Abstract
The Helen iron formation consists of an upper zone of banded chert-carbonate and a lower siderite zone rich in pyrite near the top. The footwall rocks are volcanics, rhyolitic to the west and dacitic to the east, and are intensely altered to a distance of about 150 feet stratigraphically below the iron formation. The areal patterns of chemical changes in the footwall rocks are clearly similar to the patterns of compositional variation in the iron formation, indicating a common origin. The same volcanic solutions are believed to have altered the footwall rocks and deposited the iron formation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
