Wayne Premo (Former Employee)
Science and Products
Filter Total Items: 68
Pb-isotopic systematics of lunar highland rocks (>3.9 Ga): Constraints on early lunar evolution Pb-isotopic systematics of lunar highland rocks (>3.9 Ga): Constraints on early lunar evolution
The present lead (Pb)-isotopic database of over 200 analyses from nearly 90 samples of non-mare basalt, lunar highland rocks (>3.9 Ga) delineate at least three isotopically distinct signatures that in some combination can be interpreted to characterize the systematics of the entire database. Two are fairly new sets of lunar data and are typical of Pb data from other solar-system objects...
Authors
W. R. Premo, M. Tatsumoto, Keiji Misawa, N. Nakamuka, N. I. Kita
U-Th-Pb isotopic systematics of lherzolithic shergotite Yamato-793605 U-Th-Pb isotopic systematics of lherzolithic shergotite Yamato-793605
No abstract available.
Authors
Keiji Misawa, N. Nakamura, Wayne R. Premo, M. Tatsumoto
U-Pb age of an older metamorphic group mica schist: Earliest terrain of the eastern Indian craton U-Pb age of an older metamorphic group mica schist: Earliest terrain of the eastern Indian craton
No abstract available.
Authors
A. R. Basu, M. Sharma, Wayne R. Premo
Pb isotopic systematics of Angrite Asuka 881371 Pb isotopic systematics of Angrite Asuka 881371
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
A precise 232Th-208Pb chronology of fine-grained monazite: Age of the Bayan Obo REE-Fe-Nb ore deposit, China A precise 232Th-208Pb chronology of fine-grained monazite: Age of the Bayan Obo REE-Fe-Nb ore deposit, China
We have obtained precise Th-Pb internal isochron ages on monazite and bastnaesite for the world's largest known rare earth elements (REE)-Fe-Nb ore deposit, the Bayan Obo of Inner Mongolia, China. The monazite samples, collected from the carbonate-hosted ore zone, contain extremely small amounts of uranium (less than 10 ppm) but up to 0.7% ThO2. Previous estimates of the age of...
Authors
Jingyuan Wang, M. Tatsumoto, X. Li, W. R. Premo, E. C. T. Chao
U-Pb provenance ages of shocked zircons from the K-T boundary, Raton Basin, Colorado U-Pb provenance ages of shocked zircons from the K-T boundary, Raton Basin, Colorado
No abstract available.
Authors
Wayne R. Premo, G. A. Izett
Isotopic ages and characteristics of ancient (pre-Serenitatis) lunar crustal rocks at Apollo 17 Isotopic ages and characteristics of ancient (pre-Serenitatis) lunar crustal rocks at Apollo 17
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
U-Th-Pb, Rb-Sr, and Sm-Nd isotopic systematics of lunar troctolitic cumulate 76535: Implications on the age and origin of this early lunar, deep-seated cumulate U-Th-Pb, Rb-Sr, and Sm-Nd isotopic systematics of lunar troctolitic cumulate 76535: Implications on the age and origin of this early lunar, deep-seated cumulate
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
Isotopic signatures of black tektites from the K‐T boundary on Haiti: Implications for the age and type of source material Isotopic signatures of black tektites from the K‐T boundary on Haiti: Implications for the age and type of source material
U‐Th‐Pb, Rb‐Sr, and Sm‐Nd isotopic signatures of corroded, but unaltered, black glassy tektites from Cretaceous‐Tertiary (K‐T) boundary rock on Haiti are not consistent with their derivation from an impact on MOR‐derived oceanic crust or continental regions involving middle Proterozoic or older crustal material. Two single‐grain and two batches of these tektites yielded present‐day ∍Nd =...
Authors
Wayne R. Premo, G. A. Izett
U-Pb isotopic characteristics of lunar meteorites Yamato-793274 and Yamato-86032 U-Pb isotopic characteristics of lunar meteorites Yamato-793274 and Yamato-86032
No abstract available.
Authors
Mistunobu Tatsumoto, Wayne R. Premo
U-Th-Pb Isotopic Systematics of Lunar Norite 78235 U-Th-Pb Isotopic Systematics of Lunar Norite 78235
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
U-Pb and Sm-Nd ages for the Stillwater Complex and its associated sills and dikes, Beartooth Mountains, Montana: Identification of a parent magma? U-Pb and Sm-Nd ages for the Stillwater Complex and its associated sills and dikes, Beartooth Mountains, Montana: Identification of a parent magma?
Seven analyses from two samples of the Lower Banded series of the Stillwater Complex, Montana, yielded a U-Pb zircon-baddeleyite age of 2705 ±4 Ma. A more precise age of 2704 ±1 Ma is obtained if we regress only five of seven analyses. In either case, the age is in very good agreement with the previously reported Sm-Nd mineral isochron age of 2701 ±8 Ma for a gabbro from the Lower Banded...
