label: approximate zircon or monazite isotopic age of intrusive rock in millions of years description: imageData: iVBORw0KGgoAAAANSUhEUgAAACIAAAAiCAYAAAA6RwvCAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAoUlEQVRYhe3OsQmDQACF4SfeQZB0mULQ5jaxcYEbwRHcSLcQG0cJaUyCOYuQ5pWeoIT3V696fOYTAs6QORrwSxBOEE4QThBOEE4Q7j8gYZ7Ds+tg8hymLJPDIPe6xtz3QJriNgzBOrcZEwV5jeN3LAve0wTr3OavKMi1bfFoGtiiwKWqYq7iIJn3SeZ9FGAXyJ4JwgnCCcIJwgnCCcKdBrICNbUeu6KYaq4AAAAASUVORK5CYII= contentType: image/png
label: approximate zircon or monazite isotopic age of thermotectonic metamorphic event in millions of years description: imageData: iVBORw0KGgoAAAANSUhEUgAAACIAAAAiCAYAAAA6RwvCAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAArklEQVRYhe3OsQnCQACF4Re9AwnYWYlCWkGbYJ8ZBMEBsoIL6Aru4AA6RUAUJxCcQKyiwZyVzStzgQR5/wA/nymdQxsyTQN+CcIJwgnCCcIJwgnC/QckL5w7nF+YDA1mYxM0BlntHjhecnQ7QLYZuDiylTFekNPtDQD4lMD1XiCObOWXF2S77GO9f2I6sljMez4rP0iahEGahF6AWiB1JggnCCcIJwgnCCcI1xrIF0avHlpKbcoPAAAAAElFTkSuQmCC contentType: image/png