transparent gif


Ej inloggad.

Göteborgs universitets publikationer

A-tents in the Central Sierra Nevada, California: A geomorphological indicator of tectonic stress

Författare och institution:
Kerstin Ericson (Institutionen för geovetenskaper); Mats Olvmo (Institutionen för geovetenskaper)
Publicerad i:
Physical Geography, 25 ( 4 ) s. 291-312
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
A-tents and blisters are minor landforms associated with the release of compressive stress in combination with erosional off-loading in hard crystalline bedrock. The uplifted and westward tilted granitic batholith of the Sierra Nevada, California, comprises hundreds of Cretaceous intrusions, where sheeted bornhardts stand juxtaposed, and have been exposed to compressional stress during several time periods. Field mapping north of Yosemite Valley identified 79 A-tents with a preferred orientation ENE-WSW suggesting the application of directionally applied stress. A-tent, joint and bornhardt orientation imply NE-SW tension and NW-SE compression. The stress has probably been released after the rapid Tertiary uplift and erosional unloading in the late Quaternary. We suggest that the A-tents in this part of the Sierra Nevada are related to intrinsic compressional stress imposed on the bedrock during emplacement but before mid-Cretaceous transpression.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
a-tent, bornhardts, compressional stress, granite landforms, sierra nevada, yosemite-national-park, joint formation, rock, topography, fractures, evolution, australia, batholith, valley, uplift
Postens nummer:
Posten skapad:
2007-10-11 13:48

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007