Update search
- 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
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Southern Africa
-
South Africa
-
Free State South Africa
-
Vredefort Dome (1)
-
-
-
-
-
Asia
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Northeastern India
-
Arunachal Pradesh India (1)
-
-
-
Jammu and Kashmir
-
Ladakh (1)
-
-
-
-
Australasia
-
Australia
-
Western Australia (1)
-
-
-
Black Mountains (1)
-
Canada
-
Eastern Canada
-
Ontario
-
Sudbury igneous complex (1)
-
-
-
-
Death Valley (1)
-
Jack Hills (1)
-
United States
-
California
-
Inyo County California (1)
-
San Bernardino County California (1)
-
-
Mojave Desert (1)
-
-
-
elements, isotopes
-
metals
-
lead (1)
-
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (1)
-
thermochronology (1)
-
U/Pb (3)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Pleistocene
-
Bishop Tuff (1)
-
-
-
Tertiary
-
Neogene
-
Miocene (2)
-
Pliocene (1)
-
-
Paleogene
-
Eocene (1)
-
Oligocene (2)
-
-
-
-
Precambrian
-
Archean (2)
-
Hadean (2)
-
-
-
igneous rocks
-
igneous rocks
-
granophyre (2)
-
plutonic rocks
-
diorites (1)
-
granites
-
leucogranite (1)
-
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses (2)
-
impactites (1)
-
-
-
minerals
-
phosphates
-
apatite (1)
-
-
silicates
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (1)
-
-
-
silica minerals
-
quartz (1)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (5)
-
-
-
-
sheet silicates
-
mica group
-
biotite (1)
-
muscovite (2)
-
-
-
-
-
Primary terms
-
absolute age (4)
-
Africa
-
Southern Africa
-
South Africa
-
Free State South Africa
-
Vredefort Dome (1)
-
-
-
-
-
Asia
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Northeastern India
-
Arunachal Pradesh India (1)
-
-
-
Jammu and Kashmir
-
Ladakh (1)
-
-
-
-
Australasia
-
Australia
-
Western Australia (1)
-
-
-
Canada
-
Eastern Canada
-
Ontario
-
Sudbury igneous complex (1)
-
-
-
-
Cenozoic
-
Quaternary
-
Pleistocene
-
Bishop Tuff (1)
-
-
-
Tertiary
-
Neogene
-
Miocene (2)
-
Pliocene (1)
-
-
Paleogene
-
Eocene (1)
-
Oligocene (2)
-
-
-
-
crust (2)
-
faults (1)
-
heat flow (1)
-
igneous rocks
-
granophyre (2)
-
plutonic rocks
-
diorites (1)
-
granites
-
leucogranite (1)
-
-
-
-
intrusions (1)
-
magmas (1)
-
metals
-
lead (1)
-
-
metamorphic rocks
-
gneisses (2)
-
impactites (1)
-
-
metamorphism (1)
-
orogeny (1)
-
plate tectonics (2)
-
Precambrian
-
Archean (2)
-
Hadean (2)
-
-
tectonics (1)
-
United States
-
California
-
Inyo County California (1)
-
San Bernardino County California (1)
-
-
Mojave Desert (1)
-
-
GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
Microstructural changes and Pb mobility during the zircon to reidite transformation: Implications for planetary impact chronology Available to Purchase
Detrital zircon provenance of the Indus Group, Ladakh, NW India: Implications for the timing of the India-Asia collision and other syn-orogenic processes Available to Purchase
Structural evolution of central Death Valley, California, using new thermochronometry of the Badwater turtleback Open Access
Differentiated impact melt sheets may be a potential source of Hadean detrital zircon: COMMENT Open Access
From the Hadean to the Himalaya: 4.4 Ga of felsic terrestrial magmatism Available to Purchase
Zircon formation in impact melts: Complications for deciphering planetary impact histories Available to Purchase
We explore the formation conditions and inheritance probability of zircon in impact melts and the implications of using zircon geochronology to investigate planetary impact histories. By modeling the occurrence and crystallization temperature spectrum for zircon in simulated impact melts, we predict the presence of such grains within impactites. We also report U-Pb geochronology of sieve-textured, possibly poikilitic, zircon identified in the pseudotachylyte and granophyre units present within the largest known terrestrial impact crater (Vredefort, South Africa) to explore the accuracy of these grains in dating impact events at an impact structure of known age. Zircons with similar textures have been recently interpreted as growing in an impact melt in lunar meteorite SaU 169 and used to determine the age of the Imbrium impact. Modeling in simulated lunar melt compositions predicts crystallization of zircon in merely ~2% of melting events, in this case via impact. The modeled crystallization temperature spectrum is significantly below Ti-in-zircon crystallization temperatures reported from lunar samples. Zircon formation within an impact melt is dictated by saturation of [Zr] and requires a high abundance for lunar melt compositions. This essentially rules out the possibility of zircon growing in equilibrium with lunar meteorites. Poikilitic textures may be inherited from the lunar crust, presumably due to rapid decompression and/or resorption into an undersaturated magma, as previously recognized in plagioclase. Although either scenario could be due to an impact, endogenic processes cannot be ruled out, and thus lunar poikilitic zircons may not be recording impact melting events. Secondary ion mass spectrometry U-Pb analysis of zircon with similar textures from Vredefort clearly shows that these grains are inherited from the Archean target rocks, with varying degrees of Pb loss, and consequently cannot be used to accurately identify the age of the Vredefort impact structure. Further understanding of the growth and isotopic effects on zircon of shock and heating associated with large impacts could provide another tool that can be used to probe planetary impact histories.