of the sources of disturbance and of specifying possible relationships between these sources and the structural geology of the Armorican plateau. From the south to the north of the region studied, the floor of the continental plateau appears to be divided into compartments by large SW-NE horst and graben structures of Hercynian age. In each compartment the depth to basement increases from east to west by step-faulting with a NW-SE orientation, such faulting has played a role throughout the geological history of the continental plateau. Finally, it emerges from this study that the magnetic anomalies are, for the most part, related to the major structural and tectonic lines of the metamorphic basement visible at ground level. Several areas of high positive anomaly may be associated with basic intrusions emplaced along the lines of major faults in the basement rocks of the Armorican platform.

Mobility of Morocco

1980 ◽  
Vol 17 (11) ◽  
pp. 1546-1558 ◽  
Author(s):  
Bertrand Sichler ◽  
Jean-Louis Olivet ◽  
Jean-Marie Auzende ◽  
Hélène Jonquet ◽  
Jean Bonnin ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Magnetic Anomalies ◽  
Resolving Power ◽  
Virtual Geomagnetic Pole ◽  
Geomagnetic Pole ◽  
History Of ◽  
The Times ◽  
Central Atlantic ◽  
Early Phases ◽  
Limited Motion

The mobility of Morocco relative to Africa during the early history of the Atlantic has long been debated: arguments have been developed from Atlantic kinematic considerations and from paleomagnetic results. Both types of arguments are reexamined here. Using a new model of the Atlantic Ocean evolution described elsewhere, it is shown that the reconstructions of the positions of Africa relative to North America before the Atlantic opening, and at the times of magnetic anomalies M22 and J, do not imply a major motion of Morocco independent of Africa during these periods of time. The corresponding geomagnetic paleopoles have been recomputed from sample sites located on both "mobile" Morocco and "stable" Africa. The results indicate that the virtual geomagnetic pole of "mobile" Morocco for the Liassic falls within the 95% confidence cone of "stable" Africa. It is thus concluded that no major movement has occurred between "mobile" Morocco and "stable" Africa during the early phases of opening of the central Atlantic Ocean. This is in accordance with the field geological observations on the South Atlas fault; however, limited motion along this lineament, as observed in the field, is still compatible with the above conclusion, owing to the limited resolving power of both kinematic and paleomagnetic methods.

2. Seafloor spreading and magnetic anomalies

2015 ◽  
pp. 17-35
Author(s):  
Peter Molnar
Keyword(s):  
Sea Level ◽  
Deep Sea ◽  
Magnetic Anomalies ◽  
Seafloor Spreading ◽  
Ocean Floor ◽  
Sea Level Changes ◽  
Ocean Ridges ◽  
The Pacific ◽  
History Of ◽  
The Difference

‘Seafloor spreading and magnetic anomalies’ begins with the Vine–Matthews Hypothesis, which proposed that strips of seafloor parallel to the mid-ocean ridges, where two plates diverge from one another, were magnetized in opposite directions because the Earth’s field had reversed itself many times. A test of the Vine–Matthews Hypothesis, which required determining the age of the seafloor, became a test of seafloor spreading. Dating the ocean floor using magnetic anomalies detected by magnetometers towed behind ships and core samples extracted during the Deep-Sea Drilling Project confirmed the hypothesis. With magnetic anomalies to date the seafloor and a curve relating seafloor depth and age, the difference between the Atlantic, with its ‘ridge’, and the Pacific and its ‘rise’ became comprehensible. With a theory for predicting the depths of oceans, it was also possible to understand the history of sea-level changes.

scholarly journals Spatial Trends in Mineral Abundances across Tyrrhena Terra on Mars derived from Geomorphological and Mineralogical Mapping

2021 ◽  
Author(s):  
Daniela Tirsch ◽  
Joana R. C. Voigt ◽  
Christina E. Viviano ◽  
Janice L. Bishop ◽  
Melissa D. Lane ◽  
...  
Keyword(s):  
Impact Craters ◽  
Erosion And Deposition ◽  
Study Region ◽  
Mineral Occurrence ◽  
Central Crater ◽  
Statistical Queries ◽  
Geomorphological Map ◽  
History Of ◽  
Occurrence Type ◽  
Syrtis Major

<p>Tyrrhena Terra hosts an intriguing variety of aqueously altered materials accompanied by unaltered mafic rocks. Our study region extends from the southern rim of the Isidis impact basin, including the Libya Montes region, southward to the Hellas Basin rim (Fig. 1). The NW part is dominated by lava flows from Syrtis Major that grade southwards into the TT highlands, dissected by fluvial channels and overprinted by abundant impact craters. These landforms together with lobate and fan-shaped deposits within impact craters are evidence for a variable history of erosion and deposition. Ancient phyllosilicate-rich materials have been exposed and uplifted from the subsurface, as they often occur in crater ejecta and central crater uplifts.</p><p>Our previous studies used CRISM spectral data together with CTX, HiRISE, and HRSC images as well as their derived topography data to create geomorphological maps of the southern Isidis region and Tyrrhena Terra. These datasets were used to map and characterize the types and occurrences of phyllosilicates, chlorite, opal, zeolites, carbonates, olivines, and pyroxenes and to assess the relationships between selected aqueous outcrops and surface features.</p><p>In this work, we build on these results by seeking correlations between aqueous mineral detections with our geomorphological map to assess 1) whether or not there are relationships between specific units and mineral occurrences, and 2) if there are trends across the study region in terms of mineral occurrence and abundance.</p><p>The mineralogical map originates from a study that spans not only the inter-Isidis-Hellas region, but also extends northwards to Nili Fosse and westwards to Terra Sabea. The focus of that study was on the metamorphic- and hydrothermally-related alteration history using CRISM targeted and mapping data, including hundreds of calibrated MTRDR images. These mineral detections were available to us as a mapped shape file, enabling us to assess the minerals in context with the geomorphological map. We utilized ESRI’s ArcGIS system and conducted multiple statistical queries in terms of mineral occurrence/type versus map unit in order to reveal possible trends within and across the study region.</p><p>Fe/Mg-phyllosilicates are the dominant aqueous mineral type within the study region and are more abundant in the central region compared to the proximity of either the Isidis or Hellas impact basin. Chlorites increase in abundance with distance from both impact basins, which could be an indication of hydrothermal processes from geothermal flux. The large Hellas impact event appears to have produced more varied temperatures and water chemistries, resulting in increased mineral variability near its rim.</p>

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