Dear Researchers,
I have collected some Abor volcanic rocks from the Siang Valley, NE India, interestingly the volcanic rocks have shown the Upper Jurassic to Lower Cretaceous age which is different than the previous literature. Is it possible that the Abor Volcanic was emplaced during Indian subcontinent breakup event from Gondwana?
Regards
Upendra
When a continent breaks in two, that's not an event – it takes tens of millions of years, during all of which volcanism is expected.
The question was: "Is it possible that the Abor Volcanic was emplaced during Indian subcontinent breakup event from Gondwana?" Of course it is possible, because this "breakup event" wasn't an event, but a long period from the middle-or-so Jurassic through the Paleocene.
The sketch is weird because it shows subduction of ocean floor under India and Antarctica and in putting the Tethys in the wrong place (it was north of India, between India and Asia).
Dear Upendra,
I dont know your exact Abor sample location. The Abor displays multiple phases of volcanism. I am also working in this area since 2009, and completed my Ph.D thesis entitled "Petrography and Geochemistry of the Volcanic and Metavolcanic Rocks of Siang Valley, Arunachal Pradesh, India" in the year 2016. Where I have mention only two phases (other phases not reported due to some confusions) of volcanism of Palaeozoic and Mesozoic.
thank you all for your suggestions but still I am confused !!!
David Marjanović during the break up event the India was not its current shape, position and orientation, and in my knowledge it was E-W rifting ... later India rotated and formed the present orientation, so I proposed this idea.
Chaitra Dhar Taye , but my U-Pb data set shows Mid Mesozoic event and only a single grain was upper Cret. and still I am working on it
Jorge Costa-de-Moura I am learning your suggestion.
Dear Upendra Baral
what are minerals used for U-Pb dating from volcanic ash beds? In which laboratory you sent the samples for dating. i also would like to date the volcanic ash from NW Himalaya.
Dear Upendra. Where exactly in the Siang Valley area is the sample from? Regards, Jason
Prof. Jason R Ali
The samples are along the Siang river. In my hypothesis the Abor volcanic rocks were emplace during the time of Gondwana breakup.
I am working on it and hope to submit the work soon.
Regards
Upendra
Crustal blocks have been departing Gondwana for a very long period - " emplace(d) during the time of Gondwana breakup" is a very vague statement. If India is thought of as the "core" of Gondwana (the label is, I believe, derived from an Indian group of people/culture), breakup events have happened through the Paleozoic (mid-Early Paleozoic) through Mesozoic (end-Cretaceous - Seychelles). What specifically do you mean?
Regards Jason
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