An Historic Mega Event Such As The - amazonia.fiocruz.br

That interfere: An Historic Mega Event Such As The

An Historic Mega Event Such As The Video

The crater is estimated to be kilometers 93 miles in diameter [4] and 20 kilometers 12 miles in depth, well into the continental crust of the region of about 10—30 kilometers 6. It is the second largest confirmed impact structure on EarthMwga the only one whose peak ring is intact and directly accessible for scientific research.

Penfield was initially unable to obtain evidence that the geological feature was a crater and gave up his search. Later, through contact with Alan Hildebrand inPenfield obtained samples that suggested it was an impact feature. Evidence for the impact origin of the crater includes shocked quartz[7] a gravity anomalyand tektites in surrounding areas.

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Ina scientific drilling project drilled deep into the peak ring of the impact crater, hundreds of meters below the current sea floor, to obtain rock core samples from the impact itself. The discoveries were widely seen as confirming current theories related to both the crater impact and its effects.

He then obtained onshore gravity data from the s. According to Penfield, "The old data showed a large concentric set of onshore gravity anomalies.

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Tne I laid it next to my No. We recognized the crater as the likely Cretaceous-Paleogene boundary event. Pemex disallowed release of specific data but let Penfield and company official Antonio Camargo present their results at the Society of Exploration Geophysicists conference. Coincidentally, many experts in impact craters and the K—Pg Cretaceous—Paleogene boundary were attending a separate conference on Earth impacts.

Although Penfield had plenty of geophysical data sets, he had no rock cores or other physical evidence of an impact. He knew Pemex had drilled exploratory wells in the region.

Inone bored into what was described as a thick layer of andesite about 1. This layer could have resulted from the intense heat and pressure of an Earth impact, but at the time of the borings it was dismissed as a lava dome —a feature uncharacteristic of the region's geology. Penfield tried to secure site samples, but was told such samples had been lost or destroyed. At the same time, ingeologist Walter Alvarez and Suvh father, Nobel Prize-winning scientist Luis Walter Alvarezput forth their hypothesis that a large extraterrestrial body had struck Earth at the time of the Cretaceous—Paleogene boundary.

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Hildebrand and faculty adviser William V. Boynton published a draft Earth-impact theory and sought a candidate crater. InHouston Chronicle reporter Carlos Byars told Hildebrand of Penfield's earlier discovery of a possible impact crater. A team of California researchers including Kevin PopeAdriana Ocampoand Charles Duller, surveying regional satellite images infound a cenote sinkhole ring centered on Chicxulub that matched the Historid Penfield saw earlier; the cenotes were thought to be caused by subsidence of bolide -weakened lithostratigraphy around the impact crater wall.

The Chicxulub impactor had an estimated diameter of 11—81 kilometers 6.]