- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa (1)
-
East African Rift (1)
-
-
Asia
-
Arabian Peninsula
-
Arabian Shield (1)
-
Oman
-
Oman Mountains (1)
-
-
Saudi Arabia (1)
-
-
-
Europe
-
Western Europe
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
-
commodities
-
energy sources (1)
-
metal ores
-
copper ores (1)
-
nickel ores (1)
-
-
mineral deposits, genesis (1)
-
petroleum (3)
-
-
elements, isotopes
-
isotopes
-
stable isotopes
-
S-34/S-32 (1)
-
-
-
metals
-
hafnium (1)
-
-
oxygen (1)
-
sulfur
-
S-34/S-32 (1)
-
-
-
geochronology methods
-
K/Ar (1)
-
-
geologic age
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
lower Miocene (1)
-
-
-
-
-
Paleozoic
-
Cambrian
-
Lower Cambrian (2)
-
-
Ordovician
-
Middle Ordovician (1)
-
-
-
Phanerozoic (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic
-
Cryogenian (2)
-
Ediacaran (2)
-
Vendian (1)
-
-
Paleoproterozoic (1)
-
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
metaigneous rocks (1)
-
metasedimentary rocks (1)
-
-
turbidite (1)
-
-
minerals
-
carbonates (1)
-
silicates
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (2)
-
-
-
-
-
sulfides (1)
-
-
Primary terms
-
absolute age (2)
-
Africa
-
East Africa (1)
-
East African Rift (1)
-
-
Asia
-
Arabian Peninsula
-
Arabian Shield (1)
-
Oman
-
Oman Mountains (1)
-
-
Saudi Arabia (1)
-
-
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
lower Miocene (1)
-
-
-
-
-
economic geology (1)
-
energy sources (1)
-
Europe
-
Western Europe
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
fractures (1)
-
geophysical methods (2)
-
isotopes
-
stable isotopes
-
S-34/S-32 (1)
-
-
-
metal ores
-
copper ores (1)
-
nickel ores (1)
-
-
metals
-
hafnium (1)
-
-
metamorphic rocks
-
metaigneous rocks (1)
-
metasedimentary rocks (1)
-
-
mineral deposits, genesis (1)
-
oxygen (1)
-
paleoclimatology (1)
-
paleogeography (1)
-
Paleozoic
-
Cambrian
-
Lower Cambrian (2)
-
-
Ordovician
-
Middle Ordovician (1)
-
-
-
petroleum (3)
-
Phanerozoic (1)
-
plate tectonics (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic
-
Cryogenian (2)
-
Ediacaran (2)
-
Vendian (1)
-
-
Paleoproterozoic (1)
-
-
-
-
sea-level changes (1)
-
sedimentary rocks
-
carbonate rocks (1)
-
clastic rocks
-
diamictite (1)
-
shale (1)
-
-
-
sedimentation (1)
-
slope stability (1)
-
sulfur
-
S-34/S-32 (1)
-
-
tectonics (2)
-
-
rock formations
-
Ara Group (1)
-
Huqf Supergroup (5)
-
-
sedimentary rocks
-
sedimentary rocks
-
carbonate rocks (1)
-
clastic rocks
-
diamictite (1)
-
shale (1)
-
-
-
siliciclastics (1)
-
turbidite (1)
-
volcaniclastics (1)
-
-
sediments
-
siliciclastics (1)
-
turbidite (1)
-
volcaniclastics (1)
-
Marsham Formation
Representative section through the Marsham Formation at section B, paleocur...
Siliciclastic sedimentation in the interlude between two Neoproterozoic glaciations, Mirbat area, southern Oman: A missing link in the Huqf Supergroup?
A composite stratigraphy for the Neoproterozoic Huqf Supergroup of Oman: integrating new litho-, chemo- and chronostratigraphic data of the Mirbat area, southern Oman
Proposed composite section of Cryogenian Model (from Rieu and Allen, 200...
Field photographs of representative lithofacies of the upper Arkahawl Forma...
The Ayn Formation of the Mirbat Group, Dhofar, Oman
Abstract Glacial deposits are found in the Ayn Formation and Shareef Formation of the Mirbat Group close to Mirbat in Dhofar, southern Oman. The Mirbat Group is most likely a correlative of the Abu Mahara Group of the Huqf Supergroup of northern Oman. The Ayn Formation, the main subject of this chapter, comprises <400 m of mainly coarse-grained glaciogenic deposits, ponded in 2- to >8-km-wide N- to NW-oriented palaeovalleys eroded into crystalline basement, with few or no deposits preserved on intervening palaeohighs. The Shareef Formation occurs as thin, lenticular, erosional remnants beneath the unconformably overlying Cretaceous. The Ayn Formation is overlain by a thin (<3 m), discontinuous cap carbonate that passes from carbonate-cemented talus on the basin margin to stromatolitic carbonate on palaeohighs and resedimented gravity flows on palaeovalley flanks. The Ayn Formation is younger than its youngest detrital zircons and the youngest late plutons in crystalline basement, constraining it to < c . 720 Ma, but its exact age is unknown. The detrital zircon population comprises exclusively Neoproterozoic sources, suggesting derivation from the juvenile Neoproterozoic crust of the Arabian area. The composition of fine-grained matrix in glaciogenic diamictite units and of non-glacial mudstones, plotted using the chemical index of alteration (CIA), suggests strong variations in the intensity of palaeoweathering on contemporary land surfaces between the mechanical weathering-dominated Ayn Formation, and the chemical weathering-dominated overlying Arkahawl Formation, which supports the notion of major glaciation followed by rapid climatic transit as basin margins were flooded and buried with sediment during post-glacial transgression. The carbon isotopic ratio (δ 13 C) of the post-glacial carbonate is strongly variable from −3.5‰ to +5.8‰, whereas carbonate fissures in the underlying basement range between +4.1‰ and +5.7‰. Two independent palaeomagnetic studies have yielded low palaeomagnetic latitudes for the Mirbat Group.