scholarly journals Pyropes and chromites of the Snap Lake/King Lake kimberlite dyke system in relation to the problem of the southern Slave craton lithospheric mantle structure and composition

2019 ◽  
Keyword(s):  
Lithospheric Mantle ◽  
Mantle Structure ◽  
Slave Craton

scholarly journals Lithospheric mantle structure beneath the Trans-Hudson Orogen and the origin of diamondiferous kimberlites

1998 ◽  
Vol 103 (B5) ◽  
pp. 10103-10114 ◽  
Author(s):  
Carl-Georg Bank ◽  
Michael G. Bostock ◽  
Robert M. Ellis ◽  
Zoltan Hajnal ◽  
John C. VanDecar
Keyword(s):  
Lithospheric Mantle ◽  
Mantle Structure

Electromagnetic images of the Trans-Hudson orogen: the North American Central Plains anomaly revealed

2005 ◽  
Vol 42 (4) ◽  
pp. 457-478 ◽  
Author(s):  
Alan G Jones ◽  
Juanjo Ledo ◽  
Ian J Ferguson
Keyword(s):  
Electrical Properties ◽  
North American ◽  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Three Dimensional ◽  
Conductivity Anomaly ◽  
Central Plains ◽  
Slave Craton ◽  
The North ◽  
Kimberlite Field

Magnetotelluric studies of the Trans-Hudson orogen over the last two decades, prompted by the discovery of a significant conductivity anomaly beneath the North American Central Plains (NACP), from over 300 sites yield an extensive database for interrogation and enable three-dimensional information to be obtained about the geometry of the orogen from southern North Dakota to northern Saskatchewan. The NACP anomaly is remarkable in its continuity along strike, testimony to along-strike similarity of orogenic processes. Where bedrock is exposed, the anomaly can be associated with sulphides that were metamorphosed during subduction and compression and penetratively emplaced deep within the crust of the internides of the orogen to the boundary of the Hearne margin. A new result from this compilation is the discovery of an anomaly within the upper mantle beginning at depths of ~80–100 km. This lithospheric mantle conductor has electrical properties similar to those for the central Slave craton mantle conductor, which lies directly beneath the major diamond-producing Lac de Gras kimberlite field. While the Saskatchewan mantle conductor does not directly underlie the Fort à la Corne kimberlite, which is associated with the Sask craton, the spatial correspondence is close.

scholarly journals Broadband Seismic Deployments for Imaging the Upper Mantle Structure in the Lützow-Holm Bay Region, East Antarctica

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Masaki Kanao ◽  
Yusuke Usui ◽  
Tomofumi Inoue ◽  
Akira Yamada
Keyword(s):  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Receiver Function ◽  
Tectonic Stress ◽  
Receiver Functions ◽  
East Antarctica ◽  
Mantle Structure ◽  
Passive Seismic ◽  
Regional Tectonic ◽  
Break Up

Broadband seismic deployments have been carried out in the Lützow-Holm Bay region (LHB), Dronning Maud Land, East Antarctica. The recorded teleseismic and local events are of sufficient quality to image the structure and dynamics of the crust and mantle of the terrain. Passive seismic studies by receiver functions and shear wave splitting suggest a heterogeneous upper mantle. Depth variations in topography for upper mantle discontinuities were derived from long period receiver function, indicating a shallow depth discontinuity at 660 km beneath the continental area of LHB. These results provide evidence of paleo upwelling of the mantle plume associated with Gondwana break-up. SKS splitting analysis anticipated a relationship between “fossil” anisotropy in lithospheric mantle and past tectonics. Moreover, active source surveys (DSSs) imaged lithospheric mantle reflections involving regional tectonic stress during Pan-African and succeeding extension regime at the break-up. By combining the active and passive source studies of the mantle structure, we propose an evolution model of LHB for constructing the present mantle structure.

Lithospheric mantle structure of the Siberian craton inferred from the superlong Meteorite and Rift seismic profiles

2014 ◽  
Vol 55 (7) ◽  
pp. 892-906 ◽  
Author(s):  
O.L. Kuskov ◽  
V.A. Kronrod ◽  
A.A. Prokof’ev ◽  
N.I. Pavlenkova
Keyword(s):  
Siberian Craton ◽  
Lithospheric Mantle ◽  
Mantle Structure ◽  
Seismic Profiles

scholarly journals PRELIMINARY LONG-PERIOD MAGNETOTELLURIC INVESTIGATION AT THE EDGE OF ICE SHEET IN EAST ANTARCTICA

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 875-880
Author(s):  
J. Guo ◽  
K. Wang ◽  
Z. Zeng ◽  
L. Li ◽  
J. Liu ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Three Dimensional ◽  
Thermal Activity ◽  
Mantle Structure ◽  
Frequency Range ◽  
Plate Movement ◽  
Long Period ◽  
Antarctic Continent ◽  
The Antarctic ◽  
Eastern Edge

Abstract. The lithospheric mantle structure of the Antarctic continent is of great significance of studying the polymerization and fragmentation mechanism of Gondwana and the plate movement law. Long-period magnetotelluric (LMT) is an important method to study the electrical structure of earth crust and mantle. However, been limited by the bad natural environment and logistics supply difficulties, there is no LMT record of Antarctica before. In 2018, China's 34th Antarctic scientific expedition carried out the LMT survey at the eastern edge of the Antarctic continent with a frequency range of 0.00015 Hz to 0.1 Hz. After the processing and analysis, we get three points as fellow: (1) The lithospheric mantle of Antarctica has a three-dimensional resistivity structure; (2) There are low resistivity regions in the Antarctic mantle, which may be related to thermal activity. (3) It is possible to carry out LMT measurements in eastern Antarctic and more can be done in the future.

scholarly journals New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion

2007 ◽  
Vol 34 (10) ◽  
Author(s):  
Chin-Wu Chen ◽  
Stéphane Rondenay ◽  
Dayanthie S. Weeraratne ◽  
David B. Snyder
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Mantle Structure ◽  
Slave Craton ◽  
Wave Inversion ◽  
Upper Mantle Structure
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