thumbnail

The Salma Caldera complex, northeastern Arabian Shield, Kingdom of Saudi Arabia

Open-File Report 85-370
By:
https://doi.org/10.3133/ofr85370

Metrics

1
Crossref references
Web analytics dashboard Metrics definitions

Links

Abstract

The upper Proterozoic Salma caldera is genetically part of an elongate alkali granitic massif, Jabal Salma. Comenditic ash-flow tuffs, the oldest recognized rocks of the caldera complex, were erupted during caldera collapse associated with the rapid evacuation of the upper, mildly peralkaline part of a zoned magma reservoir. Within the tuff sequence, a massive, lithic-rich intracaldera tuff containing megabreccia blocks is overlain by a layered ash-flow sequence. Later peralkaline granite intruded the caldera ring fracture zone. Metaluminous to peraluminous magma rose beneath the caldera approximately 580 Ma ago and solidified as biotite alkali-feldspar granite, syenogranite, and granophyre. No apparent structural doming of the exposed volcanic rocks along the east side of the caldera took place, and post- emplacement deformation and metamorphism of the caldera are minimal.

Suggested Citation

Kellogg, K., 1985, The Salma Caldera complex, northeastern Arabian Shield, Kingdom of Saudi Arabia: U.S. Geological Survey Open-File Report 85-370, i, 23 p. :ill., maps ;28 cm., https://doi.org/10.3133/ofr85370.

ISSN: 2331-1258 (online)

ISSN: 0196-1497 (print)

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title The Salma Caldera complex, northeastern Arabian Shield, Kingdom of Saudi Arabia
Series title Open-File Report
Series number 85-370
DOI 10.3133/ofr85370
Year Published 1985
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description i, 23 p. :ill., maps ;28 cm.
Country Saudi Arabia
Online Only (Y/N) N
Additional Online Files (Y/N) N
Additional publication details