Calculate a K-Ar date for a sample of biotite from a gneiss containing K2O =9.00 wt%, 40Ar=2.424 mg/g. Decay constants: le = 0.581 x10-10a-1; l = 5.543 x10-10a-1; atomic abundance of 40K = 0.01167%; atomic weights: K=39.098, O= 15.999, 40Ar =39.96. And assume no inherited 40Ar.

Calculate a K-Ar date for a sample of biotite from a gneiss containing K2O =9.00 wt%, 40Ar=2.424 mg/g. Decay constants: le = 0.581 x10-10a-1; l = 5.543 x10-10a-1; atomic abundance of 40K = 0.01167%; atomic weights: K=39.098, O= 15.999, 40Ar =39.96. And assume no inherited 40Ar.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter15: Molecular Luminescence Spectrometry

Section: Chapter Questions

Problem 15.12QAP: Equations for the chemiluminescence determination of SO2 are given on page 383. Derive an expression...

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Question

Calculate a K-Ar date for a sample of biotite from a gneiss containing K₂O =9.00 wt%, ⁴⁰Ar=2.424 mg/g. Decay constants: le = 0.581 x10^-10a^-1; l = 5.543 x10^-10a^-1; atomic abundance of ⁴⁰K = 0.01167%; atomic weights: K=39.098, O= 15.999, ⁴⁰Ar =39.96. And assume no inherited ⁴⁰Ar.

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