How old are rocks in Ontario?
The Grenville Province makes up about 20 percent of the exposed Canadian Shield in Ontario and located south of Sudbury is 1.0 to 1.6 billion years old and is dominated by sedimentary rocks and later metamorphized. These rocks were metamorphosed between 990 million years ago and 1.08 billion years ago.
Why does Canada have the oldest rock?
The Original Crust
This recycling means that a vast majority of the earth’s original crust has been pushed deep beneath the crust, far from the grasp of geologists. The oldest crust that exists today is in the Canadian Shield and was thought to be formed about 2.7 billion years ago, until a recent discovery.
Is there obsidian in Ontario?
The obsidian found in Ontario is generally believed to have originated in Yellowstone Park, Wyoming. It was probably brought to Ontario in association with the Laurel Culture which is dated from 150 BC to AD 1100 in the vicinity of D1Kp-1 (Fig.
How old are Canadian Shield rocks?
The Canadian Shield contains some of the oldest rocks on Earth. In 2008, researchers estimated rock found on the northern shore of Hudson Bay, 40 km south of Inukjuak, to be 4.28 billion years old. Its age means the rock was created approximately 300million years after the formation of Earth.
Where are the youngest rocks on Earth found?
Scientists found that the youngest rocks are located at the mid-ocean ridges and the older rock is found far from mid-ocean ridges. This finding provided support for the Theory of Plate Tectonics.
Is zircon older than diamonds?
The papers posited that the diamonds formed, somehow, before the oldest zircons—that is, before 4.3 billion years ago—and then were recycled repeatedly over a period of 1.2 billion years during which they were periodically incorporated into the zircons by an unidentified process.
What rock collection dates back thousands of years?
Scientists may have just found the oldest intact Earth rock—on the moon. A study published Thursday in Earth and Planetary Science Letters makes the case that one of the rocks collected by Apollo 14 astronauts in 1971 contains a fragment of Earth’s ancient crust, dating back more than 4.011 billion years.