Zobrazeno 1 - 10
of 68
pro vyhledávání: '"G.B. Morey"'
Autor:
Peter L. McSwiggen, G.B. Morey
Publikováno v:
Regulatory Toxicology and Pharmacology. 52:S11-S25
The mineralogy of the Biwabik Iron Formation changes dramatically from west to east as the formation nears the basal contact of the Duluth Complex. This reflects a contact metamorphism that took place with the emplacement of the igneous Duluth Comple
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a053baafdab8e4d2cf01035bcbc3720
https://doi.org/10.1016/j.yrtph.2007.09.010
https://doi.org/10.1016/j.yrtph.2007.09.010
Publikováno v:
Regulatory Toxicology and Pharmacology. 52:S5-S10
The Biwabik Iron Formation is a approximately 1.9 billion year-old sequence of iron-rich sedimentary rocks that was metamorphosed at its eastern-most extent by approximately 1.1 billion year-old intrusions of the Duluth Complex. The metamorphic recry
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32e2da533390bcfc7bb2c558789b58ee
https://doi.org/10.1016/j.yrtph.2007.09.009
https://doi.org/10.1016/j.yrtph.2007.09.009
Autor:
Eugene I. Smith, Klaus J. Schulz, G. N. Hanson, R. L. Bauer, R.W. Ojakangas, V.W. Chandler, D. L. Southwick, G.B. Morey, W. R. Van Schmus, J. L. Anderson, J. Kalliokoski, P. K. Sims, Zell E. Peterman, P. W. Weiblen, M. G. Mudrey, S. B. Shirey
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1bac9c19785a6a7e8e32361f21f8f2d9
https://doi.org/10.1130/dnag-gna-c2.11
https://doi.org/10.1130/dnag-gna-c2.11
Publikováno v:
Sedimentary Geology. :319-341
The peneplaned Archean craton in the Lake Superior region was the platform upon which a continental margin assemblage was deposited. Extension resulted in localized rifts that received thicker accumulations of sediments and volcanic rocks than did ad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c1a3b1e2fd364d40658ec63e4316370
https://doi.org/10.1016/s0037-0738(01)00081-1
https://doi.org/10.1016/s0037-0738(01)00081-1
Publikováno v:
Sedimentary Geology. :421-442
Exposures in the Lake Superior region, and associated geophysical evidence, show that a 2000 km-long rift system developed within the North American craton ∽1109–1087 Ma, the age span of most of the volcanic rocks. This system is characterized by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f144553fd7ac041901c86d19ca40f1a
https://doi.org/10.1016/s0037-0738(01)00085-9
https://doi.org/10.1016/s0037-0738(01)00085-9
Publikováno v:
Economic Geology. 91:1282-1291
Concentrations of tourmaline in Early Proterozoic metasedimentary rocks of the Cuyuna iron range, east-central Minnesota, provide a basis for redefinition of the evolutionary history of the area. Manganiferous iron ore forms beds within the Early Pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::268ab23b170d8d484adb3dc05d126d3c
https://doi.org/10.2113/gsecongeo.91.7.1282
https://doi.org/10.2113/gsecongeo.91.7.1282
Publikováno v:
Mineralogical Magazine. 58:387-399
The recent discovery of hyalophane [(K,Ba)Al1−2Si3−2O8] on the North range segment of the Early Proterozoic Cuyuna Iron Range of east-central Minnesota has shed new light on the depositional environment of these rocks. This Ba-feldspar occurs in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5cd22baa84c6f8ff41bafc038b4c7ffa
https://doi.org/10.1180/minmag.1994.058.392.04
https://doi.org/10.1180/minmag.1994.058.392.04
Autor:
V.W. Chandler, G.B. Morey, David L. Daniels, K. R. Wirth, Suzanne W. Nicholson, Terrence J. Boerboom, William F. Cannon, Jeffrey D. Phillips, M.G. Mudrey, Laurel G. Woodruff
Publikováno v:
Eos, Transactions American Geophysical Union. 82:97-97
New aeromagnetic data from the north central United States are helping geophysicists and geologists better understand the 1.1-billion-year-old mid-continent rift, one of the fundamental components of the Precambrian basement of North America. A detai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ded31054f7a317e132e657b9a6f13cb
https://doi.org/10.1029/01eo00049
https://doi.org/10.1029/01eo00049
Autor:
G.B. Morey
Publikováno v:
Precambrian Research. 11:247-265
The Vermilion district and adjacent areas in northeastern Minnesota consist of a thick succession of subaqueous volcanic rocks and derivative sedimentary rocks which formed during the interval 2750-2700 Ma ago. The western part of the district is cha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d1ddee477bf95de6f7b783f52245d5c
https://doi.org/10.1016/0301-9268(80)90067-4
https://doi.org/10.1016/0301-9268(80)90067-4