Preliminary Draft Natural Resources Report
Author :
Publisher :
Page : 22 pages
File Size : 47,61 MB
Release : 1972
Category : Natural resources
ISBN :
Author :
Publisher :
Page : 22 pages
File Size : 47,61 MB
Release : 1972
Category : Natural resources
ISBN :
Author : Arizona Development Board
Publisher :
Page : 85 pages
File Size : 37,15 MB
Release : 1953*
Category :
ISBN :
Author : Québec (Province). Department of Natural Resources
Publisher :
Page : 0 pages
File Size : 38,29 MB
Release :
Category : Mines and mineral resources
ISBN :
Author : Raymond R. Anderson
Publisher :
Page : 60 pages
File Size : 44,75 MB
Release : 1997
Category : Geology
ISBN :
The Middle Proterozoic Midcontinent Rift System (MRS) of North America is a failed rift that formed in response to region-wide stresses about 1,100 Ma. In Iowa, the MRS is buried beneath 2,200-3,500 ft of Paleozoic and Mesozoic sedimentary rocks and Quaternary glaciogenic deposits. An extremely large volume of sediments was deposited within basins associated with the rift at several stages during its development. Although the uplift of a rift-axial horst resulted in the erosional removal of most of these clastic rocks from the central region of the MRS in Iowa, thick sequences are preserved in a series of horst-bounding basins. Recent studies incorporating petrographic analysis, geophysical modeling, and other analytical procedures have led to the establishment of a preliminary stratigraphy for these clastic rocks and interpretations of basin geometries. This information has allowed the refinement of existing theories and history of MRS formation in Iowa. Additionally, drill samples previously interpreted as indicating the existence of early Paleozoic basins overlying the Proterozoic MRS basins were re-examined. Samples previously interpreted as deep-lying Paleozoic rocks are now known to have caved from upper levels of the drillhole and were out of stratigraphic position. No deep Paleozoic basins exist in this area. These investigations led to the development of petrographic parameters useful in differentiating the Proterozoic MRS Red clastics from Paleozoic clastic rocks having similar lithologies.
Author :
Publisher :
Page : 1040 pages
File Size : 11,28 MB
Release :
Category : Government publications
ISBN :
Author : Texas
Publisher :
Page : 588 pages
File Size : 22,67 MB
Release : 1978
Category : Natural resources
ISBN :
Author : Québec (Province). Department of Natural Resources
Publisher :
Page : 52 pages
File Size : 46,88 MB
Release : 1976
Category : Mines and mineral resources
ISBN :
Author : Houston Chamber of Commerce. Research Committee. Natural Resources Division
Publisher :
Page : 231 pages
File Size : 27,45 MB
Release : 1956
Category : Geology
ISBN :
Author :
Publisher :
Page : 772 pages
File Size : 27,56 MB
Release : 1959
Category : Pacific Area
ISBN :
Author : United States. Federal Energy Regulatory Commission
Publisher :
Page : 1924 pages
File Size : 37,54 MB
Release :
Category : Energy conservation
ISBN :