Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Muhammad Shafiqullah"'
Publikováno v:
Geofísica Internacional, Vol 34, Iss 1, Pp 67-77 (1995)
Fechamientos radiométricos por el método K-Ar, en flujos de rocas volcánicas intercaladas y suprayacientes a conglomerados volcanogénicos y areniscas de origen continental en Sonora, México, arrojan edades comprendidas entre 33 y 5 m.a. Entre é
Externí odkaz:
https://doaj.org/article/dd2d60d883b144cf864f1c442ffdb82b
Autor:
Stephen J. Reynolds, Stephen M. Richard, Robert J. Miller, W.G. Gilbert, Michael J. Grubensky, Jon E. Spencer, Muhammad Shafiqullah
Publikováno v:
Journal of Geophysical Research: Solid Earth. 100:10321-10351
Cenozoic magmatism in southwestern Arizona, which is within the Basin and Range tectonic province, occurred almost entirely between 15 and 25 Ma. Volcanic rocks typically consist, in ascending order, of (1) a thin sequence of mafic to intermediate la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b18b82b74ce575072c688a887d37611
https://doi.org/10.1029/94jb02817
https://doi.org/10.1029/94jb02817
Publikováno v:
Tectonics. 11:204-227
Paleomagnetic data from volcanic and crystalline rocks elucidate the evolution of a major Miocene accommodation zone in the northern Colorado River extensional corridor. The accommodation zone is a 10-km-wide belt of intermeshing conjugate normal fau
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1d67b05fee33898c4a17a42123dfc54
https://doi.org/10.1029/91tc00869
https://doi.org/10.1029/91tc00869
Autor:
James R. O'Neil, Paul L. Heller, Nancy S. Winslow, David R. Pevear, Muhammad Shafiqullah, R.W. Tabor
Publikováno v:
Geological Society of America Bulletin. 104:140-153
Conventional modal sandstone data from Paleogene units of the Pacific Northwest are not precise enough to pinpoint source areas and constrain displacement histories of accreted sedimentary terranes. Isotopic provenance study, used in conjunction with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c10322ab52d0fe6f1e0a366a4774400
https://doi.org/10.1130/0016-7606(1992)104<0140:ipopsf>2.3.co
https://doi.org/10.1130/0016-7606(1992)104<0140:ipopsf>2.3.co
Autor:
Yemane Asmeroma, William R. Dickinson, Robert E. Zartman, Paul E. Damon, Muhammad Shafiqullah
Publikováno v:
Chemical Geology: Isotope Geoscience section. 87:167-173
We report a nine-point RbSr whole-rock isochron age of 70±3 Ma (MSWD 3.97) for Mid-Jurassic volcanic rocks. The same rocks have also been dated by the UThPb method on zircon, giving a crystallization age of 166 ± 11 Ma, over twice as old a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::deac441d420d6e35d909a3a61edd06b0
https://doi.org/10.1016/0168-9622(91)90019-s
https://doi.org/10.1016/0168-9622(91)90019-s
Autor:
Yi-Pu Huang, Muhammad Shafiqullah, Janet L. Slate, William B. Bull, Daniel J. Lynch, Teh-Lung Ku
Publikováno v:
Quaternary Research. 35:400-416
Uranium-series methods were used to date and evaluate pedogenic CaCO3 genesis in the Pinacate volcanic field, northwestern Sonora, Mexico. Soils are developed in eolian deposits on lava flows. 230Th/234U dates of pedogenic carbonate are mininum soil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cb7f99dfbf98edb12538c0b08542628
https://doi.org/10.1016/0033-5894(91)90053-8
https://doi.org/10.1016/0033-5894(91)90053-8
Publikováno v:
Geological Society of America Bulletin. 102:1280-1296
The Rio Grande rift is one of the major late Cenozoic continental rifts of the world, sharing most geophysical, geochemical, and geological characteristics with other rifts. Cenozoic evolution of the rift was synchronous with lithospheric plate inter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::599b2e4b5a93b14ee168078670bebc96
https://doi.org/10.1130/0016-7606(1990)102<1280:csapon>2.3.co
https://doi.org/10.1130/0016-7606(1990)102<1280:csapon>2.3.co
Publikováno v:
Geological Society of America Bulletin. 102:961-968
Volcanic and plutonic rocks and associated sediments in the Santa Rita Mountains, southeast Arizona, represent one of the most complete Mesozoic sections in the Cordillera. Zircon from the lower member of the Mt. Wrightson Formation, the oldest of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03f6cea32b6899a7e0f17872746095e7
https://doi.org/10.1130/0016-7606(1990)102<0961:zutpaw>2.3.co
https://doi.org/10.1130/0016-7606(1990)102<0961:zutpaw>2.3.co
Publikováno v:
Journal of Geophysical Research. 95:19327
In this paper we present geologic mapping, K-Ar chronology, major and trace element data, mineral chemistry, and Nd, Sr, and O isotopic data for volcanic rocks of the Mount Taylor volcanic field (MTVF). The MTVF lies on the tectonic boundary between
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a02fe95742f30d6f08bdb92360621b5
https://doi.org/10.1029/jb095ib12p19327
https://doi.org/10.1029/jb095ib12p19327
Publikováno v:
Earth and Planetary Science Letters. 76:361-374
Fifty-one lamprophyre dikes of the Navajo volcanic field are randomly oriented in contrast to dikes of similar age from adjacent tectonic provinces. K Ar ages obtained on nine of these dikes indicate that they were emplaced between 28 and 19 m.y. ago
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d64f9a10979188e312400143f7bbeb74
https://doi.org/10.1016/0012-821x(86)90087-7
https://doi.org/10.1016/0012-821x(86)90087-7