Wayne Premo (Former Employee)
Science and Products
Filter Total Items: 68
Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado
Archean gneisses and Early Proterozoic metasedimentary rocks of the Wyoming Province are separated from Proterozoic eugeoclinal metamorphic rocks by a major east-west–trending shear zone called the Cheyenne belt. U-Pb zircon ages of Archean tonalites north of the Cheyenne belt denote an intrusive event at 2,700 Ma. Detrital zircons from Proterozoic metasedimentary rocks north of the...
Authors
Wayne R. Premo, W. R. Van Schmus
Pb isotopes in Anorthositic Breccias 67075 and 62237: A search for primitive lunar lead Pb isotopes in Anorthositic Breccias 67075 and 62237: A search for primitive lunar lead
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto, J. W. Wang
U-Th-Pb, Sm-Nd, Rb-Sr, and Lu-Hf systematics of Returned Mars Samples U-Th-Pb, Sm-Nd, Rb-Sr, and Lu-Hf systematics of Returned Mars Samples
No abstract available.
Authors
M. Tatsumoto, Wayne R. Premo
Precambrian ophiolites of Arabia: Geologic settings, U Pb geochronology, Pb-isotope characteristics, and implications for continental accretion Precambrian ophiolites of Arabia: Geologic settings, U Pb geochronology, Pb-isotope characteristics, and implications for continental accretion
Disrupted ophiolites occur in linear belts up to 900 km long between microplates that collided during the late Proterozoic to form the Arabian Shield. UPb zircon ages and Pb-isotope data from these ophiolitic rocks help constrain the history of accretion of the Arabian Shield and thereby contribute to the definition of its microplates and terranes. Terranes of the central and western...
Authors
J.S. Pallister, J. S. Stacey, L. B. Fischer, W. R. Premo
Precambrian ophiolites of Arabia; a summary of geologic settings, U-Pb geochronology, lead isotope characteristics, and implications for microplate accretion, Kingdom of Saudi Arabia Precambrian ophiolites of Arabia; a summary of geologic settings, U-Pb geochronology, lead isotope characteristics, and implications for microplate accretion, Kingdom of Saudi Arabia
Disrupted ophiolites occur in linear belts as much as 900 km long between micro plates that collided during the late Proterozoic to form the Arabian Shield. The U-Pb zircon ages and lead-isotope data from these ophiolitic rocks help constrain the history of accretion of the Arabian Shield and thereby contribute to the definition of its microplates and terranes. Microplates of the central...
Authors
John S. Pallister, J. S. Stacey, L. B. Fischer, W. R. Premo
Evolution of the Early Proterozoic Colorado province: Constraints from U-Pb geochronology Evolution of the Early Proterozoic Colorado province: Constraints from U-Pb geochronology
The Colorado province represents an addition of a belt of rocks more than 500 km wide to the southern margin of the Archean Wyoming craton during the Early Proterozoic, between about 1790 and 1660 Ma. Correspondence in ages between metamorphism, deformation, and plutonism; association of volcanic rocks with comagmatic calc-alkalic plutons; and lack of older basement are all consistent...
Authors
John C. Reed, M. E. Bickford, Wayne R. Premo, John N. Aleinikoff, John S. Pallister
Arabian Shield ophiolites and Late Proterozoic microplate accretion Arabian Shield ophiolites and Late Proterozoic microplate accretion
Fragments of Late Proterozoic ocean crust and mantle (ophiolites) occur within six major fault zones that mark sutures between crustal blocks (microplates) that were accreted between about 630 and 715 Ma to form the Arabian Shield. We report new U-Pb zircon ages for ophiolitic gabbro, diorite, and plagiogranite that range from 840 to 700 Ma and establish these complexes among the oldest...
Authors
John S. Pallister, J. S. Stacey, L. B. Fischer, Wayne R. Premo
Origin of lead from green glass of Apollo 15426: A search for primitive lunar lead. Origin of lead from green glass of Apollo 15426: A search for primitive lunar lead.
A major obstacle in lunar U-Pb chronology is the elusiveness of the primary Pb isotopic composition and U/Pb ratio and therefore the Pb evolution for the early history of the moon. In an attempt to seek the primitive lunar Pb isotopic composition, green glass from lunar clod 15426,49 was studied for U-Th-Pb systematics because it is extremely Mg-rich and known to be the most primitive...
