Скачать с ютуб The Key to Geologic Dating- How Do We Know The Rock's Initial Isotope Composition? GEO GIRL в хорошем качестве

The Key to Geologic Dating- How Do We Know The Rock's Initial Isotope Composition? GEO GIRL

When determining the age of a rock using radiometric dating, we assume the rock started off with 100% parent isotope and 0% daughter isotope... But how does this work? How do we know the rock starts off without any daughter isotopes? In todays video, I go through all the processes that govern radioactive (parent) isotope and radiogenic (daughter) isotope behavior in melts and high T and P conditions within Earth's interior. For the most part, diffusion allows the movement of these isotopes under these conditions, which allows the inclusion of parent isotopes in the crystallizing rock and the exclusion of daughter isotopes. But why this selectivity? How does the rock know what is parent and what is daughter isotope? The concept of compatible and incompatible elements helps with this one. Most parent isotopes are compatible elements, meaning they fit into the crystal structures of the minerals that we use for radiometric dating. Daughter isotopes, however, are incompatible, meaning they do not fit into these crystal structures. Thus, while parent isotopes are incoroporated into the rock, daughter isotopes are left in the melt, until a different mineral with a structure favorable for those isotopes crystallizes and incoroporates them. Then we just make sure we use the correct mineral and isotope combinations when using these dating techniques. Simple as that! ;) Hope you enjoy learning about this as much as I did! ;D References: Radiogenic Isotope Geochemistry: https://amzn.to/3QWHWHC Stable Isotope Geochemistry: https://amzn.to/3ud82gZ Essentials of Igneous Petrology by Ronald and Carol Frost: https://amzn.to/37Zs9AL Earth Materials by Cornelis Klein and Anthony Philpotts: https://amzn.to/3z5sCxe Earth System History: https://amzn.to/3v1Iy0G 0:00 What is an isotope? 2:32 How radiometric dating works 5:16 What rocks can be radiometrically dated? 6:08 What does ‘resetting’ mean? 7:11 How ‘resetting’ works 10:12 Not all isotope systems ‘reset’ 11:42 Different ‘resetting’ temperatures 13:38 Isotope + mineral selection is key 14:34 Problem w/initial daughter isotopes 15:07 Mineral/isotope selection helps minimize this 15:57 Loss/gain models helps minimize this 16:17 Isochrons helps minimize this 18:07 Multiple samples helps minimize this 19:14 Why daughter isotopes are ‘rejected’ during formation 22:11 Where do all the daughter isotopes go? 23:40 Correcting’ isotope data 25:09 Reliability of peer-reviewed journals 26:07 Repetition also helps GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, & donate to support the channel if you'd like!) Hey there, Earth enthusiast! Check my favorite Earth-friendly products: Bamboo toilet paper: https://shrsl.com/3cvku Bamboo paper towels: https://shrsl.com/3cvkw Compostable tableware: https://shrsl.com/3cvkz Compostable trash bags: https://shrsl.com/3cvl0 Bamboo cutlery + straw! : https://shrsl.com/3cwfl Eco-Friendly Tote (great for grocery shopping!): https://shrsl.com/3cwfp Reusable straws + cleaning brushes (my fav!): https://shrsl.com/3cwft Eco-friendly laundry detergent: https://shrsl.com/3cwgo Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2 (Just click link, press get started, take the free C footprint quiz, then choose how much you want to reduce your footprint by donating to the C sequestration projects they're funding!) Non-textbook books I recommend: Oxygen by D. Canfield: https://amzn.to/3gffbCL Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I Life on young planet by A. Knoll: https://amzn.to/2RBMpny Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2 Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb Oxygen by N. Lane: https://amzn.to/3z4FgwZ Alien Oceans by K. Hand: https://amzn.to/3clMx1l Life's Engines: https://amzn.to/3w1Nhke Tools I use as a geologist/teacher/student: Geology field notebook: https://amzn.to/3lb6dJf Geology rock hammer: https://amzn.to/3DZw8MA Geological compass: https://amzn.to/3hfbdLu Geological hand lens: https://amzn.to/3jXysM5 Camera: https://amzn.to/3l6fGRT Carbon-neutral pencil bag: https://shrsl.com/3cvjv Carbon-neutral backpack: https://shrsl.com/3cvkc Disclaimer: Links included in this description might be affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission, but there is no additional charge to you! Thank you for supporting my channel so I can continue to provide you with free content each week! And as always, let me know your topic suggestions in the comments down below!