Zuurstofgehalte van aardse atmosfee

Zuurstofgehalte van aardse atmosfeer nam eerder toe dan gedacht
Het zuurstofgehalte van de atmosfeer van de aarde nam eerder toe dan tot nu toe werd aangenomen.
De aardse atmosfeer bestond 813 miljoen jaar geleden al voor ruim 10 procent uit zuurstof.

Voor het eerst is dat met een directe meting in oude gesteentes vastgesteld.

Dat melden onderzoekers van West Virginia University in het wetenschappelijk tijdschrift Geology.

Steenzout
De wetenschappers kwamen tot hun bevindingen door onderzoek te verrichten op het mineraal haliet, dat ook wel steenzout wordt genoemd. In deze gesteentes zitten vaak gasbelletjes die lucht uit vroegere tijden bevatten.

De onderzoekers brachten het zuurstofgehalte in kaart van luchtbelletjes in steenzout in het zuidwesten van Australië. De onderzochte mineralen ontstonden naar schatting 813 miljoen jaar geleden. De onderzochte luchtbellen uit deze tijd bevatten 10,9 procent zuurstof.

Tijdlijn
De ontdekking dat het zuurstofgehalte van de atmosfeer al zo vroeg een aanzienlijke hoeveelheid zuurstof bevatte, verandert volgens hoofdonderzoekster Kathleen Benison de atmosferische tijdlijn van de aarde.

Tot nu toe werd aangenomen dat het zuurstofniveau op aarde pas 550 miljoen jaar geleden flink steeg.

Benison benadrukt dan ook het belang van onderzoek op oude gesteentes om een beter beeld te krijgen van de prehistorische atmosfeer. "Veel omstandigheden uit het verleden zijn nog steeds terug te vinden in moderne afzettingen of gesteentes", verklaart ze op nieuwssite ScienceDaily.

De atmosfeer van de aarde bestaat op dit moment overigens voor ongeveer 21 procent uit zuurstof.

Kết quả (Anh) 1:

Oxygen content of Earth's atmosphere took increasing rather than thoughtThe oxygen content of Earth's atmosphere took increasing rather than so far was adopted. The terrestrial atmosphere existed already for more than 10% 813 million years ago from oxygen.For the first time is that with a direct measurement in old rocks.That report researchers at West Virginia University in the scientific journal Geology.Rock saltThe scientists came to their findings by research on the mineral halite, also known as rock salt. In these rocks are often gas bubbles that contain air from former times.The researchers brought the oxygen content in map of air bubbles in rock salt in the South West of Australia. The investigated minerals were formed approximately 813 million years ago. The examined air bubbles from this period contain 10.9 percent oxygen.TimelineThe discovery that the oxygen content of the atmosphere as early contained a significant amount of oxygen, changing according to main field of Kathleen Benison atmospheric timeline of the Earth. Until now it was assumed that the oxygen level on Earth increased considerably only 550 million years ago. Benison therefore stresses the importance of research on ancient rocks to get a better view of the prehistoric atmosphere. "Many circumstances from the past are still reflected in modern sediments or rocks," she explains on news site ScienceDaily.Earth's atmosphere consists, by the way, about 21 percent oxygen.

Kết quả (Anh) 2:

Oxygen content of Earth's atmosphere rose more than it expected
, the oxygen content of the atmosphere of the earth rose earlier than it had been assumed until now.
The Earth's atmosphere existed 813 million years ago to over 10 percent of oxygen.

For the first time that a direct measurement set in ancient rocks.

researchers at West Virginia University in the scientific journal Geology.

rock salt
the scientists arrived at their findings by carrying out research in the mineral halite, also known as rock salt. These rocks are often bubbles that contain air from the past.

The researchers brought the oxygen mapping of air bubbles in rock salt in southwestern Australia. The examined minerals originated an estimated 813 million years ago. The examined air bubbles from this time contain 10.9 percent oxygen.

Timeline
The discovery that the oxygen content of the atmosphere so early contained a considerable amount of oxygen, changes according to head researcher Kathleen Benison atmospheric timeline of the earth.

Until now, it was assumed that the oxygen levels on earth 550 million years ago only increased significantly.

Benison therefore stresses the importance of research on ancient rocks to get a better picture of the prehistoric atmosphere. "Many circumstances of the past are still found in modern sediments or rocks," she declares on news site Science Daily.

The currently Earth's atmosphere is incidentally about 21 percent oxygen.

Kết quả (Anh) 3:

oxygen content of earth"s atmosphere took earlier than expectedthe oxygen content of the atmosphere of the earth took earlier than hitherto supposed.the earth"s atmosphere was 813 million years ago to more than 10% oxygen.the first is a direct measurement set in ancient rocks.report of west virginia university researchers in the scientific journal geology.rock saltthe scientists came to their findings by research on the haliet mineral, also called rock salt. in these rocks often contain gas bubbles air from earlier times.the researchers took the map of oxygen bubbles in rock salt in the southwest of australia. the investigated minerals was estimated at 813 million years ago. the investigated bubbles from this time include 10.9% oxygen.timelinethe discovery that the oxygen in the atmosphere so early a considerable amount of oxygen contained, changes in atmospheric lead researcher kathleen benison timeline of the earth.until now it was assumed that the oxygen level on earth only 550 million years ago, big alley.benison stresses the importance of research on ancient rocks in order to gain a better understanding of the ancient atmosphere. " many circumstances in the past are still to be found in modern sediments or rocks ", explains them nieuwssite sciencedaily.the atmosphere of the earth at this time is approximately 21% oxygen.