Authors
M. Tatsumoto, W. R. Premo, D.M. Unruh
Science and Products
Filter Total Items: 68
Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado
Archean gneisses and Early Proterozoic metasedimentary rocks of the Wyoming Province are separated from Proterozoic eugeoclinal metamorphic rocks by a major east-west–trending shear zone called the Cheyenne belt. U-Pb zircon ages of Archean tonalites north of the Cheyenne belt denote an intrusive event at 2,700 Ma. Detrital zircons from Proterozoic metasedimentary rocks north of the...
Authors
Wayne R. Premo, W. R. Van Schmus
Pb isotopes in Anorthositic Breccias 67075 and 62237: A search for primitive lunar lead Pb isotopes in Anorthositic Breccias 67075 and 62237: A search for primitive lunar lead
No abstract available.
Authors
Wayne R. Premo, M. Tatsumoto, J. W. Wang
U-Th-Pb, Sm-Nd, Rb-Sr, and Lu-Hf systematics of Returned Mars Samples U-Th-Pb, Sm-Nd, Rb-Sr, and Lu-Hf systematics of Returned Mars Samples
No abstract available.
Authors
M. Tatsumoto, Wayne R. Premo
Precambrian ophiolites of Arabia: Geologic settings, U Pb geochronology, Pb-isotope characteristics, and implications for continental accretion Precambrian ophiolites of Arabia: Geologic settings, U Pb geochronology, Pb-isotope characteristics, and implications for continental accretion
Disrupted ophiolites occur in linear belts up to 900 km long between microplates that collided during the late Proterozoic to form the Arabian Shield. UPb zircon ages and Pb-isotope data from these ophiolitic rocks help constrain the history of accretion of the Arabian Shield and thereby contribute to the definition of its microplates and terranes. Terranes of the central and western...
Authors
J.S. Pallister, J. S. Stacey, L. B. Fischer, W. R. Premo
Precambrian ophiolites of Arabia; a summary of geologic settings, U-Pb geochronology, lead isotope characteristics, and implications for microplate accretion, Kingdom of Saudi Arabia Precambrian ophiolites of Arabia; a summary of geologic settings, U-Pb geochronology, lead isotope characteristics, and implications for microplate accretion, Kingdom of Saudi Arabia
Disrupted ophiolites occur in linear belts as much as 900 km long between micro plates that collided during the late Proterozoic to form the Arabian Shield. The U-Pb zircon ages and lead-isotope data from these ophiolitic rocks help constrain the history of accretion of the Arabian Shield and thereby contribute to the definition of its microplates and terranes. Microplates of the central...
Authors
John S. Pallister, J. S. Stacey, L. B. Fischer, W. R. Premo
Evolution of the Early Proterozoic Colorado province: Constraints from U-Pb geochronology Evolution of the Early Proterozoic Colorado province: Constraints from U-Pb geochronology
The Colorado province represents an addition of a belt of rocks more than 500 km wide to the southern margin of the Archean Wyoming craton during the Early Proterozoic, between about 1790 and 1660 Ma. Correspondence in ages between metamorphism, deformation, and plutonism; association of volcanic rocks with comagmatic calc-alkalic plutons; and lack of older basement are all consistent...
Authors
John C. Reed, M. E. Bickford, Wayne R. Premo, John N. Aleinikoff, John S. Pallister
Arabian Shield ophiolites and Late Proterozoic microplate accretion Arabian Shield ophiolites and Late Proterozoic microplate accretion
Fragments of Late Proterozoic ocean crust and mantle (ophiolites) occur within six major fault zones that mark sutures between crustal blocks (microplates) that were accreted between about 630 and 715 Ma to form the Arabian Shield. We report new U-Pb zircon ages for ophiolitic gabbro, diorite, and plagiogranite that range from 840 to 700 Ma and establish these complexes among the oldest...
Authors
John S. Pallister, J. S. Stacey, L. B. Fischer, Wayne R. Premo
Origin of lead from green glass of Apollo 15426: A search for primitive lunar lead. Origin of lead from green glass of Apollo 15426: A search for primitive lunar lead.
A major obstacle in lunar U-Pb chronology is the elusiveness of the primary Pb isotopic composition and U/Pb ratio and therefore the Pb evolution for the early history of the moon. In an attempt to seek the primitive lunar Pb isotopic composition, green glass from lunar clod 15426,49 was studied for U-Th-Pb systematics because it is extremely Mg-rich and known to be the most primitive...
Authors
M. Tatsumoto, W. R. Premo, D.M. Unruh