tag:blogger.com,1999:blog-5859094080858570248.post6217218289106075964..comments2024-03-28T13:00:43.523+05:30Comments on Rapid Uplift: My Rather Tenuous Connection With The Mars Rover Project ScientistSuvrat Kherhttp://www.blogger.com/profile/18281172632784780810noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5859094080858570248.post-36967940748914476342012-08-09T22:30:38.132+05:302012-08-09T22:30:38.132+05:30Is there any evidence that Proterozoic dolomite ha...Is there any evidence that Proterozoic dolomite has biotic origins?.. hmm good question :)<br /><br />many Proterozoic dolomites have been interpreted to have aragonite precursors. .. but the replacement of aragonite to dolomite seemed to have occurred very early just a few cm below the sediment water interface.. its likely that microbial removal of sulphate may have favored this early dolomitization.. besides very early replacement there is increasing evidence of precipitation of dolomite cement from marine fluids in pore spaces of grainy facies like oolites and reefs. again the reasons were likely a combination of elevated Mg/Ca ratios and anoxia which promoted microbial growth and sulphate removal.. <br /><br /><a href="http://www.sciencedirect.com/science/article/pii/S0037073812000401" rel="nofollow">this</a> is a good reference paper.. if u don't have access email me suvrat underscore k at yahoo dot com and I'll send u a pdf.Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-83672141196368740572012-08-09T21:05:39.669+05:302012-08-09T21:05:39.669+05:30Thanks for the post, I’m happy you wrote about Pro...Thanks for the post, I’m happy you wrote about Proterozoic carbonate platforms instead of Mars! I just put up a post about early Proterozoic metadolomite and stromatolites ... well, kinda ... as habitat for wildflowers :) But I’d like to devote a post to the subject one of these days. I looked again at your discussion (June 28) re microbiota and dolomite of the Phanerozoic. Is there any evidence that Proterozoic dolomite has biotic origins?Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.com