Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Lawrence E. Mack"'
Publikováno v:
Geochimica et Cosmochimica Acta. 61:1995-2006
Several gram-size samples of
Autor:
James H. Wittke, Lawrence E. Mack
Publikováno v:
The Journal of Geology. 101:333-344
Rocks of the Uvalde portion of the Balcones igneous province of south-central Texas include nephelinite, basanite, alkali basalt, and phonolite. The nephelinites and basanite represent primitive, potentially primary, magmas based on high Mg#, high Ni
Autor:
Fred W. McDowell, Lawrence E. Mack, Kathryn Manser, Desmond E. Moser, James N. Connelly, Todd B. Housh, Douglas Smith
Publikováno v:
Geochemistry, Geophysics, Geosystems. 5
[1] Eclogite and pyroxenite xenoliths from ultramafic diatremes of the Navajo province on the Colorado Plateau have been analyzed to investigate hydration of continental mantle and effects of low-angle subduction on the mantle wedge. Xenoliths have b
Publikováno v:
AAPG Bulletin. 79
Autor:
Lawrence E. Mack, Rickard S. Toomey, M. Jennifer Cooke, Jay L. Banner, Libby A. Stern, Thomas W. Stafford
Publikováno v:
Geology. 31:853
Strontium isotopes are a unique tool to study soil-erosion dynamics. Changes in Sr isotope ratios ( 87 Sr/ 86 Sr) provide a record of late Quaternary landscape denudation of the Edwards Plateau of central Texas, United States. The use of Sr isotopes
Autor:
David N. Awwiller, Lawrence E. Mack
Publikováno v:
Geology. 19:311
Sm-Nd model ages of sandstones and shales from the Oligocene Frio Formation of south Texas and the Paleocene-Eocene Wilcox Group of south-central Texas increase with increasing depth of burial. Depleted-mantle model ages (Tdm) of Frio shales increase
Autor:
David N. Awwiller, Lawrence E. Mack
Publikováno v:
AAPG Bulletin. 73
Sm-Nd analyses of sandstones and shales from the Wilcox Group (Upper Paleocene-Lower Eocene) suggest that the whole rock Sm-Nd signature is changed by burial diagenesis. The samples are from the San Marcos arch, south-central Texas, at depths ranging