James Calzia (Former Employee)
Science and Products
Filter Total Items: 29
Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California
Open-File Report 03-096 contains a digital geologic map database of the Valjean Hills 7.5' quadrangle, San Bernardino County, California that includes: ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8. 2 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, and containing a Correlation of...
Authors
J.P. Calzia, Bennie W. Troxel, Christian G. Raumann
Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism
Mesozoic granitoid plutons in the southern Death Valley region of southeastern California reveal substantial compositional and isotopic diversity for Mesozoic magmatism in the southwestern US Cordillera. Jurassic plutons of the region are mainly calc-alkaline mafic granodiorites with εNdi of –5 to –16, 87Sr/86Sr i of 0.707–0.726, and 206Pb/204Pb i of 17.5–20.0. Cretaceous granitoids of...
Authors
O.T. Ramo, J.P. Calzia, P.J. Kosunen
Late Cenozoic crustal extension and magmatism, southern Death Valley region, California Late Cenozoic crustal extension and magmatism, southern Death Valley region, California
The late Cenozoic geologic history of the southern Death Valley region is characterized by coeval crustal extension and magamatism. Crustal extension is accommodated by numerous listric and planar normal faults as well as right- and left-lateral strike slip faults. The normal faults sip 30°-50° near the surface and flatten and merge leozoic miogeoclinal rocks; the strike-slip faults act...
Authors
J.P. Calzia, O.T. Ramo
Geologic map of the Kingston Range, southern Death Valley, California Geologic map of the Kingston Range, southern Death Valley, California
No abstract available.
Authors
J.P. Calzia, B.W. Troxel, L.A. Wright, B.C. Burchfiel, G. A. Davis, M.R. McMackin
Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies
The contrast in density between basin-filling deposits and underlying basement rocks in the Basin and Range province produces a distinctive pattern of gravity anomalies that roughly correlates with basin-and-range topography. This is especially apparent in the Death Valley extended terrane, where minima in residual gravity closely correspond to well-known extensional basins, such as...
Authors
Richard J. Blakely, Robert C. Jachens, James P. Calzia, Victoria Langenheim
Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia
Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show ϵNd values of −1.6 to −6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%–40% of their mass may be Archean crustal...
Authors
J.P. Calzia
Science and Products
Filter Total Items: 29
Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California
Open-File Report 03-096 contains a digital geologic map database of the Valjean Hills 7.5' quadrangle, San Bernardino County, California that includes: ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8. 2 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, and containing a Correlation of...
Authors
J.P. Calzia, Bennie W. Troxel, Christian G. Raumann
Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism Geochemistry of Mesozoic plutons, southern Death Valley region, California: Insights into the origin of Cordilleran interior magmatism
Mesozoic granitoid plutons in the southern Death Valley region of southeastern California reveal substantial compositional and isotopic diversity for Mesozoic magmatism in the southwestern US Cordillera. Jurassic plutons of the region are mainly calc-alkaline mafic granodiorites with εNdi of –5 to –16, 87Sr/86Sr i of 0.707–0.726, and 206Pb/204Pb i of 17.5–20.0. Cretaceous granitoids of...
Authors
O.T. Ramo, J.P. Calzia, P.J. Kosunen
Late Cenozoic crustal extension and magmatism, southern Death Valley region, California Late Cenozoic crustal extension and magmatism, southern Death Valley region, California
The late Cenozoic geologic history of the southern Death Valley region is characterized by coeval crustal extension and magamatism. Crustal extension is accommodated by numerous listric and planar normal faults as well as right- and left-lateral strike slip faults. The normal faults sip 30°-50° near the surface and flatten and merge leozoic miogeoclinal rocks; the strike-slip faults act...
Authors
J.P. Calzia, O.T. Ramo
Geologic map of the Kingston Range, southern Death Valley, California Geologic map of the Kingston Range, southern Death Valley, California
No abstract available.
Authors
J.P. Calzia, B.W. Troxel, L.A. Wright, B.C. Burchfiel, G. A. Davis, M.R. McMackin
Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies
The contrast in density between basin-filling deposits and underlying basement rocks in the Basin and Range province produces a distinctive pattern of gravity anomalies that roughly correlates with basin-and-range topography. This is especially apparent in the Death Valley extended terrane, where minima in residual gravity closely correspond to well-known extensional basins, such as...
Authors
Richard J. Blakely, Robert C. Jachens, James P. Calzia, Victoria Langenheim
Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia
Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show ϵNd values of −1.6 to −6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%–40% of their mass may be Archean crustal...
Authors
J.P. Calzia