The acasta gneiss - northwest territories, canada among the oldest earth rocks discovered so far: 4 billion years old the age comes from radiometric dating using isotopes of uranium and lead and probably represents the timing of the metamorphism fig 8-23 geology 2nd ed. Deep time oldest rock a fist-sized sample from the acasta river, an obscure little drainage up near great bear lake, northwest territories, canada this was self-collected from what is the oldest known in-situ (or still in place) rock formation on the planet, clocking in at 403 billion years old postscript: further age-dating measurements have pushed parts of the acasta river locale back. Rock type(s): tonalite gneiss, mostly composed of quartz and feldspar photo source: wikipedia prior to the discovery of the nuvvuagittuq greenstone belt, the acasta gneiss was the oldest rock formation found on earth, the oldest parts of which date back to about 4031 billion years. The acasta gneiss is a rock outcrop of hadean tonalite gneiss in the slave craton in northwest territories, canada located on an island about 300 kilometres north of yellowknife , the acasta river rock deposit, believed to be 4031 to 358 billion years old, is the oldest known intact crustal fragment on earth. The acasta gneiss: oldest known rock located in the western slave province of canada’s northwest territories, this hadean-aged gneiss is the oldest known exposed rock in the world radiometric dating of zircon crystals has established the acasta gneiss at 403 billion years old.
Age of the earth earth as seen from apollo 17 consider the age of the earth to be around 455 billion years (455 × 109 years) this age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the acasta gneiss of northern canada may be the oldest known exposed crustal rock[7. Acasta gneiss's wiki: the acasta gneiss is a tonalite gneiss. U-th-pb dating of zircon from biotite gneiss in the watersmeet dome, n michigan, adds to the previous data base for early archaean core rocks in this structural dome that was rejuvenated late in. Acasta gneiss is the oldest exposed outcrop in the world and is found in the remote northwest territories of canada based on radiometric dating of the zircon crystals, the age of the outcrop had been formed just over four billion years ago.
Radiometric time scale gneiss samples from outcrops in the karelian area of eastern finland are believed to represent the oldest rocks in the baltic region acasta gneiss samples from great slave lake are some of the oldest rocks in north america. Unit 3 exam for science foundations study the oldest rocks found on earth come from the acasta gneiss in canada and have been dated using radiometric dating how old are they radiometric dating is based on the fact that radioactive elements decay from a parent isotope to a daughter isotope at a constant rate by measuring the ratio. Dating rocks and layers how do we date the rocks and layers to obtain the age of a fossil’s rock layer, geologists use two main methods: the relative dating and absolute dating techniques oceanic and atmospheric sciences at oregon state university, reported that the oldest rocks in north america are the acasta gneiss complex near. The rock exposed in the outcrop formed just over four billion (4 x 10 9) years ago an age based on radiometric dating of zircon crystals at 403 ga,  the acasta gneiss is important in establishing the early history of the continental crust. How old is the earth the age of the earth is 454 billion years (ga or gyr), a number which geologists have determined by several independent methods acasta gneiss, slave craton, canada (bowring and williams, 1999) science courseware has an excellent radiometric dating exercise called “virtual dating” that walks you through each.
Miner for a lode of iridium figure 4: a 5 cm specimen of gneiss from an outcrop of the acasta gneiss in northern canada this gneiss outcrop is dated at 402 billion years which is considered to be from one of the oldest outcrop of rocks on earth radiometric dating relies on the natural decay of radioactive isotopes it is a reliable. The acasta gneiss complex in northwestern canada contains some of the oldest dated rocks on earth and the oldest dated using u-pb in zircon they therefore potentially preserve clues to the nature and history of earth’s oldest crust the geology of the gneisses reflects a complex multistage. The oldest known rocks on earth are almost exactly 4 billion years old and are comprised of metamorphosed and deformed granitoids from northwestern canada collectively called the acasta gneiss direct radiometric dating using the u-pb method on zircons has demonstrated that these rocks crystallized 4030 million years ago.
The oldest known exposed rock outcrop found so far is that of the acasta gneiss in canada the acasta gneiss was dated by radiometric means at 42 billion years (42 ga) in age (tsuyoshi, 2007) and, i have a specimen of the acasta gneiss. • absolute age dating gives a number to the age – dave is 89 years old and steve is 12 radiometric dating – ash beds very useful due to the large areas they cover 4 apollo 11 - high-k basalt • acasta gneiss from the canadian shield (nw territories near great slave lake. Precambrian research 153 (2007) 179–208 geology and zircon geochronology of the acasta gneiss complex, northwestern canada: new constraints on its tectonothermal history. Gneiss is a high grade banded metamorphic formed by the deep burial and heating of its pre-existing parent rock this specimen the acasta gneiss from the nw territories of canada is the earth's.
Radiometric dating uses the ratio of parent to daughter isotopes in a sample to determine how much time has eleapsed since the sample formed a critical assumption is that either all of the daughter isotope was produced from the parent isotope. Joe jonas dating history 2016 mysore's exclusive joas and trading standards weary of online dating are hugged or submissive and returning back to jjonas end conclusion. Using radiometric dating, this rock – named for the nearby acasta river east of great bear lake – is said to have formed 4 billion years ago making it the oldest known intact piece of the earth’s crust.