scholarly journals Correction to: Facies, magnetic susceptibility and timing of the Late Devonian Frasnian/Famennian boundary interval (Xom Nha Formation, Central Vietnam)

2021 ◽  
Author(s):  
Hoa Phuong Ta ◽  
Peter Königshof ◽  
Brooks B. Ellwood ◽  
Thang C. Nguyen ◽  
Phuong Lan T. Luu ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Late Devonian ◽  
Central Vietnam

scholarly journals Facies, magnetic susceptibility and timing of the Late Devonian Frasnian/Famennian boundary interval (Xom Nha Formation, Central Vietnam)

2021 ◽  
Author(s):  
Hoa Phuong Ta ◽  
Peter Königshof ◽  
Brooks B. Ellwood ◽  
Thang C. Nguyen ◽  
Phuong Lan T. Luu ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Southeast Asia ◽  
Accumulation Rate ◽  
Sediment Accumulation ◽  
Black Shales ◽  
Upper Devonian ◽  
Late Devonian ◽  
Sedimentation Rates ◽  
Cosmopolitan Species ◽  
Central Vietnam

AbstractUpper Devonian carbonates deposited through the Frasnian/Famennian (F/F) stage boundary in the Xom Nha Formation, Central Vietnam, were studied. The section is mainly composed of fossiliferous, brecciated, and laminated limestone beds, while shale beds occur in a subordinate number. Microfacies generally suggests a hemipelagic setting on an outer shelf environment with low sedimentation rates. A sediment accumulation rate of 0.217 cm/kyrs for this section is calculated. The Xom Nha section does not exhibit characteristic black shales or black limestones through the F/F boundary, but instead shows a similar lithology in comparison to other F/F sections in Southeast Asia. The carbonates yielded abundant conodonts, which represent mainly cosmopolitan species but the section differs from most sections in Europe in showing relatively high numbers of Palmatolepis linguiformis species. Deposition through the F/F boundary interval reported here for the Xom Nha section appears to have occurred during a ~1.2 Ma, and shows well-defined climate cyclicity.

Anisotropy of magnetic susceptibility fabrics in syntectonic plutons as tectonic strain markers: the example of the Canso pluton, Meguma Terrane, Nova Scotia

2009 ◽  
Vol 100 (1-2) ◽  
pp. 147-158 ◽  
Author(s):  
Keith Benn
Keyword(s):  
Magnetic Susceptibility ◽  
Pure Shear ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Late Devonian ◽  
Tectonic Structures ◽  
Granite Pluton ◽  
Appalachian Orogen ◽  
Meguma Terrane ◽  
Tectonic Terranes ◽  
Textural Evidence

ABSTRACTThe anisotropy of magnetic susceptibility (AMS) is widely and routinely used to measure the preferred orientations of Fe-rich minerals in undeformed and weakly deformed granite plutons. The interpretation of the mapped AMS fabrics depends on rock-textural observations, on the map patterns of the fabrics in plutons, and on comparisons of the pluton fabrics to tectonic structures in the country rocks. The AMS may document emplacement-flow related fabrics, but the emplacement fabrics may be reworked or completely overprinted by rather weak tectonic strains of the magma mush or the cooling pluton, especially in syntectonic intrusions. The Late Devonian Canso granite pluton is an excellent example of overprinting of emplacement fabrics by weak tectonic strains. The Canso pluton was emplaced ca. 370 Ma along the boundary between the Meguma and Avalon tectonic terranes, in the northern Appalachian orogen. The AMS was mapped along two traverses that cross the pluton and that are perpendicular to the terrane boundary. Textural evidence suggests the rocks underwent very modest post-full crystallisation strains. The AMS records the dextral transcurrent shearing that occurred on the terrane boundary during emplacement and cooling of the Canso pluton, supporting interpretations that weakly deformed syntectonic granites can be used as indicators of regional bulk kinematics. AMS fabrics in Late Devonian granites of the Meguma Terrane suggest partitioning of the non-coaxial shearing into the terrane bounding fault, with pure-shear dominated deformation further from the fault. Numerical simulations suggest that the kinematics recorded by the fabrics in the Canso pluton was simple-shear, or transpression or transpression with small components of pure shear oriented perpendicular to the bounding shear zone.

THE LATE DEVONIAN (FRASNIAN) PUNCTATA EVENT IN THE GREAT BASIN, U.S.A.: A NEW HIGH-RESOLUTION δ13CCARB AND MAGNETIC SUSCEPTIBILITY RECORD

2018 ◽  
Author(s):  
Todd A. LaMaskin ◽  
◽  
Krysden A. Schantz ◽  
Olivia A. Koster ◽  
Amelia A. Perry ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
High Resolution ◽  
Great Basin ◽  
Late Devonian

MAGNETIC SUSCEPTIBILITY AND ANOMALOUS BEHAVIOUR OF KNIGHT SHIFT IN SmPt2 AND SmSn3

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1028-C1-1030 ◽  
Author(s):  
S. K. MALIK ◽  
R. VIJAYARAGHAVAN
Keyword(s):  
Magnetic Susceptibility ◽  
Knight Shift ◽  
Anomalous Behaviour

MAGNETIC SUSCEPTIBILITY AND ANISOTROPY OF THE ORGANIC SUPERCONDUCTOR (TMTSF)2ClO4

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-893-C3-901 ◽  
Author(s):  
M. Miljak ◽  
J. R. Cooper ◽  
K. Bechgaard
Keyword(s):  
Magnetic Susceptibility ◽  
Organic Superconductor
Sign in / Sign up

Export Citation Format

Share Document