Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core

Details Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24...87b&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 87-88 (SEE N94-12015 01-91)

Physics

Breccia, Core Sampling, Iowa, Lithology, Metamorphism (Geology), Mineral Deposits, Minerals, Petrography, Planetary Geology, Recrystallization, Shales, Crystallinity, Grain Size, High Temperature, Isotropy, Porosity, Rocks

Scientific paper

The M-1 core was drilled on the eastern edge of the central uplift within the Manson Impact Structure in Iowa. The lower 107.9 m of the core consists of crystalline breccias. Twelve intervals of thin sections from this core have been studied for preliminary discussion. The breccias are divided into three units by matrix size and abundance. Unit 1 is characterized by a high volume fraction of matrix, and a decreasing proportion of matrix with depth. This matrix is nearly isotropic and consists of grains less than 0.005 to less than 0.02 mm in length. The matrix between 112 and 146 meters depth consists of a crystalline intergrowth of felsic and opaque minerals with or without chlorite. This was the hottest section of the core after impact, and may have undergone high temperature metamorphic recrystallization. Unit 2 is transitional between units 1 and 3, and is delineated by a rapid increase in grain size to .01-.04 mm and a decrease in matrix abundance to 10 percent. Unit 3 has a coarse, often porous matrix, whose abundance changes from about 10 percent at the top to about 2 percent at the base. Grain sizes range from 0.01-0.1 mm over this interval and coarsen with depth. Changes in the character of the matrix as well as the changes in clast lithology and abundance outlined below suggest that unit 3 is in-situ brecciated basement with injected melt and shale fragments; unit 1 is a crater veneer deposit consisting of transported basement materials and unit 2 is a mixed zone between units 1 and 3.

Affiliated with

Also associated with

No associations

Rating

Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Petrography and preliminary interpretations of the crystalline breccias from the Manson M-1 core will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1446976