{"product_id":"meteorite-impact-melt-idiwhaa-tonalitic-gneiss-oldest-rock-in-the-world-s941","title":"METEORITE IMPACT MELT, Idiwhaa Tonalitic Gneiss, Oldest Rock In the World S941","description":"\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003eIdiwhaa Tonalitic Gneiss\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan style=\"font-family: Arial;\" size=\"5\" face=\"Arial\"\u003eMeteorite Impact Melt\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e\"Oldest Rock In The World\"\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003eSliced and Polished on the front\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e   \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003eLate Hadean 4.2 Billions Years Old.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003eAcasta Gneiss complex, North Shore, \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eAcasta River Region,\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size: x-large;\" size=\"5\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e      Northwest Territories, \u003c\/span\u003e\u003c\/span\u003eCanada.\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003eWeight: 238 grams\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cdiv\u003e\u003cb\u003e\u003cspan style=\"font-size: x-large;\" size=\"5\"\u003eapproximately 10 x 11 x .9 cm \u003c\/span\u003e\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cb\u003e\u003cspan style=\"font-size: x-large;\" size=\"5\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cb\u003e\u003cspan style=\"font-size: x-large;\" size=\"5\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cstrong\u003eAn impact melt origin for Earth’s oldest known evolved rocks\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTim E. Johnson   1,2*, Nicholas J. Gardiner   1, Katarina Miljković1, Christopher J. Spencer1,  Christopher L. Kirkland   1, Phil A. Bland1 and Hugh Smithies   3\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eEarth’s oldest evolved (felsic) rocks, the 4.02-billion-year-old Idiwhaa gneisses of the Acasta Gneiss Complex, northwest Canada, have compositions that are distinct from the felsic rocks that typify Earth’s ancient continental nuclei, implying that they formed through a different process. Using phase equilibria and trace element modelling, we show that the Idiwhaa gneisses were produced by partial melting of iron-rich hydrated basaltic rocks (amphibolites) at very low pressures, equating to the uppermost ~3 km of a Hadean crust that was dominantly mafic in composition. The heat required for partial melting at such shallow levels is most easily explained through meteorite impacts. Hydrodynamic impact modelling shows not only that this scenario is physically plausible, but also that the region of shallow partial melting appropriate to formation of the Idiwhaa gneisses would have been widespread. Given the predicted high flux of meteorites in the late Hadean, impact melting may have been the predominant mechanism that generated Hadean felsic rocks.\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eShipping Information.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003ePostage extra as per Australia Post. We are happy to combine shipping, please send us a message if you wish to do so and we can provide you with a quote or it will be done automatically at checkout.\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003ePlease tick post, express or normal if you wish for your parcel to be posted, or you can pay and then pick up in our store at Devon Meadows.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003ePlease be aware of any import tax your country may have.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note the price is in your currency.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003e\u003cspan size=\"5\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e","brand":"Crystal World Exhibition Centre","offers":[{"title":"Default Title","offer_id":21162569695314,"sku":"S941","price":470.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2322\/9315\/products\/DSC__2022-05-16-13-06-333264.jpg?v=1652670683","url":"https:\/\/www.crystalworldsales.com\/products\/meteorite-impact-melt-idiwhaa-tonalitic-gneiss-oldest-rock-in-the-world-s941","provider":"Crystal World Exhibition Centre and Sales","version":"1.0","type":"link"}