Authors
W. R. Premo, Rosalind Tuthill Helz, M. L. Zientek, R.B. Langston
Science and Products
Filter Total Items: 68
Pb-isotopic systematics of lunar highland rocks (>3.9 Ga): Constraints on early lunar evolution Pb-isotopic systematics of lunar highland rocks (>3.9 Ga): Constraints on early lunar evolution
The present lead (Pb)-isotopic database of over 200 analyses from nearly 90 samples of non-mare basalt, lunar highland rocks (>3.9 Ga) delineate at least three isotopically distinct signatures that in some combination can be interpreted to characterize the systematics of the entire database. Two are fairly new sets of lunar data and are typical of Pb data from other solar-system objects...
Authors
W. R. Premo, M. Tatsumoto, Keiji Misawa, N. Nakamuka, N. I. Kita
U-Th-Pb isotopic systematics of lherzolithic shergotite Yamato-793605 U-Th-Pb isotopic systematics of lherzolithic shergotite Yamato-793605
No abstract available.
Authors
Keiji Misawa, N. Nakamura, Wayne R. Premo, M. Tatsumoto
U-Pb age of an older metamorphic group mica schist: Earliest terrain of the eastern Indian craton U-Pb age of an older metamorphic group mica schist: Earliest terrain of the eastern Indian craton
No abstract available.
Authors
A. R. Basu, M. Sharma, Wayne R. Premo
Pb isotopic systematics of Angrite Asuka 881371 Pb isotopic systematics of Angrite Asuka 881371
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
A precise 232Th-208Pb chronology of fine-grained monazite: Age of the Bayan Obo REE-Fe-Nb ore deposit, China A precise 232Th-208Pb chronology of fine-grained monazite: Age of the Bayan Obo REE-Fe-Nb ore deposit, China
We have obtained precise Th-Pb internal isochron ages on monazite and bastnaesite for the world's largest known rare earth elements (REE)-Fe-Nb ore deposit, the Bayan Obo of Inner Mongolia, China. The monazite samples, collected from the carbonate-hosted ore zone, contain extremely small amounts of uranium (less than 10 ppm) but up to 0.7% ThO2. Previous estimates of the age of...
Authors
Jingyuan Wang, M. Tatsumoto, X. Li, W. R. Premo, E. C. T. Chao
U-Pb provenance ages of shocked zircons from the K-T boundary, Raton Basin, Colorado U-Pb provenance ages of shocked zircons from the K-T boundary, Raton Basin, Colorado
No abstract available.
Authors
Wayne R. Premo, G. A. Izett
Isotopic ages and characteristics of ancient (pre-Serenitatis) lunar crustal rocks at Apollo 17 Isotopic ages and characteristics of ancient (pre-Serenitatis) lunar crustal rocks at Apollo 17
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
U-Th-Pb, Rb-Sr, and Sm-Nd isotopic systematics of lunar troctolitic cumulate 76535: Implications on the age and origin of this early lunar, deep-seated cumulate U-Th-Pb, Rb-Sr, and Sm-Nd isotopic systematics of lunar troctolitic cumulate 76535: Implications on the age and origin of this early lunar, deep-seated cumulate
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
Isotopic signatures of black tektites from the K‐T boundary on Haiti: Implications for the age and type of source material Isotopic signatures of black tektites from the K‐T boundary on Haiti: Implications for the age and type of source material
U‐Th‐Pb, Rb‐Sr, and Sm‐Nd isotopic signatures of corroded, but unaltered, black glassy tektites from Cretaceous‐Tertiary (K‐T) boundary rock on Haiti are not consistent with their derivation from an impact on MOR‐derived oceanic crust or continental regions involving middle Proterozoic or older crustal material. Two single‐grain and two batches of these tektites yielded present‐day ∍Nd =...
Authors
Wayne R. Premo, G. A. Izett
U-Pb isotopic characteristics of lunar meteorites Yamato-793274 and Yamato-86032 U-Pb isotopic characteristics of lunar meteorites Yamato-793274 and Yamato-86032
No abstract available.
Authors
Mistunobu Tatsumoto, Wayne R. Premo
U-Th-Pb Isotopic Systematics of Lunar Norite 78235 U-Th-Pb Isotopic Systematics of Lunar Norite 78235
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto
U-Pb and Sm-Nd ages for the Stillwater Complex and its associated sills and dikes, Beartooth Mountains, Montana: Identification of a parent magma? U-Pb and Sm-Nd ages for the Stillwater Complex and its associated sills and dikes, Beartooth Mountains, Montana: Identification of a parent magma?
Seven analyses from two samples of the Lower Banded series of the Stillwater Complex, Montana, yielded a U-Pb zircon-baddeleyite age of 2705 ±4 Ma. A more precise age of 2704 ±1 Ma is obtained if we regress only five of seven analyses. In either case, the age is in very good agreement with the previously reported Sm-Nd mineral isochron age of 2701 ±8 Ma for a gabbro from the Lower Banded...
Authors
W. R. Premo, Rosalind Tuthill Helz, M. L. Zientek, R.B. Langston