scholarly journals The West Andaman Fault: A complex strain-partitioning boundary at the seaward edge of the Aceh Basin, offshore Sumatra

Tectonics ◽  
2014 ◽  
Vol 33 (5) ◽  
pp. 786-806 ◽  
Author(s):  
Kylara M. Martin ◽  
Sean P. S. Gulick ◽  
James A. Austin ◽  
Kai Berglar ◽  
Dieter Franke ◽  
...  
Keyword(s):  
Strain Partitioning ◽  
The West ◽  
Seaward Edge ◽  
Complex Strain

scholarly journals Pre‐breakup Extension in the Northern North Sea Defined by Complex Strain Partitioning and Heterogeneous Extension Rates

Tectonics ◽  
2020 ◽  
Vol 39 (8) ◽  
Author(s):  
Johan S. Claringbould ◽  
Rebecca E. Bell ◽  
Christopher A.‐L. Jackson ◽  
Robert L. Gawthorpe ◽  
Tore Odinsen
Keyword(s):  
North Sea ◽  
Strain Partitioning ◽  
Complex Strain ◽  
Northern North Sea

scholarly journals Pre-breakup extension in the northern North Sea defined by complex strain partitioning and heterogeneous extension rates

2019 ◽  
Author(s):  
Johan Claringbould ◽  
Rebecca Bell ◽  
Christopher Jackson ◽  
Robert Gawthorpe ◽  
Tore Odinsen
Keyword(s):  
North Sea ◽  
Strain Partitioning ◽  
Complex Strain ◽  
Northern North Sea

scholarly journals An overview of strains in the Sevier thin-skinned thrust belt, Idaho and Wyoming, USA (latitude 42° N)

2022 ◽  
Author(s):  
John P. Craddock ◽  
David H. Malone
Keyword(s):  
Strain History ◽  
Thrust Belt ◽  
The West ◽  
Oblique Convergence ◽  
Calcite Veins ◽  
Thin Skin ◽  
Thrust Sheets ◽  
Complex Strain

ABSTRACT Calcite twinning analysis across the central, unbuttressed portion of the Sevier thin-skin thrust belt, using Cambrian–Cretaceous limestones (n = 121) and synorogenic calcite veins (n = 31), records a complex strain history for the Sevier belt, Idaho and Wyoming, USA. Plots of fabric types (layer-parallel shortening, layer-normal shortening, etc.), shortening and extension axes for the Paris thrust (west, oldest, n = 11), Meade thrust (n = 46), Crawford thrust (n = 15), Absaroka thrust (n = 55), Darby thrust (n = 13), Lander Peak klippe (n = 5), eastern Prospect thrust (n = 6), and distal Cretaceous foreland (n = 3) reveal a W-E layer-parallel shortening strain only in the Prospect thrust and distal foreland. Calcite twinning strains in all western, internal thrust sheets are complex mixes of layer-parallel (LPS), layer-normal (LNS), and non-plane strains in limestones and synorogenic calcite veins. This complex strain fabric is best interpreted as the result of oblique convergence to the west and repeated eastward overthrusting by the Paris thrust.

scholarly journals Syncontractional deposition of the Cretaceous Newark Canyon Formation, Diamond Mountains, Nevada: Implications for strain partitioning within the U.S. Cordillera

Geosphere ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 546-566 ◽  
Author(s):  
Russell V. Di Fiori ◽  
Sean P. Long ◽  
Anne C. Fetrow ◽  
Kathryn E. Snell ◽  
Joshua W. Bonde ◽  
...  
Keyword(s):  
Middle Part ◽  
Zircon Geochronology ◽  
Thrust Belt ◽  
Strain Partitioning ◽  
The West ◽  
Upper Paleozoic ◽  
Fault Propagation Fold ◽  
Mountain Belts ◽  
The U.S ◽  
Cretaceous Deposits

Abstract The timing of deformation and deposition within syntectonic basins provides critical information for understanding the evolution of strain in mountain belts. In the U.S. Cordillera, contractional deformation was partitioned between the Sevier thrust belt in Utah and several structural provinces in the hinterland in Nevada. One hinterland province, the Central Nevada thrust belt (CNTB), accommodated up to ∼15 km of shortening; however, in most places, this deformation can only be bracketed between Permian and Eocene. Cretaceous deposits of the Newark Canyon Formation (NCF), which are sparsely exposed along the length of the CNTB, offer the opportunity to constrain deformation timing. Here, we present mapping and U-Pb zircon geochronology from the NCF in the Diamond Mountains, which demonstrate deposition of the NCF during proximal CNTB deformation. Deposition of the basal NCF member was under way no earlier than ca. 114 Ma, a tuff in the middle part of the section was deposited at ca. 103 Ma, and the youngest member was deposited no earlier than ca. 99 Ma. Intraformational angular unconformities and abrupt along- and across-strike thickness changes indicate that NCF deposition was related to growth of an east-vergent fault-propagation fold. Clast compositions define unroofing of upper Paleozoic sedimentary rocks, which we interpret as the progressive erosion of an anticline ∼10 km to the west. CNTB deformation was contemporaneous with shortening in the Sevier thrust belt, which defines middle Cretaceous strain partitioning between frontal and interior components of the Cordillera. Strain partitioning may have been promoted by renewed underthrusting during a period of high-flux magmatism.

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

The fight to save Uganda’s White Rhino

1964 ◽  
Vol 2 (01) ◽  
pp. 6-12
Keyword(s):  
The West ◽  
West Nile ◽  
White Rhino

In the West Nile District of Uganda lives a population of white rhino—those relies of a past age, cumbrous, gentle creatures despite their huge bulk—which estimates only 10 years ago, put at 500. But poachers live in the area, too, and official counts showed that white rhino were being reduced alarmingly. By 1959, they were believed to be diminished to 300.

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