tag:blogger.com,1999:blog-5859094080858570248.post2296131206189648600..comments2024-03-28T13:00:43.523+05:30Comments on Rapid Uplift: Field Photos: Western Uplands And Giant Plagioclase BasaltsSuvrat Kherhttp://www.blogger.com/profile/18281172632784780810noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-5859094080858570248.post-86264658057535110772017-07-25T23:33:10.932+05:302017-07-25T23:33:10.932+05:30Is this formation http://old.wikimapia.org/#lat=19...Is this formation http://old.wikimapia.org/#lat=19.3737988&lon=73.8854768&z=13&l=0&m=t interesting ? It is ~20km north east of Chavand. I find it very odd with respect to the surrounding<br />Khalil Sawanthttps://www.blogger.com/profile/06525256825696217687noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-11485349176958729742017-03-06T09:49:00.694+05:302017-03-06T09:49:00.694+05:30Great! yes, he's suggested that anorthosites c...Great! yes, he's suggested that anorthosites continued forming in the Phanerozoic at sites of continental flood basalts. good luck with your discussion!Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-45815029346794302902017-03-06T09:38:26.597+05:302017-03-06T09:38:26.597+05:30Thanks, Suvrat! I was able to download the paper a...Thanks, Suvrat! I was able to download the paper as the University has a subscription. The discussion of "possible supporting evidence and tests" is very helpful.<br /><br />I was intrigued by the mention of anorthosite formation -- I thought it was limited to the Archean. We have a "famous" complex nearby so I've read a bit about it -- enough to be confused ;-) Will look at those parts of the paper more carefully later.Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-34177232754631284832017-03-06T09:01:27.829+05:302017-03-06T09:01:27.829+05:30Hollis- sure, go ahead :).. regarding GPB there ar...Hollis- sure, go ahead :).. regarding GPB there are different views; a) some think of them as having crystallized in the same magma that eventually transported them to the surface b) phenocrysts formed in a magma genetically unrelated to the later thoelitic basalt that transports the plagioclase to the surface. This is the magma mixing idea -<br /><br />see this paper - http://gsabulletin.gsapubs.org/content/early/2016/02/01/B31404.1 <br /><br /> Geochemical criteria to recognize magma mixing is discussed. If you don't have access email me at suvrat underscore k at yahoo dot com. I'll send the pdf. Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-86420609480448136512017-03-06T06:39:12.912+05:302017-03-06T06:39:12.912+05:30Suvrat, may I show your two GPB photos tomorrow (w...Suvrat, may I show your two GPB photos tomorrow (with credit) in the event that I'm selected (by luck of the draw) to lead the discussion in our volcanism class? This week we're discussing magma mixing, and I've read that some consider the GPB to be a product of mixing (e.g. http://www.uqac.ca/mhiggins/deccan.html), which I presume is different from 2-stage crystallization (??, still learning). If that's the case, a good discussion question would be how to distinguish between the two situations.Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-57611037385223428622017-03-03T15:24:07.954+05:302017-03-03T15:24:07.954+05:30Thank you Sunita! :) Thank you Sunita! :) Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-90517198232684254092017-03-03T09:53:23.739+05:302017-03-03T09:53:23.739+05:30Wah Suvrat thos is so exciting to be able to see a...Wah Suvrat thos is so exciting to be able to see all this thrugh lens! Thank you and we are all very proud of you!Mrs. Cardiologyhttps://www.blogger.com/profile/09734255141321122227noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-5852381016777157902017-03-02T10:17:40.408+05:302017-03-02T10:17:40.408+05:30Hollis- yes these are classic basalt lava flows. H...Hollis- yes these are classic basalt lava flows. Hummocky and sheet flow units ("pa hoe hoe" type), pipe vesicles at the flow bottom and glassy rubbly flow tops are typical. Laccoliths seem to be absent from this part of the Deccan volcanic terrain. They are found in the Deccan volcanics in Kachchh region of Gujarath state where the magma has risen through block faulted Mesozoic sedimentary rocks.Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-62458038207529538312017-03-01T23:31:48.664+05:302017-03-01T23:31:48.664+05:30The GPB closeups caught my eye. They look so simil...The GPB closeups caught my eye. They look so similar in terms of phenocrysts to the plagioclase-hornblende porphyries of the Henry Mts in Utah, type locality of laccoliths. Why are shallow intrusions ruled out here? Is it because these are obviously lava flows ... ? In any case, very interesting and looking forward to the next post.Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.com