Volcano use for dating accuracy

Posted by / 04-Oct-2019 10:27

This area in the geological record is called the (formerly known as the K-T boundary).

In the new paper, this team built on previous research they'd done pinpointing the date of the impact, which rocks collected in Montana suggested occurred 66,052,000 years ago, give or take 8,000 years.

They have also tackled the Deccan Traps dating conundrum before, in a 2015 investigation of Indian samples that showed that in at least one location, the eruptions happened within 50,000 years of the impact.

Now, the scientists have obtained similar dates from a total of 19 rocks found at other locations in the Deccan Traps.

"Either the Deccan eruptions did not play a role — which we think unlikely — or a lot of climate-modifying gases were erupted during the lowest volume pulse of the eruptions."There are many open questions with this research, though, particularly since .

And scientists have never been able to measure the output of a massive flood basalt eruption like the one at Deccan Traps in real time — the last such eruption finished about 15 million years ago, in the Pacific Northwest.)The second new study also complicates matters, calculating slightly different date estimates for the Deccan Traps eruption.

In this scenario the preparation and evacuation of several small communities would be easier and much less disruptive than a volcanic crisis situation facing the Seattle metropolitan area.

Here's what the standard narrative has been: If most of the Deccan Traps lava burst out before the impact, then the gases it generated could have caused global warming during the last 400,000 years of the Cretaceous.

In the study, University of California, Berkeley, scientists report the most precise and accurate dates yet for the intense volcanic eruptions in India that coincided with the worldwide extinction at the end of the Cretaceous Period, the so-called K-Pg boundary.

The million-year sequence of eruptions spewed lava flows for distances of at least 500 kilometers across the Indian continent, creating the so-called Deccan Traps flood basalts that in some places are nearly 2 kilometers thick.

Science yearns to discover a means to control or stop volcanic eruptions before they begin.

To date there have been no successful efforts to start, stop or reduce a volcanic eruption; however, the ideas exists and discussion is underway.

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Scientists have obtained more precise dates for the Deccan Traps volcanic lava flows, linking peak activity more closely to the asteroid or comet impact 66 million years ago and the coincident mass extinction.

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