Clark, spiky ground mag profiles over laterite in West Africa are attributed to lightening strikes forming maghemite. Amplitudes are several orders of magnitude smaller then your observations but then laterite is not that magnetic to start with. Search of maghemite and lightening should bring up a number of references. Regards, Dick
Dick West Global Ni-PGM Geophysicist BHP Billiton World Exploration Inc BHP Billiton #1400-1111 West Georgia St, Vancouver, BC, V6E 4M3 Mailto: [EMAIL PROTECTED] Internet: http://bhpbilliton.com Phone: + 1 604 632 1450 Mobile: + 1 604 970 9462 Fax: + 1 604 683 4125 - EOM NOTICE - This message and any attached files may contain information that is confidential and/or subject of legal privilege intended only for use by the intended recipient. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, be advised that you have received this message in error and that any dissemination, copying or use of this message or attachment is strictly forbidden, as is the disclosure of the information therein. If you have received this message in error please notify the sender immediately and delete the message. _______________________________________________________ List archive: http://www.mail-archive.com/[email protected]
