HOME

TheInfoList



Click Here for Items Related To - Shuram excursion
OR:
Shuram excursion on:   [Wikipedia]   [Google]   [Amazon]

The Shuram excursion, or Shuram-Wonoka excursion, is a change in δ13C, or in the ratio of
carbon-13 Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. As one of the environmental isotopes, it makes up about 1.1% of all natural carbon on Earth. Detection by mass spectrometry A m ...
to
carbon-12 Carbon-12 (12C) is the most abundant of the two stable isotopes of carbon ( carbon-13 being the other), amounting to 98.93% of element carbon on Earth; its abundance is due to the triple-alpha process by which it is created in stars. Carbon-1 ...
, taking place during the Ediacaran Period. The exact time period of the excursion is debated among scholars, beginning around 573 Ma and ending around 562 or 551 Ma. It was first noticed in the Wonoka Formation in
South Australia South Australia (commonly abbreviated as SA) is a States and territories of Australia, state in the southern central part of Australia. With a total land area of , it is the fourth-largest of Australia's states and territories by area, which in ...
in 1990 and later in the Clemente Formation of
Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...
in 1992 and the Shuram Formation in
Oman Oman, officially the Sultanate of Oman, is a country located on the southeastern coast of the Arabian Peninsula in West Asia and the Middle East. It shares land borders with Saudi Arabia, the United Arab Emirates, and Yemen. Oman’s coastline ...
in 1993. It is the largest negative δ13C excursion in Earth history, and recovery took 50 million years, although the apparent magnitude of the excursion may be distorted due to meteoric water diagenesis. It is not known what caused the excursion. The Shuram excursion may have played a role in sparking the rise of animals that resulted later in the Cambrian explosion. The oxygen-consuming Ediacara biota experienced a radiation during the isotopic excursion as a response to the transient surplus of oxidants. Microbial blooms of oxygenic phototrophs regulated the recovery of the carbon cycle from the isotopic excursion.


References

{{Reflist Ediacaran Isotope excursions